羟肟酸纳米粒子捕收剂浮选白钨矿试验

Experimental Study on Floatation of Scheelite by Hydroxamic Acid Nanoparticle Collector

为实现微细粒白钨矿的有效回收,使用含有羟肟酸基团的羟肟酸纳米粒子(SAC)作为白钨矿捕收剂,通过浮选试验对比了SAC与水杨羟肟酸(SHA)对白钨矿及脉石矿物的浮选性能。试验结果表明:SAC对白钨矿的浮选回收率较SHA对白钨矿的浮选回收率高5.7个百分点,对方解石的浮选回收率较SHA对方解石的浮选回收率低4.0个百分点,对石英均无捕收作用。通过接触角和Zeta电位分析表明,SAC在白钨矿表面发生吸附,形成纳米级粗糙结构,与SAC的疏水性共同作用,提高了白钨矿表面的接触角,改善了白钨矿的疏水性。

In order to realize the effective recovery of micro-fine scheelite,hydroxamic acid nanopar⁃ticles(SAC)containing hydroxamic acid groups are used as scheelite collector.The flotation performance of SAC and salicylhydroxamic acid(SHA)on scheelite and gangue minerals is compared by flotation test.The results show that the flotation recovery rate of SAC for scheelite is 5.7 percentage points higher than that of SHA for scheelite,and the flotation recovery rate of SAC for calcite is 4.0 percentage points lower than that of SHA for calcite.SAC has no collecting effect on quartz.The contact angle and Zeta potential analysis show that SAC is adsorbed on the surface of scheelite to form a nano-scale rough structure,which works together with the hydrophobicity of SAC to increase the contact angle of the surface of scheelite and improve the hy⁃drophobicity of scheelite.