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以反浮选法分离细粒径硅钙质磷矿中的石英,获得的P2O5品位和回收率都比正浮选法高,其中P2O5回收率提高了大约40%.在烷基胺盐、醚胺盐和季铵盐三种阳离子捕收剂中,以烷基胺盐捕收剂的反浮选效果最佳,P2O5品位和石英去除率可分别提高到30%和60%以上.酸性介质比碱性介质更有利于提高硅钙质磷矿的品位,在碳酸盐脉石存在的情况下,酸性越强的环境越有利于反浮选分离石英.磷酸比硫酸能更好地调节体系的酸性和抑制磷酸盐矿物,且用量较少.优化的捕收剂用量为0.5～1kg.t-1.三种阳离子捕收剂都在矿石表面发生物理吸附,以烷基胺盐的吸附强度最大,所以其具有较好的浮选性能.
By reverse flotation separation of fine-grained silicon calcite phosphate rock, P2O5 grade and recovery obtained higher than the positive flotation method, which P2O5 recovery increased by about 40% in alkylamine salt, ether Amine salt and quaternary ammonium salt, the anti-flotation effect of alkylamine salt collector is the best, P2O5 grade and quartz removal rate can be increased to 30% and 60% Alkaline medium is more conducive to improve the grade of Si-Ca phosphate rock, in the presence of carbonate gangue, the more acidic the environment is more conducive to reverse-flotation separation of quartz. Phosphoric acid can better regulate the system than sulfuric acid Acidity and inhibition of phosphate minerals, and the dosage is less.The optimum amount of collector is 0.5 ~ 1kg.t-1.The three kinds of cationic collectors are physically adsorbed on the ore surface, the alkyl amine salt adsorption strength of the largest , So it has better flotation performance.