The commonly used inhibitors in gold selection plants and their characteristics are as follows: Automatic Film Cutting Machine
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1. Lime is used to increase the pH of the slurry. Lime inhibition pyrite, which for flotation of gold-bearing ore is disadvantageous. When flotation of silver minerals, lime inhibits quartz and gangue. In most cases, lime and sulphide can inhibit copper galena.
2. Acids are used to lower the pH of the pulp. Used to activate copper minerals after inhibition of cyanide and ferrous sulfate.
3. Cyanide Suppresses zinc , copper and pyrite during preferential flotation. When gold is contained in the ore, it will cause the dissolution of gold and loss. The critical concentration of CN-ion (mg/L) is: chalcopyrite 177; copper blue 34; porphyrite 6.8; chalcopyrite 0.44; pyrite 0.1.
4. Zinc Sulfate An inhibitor of sphalerite, usually used in alkaline pulps. When used in combination with cyanide, sodium carbonate, sulfurous acid, sodium thiosulfate, sodium sulfide, etc., the inhibitory effect is better.
5. Sodium carbonate Suppresses pyrrhotite and precipitates heavy metals and alkaline earth metals to prevent their effects on the mineral surface. When the amount of carbonate is too large, the foam contains water and the recovery rate decreases.
6. Sulfuric acid and its salts and SO 2 gas are mainly used to inhibit pyrite and sphalerite. Used in conjunction with lime, pH5 ~ 7, SO 2, or with zinc sulfate, ferrous sulfate, ferric sulfate mix, inhibition galena, sphalerite, pyrite, chalcopyrite does not inhibit the only, or even the activation of chalcopyrite .
Sulfated sulphate and sodium metabisulfite can be used in place of sulfite to inhibit sphalerite and pyrite.
For sphalerite which is strongly activated by copper ions, the sulfite method is less effective. Zinc sulfate, sodium sulfide and cyanide can be added to enhance the inhibitory effect.
7. galena heavy chromate inhibitors also inhibit pyrite. It is mainly used for the suppression of lead and copper in the separation of copper and lead. In order to fully exert the inhibitory effect of the other party's lead ore, the stirring action takes up to 30 minutes to 1 hour. Activated galena activation requires extensive use of sodium sulfite, hydrochloric acid or ferrous sulfate.
8. Sodium sulfide A vulcanizing agent for oxidizing ore flotation, an inhibitor of sulfide minerals when sorting polymetallic ores. Excessively harmful when used as a vulcanizing agent. Sodium sulfide is often used in combination with inhibitors such as zinc sulfate and sulfite to inhibit various sulfide minerals.
9. The non-sulfide flotation silicate, sodium silicate are widely used to suppress silica, aluminum silicates and silicate minerals.
10. Starch is a high molecular sugar compound that is hydrolyzed to give a soluble dextrin. Commonly used to inhibit calcite , graphite , talc , iron oxide, carbon shale, etc.
11. Lignin is a high molecular sugar compound, and lignin is mainly used as an inhibitor of silicate minerals and rare earth minerals. The lignosulfonate can also be used as an inhibitor of hematite and as an inhibitor of chalcopyrite.
Water mills commonly use water glass, starch, and dextrin as gangue inhibitors commonly used in quartz veins containing gold ore. Used in selected operations to improve the quality of gold concentrate products. 