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Click to add WeChatTungsten is an important strategic metal mineral in my country. At present, the main mining methods are wolframite and scheelite. Most of the scheelites are complex minerals. , often associated or symbiotic with a variety of non-ferrous metal minerals such as molybdenum and bismuth, making the separation difficult; the raw ore grade of wolframite ore is relatively low, and the embedded particle size is relatively coarse. Gravity separation is often the main method of mineral processing. This article first focuses on the introduction of wolframite ore. The mineral processing process and scheelite mineral processing process are waiting for subsequent updates!
According to the properties and characteristics of wolframite ore, in the conventional mineral processing process, the ore process flow mainly including wolframite or wolframite ore mainly includesroughing, grinding, gravity separation, Let’s take a look at these five parts: selectionand fine mud treatment!
Generally, the rough separation of wolframite ore is mostly done by hand. This is an effective method for pre-enrichment of wolframite ore, and it is also an essential operation process in wolframite ore beneficiation operations. The rough separation of wolframite ore is to identify the wolframite ore from the raw ore with the naked eye, and use hands or hand tools to select qualified wolframite ore. There are forehand selection and backhand selection. The former is to select the wolframite ore in the mineral, and the latter is The waste rock is selected to leave wolframite ore.
Due to its brittle nature, tungsten ore is prone to over-crushing during the grinding process, which will produce too much In order to reduce the occurrence of secondary mud, the grinding stage is particularly important. At present, commonly used wolframite grinding operationsinclude one-stage grinding, one-stage rod mill + medium ore mill and two-stage grinding process, etc. The grinding equipment is Rod mill is mainly used. The use of rod mill can effectively avoid over-grinding and ensure the grinding particle size of the product. At the same time, it can meet the particle size requirements for subsequent selection. .
The wolframite gravity separation process is often usedMulti-stage jig-multi-stage shaker-fine mud centralized treatment processIn principle, the product after the first to second stages of grinding is put into three jigs, and then repeated through four to five shakers. After sorting, the fine mud obtained is processed centrally, and a large amount of tailings is discarded to obtain high-quality black tungsten concentrate; the coarse tailings after jigging are returned to the grinding system (rod mill) for re-grinding, and the ground product is screened once After separation, it is separated multiple times through a shaking table to obtain coarse and medium-grained concentrates respectively.
Black tungsten ore jigging and gravity separation:After the materials are screened by the vibrating screen, three grades of coarse, medium and fine mineral particles are obtained, and then fed into three groups of jigs respectively. Gravity separation is carried out in the jigging operation. The particle size range of coarse-grained jig processing is between 8-10mm; the particle size range of medium-grained jig processing is between 1.5-5.mm; the tailings obtained between the two operations need to be regrinded. select. The tailings obtained from fine-grained jigging need to be hydraulically classified, and then shaking table sorting. The shaking table tailings are the tailings for disposal. The tailing operation; and the concentrate obtained from the roughing jig operation can be sent to the concentration operation as the coarse concentrate in the gravity separation section for processing.
Wolftungsten ore shaker gravity separation:Generally suitable for processing medium and fine particles The selected particle size range of wolframite ore is between 0.037-2mm. In order to ensure the efficiency of wolframite shaker gravity separation, the narrower the selected particle size between each shaking table operation, the better. Therefore, when entering Before re-selection on the shaker, high-frequency screening or hydrocyclone can be used for pre-grading operations.
The beneficiation stage is a separation process after gravity separation of wolframite ore. Generally, after gravity separation, the wolframite coarse concentrate There are also high-value non-ferrous metals such as tin, molybdenum, bismuth, copper, and zinc or rare metals such as tantalum and niobium. High-quality wolframite concentrate with low content of other minerals needs to be selected through selection operations. The selection stage needs to be selected based on the mineral properties of the coarse concentrate after gravity separation. There are two methods: magnetic separation and flotation.
Magnetic separation process of black tungsten: Black tungsten coarse concentrate contains some magnetic minerals. Therefore, the grade of wolframite concentrate can be improved through magnetic separation. It can be used Dry magnetic separator has strong selectivity and can process particle sizes between 0.074-3mm. After magnetic separation, purer tungsten concentrate can be obtained ore, but the tailings contain high tungsten and require multiple sweeps.
Black tungsten concentrate roughing process:The main flotation method used in this stage is Taiwan flotation Method, that is, gravity separation and flotation operations are performed simultaneously on the same equipment (shaking table). In the coarse-grained state, the wolframite ore platform floatation method can achieve flotation separation of easily flotable sulfide and other minerals, and at the same time in the bed The surface separates minerals with different specific gravity.
Process of processing black tungsten ore fine mud. During operation, desulfurization operation is required first, and then the heavy-duty process is decided based on the mineral properties of the fine mud. Black tungsten is recovered through single or combined processes such as separation, flotation, magnetic and electric separation.
The above is the main process flow of wolframite ore beneficiation. In the actual beneficiation process, the process is only based on the preliminary design of conventional minerals. The final selection needs to be based on Ore beneficiation test analysis, design of suitable wolframite beneficiation process plan and reasonable wolframite beneficiation equipment a>, in order to effectively obtain high-quality black tungsten concentrate.
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