Sodium sulfide is a commonly used agent in the flotation of sulfide ore. Its main functions are as follows: (1) is an inhibitor of most sulfide minerals. When used in large amounts, it inhibits most of the sulfide ore. It inhibits descending order of sulfide ore is roughly: galena, sphalerite, yellow copper ore, bornite, blue copper, pyrite, chalcocite. Since molybdenum ore is naturally floatable, sodium sulfide cannot inhibit it. Using this, when flotation molybdenite is used, Na2S can be used to suppress other sulfide ore. (2) the vulcanizing agent is a colored metal oxide ores. Non-ferrous metal oxides cannot be directly collected by xanthate. However, if sodium sulfide and non-ferrous metal oxidized ore are added before the yellow medicine flotation, a film of sulfide ore can be produced on the surface of the mineral. The yellow medicine can be harvested. This effect of sodium sulfide is called vulcanization, that is, it can be used as a vulcanizing agent for non-ferrous metal oxide ore. After the action of white lead ore and sodium sulfide, the surface color changes from white to dark. After the action of malachite and sodium sulfide, the surface color changes from green to dark, indicating that after vulcanization, the sulfide surfaces of the two minerals are different from those of minerals. Then, you can use the yellow medicine to collect it. (3) It is the de-agent of the sulfide ore mixed concentrate. When the amount of sodium sulfide is large, the xanthate collector adsorbed on the mineral surface can be desorbed. Therefore, sodium sulfide can be used as a de-agent before separation of the concentrate. For example, before the separation of lead-zinc mixed concentrate or copper-lead mixed concentrate, the slurry can be concentrated, a large amount of sodium sulfide is added to remove the drug, and then washed, and fresh water is added again to adjust the slurry and then subjected to separation and flotation. In addition to the above three main functions, since sodium sulfide can form insoluble sulfide precipitates with many metal ions, sodium sulfide also has the effect of eliminating some ions harmful to flotation in the slurry.
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The role of sodium sulfide in the flotation of flotation machine