黑钨渣硫酸浸钪及浸出过程中草黄铁矾法抑制铁浸出

Sulfuric Acid Leaching of Scandium from Black Tungsten Ore Slag and Depression Leaching of Iron by Carphosiderite Method

通过单因素实验考察了黑钨渣硫酸浸钪规律.结果表明,在温度90℃、酸渣质量比1.2:1、硫酸浓度29%(ω)、反应2.5 h条件下,钪浸出率达88%,铁浸出率为98%.在上述最佳浸出条件下通过调整反应过程料浆的酸度,探究了钪浸出和铁的草黄铁矾法抑制浸出规律.结果表明,在温度90℃、硫酸浓度29%(ω)、总硫酸加入量为1.0倍渣量(质量比)、一段加入0.8倍渣量的硫酸、反应2.0 h后加入剩余硫酸再反应0.5 h条件下,钪浸出率为87%,铁浸出率由98%降至57%,实现了铁抑制浸出.

The leaching of black tungsten slag with sulfuric acid is studied by single factor experiments.Under the optimum leaching conditions of temperature of 90 ℃,mass ratio of acid to slag of 1.2,concentration of sulfuric acid of 29% and leaching time of 2.5 h,the leaching rate of Sc and Fe is 88% and 97%,respectively.Under the above optimum conditions,the leaching rule of Sc and depressed leaching rate of Fe are explored by adjusting the acidity of slurry.Under the optimum leaching conditions of temperature of 90 ℃,mass ratio of acid to slag of 1.0,mass ratio of the first stage acid to slag of 0.8,the first stage of 2.0h and the second stage of 0.5 h,the leaching rate of Fe descends from 98% to 57%,showing its depression effect,with the leaching rate of Sc at 87%.