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　　 Typical inorganic inhibitors are water glass, fluorosilicate, sodium fluoride, sodium fluoride, sodium sulfide, sodium six acidic phosphorus. Waterglass used to suppress silicate mineral cassiterite flotation when it cassiterite, calcite, fluorite, barite, zircon, scheelite, galena, calcium tungsten and molybdenum ore, gypsum, boric acid salt, pyrochlore, titanium, iron ore, cinnabar, and sphene, etc. have different degrees of inhibition. Also water glass and sulfuric acid inhibited copper lead acetate activated quartz. Fluosilicic acid, sodium fluoride and sodium fluoride are potent inhibitors of the fluorine-containing mineral containing aluminum, often used in conjunction with styrene phosphonic acid. When flotation of fine cassiterite with sodium alkyl sulfate, A-22, and styrenephosphonic acid, Ca2+, Fe3+, etc. in the slurry can inhibit the cassiterite. In order to reduce this inhibition, a certain amount of sodium fluorosilicate is often added. In addition, sodium sulphide and sodium hexametaphosphate are also good inhibitors of sulphur flotation. Preferred organic inhibitors for flotation of cassiterite are sodium carboxymethyl cellulose, tributyl phosphate, naphthol sulfonic acid, high molecular weight oxalic acid, oxalic acid, straw cellulose, pyrogallol, calcium lignosulfonate. (GF), citric acid, lactic acid, tannin, starch, dextrin, tartaric acid, EDTA, and the like. GF is an organic inhibitor. It has a strong inhibitory effect on gangue minerals such as calcite and quartz. The dosage is generally 100-200g/t. In addition, GF, SR, and P86 are the best combination agents for Barry Tin fine mud.