Hunan Shizhuyuan tungsten- molybdenum- bismuth fluorite polymetallic ore, the main metal minerals of the ore are scheelite, wolframite, molybdenite and stibnite, and the ratio of scheelite to wolframite is 7:3. The cloth has a very fine particle size. When the grinding fineness is about 90%, the monomer dissociation degree of these minerals is about 95%. Most scheelite scheelite crystal as a solution, a third of scheelite to wolframite account generated, this part containing scheelite or wolframite inclusion with the living body, and due to containing iron, manganese Impurity and weak magnetic properties. The black tungsten ore is a tungsten-manganese ore. The inlaid state of the black tungsten ore is complicated, and the grain size is extremely uneven. Some of the black tungsten ore is replaced by scheelite, and some of the fine-grained black tungsten ore is fluorite. Type ore gangue minerals is very large, mainly calcite, quartz, feldspar, andradite, Grossular, hedenbergite, diopside, tremolite, sericite, lepidolite black and the like, wherein The calcium-rich and iron-rich gangue minerals such as calcite, calcite, black scale mica, sericite and chlorite are about 30%, which has a great interference with the sorting of tungsten. The following is a description of the black and white tungsten mixed flotation process and the black and white tungsten separation flotation process of the Shizhuyuan black and white tungsten mine:
The flow chart of the principle of mixed flotation process of Shizhuyuan black and white tungsten ore is shown in Figure 1.
The ore ore has a WO3 grade of 0.48%, a ratio of scheelite to wolframite of about 7:3, and when the ore is milled to -0.074mm for 90%, the highly selective chelate collectors GYB and CF are used for collection. agents, lead nitrate, sodium hexametaphosphate and sodium silicate or aluminum sulfate composition adjusting agent, a fatty acid as an auxiliary flotation collector mixed wolfram, the crude mixture enriched tungsten concentrate, high-grade ratio, low yield, It can effectively reduce the processing volume of heating selection and greatly improve the selection efficiency; the white tungsten heating selection uses the improved Petrov method to obtain 66.12% of the WO3 grade of the white tungsten concentrate, and the recovery rate is 54.49%. The use of chelating collectors and combination modifiers for tungsten fines flotation to recover fine-grained tungsten minerals yields a fine-grained tungsten recovery of 8.33% compared to conventional methods. The black tungsten concentrate WO3 grade is 52.61%, and the recovery rate is 21.95%. The core of the process is the use of high-efficiency selective chelation collector GYB and CF mixed flotation black and white tungsten, recovery of black tungsten fine mud, to solve the separation of the wolframite and scheelite and the separation of scheelite and calcium-containing gangue minerals. The world's problems have improved metal recovery and concentrate grades.
The black and white tungsten mixed concentrate obtained by black-and-white tungsten mixed flotation can achieve a tungsten recovery rate of 80%, but the recovery rate of tungsten fines dressing is low, only about 20%, and the total recovery of tungsten in the final concentrate is only 65%. This is because the black and white tungsten mixed concentrate is added with a large amount of water glass in the slurry with temperature greater than 90 °C when the white tungsten is heated and heated, so that the surface of the black tungsten ore is strongly inhibited, resulting in the white tungsten heating tailings. Fine-grained tungsten concentrates have low grade and recovery.
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