锌中性浸出渣还原浸出工艺研究

以锌中性浸出渣为研究对象，针对硫化锌精矿还原浸出与SO2还原浸出工艺开展了实验研究并分析了两种工艺的特点。在还原浸出过程中随着铁酸锌的不断溶解，大量的Fe3+进入溶液导致溶液电位升高，抑制了铁酸锌的分解。通过还原浸出的方法能够有效缓解溶液中高电位对铁酸锌分解的影响从而提高金属浸出率。从元素的浸出行为、还原浸出液成分、还原浸出渣成分、还原浸出渣的处理四个方面对两种工艺进行了分析。研究表明，两种工艺能够有效的将溶液中Fe3+还原为Fe2+促进铁酸锌的溶解，提高有价金属的浸出率，并有利于后续工艺的锌铁分离，能够达到中浸渣的无害化处理和资源化利用。 关键词：还原浸出；中浸渣；铁酸锌

Study on reduction leaching zinc neutral leaching residue

Taking zinc neutral leaching residue as the research object, experimental study was carried out on the reduction leaching and SO2 reduction leaching of zinc sulfide concentrate, and the characteristics of the two processes were analyzed. With the continuous dissolution of zinc ferrite in the leaching process, a large amount of Fe3+ enters the solution, which leads to the increase of solution potential and inhibits the decomposition of zinc ferrite. Reductive leaching can effectively alleviate the effect of high potential on the decomposition of zinc ferrite in solution and improve the metal leaching rate. The two processes were analyzed from four aspects: leaching behavior of elements, composition of reductive leaching solution, composition of reductive leaching residue and treatment of reductive leaching residue. The results show that the two processes can effectively reduce Fe3+ to Fe2+ in solution, promote the dissolution of zinc ferrite, improve the leaching rate of valuable metals, and facilitate the separation of zinc and iron in subsequent processes. It can achieve harmless treatment and resource utilization of medium leaching residue.