The project of Jinxin Molybdenum, located in Shuidi Town, Songshan District, Chifeng City, Inner Mongolia Province, China, is an Exploring & Processing mining joint enterprise with the capacity of 1000t/d, and is an EPC Project provided by Xinhai. This project started from June in 2005 to May in 2006, which spent 11 months.
After signed the contract, Xinhai technical team including geology, electric power, mining and so on, primarily did a lot of exploration on the mine, the surrounding terrain and physiognomy, especially on the condition of water and power supply. Inner Mongolia has a vast region with fewer population and less water. All of the explorations collected detailed information for Xinhai Mine Design Institutes.
As the technicians were doing the explorations, Xinhai Mine Design Institute did a sample test for Jinxin Molybdenum. This test drew a conclusion that Jinxin Molybdenum reserves the largest sulphur molybdenum in China. With the further test on the features of the ore, it got the test statistics about the chemical composition of the raw materials and mineral composition. (As following)
According to the test, Xinhai Beneficiation Institute designed a practicable solution with a high-efficiency recovery on the condition of exploring experiments and detail test. The way of two closed-circuit is adopted in crushing process. Two closed-circuit crushing was used in the process, and ore grinding adopted two closed-circuit cyclone to classify the ore particle size. Coarse ore was reground by one closed-circuit grinding. Floating focused on the way that both grinding and processing were carried in the same time. The ore was be selected by coarse crushing for one time and scavenging for two times in the primary flotation. And the coarse concentrate was be dealt with fine crushing for one time and scavenging for two times too. However, the coarse concentrate was selected for six times after the regrinding. The qualified molybdenum concentrate filtered by the thickeners reached 51.68%, and molybdenum recovery rate reached 96.40%. This is the design of mining process solution with the way of ore exploring of the adit chute and footwall shaft development and the method of the non-pillar sublevel caving.
The key point of the whole beneficiation solution is relay on the selection of flotation reagent. First of all, Jinxin molybdenum raw ore contains diopside, sericite, silicate, gangue, which are very easy to be sliming, and the fine slit adsorbing agents will seriously reduce the efficiency, increase the slurry viscosity. The fine slit adsorbing on the surface of molybdenite, forms a wrapping sheet, which affect the results of flotation. Therefore, Xinhai beneficiation Institute decides to add sodium silicate to overcome the impact of the slime. The additions reduce the viscosity of the slurry, and prevent the fine slit adsorbing onto the surface of the molybdenite, release the Molybdenite from the flocculating constituent. Whatsmore, the aim that improving the flotation process, and enhance the beneficiation indicators.
Xinhai Beneficiation Institute selected the most advanced imported Meizhou equipment for Jinxin Molybdenum. This equipment can get smaller particle size of the crushing ore, (reaching the aim of more crushing and less grinding) which contributes to reduce the cost of production.
JInxin Molybdenum started its plant, the whole solution was carried out smoothly. And the equipment were in well operating. The high operating rates ensures the efficiency of the work, which got the great praise and reputation of the clients.
The spiral classifier is one of the important mineral processing equipment, whose working principle is to classify the materials by using the difference in the settling speed of solid particles in the liquid. The classifying effect of the spiral classifier will directly affect the content of the qualified product in the returned sand, thus affecting the grinding efficiency of the grinding mill.
In the classifying process, the factors that affect the classifying effect of the spiral classifier mainly include the following three aspects: the feeding of the spiral classifier, the structure of the spiral classifier and the operation mode of the spiral classifier. Below, we will specifically analyze how these three factors affect the classifying effect of spiral classifier.
The larger mud content or the finer particle sizes in the feed are, the stronger slurry viscosity is, and the slower settling speed of ore particles in the slurry will be, thus the particle size of overflow products is coarse.
In this case, in order to obtain the required overflow fineness, the supplementary water can be appropriately increased to reduce the pulp concentration. If the amount of mud in the feed is small or the slurry has been deslimed, the slurry concentration should be increased appropriately to reduce the number of fine particles in the returned sand.
There are three main factors that affect the classifying efficiency of the spiral classifiers: the inclination angle of the groove, the height of the overflow weir and the rotation speed of the spiral.
The inclination angle of the groove affects the settling area of the classifier. But because the groove of the spiral classifier is fixed after the installation, the inclination angle of the groove should be adjusted to an appropriate angle. The installation angle of classifier equipment is generally between 16-18 is appropriate.
If the inclination angle is too large, the settlement area decreases, and the coarse material is easy to slide, the overflow particle size will be coarser, but the fine material in the returned sand will decrease accordingly. On the contrary, if the inclination angle is too small, the settlement area is large and the overflow particle size is fine, so the fine material in the returned sand will increase. Therefore, the inclination angle should be determined comprehensively according to the nature of materials, classifying fineness and other factors.
The common spiral classifiers mainly include high weir spiral classifier and submerged spiral classifier. The high weir spiral classifier is suitable for the classification of the coarse particle, and the particle size of classifying overflow is generally larger than 0.15mm. The submerged spiral classifier is suitable for the classification of fine particle, and the particle size of classifying overflow is generally less than 0.15mm. The common feature of both is that the height of overflow weir will affect the subsidence area. When the overflow weir is increased, the subsidence area is increased, the volume of the classifier is increased, but the overflow particle size is decreased. In general, the height of overflow weir is rarely changed once it is adjusted at the beginning of production. For high weir spiral classifiers, the height range of overflow weir is usually controlled in the range of 400-800mm, while the height range of overflow weir is generally between 930-2000mm for the submerged spiral classifiers.
In addition, the rotating speed of the spiral will directly affect the agitation degree of the liquid surface and the capacity of conveying sand return. In the production, the overflow fineness and the productivity of sand return must meet the requirements. The faster the rotating speed is, the higher the capacity of returning sand is, but the increasing agitation effect will make the coarse particle sizes in the overflow increase. In general, the rotating speed of the spiral should be controlled within the range of 1.5-10r/min.
The pulp concentration is an important regulating factor, which has a great influence on the overflow fineness of spiral classifiers in actual production. Decreasing the pulp concentration, the overflow particle size becomes smaller, and the concentration increases, the overflow particle size also becomes coarser. Therefore, keeping a certain overflow particle size under an appropriate concentration can obtain the ideal production index. The suitable concentration of critical separation size can be determined by the mineral processing test.
The feeding amount of the spiral classifier should keep even and stable, otherwise, it is easy to cause the unstable classifying concentration. The classifying fineness fluctuates frequently, which can affect the production index of the next operation.
To sum up, the classifying effect of the spiral classifier involves many aspects, including the feeding of the spiral classifier, the structure of the spiral classifier and the operation mode of the spiral classifier. The mineral processing equipment technical experts suggest: first, please choose the formal mineral processing equipment manufacturers to buy the spiral classifiers, which can ensure the quality of equipment; In addition, in the daily production, the spiral classifier operators must pay more attention to the running state of the spiral classifier, take appropriate measures after analyzing the abnormal situation for ensuring the smooth operation of the spiral classifiers and obtaining the good classifying effect.
High-efficiency agitation tank is mainly applied in slurry stirring before flotation, chemical and construction industry, cyanide chemical plant, sewage treatment plant, and coal plant etc.. The rotation of the impeller drives the flowing of the slurry, which makes the mineral grains and the reagents well.
AFC screw conveyors automatically move one or more powders, granules, flakes, and other materials in dust-tight, contained systems to streamline the material handling process, prevent contamination, and maximize return on investment, day-in and day-out. 24/7/365.
This screw conveyor automatically conveys powders, granules, blends, crystals, or flakes, in addition to a wide range of other materials from one point to another. Also known as a helix conveyor, spiral conveyor, or auger conveyor, the dust-tight system is often used for transferring bulk solids into overhead surge hoppers, and conveying dry materials from one processing point to another. Its known for moving powders and bulk solids efficiently, quietly, and without generating dust.
Handle and discharge bags up to 4,000 lbs in weight with the AFC Forklift Style Bulk Bag Unloader. Typical options include: automatic bag tensioner, pneumatic bag massager and dust-tight bag access housing.