The modified water glass is effective for the flotation process of molybdenum ore and tungsten ore, and can strongly inhibit the gangue minerals which have similar buoyancy with the target minerals, reduce the number of molybdenum selection operations, and greatly improve the selection efficiency.
By a pilot study of molybdenum ores, using a roughing, two selection process, efficient composite collector FM oil used as the main component of coal flotation collector as water glass as a dispersant, experimentally obtained The grade of molybdenum concentrate is 49.02% and the recovery rate is 88.53%.
A refractory molybdenum ore in Shaanxi has a high oxidation rate and serious muddy. Using a coarse two-sweep flotation process, kerosene was used as a collector, and pine oil was used as a foaming agent to obtain a crude concentrate containing 7.93%, with a recovery rate of 82.76%. Then, an appropriate amount of water glass was added as a dispersing agent in the ball mill to obtain a coarse concentrate containing 5.31% of molybdenum by sodium flotation-induced flotation, and the recovery rate was 85.53%, and the recovery rate was improved by 2.77% compared with the former.
When the material contains more mud, water glass is often used as a dispersing agent to improve the foaming phenomenon, in order to improve the grade of molybdenum concentrate. When the production of mud is high and the foam is sticky, it is effective to add water glass properly. Tests have shown that the amount of water glass has little effect on the aluminum selection index. Without addition of sodium silicate, 4.25% molybdenum concentrate grade crude, molybdenum recovery 89.65%; and after addition of water glass, copper and molybdenum concentrate concentrate filtration difficult. Therefore, in the case of a small amount of mud, it is not suitable to use water glass. However, in the closed circuit test, the amount of return of the medium mine will increase, which will bring more mud. Therefore, no water glass is added in the condition test, and a small amount of water glass can be added in the closed circuit test. In the closed circuit test, the amount of sodium sulfide is 15.5 kg/t, and the amount of water glass is 0.55 kg/t. When the copper-molybdenum mixed concentrate contains 17.85% copper and 0.251% molybdenum, the molybdenum concentrate grade is 46.77%, and the molybdenum recovery rate is obtained. 85.72% (including 0.205% copper), copper concentrate with a grade of 17.93% and a recovery rate of 99.995%.
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