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借助工艺矿物学分析对常压富氧直接浸出条件下锌精矿中主要硫化物的浸出行为进行研究。结果表明,除黄铁矿外,其他硫化矿均会明显溶解。基于对浸出渣中单质硫与反应残余硫化物之间关系的分析,认为闪锌矿、黄铜矿、铜蓝、方铅矿的溶出可能遵循间接氧化方式,即硫化物首先酸溶,生成的H2S脱离矿物表面并迁移至溶液本体中进而氧化成单质硫。上述硫化矿的浸出过程可能受界面化学反应控制。对于磁黄铁矿的溶出,直接电化学氧化可能起主导作用,其浸出过程可能受产物层单质硫的扩散控制。
With the aid of process mineralogy, the leaching behavior of major sulfides in zinc concentrates under atmospheric pressure and oxygen leaching was studied. The results show that, in addition to pyrite, other sulfide ore will be significantly dissolved. Based on the analysis of the relationship between elemental sulfur in leaching residue and reaction residual sulfide, it is considered that the dissolution of sphalerite, chalcopyrite, copper blue and galena may follow the indirect oxidation mode, ie the sulfide is firstly acid-dissolved and formed H2S from the mineral surface and migrate to the bulk of the solution and then oxidized to elemental sulfur. The above sulfide ore leaching process may be controlled by the interface chemical reaction. For the dissolution of pyrrhotite, direct electrochemical oxidation may play a leading role, and the leaching process may be controlled by the diffusion of elemental sulfur in the product layer.