How to Get High-Grade Tungsten Concentrate?
Tungsten beneficiation method & enrichment machine
As kind of common metal, tungsten is usually mixed in kinds of rocks with its low content, and it can be smelted after beneficiation. There is wolframites and Scheelite and at this moment, wolframites has been in dominating place to explore, occupying over 90%. For tungsten enrichment, hand separation, heavy medium separation, gravity separation, floatation separation, magnetic separation and electrical separation has been involved.
For wolframite tungsten ore, it has characteristics of low content, low grade, coarse granule inlay, big density, low hardness, easy argillization, and dark color. Its beneficiation is mainly gravity separation. The density difference between wolframites and impurities is big and gravity separation can be adopted. But the wolframites granules shall be liberated from the impurities. So the promary situation is to observe the crystal granule size of wolframites. If the wolframites inlay is corse or it is lumpy wolframites, coarse mineral jig separator can be used directly to gain high grade tungsten ore. The equipment involved cover crusher, rod mill, jig concentrator. If it is fine granules inlay or wolframites mud, shaking table or centrifugal separator can be used.
But for scheelite tungsten ore, it is usually mixed with sulfide, mainly molybdenite, and the beneficiation for scheelite is floatation separation. In alkaline medium, The PH is 9-10.5 by sodium carbonate and sodium hydroxide. The main inhibitor is sodium silicate, quebracho sap, tannin, and kinds phosphate while the main collectors are oleic acid, sodium oleate, tall oil, paraffin soap oxide. These collectors owns foaming nature, so there is no need of foaming agent here. In order to improve the floatation efficiency of scheelite ore, polyvalent metalsalts can be added to the solium silicate while pulp temprature shall be up to 70-90 celsius degree. What's more.
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