Spiral chute is a kind of high-efficiency gravity separation equipment. It can be used in the materials such as iron ore, ilmenite, chromite, pyrite, zircon, rutile, monazite, tungsten, tin, tantalum, niobium, etc.
Spiral chute, integrated the characteristics of spiral concentrator, shaking table and centrifugal concentrator, is the best equipment for mining and beneficiation, especially for placer mining on seashores, riversides, sand beaches, and streams.
This equipment is suitable for the separation of iron ore, ilmenite, chromite, pyrite, zircon, rutile, monazite, phosphonite, tungsten ore, tin ore, strontium as well as antimony ore and other non-ferrous metals, rare metals and non-metallic mineral bodies with different specific gravity with a particle size of 0.3 - 0.02 mm.
The main part of the spiral chute device is the spiral flight which is made of glass fiber reinforced plastic. The inner surface of the spiral groove is coated with a wear-resistant lining, usually a polyurethane wear-resistant glue or an epoxy resin mixed with artificial gold steel sand.
There are a miner and a feed tank in the upper part of the spiral chute, and a product interceptor and a collecting tank in the lower part. The entire equipment is framed vertically with steel frames.
The spiral chute is similar to the thread shape. The movement of the materials inside can be divided into three stages, which are the material introduction stage, material acceleration phase and material uniform velocity warehouse phase. And the third stage lasts the longest, which is the key for materials crushing.
The key to the design of the spiral chute is in the uniform velocity stage. The main parameters are radius R, bottom plate width b, elevation height h, helix angle mouth, and bottom plate radial inclination angle.
Spiral chutes are widely used in the selection of hematite, the recovery of heavy minerals in tailings, and the selection of rare and non-ferrous metals. This is because it has the following advantages:
It has characteristics of reasonable structure, simple installation, small floor space, simple operation, stable ore dressing, clear mineralization, large processing capacity, high efficiency, high enrichment ratio, high recovery rate and reliable operation.
The spiral chute is not critical to the operation requirements (such as grain size, mass fraction, etc.). Even if the ore supply, ore concentration, ore size and ore grade change, there is almost no influence on the selection index, which means that it has strong adaptability.
The spiral chute is not only easy to operate, but also achieves a good treatment effect. It is characterized by stable ore dressing, clear ore separation, large processing capacity, high efficiency, and high enrichment ratio.
According to the difference in the specific gravity, particle size and shape of the ore, the ore and sand are separated by the gravity and centrifugal force of the swirling flow. The concentrate flows into the concentrate bucket. The tailings flow into the tailing bucket which is connected to the sand pool with the pipe and then they are discharged with the sand pump, completing the whole process of dressing.
The spiral chutes produced by Fote are mainly used in metal mines, coal industry, power environmental protection and other industries. They are sold well at home and abroad, and various types of equipment meet the needs of different industries.
Fote timely follows up product installation and maintenance. In the fierce market competition, relying on leading technical advantages, excellent product quality and perfect after-sales service, Fote's products are exported to more than 200 countries and area.
The gold content in the gold deposit is extremely low, and it is usually necessary to use refining by gravity separation, flotation, amalgamation, magnetic separation and electro-selection, and at the same time, high-efficiency and energy-saving gold ore beneficiation equipment are arranged for beneficiation and enrichment.
Crushing equipment: Jaw crusher. It is flexibly used for gold ore crushing according to different gold selection requirements, further improves gold mining efficiency and recovery rate, and reduces gold mine loss rate.
Washing: Some gold mines have a high mud content, and the soil is very sticky. It is easy to wrap the gold grains in the soil and cannot be extracted. Therefore, for such gold mines with more sticky soil, the first thing to do is the washing of the mine.
Screening: Cylinder washing machine. Because the gold in the gold deposit is free, the monomer dissociation degree of gold and sandstone is very high, and the large river pebbles are gold-free, thus it is necessary to screen the waste rock.
Rough selection equipment: Spiral chute. Gold mine after washing and sieving enters into rough re-election process. Gold mine with lower gold content generally adopts gold chute to raise gold which has a large processing capacity and low ore dressing cost.
Magnetic separation: Magnetic separator. Iron and ferrotitanium contained in gold deposits contain strong magnetism and weak magnetic properties. Different grades of iron concentrate and ferrotitanium powder can be obtained through different magnetic separators.
So far, the set of equipment has been running stably, which has brought considerable benefits to users. Because of its high quality and low price, reliable after-sales service and simple installation, it has attracted more customers.
As a leading mining machinery manufacturer and exporter in China, we are always here to provide you with high quality products and better services. Welcome to contact us through one of the following ways or visit our company and factories.
Based on the high quality and complete after-sales service, our products have been exported to more than 120 countries and regions. Fote Machinery has been the choice of more than 200,000 customers.
Lithium is an important strategic resource widely used in emerging fields such as batteries, ceramics, glass, aluminum, lubricants, refrigerants, nuclear industry and optoelectronics. It is an indispensable and important raw material for modern high-tech products.
Chile, China, and Argentina all have rich reserves of lithium, but they are all eclipsed by the Salar de Uyuni in Bolivia, South America. According to the US Geological Survey, the lithium reserves under the Uyuni salt marsh are staggering, accounting for almost half of the worlds lithium. If the lithium mine resources are fully developed, Bolivia, a poor South American country, will rival the Middle East giant Saudi Arabia.
From the perspective of the changes in the various uses of lithium in recent years, the battery has become the first largest application field in terms of the growth rate of lithium in other fields. At present, the global demand for lithium carbonate is around 140,000 tons. It is expected that the global demand for lithium carbonate will maintain an average annual growth rate of 15% to 20%, driven by the growth in demand for global consumer electronics and new energy vehicles. The annual consumption will reach more than 300,000 tons, and the proportion of new energy vehicles to lithium carbonate will increase from 9.7% in 2012 to 37.8% in 2018. If the global new energy vehicles, especially the pure electric vehicles represented by the US Tesla, grow faster, the global demand for lithium carbonate will reach 350,000 tons by 2010. As for the supply of lithium carbonate, there will be a gap in the supply and demand of global lithium carbonate by 2019.
The hand selection method is a sorting method based on the difference in color and appearance between lithium minerals and gangue minerals. The selective particle size is generally 10 to 25 mm, and the determination of the lower limit of the particle size depends on economic benefits. Hand selection is the earliest method of mineral processing used in the history of lithium mine production. In addition to spodumene, the hand selection is also used to pick lithium concentrates from lithionite, petalite, and amblygonite.
1 The positive flotation that is preferential flotation of spodumene, the working principle: ground fine ore in an alkaline medium formed by sodium hydroxide or sodium carbonate, after high concentration, strong agitation and multiple washing and de-sludge, the fatty acid or its soap is added as a collector to directly float the spodumene.
2 The reverse flotation process is to inhibit the spodumene in a lime-adjusted alkaline medium with dextrin and starch as a regulator, and use a cationic collector to float the silicate-like gangue mineral as a foam, and the product in the tank is It is a spodumene concentrate.
Hand selection and flotation are the main methods for selecting spodumene. Other methods such as thermal cracking, magnetic separation and gravity separation play an auxiliary role in the production of spodumene concentrate.
Working principle When the natural spodumene is about 1100 C, its crystals change from type to type, and at the same time, the volume expands and easily breaks into powder. Through grinding and screening producers, can achieve separation of spodumene and gangue minerals.
Since the difference in density between spodumene and associated gangue minerals is not large, gravity separation methods such as jigging, spiral beneficiation and shaker beneficiation are not suitable for the process of spodumene ore. However, heavy medium separation or heavy liquid beneficiation is an effective method for spodumene ore. Heavy medium separation method has been used in the production of lithium mines in South Dakota and North Carolina.
Magnetic separation is often used as an auxiliary method to improve the concentrate quality of spodumene. For example, the spodumene concentrate produced by the flotation of North Carolina, USA, is high in iron and can only be sold as a chemical grade concentrate. In order to meet the requirements of the ceramic industry, the plant uses magnetic separation to remove iron. In addition, since iron-lithium mica has weak magnetic properties, magnetic separation can be used as the main method for producing iron-lithium mica concentrate.
You can trust SGS to provide you with unparalleled global expertise in the field of grinding circuit design, optimization and production forecasting using tools such as the SAG Power Index (SPI) test.
Conducted in a bench-scale comminution mill, the SPI test measures the energy needed to perform a standard size reduction and is expressed as an index. It is a measure of the hardness of the ore from a SAG or AG milling perspective.
The test is a batch test, run with 2 kg of ore in a standard 10 cm diameter by 30 cm long mill, and it measures the time (in minutes) required to grind a sample from 80% passing 12.5 mm to 80% passing 1.70 mm.
The SPI test, in combination with Bond ball mill data, are used in the advancedComminution Economic Evaluation Tool (CEET) grinding simulation system for design, optimization, and production forecasting studies. The SPI has the advantage of requiring a low sample weight, and is therefore well suited for geometallurgical mapping of ore deposits
The SPI test has been widely used in recent years. Hundreds of deposits from a wide range of commodities have been tested and the results collated into an extensive database of hardness and variability profiles. SGS experts have conducted over 25,000 SPI tests on ore samples from deposits across the world.
SGS regularly conducts the SPI test in combination with other bench-scale tests and circuit simulation projects. The use of many methodologies provides you with a bankable solution that is unmatched in its rigor. Contact us to optimize the comminution design for your orebody and maximize your return.
* Dobby G, Kosick G, and Starkey J, Application of the Minnovex SAG Power Index Test at Five Canadian SAG Plants, in International Autogenous and Semiautogenous Grinding Technology 1996, Mular A.L., Barratt D.J., and Knight D.A., eds.,1996.
In Mineral Processing, the SPIRAL Classifier on the other hand is rotated through the ore. It doesnt lift out of the slurry but is revolved through it. The direction of rotation causes the slurry to be pulled up the inclined bed of the classifier in much the same manner as the rakes do. As it is revolved in the slurry the spiral is constantly moving the coarse backwards the fine material will flow over the top and be travelling fast enough to be able to work its way downwards to escape. The Variables of these two types of classifiers are The ANGLE of the inclined bed, this is normally a fixed angle the operator will not be able to adjust it.
The SPEED of the rakes or spirals, the DENSITY of the slurry, the TONNAGE throughput and finally the SETTLING RATE of the ore itself.To be effective all of these variables must be balanced. If the incline is too steep the flow of slurry will be too fast for the rakes or spirals to separate the ore. If the angle is too flat the settling rate will be too high and the classifier will over load. The discharge rate will be lower than the feed rate, in this case. The load on the rakes will continue to build until the weight is greater than the rake or spiral mechanism is able to move. This will cause the classifier to stop and is known as being SANDED UP. If the speed of the rakes or spirals are too fast, too much will be pulled, out the top. This will increase the feed to the mill and result in an overload in either the mill or classifier as the circuit tries to process the increased CIRCULATING LOAD.
The DENSITY of the slurry is very important, too high the settling will be hampered by too many solids. Each particle will support each other preventing the heavier material from quickly reaching the bottom of the slurry. This will not allow a separation to take place quickly. The speed at which the slurry will be travelling will be slow and that will hamper effective classification. Another variable is the TONNAGE. All equipment has a limit on the throughput that anyone is able to process, classifiers are no different. This and the other factors will have to be adjusted to compensate for the last variable, the ore itself. Every ore type has a different rate of settling. To be effective each of the previous variables will have to be adjusted to conform to each ones settling characteristics.
The design of these classifiers (rake, spiral, screw) have inherent problems, First, they are very susceptible to wear, caused by the scrubbing action of the ore, that plus all of the mechanical moving parts create many worn areas to contend with. The other problem that these classifiers have is that they are easily overloaded. An overloaded classifier can quickly deteriorate into a sanded-up classifier. Once that happens the results are lost operating time, spillage and a period of poor Mineral Processing and Separation performance.
Another mechanical classifier is the spiral classifier. The spiral classifier such as the Akins classifier consists of a semi-cylindrical trough (a trough that is semicircular in cross-section) inclined to the horizontal. The trough is provided with a slow-rotating spiral conveyor and a liquid overflow at the lower end. The spiral conveyor moves the solids which settle to the bottom upward toward the top of the trough.
The slurry is fed continuously near the middle of the trough. The slurry feed rate is so adjusted that fines do not have time to settle and are carried out with the overflow .liquid. Heavy particles have time to settle, they settle to the bottom of the trough and the spiral conveyor moves the settled solids upward along the floor of the trough toward the top of the trough/the sand product discharge chute.
Our Australian based head office houses the world's largest spiral manufacturing facility and produces over 20,000 starts annually. In 2010/11, we manufactured HC33 and WW6 spirals for ArcelorMittal's Mont Wright mining operations in Canada to deliver the largest single spiral order in our history.
Multotecs range ofmineral beneficiation equipmentdelivers a high-efficiency classification and separation solution. Mineral beneficiation equipment from Multotec utilises cyclones, magnetic separators, spiral concentrators and flotation components. Multotec has refined these solutions through over 40 years of equipment provision to the global mineral beneficiation industry reflecting continuousresearch and development.
Multotec partners with its clients over the plant process life cycle to ensure your mineral beneficiation goals are achieved with reduced capital costs and downtime resulting in the lowest possible cost per processed ton. With an extensive component inventory, Multotec can meet your mineral beneficiation requirements with a tailored, customised processing solution.
Hydrocyclones Utilising our extensive knowledge of the global mineral beneficiation industry, Multotec cyclones deliver enhanced beneficiation potential at lower running costs. Our scrolled evolute cyclone head design is industry-tested to enable a higher mineral beneficiation capacity.
Spiral Concentrators Through the use of gravity and no moving parts or power requirements, Multotec spiral concentrators deliver high-efficiency mineral and coal particle separation with low capital, operation and maintenance costs.
Magnetic Separators Magnetic beneficiation solutions from Multotec include wet and dry drums, high intensity separators and overbelt conveyor devices for the efficient extraction of ferrous content in process streams and loads.
Flotation Wear Components Froth filtration uses flotation for the processing, separation and classification of mineral particles. Multotec manufactures an array of wet and dry flotation wear components for all flotation cell types and sizes to optimise performance and lifespan, as needed by mineral beneficiation application.
Multotecs mineral beneficiation solutions are employed in some of the worlds biggest mining houses, with representation and authorised distributors on every continent. With a thorough knowledge of process flow sheets, Multotec ensures a seamless, compatible equipment integration in accordance with maximum beneficiation efficiency and productivity.