Wolframite and Scheelite Ore High Efficiency Flotation

In the mineral processing of tungsten minerals, single scheelite or wolframite recovery of tungsten concentrate is easy, but it is relatively difficult for tungsten ores in scheelite and wolframite ore bodies, mainly because the heavy magnetic separation is difficult to have good indicators in the recycling of fine-grained scheelite and wolframite, and therefore, Flotation is usually used in ore mixing.

(1) The floatation of metal ion complex is used as collector with the complex flotation process of wolframite. The flotation pH is 6~10, and the mixed concentrate of WO₃ grade more than 40% is obtained by a coarse and one fine two sweep.

(2) The mixed concentrate is transferred into the thickener, and the foam is dispersed by high pressure spray. The concentration of the bottom flow is 40 ~ 70% after concentration, and the mass of the suspended solid suspension is less than 0.1%.

(3) The underflow of the thickener is transferred into the agitator, and the fatty acid collector 1 ~ 2kg/t (raw ore), sodium sulfide 5 ~ 8kg/t (raw ore), caustic soda 1 ~ 2.5kg/t (raw ore), water glass 60 ~ 100kg/t (raw ore), and high speed and strong stirring at the rate of 800 ~ 1200r/min are used, and the time of pulping is 1~2H.

(4) The slurry is adjusted to the floatation machine for flotation separation. After a crude two passes through two sweeping operations, the foam product is a scheelite concentrate and the tailings are wolframite concentrate.

(5) The fourth step scheelite foam products were dephosphored with dilute hydrochloric acid and / or nitric acid stirring 1 ~ 2H, and then washed and dried to be qualified high quality scheelite concentrate, the mass percentage concentration of dilute hydrochloric acid or dilute nitric acid was 10 ~ 20%, and the dosage of dilute hydrochloric acid and / or dilute nitric acid on wolframite was 5 ~ 10L/t. Adding aluminum sulfate and / or sulfuric acid to destroy the dispersion of water glass to promote the rapid settlement of the wolframite, the filtration drying is the wolframite concentrate, and the amount of aluminum sulfate and / or sulfuric acid relative to the tungsten concentrate is 1 ~ 3kg/t.

Compared with the traditional strong magnetic separation process, the separation of wolframite and the high quality of the scheelite concentrate have solved the problems of the inclusion of wolfram in the product and the poor quality of scheelite concentrate.

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