Lead and zinc are one of the earlier metals extracted by humans from lead and zinc ores. Lead and zinc are widely used in fields such as electrical industry, mechanical industry, military industry, metallurgical industry, chemical industry, light industry, and pharmaceutical industry. In addition, lead metal has many uses in sectors such as nuclear industry and petroleum industry. There are 11 types of lead industrial minerals and 6 types of zinc industrial minerals in lead-zinc mines, with galena and sphalerite being the most important.
The chemical formula of galena is PbS, and its crystal structure is an equiaxed crystal system. Sulfur ions are tightly packed in cubic form, and lead ions are filled in all octahedral voids. The surface of fresh galena has hydrophobicity, while unoxidized galena is prone to flotation. After surface oxidation, its floatability decreases. Huangyao or Heiyao is a typical collector of galena. Huangyao undergoes chemical adsorption on the surface of galena, while Baiyao and Ethylenethiocarbamate are also commonly used collectors. Among them, butylammonium black medicine has a selective collector effect on galena. Dichromate is an effective inhibitor of galena, but its inhibitory effect decreases on galena activated by Cu2+. Galena inhibited by dichromate is difficult to activate and can only be activated by treating it with hydrochloric acid or sodium chloride in an acidic medium. Cyanides cannot inhibit the flotation of galena, while sodium sulfide is sensitive to the floatability of galena. The presence of excessive sulfur ions can inhibit the flotation of galena; Sulfur dioxide, sulfite and its salts, lime, zinc sulfate, or other agents can inhibit the flotation of galena.
Lead and zinc are one of the earlier metals extracted by humans from lead and zinc ores. Lead and zinc are widely used in fields such as electrical industry, mechanical industry, military industry, metallurgical industry, chemical industry, light industry, and pharmaceutical industry. In addition, lead metal has many uses in sectors such as nuclear industry and petroleum industry. There are 11 types of lead industrial minerals and 6 types of zinc industrial minerals in lead-zinc mines, with galena and sphalerite being the most important.
The chemical formula of galena is PbS, and its crystal structure is an equiaxed crystal system. Sulfur ions are tightly packed in cubic form, and lead ions are filled in all octahedral voids. The surface of fresh galena has hydrophobicity, while unoxidized galena is prone to flotation. After surface oxidation, its floatability decreases. Huangyao or Heiyao is a typical collector of galena. Huangyao undergoes chemical adsorption on the surface of galena, while Baiyao and Ethylenethiocarbamate are also commonly used collectors. Among them, butylammonium black medicine has a selective collector effect on galena. Dichromate is an effective inhibitor of galena, but its inhibitory effect decreases on galena activated by Cu2+. Galena inhibited by dichromate is difficult to activate and can only be activated by treating it with hydrochloric acid or sodium chloride in an acidic medium. Cyanides cannot inhibit the flotation of galena, while sodium sulfide is sensitive to the floatability of galena. The presence of excessive sulfur ions can inhibit the flotation of galena; Sulfur dioxide, sulfite and its salts, lime, zinc sulfate, or other agents can inhibit the flotation of galena.
Zinc sulfate can be used as an inhibitor of lead zinc flotation regulator
Zinc sulfate is a pure white crystal, easily soluble in water, and is an inhibitor of sphalerite. It usually has an inhibitory effect in alkaline slurry, and the higher the slurry pH, the more obvious its inhibitory effect. Zinc sulfate produces the following reactions in water:
ZnSO4=Zn2++SO42-
Zn2++2H20=Zn(OH)2+2H+
Zn(OH)2It is a zwitterionic compound that dissolves in acids to form salts
Zn(OH)2+H2S04=ZnSO4+2H2O In alkaline media, obtain HZnO2-和ZnO22-。They adsorb on minerals and enhance their surface hydrophilicity. Zn(OH)2+NaOH=NaHZnO2+H2O
Zn(OH)2+2NaOH=Na2ZnO2+2H2O
When zinc sulfate is used alone, its co inhibition effect is poor, and it is usually used in combination with cyanide, sodium sulfide, sulfite or thiosulfate, sodium carbonate, etc.
The combination of zinc sulfate and cyanide can enhance the inhibitory effect on sphalerite. The commonly used proportions are:
Cyanide: Zinc sulfate=1:2-5.
Now，CN-and Zn2+Forming colloids Zn(CN)2Sedimentation.
