硝酸铅对水杨羟肟酸浮选锡石性能的影响

Effect of Lead on the Flotation Performance of Cassiterite by Salicylhydroxamic Acid

水杨羟肟酸是锡石浮选的常用药剂之一,能与碱土金属离子形成稳定性较小的螯合物。本文通过实验研究了硝酸铅的添加对水杨羟肟酸浮选锡石的性能影响,结果表明:硝酸铅和水杨羟肟酸预先混合再添加得到的浮选指标比顺序添加得到的浮选指标更好,且在pH值为7,硝酸铅和水杨羟肟酸的质量比为1:2.5,用量在700 g/t时,粗精矿锡石品位为3.13%,回收率为64.02%,该回收率比同等药剂用量条件下,硝酸铅和水杨羟肟酸按顺序添加提高了6个百分点。这可能是因为硝酸铅和水杨羟肟酸预先混合反应产生的金属有机配合物在浮选时表现出更强的捕收能力和选择性,从而提高了浮选指标。

Salicylhydroxamic acid is one of the commonly used reagents for the flotation of cassiterite.It can form a chelate with stability with lead ions.In this paper,the effect of lead nitrate on the flotation performance of cassiterite by salicylhydroxamic acid was studied.The results showed that the flotation index of pre-mixing of lead nitrate and salicylhydroxamic acid was better than those of sequential addition at pH 7.The optimum mass ratio of salicylhydroxamicacid and lead nitrate is 1:2.5,and the optimum dosage is 700g/t.The Sn grade of cassiteritein rough concentrate was 3.13%and the recovery was 64.02%.The recovery was about 6%higher than that of the same dosage of lead nitrate and salicylhydroxamic acid with sequential addition,which may attribute to metal-organic complex produced by the pre-mixed lead nitrate and salicylichydroxamic acid showed stronger collection and selectivity during flotation,thereby the flotation index is improved.