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Click to add WeChatPyrite is the main mineral resource for obtaining iron and sulfur. According to the different properties of its minerals, its beneficiation process is different, and the beneficiation equipment used is also different. This article takes a pyrite beneficiation case to introduce the pyrite beneficiation process process and commonly used beneficiation equipment.
Sulfur minerals are mainly pyrite (FeS2), containing a small amount of sulfate and trace amounts of monomeric sulfur minerals; iron minerals are mainly hematite. The main gangue minerals are silicate clay, followed by carbonate minerals and sulfate gypsum and anhydrite, and other minerals are distributed in small or trace amounts.
Through beneficiation test analysis, the process designed for this pyrite is a process of preferential flotation sulfur-tailings magnetic separation to recover iron. Its workshop consists of a crushing system, a grinding and flotation system, a magnetic separation system and a dehydration system.
The crushing adopts a three-stage one-closed-circuit process. The raw ore is fed into the first stage crusher for coarse crushing. After crushing, the material is screened. The screened material returns to the first stage for crushing, and the screened material enters the second stage for fine crushing. After fine crushing, the product is also screened. The screened material returns to the second stage for further crushing, and the screened material is qualified material (the final crushing product particle size is controlled at 12mm). There is a feeder to feed the grinding system. The pyrite equipment required for this link includes crusher and vibrating screen.
Crusher: The first stage of coarse crushing uses a jaw crusher, the second stage of medium crushing uses a standard cone crusher, and the third stage of fine crushing uses a short head cone crusher.
Screening machine: Use a circular vibrating screen.
The grinding adopts a two-stage closed-circuit process. The first stage ball mill and the hydrocyclone form a closed-circuit system, and the classification particle size is -200 mesh 60%. The second stage ball mill and the hydrocyclone also form a closed-circuit system, and the classification particle size is -200 mesh 90%. The pyrite beneficiation equipment required at this stage is ball mill and cyclone.
Ball mill:grid type ball mill as the first stage of coarse grinding, overflow type ball mill as the second stage of fine grinding.
Cyclone:Choose cyclone groups with different grading particle sizes respectively.
Flotation adopts one roughing, one sweeping and two fine operations. The intermediate ore is returned in sequence. The product is sulfur concentrate. The flotation tailings enter the magnetic separation iron separation operation. The pyrite beneficiation equipment required at this stage includes: flotation machine and stirring tank. In addition to the equipment, flotation agents are also used to assist in flotation.
Floatation machine: There are two types: mechanical stirring flotation machine and aerated stirring flotation machine.
Agitating tank: Ordinary agitating tank, high-efficiency agitating tank and reagent agitating tank.
Flotation reagent: Collector, inhibitor, etc.
The magnetic separation process adopts the strong magnetic-regrinding-strong magnetic separation process, and uses a strong magnetic separator to perform a one-rough and one-sweep strong magnetic separation operation. The magnetic separation comprehensive concentrate enters the three-stage closed-circuit grinding operation composed of a mill and a cyclone. The grinding fineness is -0.43mm and the mass fraction accounts for 83%. The overflow of the cyclone enters the second stage of one-rough and one-sweep strong magnetic separation operation, and the second stage of magnetic separation comprehensive concentrate enters the flotation operation for desulfurization. The product in the tank is a qualified iron concentrate. The pyrite equipment required for this link is: strong magnetic separator and weak magnetic separator.
Strong magnetic separator:SLon vertical ring pulsating high gradient magnetic separator.
Weak magnetic separator:Magnetic drum.
The concentrate dehydration process adopts two-stage dehydration of concentration + filtration. The flotation sulfur concentrate and the iron concentrate after magnetic separation are concentrated and filtered to obtain the final sulfur concentrate and iron concentrate; the tailings dehydration process adopts cyclone + concentrator + filter for dry dehydration, and the overflow water and filtered water are returned to the concentrator for recycling. The final moisture content is 15%~18%. The pyrite equipment required for this link includes: concentrator, cyclone, filter press, etc.
Concentrator: High-efficiency concentrator is used for concentrate dehydration, and deep cone concentrator is used for tailings dehydration.
Cyclone:Cyclone group is often used to complete tailings dehydration.
Filter press:Disc filter is responsible for completing concentrate dehydration, and chamber filter press is responsible for tailings dehydration.
The above is the pyrite beneficiation process plan and the beneficiation equipment used. In daily production, the properties of each pyrite ore are different. Therefore, when selecting the process and equipment, it should be determined according to the beneficiation test analysis to avoid waste of resources and investment costs.
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