SALIENT DATA OF ORE DRESSING INVESTIGATION CARRIED OUT BY OD DIVISION, IBM PROCESS. ADOPTED. 1. 59 Pilot Plant crushing and screening investigation on Bailadila Iron ore . 548 Crushing, Screening and scrubbing
Barite (barium sulphate) often occurs as large veins or beds, as gangue mineral in various mineral veins, in limestones, sandstones and like deposits. The ores are generally low grade and require concentration by flotation to meet market specifications.
Barite, which has the ability to influence other materials with its basic characteristics, makes this heavy spar indispensable in maintaining the high specifications and uniform viscosity needed in all rotary drilling fluids. TheBarite Beneficiation Process is one offlotation, it is used as an ingredient in heavy mud for oil-well drilling, for which purpose specifications demand a material meeting the drilling mud specifications.
Crush enough ore in 8 to 10 hours for 24-hour operation. The ore is dumped over a 10 grizzly ahead of the coarse ore bin to control size pieces handled by the crusher. The rugged 36x 10 Apron Ore Feeder, especially designed for the severe service under the feed hopper, has a variable speed drive for controlling the feed to the jaw crusher, thus assuring maximum crushing efficiency.
A 2 wide by 6 long Shaking Grizzly is operated from the eccentricity of the jaw crusher bumper. The grizzly set at a slope of 15-20 from horizontal saves headroom and with 1.5 clear openings eliminates the undersize; while oversize material goes to a 15 x 24 Jaw Crusher, which reduces the 10 pieces to approximately 1.5.
Crude ore is drawn from the fine ore bin by means of a 24 x 14 Adjustable Stroke Belt Ore Feeder and reduced to 100-150 mesh in a 6x12 Steel Head Ball Mill, charged with 3, 2.5, 2 and 1 diameter balls.
The ball mill discharge and spiral screen undersize is classified at approximately 100-150 mesh separation in a 48 x 26-9 Crossflow Classifier. The classifier sands are returned to the ball mill, while the overflow is pumped by a 3x3 SRL Rubber Lined Sand Pump to a 12 diameter Hydroclassifier for final separation ahead of flotation.
The coarse fraction settles, is raked to center discharge cone of hydroclassifier and removed with a 4 Duplex Adjustable Stroke Diaphragm Pump. (The adjustable feature on the classifier acts as a control on the size material overflow.) A restriction plate, in the hydroclassifier tank cone, disperses the added water which tends to eliminate the. fines or undersize fraction which might be mechanically trapped in the coarse size.
The coarse fraction hydroclassifier sands are metered to a 6x6 Steel Head Ball Mill charged with 1 diameter balls which give more efficient grinding on the fine feed. The ground fraction from the regrind mill is returned to Hydroclassifier with a SRL Sand Pump.
This two stage grinding affords added flexibility by controlling grind. Some ores require feed to conditioner to be thickened, which sometimes eliminates troublesome soluble salts and effectively controls the density of the pulp in the conditioner and flotation circuits. Flotation can sometimes be done at 40-50% solids without detriment; yet flotation at higher percent solids produces a more finished product in flotation cells, so this thickener is often included.
The hydroclassifier overflow, or thickener underflow is conditioned with necessary reagents for flotation. If caustic soda is not added in the ball mill, it is added with sodium carbonate to the conditioner for regulating pH from 8.0 to 10.0. Sodium silicate is sometimes added to liberate slimes; while the collector is usually a refined tall oil acid or similar product. It can be added to conditioner or in stages.
An 8-cell No. 21 Sub-A Flotation Machine, non-metallic flotation type, equipped with multi-bladed moulded rubber or neoprene impeller and diffuser wearing plates, produces rough flotation concentrates. These rougher concentrates are further upgraded by two stages of cleaning. Each stage consists of 3-cells of the 6-cell No. 21 (38 x 38) Sub-A Flotation Machine. In the rougher cells the pulp level in each cell can be controlled either by wood weir blocks or hand wheel operated weir gates. The flotation tailings are sampled by a Automatic Sampler fitted with a wet type cutter. The tailings are then pumped by means of a SRL Pump to the tailings pond.
A 5 x 5 SRL Sand Pump elevates the final flotation concentrates to the 30 x 10 Spiral Rake Thickener; the thickener underflow is reused in the flotation circuit. The thickened product is filtered on a 6 x 6-disc Disc Filter.
A 9x 10 Screw Conveyor feeds the filtered product to the 5 x 50 Countercurrent Dryer with dust collection system. The dried product from the dryers is moved to the Chain Type Bucket Elevator by means of an enclosed screw feeder, and discharged into a dust tight surge bin for a bagging machine; or into a storage bin for loading hopper cars.
The flowsheet in this study is for a plant to treat economically 100 tons per 24 hours of ore containing approximately 37% barite, 37% fluorspar and 1.5% zinc as sphalerite and to yield marketable concentrates of barite, assaying in excess of 95% BaSO4, and acid grade fluorspar. The close association of the minerals and their similar response to the reagents require careful testwork to determine the exact reagents and treatment process. Overgrinding must be avoided.
The flowsheet incorporates standard equipment for both low cost and operating service. Units illustrated are for a specific tonnage but illustrate a typical flowsheet. The crushing section operates only 1 shift per day.
For the average mine up to 100 tons per day, primary crushing is usually sufficient. Since over 90% of the operating problems of a jaw crusher come from the bumper bearings, an all anti-friction bearing crusher has been selected. Larger tonnagesrequire primary and secondary crushing sections for maximum efficiency in size reduction for subsequent grinding operations. The grizzly ahead of the crusher provides greater crushing capacity since the undersize material by-passes the crusher.
The ore for treatment is of such a nature that conventional grinding to 65 mesh using a ball mill classifier circuit results in excessive overgrinding of the barite. To avoid this condition a rod mill is used instead of a ball mill for reducing the feed for flotation. This circuit, consisting of a combination of spiral classifier and cyclone, actually results in a slight undergrinding of the fluorspar but this does not prove detrimental in the coarse flotation circuit. Reagents for zinc flotation are added to the grinding circuit and the pulp is then conditioned to obtain maximum contact of the reagents for effective activation of the sphalerite.
The classifier overflow at approximately 30% solids is subjected to rougher flotation in a Sub-A Selective Flotation Machine, followed by multiple cleaning of the rougher concentrate. Cell-to-cell Sub-A Flotation Machines are best for this service. The tailing from the zinc flotation section is pumped to a thickener which overflows the collodial slimes to waste. The thickened pulp is metered to barite conditioning and flotation. The discarding of collodial clay slimes, if present in the ore, is necessary to prevent excessive reagent consumption. The thickening operation also provides for uniform feed rates to the barite section.
The zinc tailings thickener underflow, at approximately 40% solids, is conditioned with barium chloride and citric acid in the first conditioner, and a barite frother and collector is added in the second conditioner. A Super Agitators and Conditioners with standpipes around the shaft provide for pulp recirculation and prevent froth buildup in the conditioner tanks. A fairly lengthy conditioning period is required to obtain the maximum effect of the reagents. The barite rougher flotation is rapid and the addition of a small amount of reagent towards the end of the circuit assures ample froth for the scavenger operation. The rougher concentrate is cleaned three times, using plenty of clean spray water to cleanse the froth and obtain satisfactory slime rejection. The barite tailing is pumped to a thickener to density the pulp to approximately 40% solids for fluorspar conditioning and flotation.
The underflow from the barite tailings thickener is metered at 40% solids to the first of two conditioners where a depressant and sodium silicate are added for gangue depression. Fluorspar collectors are added to the pulp in the second conditioner. The conditioned pulp is subjected to rougher flotation followed by multiple cleaning of the rougher concentrate.
The fluorspar and barite flotation concentrates do not present any difficulties in thickening and filtration. The thickeners are of sufficient capacity to handle the tonnage and to provide some concentrate space in the event of minor filter or dryer interruptions. Froth retaining overflow launders and sprays are desirable on the thickener tanks. The small amount of zinc in the ore does not warrant thickening prior to filtration; instead, a filter with sufficient area for filtering the concentrates direct from the flotation machines is used. The zinc and barite concentrates are filtered, using a Disc Filters and the fluorspar by a drum type Fluorspar Filter with stainless steel filter media.
The filtered zinc concentrates drop directly into a concentrate bin. The barite and fluorspar concentrates from the filters pass to rotary dryers which are provided with dust collecting systems. The dry concentrates are then conveyed to air tight surge bins for bagging or storage silos for loading into hopper cars.
The recoveries of base metals, barite and fluorspar in acceptable products varies with the type ore and degree of association of the various components in the ore. Coarse mineralization with minimum amounts of slime will generally result in higher recoveries. The reagents and conditions for treating ores of this nature can be determined only by batch or pilot plant testing programs.
Most of the barite produced by flotation is used as an ingredient in heavy mud for oil-well drilling, for which purpose specifications demand a material with minimum specific gravity of 4.30. When sold for production of lithopone and barium chemicals, lump or jig concentrate with minimum BaS04 of 95 per cent and maximum Fe2O3 of 1.0 per cent is specified.
When sold for drilling mud ingredient, the barite needs to be ground to less than 5.0 per cent plus 325 mesh, which requirement necessitates either grinding the crude ore to this fineness before flotation or regrinding the concentrate produced at a coarser initial grind. Gravity concentration is sometimes advantageous in conjunction with flotation, as by this means products may be obtained that will meet the requirements of more than one market. Some of the anionic reagents commonly used to float the barite are detrimental to its use as drilling mud and must be removed from the particle surfaces by heat during the drying stage.
Barite is readily floatable by fatty acids in an alkaline pulp, usually oleic acid with soda ash or caustic soda. Sulphonated petroleum products are also satisfactory. The trend in development of new reagents is to overcome the need to heat the concentrate to a high temperature to remove the reagent.
Any discussion of barite mining is virtually. impossible without considering, almost in the same breath, the many other variables, such as beneficiation, transportation, infrastructure and location that impact the economics of a particular barite orebody. My comments will be limited to just the mining aspects of barite orebodies and these observations must be considered in proper context with all other parameters affecting exploitation of a barite property prior to final decision on economic feasibility. In many instances low-cost mining situations are more than offset by high-cost beneficiation requirements. Likewise, there are cases of relatively high-cost mining associated with no or low-cost beneficiation requirements thus permitting economic exploitation.
Barite orebodies and occurrences are almost as varied as the number of occurrences. As in most mining situations, the design of a mine plan and implementation of a proper exploitation program must be approached on a case by case basis. Proper and sufficient geologic control of a barite orebody must precede the development of a mine plan.
Generally speaking, barite orebodies can and, at many times, do strange things; pinch with depth; almost never increase in size with depth, overturn, fault-off, change grade, etc. Due to the extreme variable nature of most barite orebodies, a mine plan and its implementation must be as flexible as possible. The ability to quickly adapt to variable conditions will greatly enhance the economics within a particular barite mining environment.
Although a significant quantity of the worlds barite production comes from underground mines, the worlds largest producing barite mines are surface mines. Virtually 100% of current barite production in the United States and Canada is from high productivity surface mines. Generally speaking, only in those areas of the world that have an abundance of low cost labor is the exploitation of barite by underground mining feasible at todays economics.
Two of the largest underground barite mines in the world were located in North America. Both were shut down in the early seventies with appreciable reserves remaining at depth. The costs associated with underground mining of barite attributable to the much lower productivities of underground mining relative to surface mining dictated the closure of these two mines prior to the depletion of reserves.
Open pit mining of barite orebodies is generally no different than most other open pit mining environments. As in all other sectors of the mining industry, the increasing costs of labor and the decreasing trend in productivities will dictate the use of ever larger and more productive mining equipment.
Just 10 years ago 4 cu-yd. loaders and 20-25 ton trucks were the largest sizes commonly employed by barite producers. D8s were generally the largest dozers used. Today 35-40 ton trucks with 7-8 cu.yd. loaders are common.
Generally speaking, most barite orebodies amenable to open pit methods are of the size where flexibility of equipment employed is of prime importance. It is common practice to use the same equipment for both stripping and mining, thus permitting much greater flexibility in day-to-day operations, generally better equipment utilization, and commonly lower equipment acquisition and maintenance costs.
Stripping ratios of surface barite mines are increasing and the movement of large volumes of overburden are becoming more and more critical to the overall economics of an operation. One could initially conclude that the higher efficiency of scrappers, draglines, or shovels for overburden removal and truck-loader combinations for the mining phase would be the most economic approach. In practice, most barite orebodies do not lend themselves to complete separation of the stripping and mining functions. Most barite orebodies are not amenable to using scrappers, draglines or large shovels for the actual mining phase and the ore must be selectively mined at least to the extent that larger stripping equipment would create unacceptable mining dilution. Likewise, many barite orebodies do not lend themselves to continuous, simultaneous mining and stripping. The flexibility afforded by truck-loader configurations generally outweighs the loss of productivity over scrappers. Most barite orebodies lend themselves best to cycles of mining, stripping, mining, etc. , and together with market, weather, and geological conditions, the flexibility of readily switching from mining to stripping or back to mining generally provides the best possible utilization of manpower and equipment.
As the higher grade, larger barite orebodies become depleted, deeper lower grade orebodies will naturally be exploited, and the prime consideration in mining will become the removal of larger volumes of material at the least possible cost. Selective mining reduces productivities in any given situation. The greater the degree of this selectivity the lower are resultant productivities and resultant costs can escalate rapidly. The trend now and in the future will be to less selectivity in mining with consequent improvement and enlargement of the beneficiation sector to offset the increased dilution from mining. The key to low cost mining and stripping is volume; the greatest amount of material moved in the least amount of time. Increased equipment size with its inherent increased productivities coupled with improved, larger crushing and beneficiation facilities will become the norm in the mining of large barite orebodies.
As alluded to earlier, the large underground barite mines at Malvern, Arkansas and Walton, Nova Scotia were most unique. Most barite orebodies do not occur in sufficient size or grade to permit underground mining with methods that lend themselves to high productivity mining techniques. Both the Malvern and Walton orebodies were exceptions. Both were multimillion ton orebodies of sufficient tonnage and dimension to permit exploitation by highly productive mining methods.
Unfortunately, the vast majority of barite occurs in narrow veins of varying degrees of strike and dip and lend themselves only to mining by lower-productivity, narrow-vein-type mining systems. Fortunately most barite ore-bodies are competent and occur in relatively competent geologic environments. The author is familiar with attempts to undercut and block-cave barite, but the extreme competency of the barite prevented natural caving even after massive undercutting of the ore zone. Open storing and shrink-stoping methods are commonly employed, and technical problems are generally no more complicated than encountered in most other narrow vein mines. Competency of the ore-body, hanging and footwall, together with mine water will be the most important considerations. Extensive support systems and the handling of appreciable water volumes will obviously seriously impact mining costs. Narrow vein barite mines are not large producers. One of the most common problems in narrow vein systems is under-development.
Mining volumes are in direct proportion to the number of people that can be efficiently employed within a mine. Consequently, the number of working faces available within a mine system relates directly to the capacity of that system. Generally speaking, it can and normally does take up to or over a year from primary development of a stope to final ore extraction in a shrink-stoping operation.
Annual production is dependent on the number of stopes that can be developed, mined and pulled in a year. Generally narrow vein barite mines are not or cannot be developed to the level required for large volumes. Unless multiple working faces are created by multiple level development within the same or closely associated vein systems, sufficient stopes cannot be developed to allow continuous, high volume production. Under-development creates periods of low production during development cycles, followed by spurts of production when stopes are mined and pulled, again to be followed by low production periods when the mine again has to catch-up with development. This can create havoc with costs not only in mining but in all phases of the operation through marketing.
Exploitation of narrow vein barite orebodies by underground mining methods are common and practical in countries with lower cost labor. Even so, mining costs are the significant factor as most orebodies currently being mined are of sufficient quality to require little or no beneficiation and resultant costs are competitive. Many of these mines are being forced to improve productivities and have remained competitive only by virtue of conversion to the more productive trackless systems employing large, fast, rubber-tired underground equipment. Narrow-vein underground mining of barite requiring extensive beneficiation in order to produce marketable quality material would in most cases be prohibitive at todays economics.
The single most important factor associated with the development and mining of a barite orebody is people. Generally speaking, approximately 50A of the cost of barite mining is labor cost. Naturally, this will vary but is generally a workable rule of thumb. Not only is the direct cost of labor important but, in certain situations, the indirect costs of labor become virtually prohibitive. A certain percentage of the labor force in all mining situations must be skilled and in the more remote locations of the world the costs of labor can become one of the most important factors in the economics of a barite property. Unlike the ferrous and non-ferrous metals industry, barite mines are extremely small in comparison (the largest in the world are commonly less than 500,000 tons per year capacity) and infrastructure costs of housing and facilities can become prohibitive.
The recent proliferation of governmental regulatory interference in all phases of industry are impacting costs in all areas. Safety, environmental, and permitting regulations on both the federal and state levels are significantly lowering productivities of barite mining. As barite mines are small in comparison to most mines, the impact of recent training regulations and punative fines on the part of MSHA will have a greater effect on unit costs of production. The days of throwing together a small producing unit at nominal cost have just about had it. With stringent noise, dust, safety, training and permitting regulations, the costs of getting in to production are much greater, the reserves must be sufficient to justify the initial capital and preproduction development costs and production volumes must be large enough to offset, on a unit cost basis, the impact of the recent proliferation of zero-productivity cost impacts.
NMDC Ltd will be installing a 24 X 7 Conveyor Belt Monitoring System for its Downhill Tunnel Conveyor no. 29 at Bailadila Iron Ore Mines in Bacheli Complex of Bastar region, officials informed. The company had recorded production of 9.64 million tonnes (provisional) of iron ore from its Chhattisgarh mines as on October 30, 2018, it had informed in a regulatory filing. Compared to this, the company had recorded production of 7.50 million tonnes (provisional) of iron ore from its Chhattisgarh mines as on September 30, 2018. The company had recorded iron ore production of 6.17 million tonnes (provisional) (MT) from its mines in Chhattisgarh as on August 31, 2018, the company had earlier informed in a regulatory filing. It had reported iron ore production (provisional) of 5.50 million tonnes (MT) from its mines in Chhattisgarh as on July 31, 2018 and had recorded iron ore production of 4.78 million tonnes (MT) (provisional) from its mines in Chhattisgarh as on June 30, 2018. It is targetting to achieve 10 million tonnes of iron ore production per annum from each of its mines in Chhattisgarh by 2024-25, official sources informed. NMDC has also acquired environment clearance for its proposed Beneficiation plant at Bacheli in Bastar region of Chhattisgarh, official sources informed. Notably, NMDC's Ore Processing Plant at Bacheli will be interconnected by a Slurry Pipeline System between Bacheli and Nagarnar in Chhattisgarh, they informed. The company which is also in the process of laying a 15 Million Tonnes Per Annum (MTPA) slurry pipeline is executing the project in two phases. The first phase is being executed from Bacheli to Nagarnar in Bastar region at an estimated outlay of Rs 4,000 crore; and the second phase will be executed from Nagarnar to Vizag in Andhra Pradesh at an outlay of Rs 6,000 crore, officials informed. Notably, to transport pellet feed concentrate from Bailadila to Vizag via Jagdalpur, the company will have the pipeline laid along the highways with a provision of partial off-take to feed its proposed 3 MTPA Steel plant coming up at Nagarnar. NMDC is operating iron ore mines at Bailadila Complex in South Bastar Dantewada District Chhattisgarh. It is having long term commitment for supply of iron ore to major steel plants across the country. NMDC, which is in the process of laying a 15 Million Tonnes Per Annum (MTPA) slurry pipeline is executing the project in two phases. The first phase is being executed from Bacheli to Nagarnar in Bastar region of Chhattisgarh at an estimated outlay of Rs 4,000 crore; and the second phase will be executed from Nagarnar to Vizag in Andhra Pradesh at an outlay of Rs 6,000 crore, officials informed. Notably, to transport pellet feed concentrate from Bailadila to Vizag via Jagdalpur, the company will have the pipeline laid along the highways with a provision of partial off-take to feed its proposed 3 MTPA Steel plant coming up at Nagarnar. The blast furnace to be used for manufacturing steel at NMDC Ltds upcoming 3 MTPA Steel Plant at Nagarnar in Bastar region of Chhattisgarh could also emerge as one of Indias largest when commissioned at the plant, officials stated. The company has commenced work for setting up the 2.0 MTPA Pellet Plant at Nagarnar near Jagdalpur in Bastar region of Chhattisgarh, officials informed. Notably, the company has made a capital expenditure of Rs 4.76 crore as on September 2016 for development of its Bailadila iron ore mines in Bastar region of Chhattisgarh during the financial year 2015-16, officials informed. It may also be recalled that NMDC has proposed to use its mine lease area at Deposit number 4 located at Bailadila range of hills at Bhansi near Bacheli in South Bastars Dantewada district in Chhattisgarh for meeting the raw material requirement 'exclusively' for its upcoming 3 MTPA Integrated Steel Plant at Nagarnar, officials informed.
It had reported iron ore production (provisional) of 5.50 million tonnes (MT) from its mines in Chhattisgarh as on July 31, 2018 and had recorded iron ore production of 4.78 million tonnes (MT) (provisional) from its mines in Chhattisgarh as on June 30, 2018.
The first phase is being executed from Bacheli to Nagarnar in Bastar region at an estimated outlay of Rs 4,000 crore; and the second phase will be executed from Nagarnar to Vizag in Andhra Pradesh at an outlay of Rs 6,000 crore, officials informed.
Notably, to transport pellet feed concentrate from Bailadila to Vizag via Jagdalpur, the company will have the pipeline laid along the highways with a provision of partial off-take to feed its proposed 3 MTPA Steel plant coming up at Nagarnar.
NMDC is operating iron ore mines at Bailadila Complex in South Bastar Dantewada District Chhattisgarh. It is having long term commitment for supply of iron ore to major steel plants across the country.
The first phase is being executed from Bacheli to Nagarnar in Bastar region of Chhattisgarh at an estimated outlay of Rs 4,000 crore; and the second phase will be executed from Nagarnar to Vizag in Andhra Pradesh at an outlay of Rs 6,000 crore, officials informed.
Notably, to transport pellet feed concentrate from Bailadila to Vizag via Jagdalpur, the company will have the pipeline laid along the highways with a provision of partial off-take to feed its proposed 3 MTPA Steel plant coming up at Nagarnar.
The blast furnace to be used for manufacturing steel at NMDC Ltds upcoming 3 MTPA Steel Plant at Nagarnar in Bastar region of Chhattisgarh could also emerge as one of Indias largest when commissioned at the plant, officials stated.
Notably, the company has made a capital expenditure of Rs 4.76 crore as on September 2016 for development of its Bailadila iron ore mines in Bastar region of Chhattisgarh during the financial year 2015-16, officials informed.
It may also be recalled that NMDC has proposed to use its mine lease area at Deposit number 4 located at Bailadila range of hills at Bhansi near Bacheli in South Bastars Dantewada district in Chhattisgarh for meeting the raw material requirement 'exclusively' for its upcoming 3 MTPA Integrated Steel Plant at Nagarnar, officials informed.
Taking deep research on the features, extraction methods, and fluorite mining machines have a significant positive effect on running the fluorite processing plant successfully. In the following paragraphs, I have made a detailed introduction from fluorite mineral attribute to extraction methods and machines and listed 2 cases for your reference.
Fluorite (also called fluorspar) is a mineral that common in nature, consists mainly of calcium fluoride( CaF2), can be symbiotic with many other minerals. More in wiki https://baike.baidu.com/item/%E8%90%A4%E7%9F%B3/258531?fromtitle=%E8%90%A4%E7%9F%B3%E7%9F%BF&fromid=8815755&fr=aladdin
Just as is the case with almost ore processing and non-metal beneficiation, the concentrate fluorite is extracted by crushing, sieving, grinding, grading, flotation, filtration, drying, etc. How to realize the high-efficiency sorting of associated fluorite ore is a real problem in the fluorite beneficiation process. Therefore, based on the characteristics of the associated fluorite ore, summarized the beneficiation method and floating agent of the types of associated fluorite ore. We, the JXSC mining machine factory, would be delightful provide you with the flotation machines.
The separation of quartz and fluorite achieved by grinding, it is an important factor affecting the flotation of quartz-type fluorite. The ground ore of a coarse size indicates that may have many associated fluorite ore lumps, these lumps may increase the silica content, decrease the flotation effect. If the grinding particle size is too fine, although quartz and fluorite have been dissociated from the monomer, it will cause the fluorite losing easily, thus reduce the recovery rate of fluorite.
In order to dissociate the fluorite from the quartz and not to pulverize the fluorite, the stage grinding process is generally used, which can reduce the silicon content in the fluorite concentrate after flotation and increase the fluorite recovery rate.
The results show that under the same conditions of grinding fineness, the fluorite concentrate by rod mill obtains a lower Si O2 content. Compared with ball milling, the particle size of rod grinding is more uniform, rod mill control the grinding fineness better.
In order to solve the difficulties in the separation of high calcium quartz fluorite ore, researchers did a great time of experiment. Studies have shown, the fluorite beneficiation effect of 97.21% concentrate grade and 69.04% recovery rate can be obtained when the condition of -0.074 mm grain taking 83.62% percentage, flotation 6 times, the PH value of slurry is 9-10YN-12 as the capture agent, sodium silicate, tannic and the Calgon as the inhibitors. When the PH value is 6, the sodium oleate has a significant effect on the recovery of pure fluorite minerals during the flotation process. However, when the slurry contains fine-grained quartz ore, the performance of sodium oleate to capture fluorite decreases. The capture ability of the oleic acid gradually improved by adding the sodium hexametaphosphate to disperse the quartz and fluorite. In a word, fine-grained quartz type fluorite ore is better to adopt the stage grinding process method to get the best size. Besides, it is best to use Na2CO3 to adjust PH value, choose oleic acid, oxidized paraffin, sodium silicate as a combination of collector and inhibitor.
Calcite type fluorite ore mainly consists of fluorite, and calcite( more than 30%). Since both calcite and fluorite are calcium-containing minerals, they have similar surface physicochemical properties. When coexisting in solution, they are prone to the mutual transformation between minerals, making separation of the two difficult to achieve.
Fatty acid collectors can float both of calcite and fluorite, therefore, it is needed to adjust the PH value of slurry. Practice shows that the PH value has a great impact on the flotation. When the PH value in the range of 8-9.5the fatty acid collectors can display function both of the fluorite and calcite. But in the weak acidic medium, the calcite has a lower floatability. Although it is difficult to separate calcite and fluorite by flotation, we still have chance to realize it by adjusting the PH value, choosing suited inhibitor(sodium silicate, salinization sodium silicate, acidification sodium silicate, Calgon, lignin sulfonate, dextrin,tannin, etc.), and using oleic acid as the trapping agent.
The barite type fluoride ore mainly consists of barite(10%-40%) and fluoride, also associated with iron pyrite, gelenite, sphalerite, and other sulfide minerals. It is not easy to separate the barite and fluoride because of the similar floatability. In general, the flotation process of the barite type fluoride ore is divided into two steps, one is combination flotation that obtains the combination of concentrate both of barite and fluorite, another is flotation that separation the barite and the fluorite from the combination concentrate.
Flotation of the first step: Na2CO3 as the conditioner of PH value, oleic acid as the capture agent, and sodium silicate as the inhibitor. Flotation of the second step has two ways: 1 Inhibiting barite and floating fluorite: inhibitors have lignin sulfonate, sodium silicate, NAF, dextrin, aluminum salt, ferric salts; captor has oleic acid. 2 Inhibiting fluorite and floating barite: adjusting the PH value the slurry to strong alkalinity by the sodium hydrate, using the citric acid, barium chloride, ammonium salt, sodium silicate as the inhibitors, and using the oleic acid or sodium alkyl sulfate as the collector.
The mineral composition of sulfide-type fluorite is similar to that of quartz type fluorite, but the content of the metal mineral is higher than that of the quartz type, and sometimes, the content of lead and zinc can reach the industrial grade. Therefore, it is necessary to take the recovery of the other metal mineral into considered. Usually, adopt the captor for sulfide minerals to select the metal sulfide minerals preferentially, then use the captor of fatty acid to recover the fluorite from the flotation tailings. In addition, roasting, leaching, and other processes can also help to extract valuable metals and to decompose fluorite.
A great deal of research and production practice shows that flotation is a useful method for recovering fluorite ores, suit for large scale fluorite ore processing, the beneficiation method( flotation process and chemical agent) varies from the ore characteristics. if you need a fluorite ore flotation machine, pls contact us.
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