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Tungsten is widely used in cemented carbide, steel and special alloys, lighting industry, chemical industry, petrochemical industry, and high-tech fields. As the tungsten market demand becomes stronger, the recovery rate needs to be increased to meet market needs. At present, the tungsten minerals with economic value for mining mainly include wolframite and scheelite. This article mainly introduces you to the mineral processing process of wolframite ore.
Wolframite ore has the characteristics of low raw ore grade, complex mineral composition, and difficulty in sorting. The main mineral processing process of wolframite ore based on wolframite ore consists of four parts: (1) crushing and discarding waste rock in advance to obtain qualified ore ( 2) Gravity separation and discarded tailings to obtain coarse concentrate (3) Selective separation and comprehensive recovery of coarse concentrate to obtain concentrate (4) Fine mud treatment.
The pre-enrichment process can improve the quality of raw ore and discard waste rock that is much lower than the grade of gravity separation tailings. Since waste rock is a difficult-to-grind material, discarding it in advance can save water, electricity and raw material consumption, and reduce mineral processing costs to a certain extent.
Due to the high density of wolframite, gravity separation can be used to process it. The gravity selection method has the advantages of low cost and environmental protection.
The principle process of tungsten ore gravity separation is generally: one-stage or two-stage grinding, three-stage jig separation, four-stage or five-stage shaking table separation, and centralized processing of fine mud to obtain coarse concentrate. The coarse and medium-sized jig tailings enter the rod mill for re-grinding, and then enter the vibrating screen for screening, forming a closed loop. The dressing plant generally uses a two-stage shaking table for separation, and the coarse and medium-grained ore obtained is returned to the circulation loop, and the slime is processed separately.
If the tungsten concentrate contains more impurities, the performance of tungsten steel and tungsten metal will be greatly affected. Therefore, these associated minerals are harmful impurities to the concentrate, but some metals are also useful minerals. Therefore, the crude concentrate needs to be carefully selected to remove impurities as much as possible and separate the useful minerals into individual products. The beneficiation operation plays an important role in improving the quality of the concentrate and the comprehensive utilization of useful components.
Due to its brittleness and high density, tungsten ore will stay in the mine longer than other gangue minerals, so it is prone to over-crushing. The primary sludge and secondary sludge produced during the mineral processing process contain many valuable elements, so it is necessary to comprehensively recover the useful components. Since the composition of fine mud is relatively complex, combined beneficiation processes are often used, such as: desulfurization-centrifuge-tungsten flotation-magnetic separation, magnetic separation-gravity separation-flotation, centrifuge-flotation, etc.
The above is a brief introduction to the four-step mineral processing process of wolframite ore. The specific process design and equipment configuration should be designed according to the production requirements of the mineral processing plant and the characteristics of the ore.
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