锌浸出渣协同浸出液气相硫化深度净化

Deep Purification of Zinc Leaching Residue Synergistic Leaching Solution by Gas Phase Sulfidation

在赤铁矿法炼锌工业中,锌浸出渣锌精矿协同浸出液中的Fe ^(3+)、As将极大影响赤铁矿的品质。以锌浸出渣协同浸出液为原料,采用气相硫化的方法,在高酸条件下,完成溶液Fe ^(3+)、As的脱除,并使锌、Fe ^(2+)完整地保留在溶液中。考察了温度、硫化气体通入量、通入速度等对净化效果的影响。结果表明,在硫化气体为理论通入量的1.2倍,通入速度<0.3 L min,反应温度80℃的条件下反应,砷的脱除率达95.26%,Fe ^(3+)的还原率达到接近100%,铜的脱除率达99.91%,而锌及Fe ^(2+)则完整地保留在溶液中。过程产生的硫化渣量很少,含铜可达30%以上,无需二次处理可直接搭入铜精矿中。

In the hematite zinc smelting industry,Fe^(3+)and As in zinc concentrate synergistic leaching solution of zinc leaching residue will greatly affect the quality of hematite.Applying zinc leaching residue synergistic leaching solution as the raw materials,and the method of gas phase sulfurization was used to complete removal of Fe^(3+)and As from the solution under high acid conditions and keep zinc and Fe^(2+)intact in the solution.The effects of temperature,amount and velocity of sulfide gas on purification effect were investigated.The results show that arsenic removal rate is 95.26%,Fe^(3+)reduction rate is close to 100%,copper removal rate is 99.91%,and zinc and Fe^(2+)are completely retained in the solution under the conditions including sulfide gas of 1.2 times of the theoretical amount,flow rate of<0.3 L min,and reaction temperature of 80℃.The amount of sulfurized slag generated in the process is small,and the copper content can reach more than 30%.It can be directly added into the copper concentrate without secondary treatment.