锌精矿与锌浸渣协同浸出及氧化转化行为

Simultaneous leaching of zinc residue and zinc concentrate and oxidative conversion behavior

锌精矿与锌浸渣协同浸出过程中利用Fe^(3+)与锌精矿发生氧化还原反应,实现锌精矿与锌浸渣的同步溶解,且缓解溶液中高浓度Fe^(3+)对锌浸渣溶解的抑制作用。对渣矿协同浸出的矿物溶解行为进行研究,同时也以单一矿物锌精矿为研究对象,研究了其在H_2SO_4-Fe_2(SO_4)_3体系中的氧化转化行为。结果表明:渣矿协同浸出能有效提高有价金属的浸出率,且浸出液中Fe^(3+)含量较低,便于后续处理;根据XRD、SEM和XPS分析,锌精矿在氧化转化过程中不断溶解,锌精矿中的硫主要被氧化成单质硫进入渣中,且单质硫在矿物颗粒表面形成包裹,使其溶解不充分。

Based on the redox reaction of Fe^3+and zinc concentrate,the method of the simultaneous leaching of zinc concentrate and zinc residue was proposed.The method achieved the dissolution of the zinc concentrate and the zinc residue,and also relieved the inhibitory effect of high concentration Fe^3+on the dissolution of zinc residue.The dissolution behavior of simultaneous leaching was studied,at the same time,taking zinc concentrate as the research object,the oxidative conversion behavior in H2SO4-Fe2(SO4)3 system was also studied.The results show that the simultaneous leaching process can effectively increase the leaching rate of valuable metals,and the content of Fe^3+in the leachate is low,which is convenient for subsequent treatment.According to the XRD,SEM and XPS analyses,zinc concentrate is continuously dissolved during the process of oxidative conversion.The sulphur of zinc concentrate is mainly oxidated into the elemental sulfur entered the residue.The elemental sulfur forms a wrap on the surface of the mineral particles,which results the zinc concentrate cannot fully dissolve.