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详细分析了硫化锌精矿中Zn、Fe、Pb、Cu几种硫化物的反应机理,阐述了两段加压浸出湿法炼锌浸出渣中元素硫的回收工艺流程及主要工艺技术指标,着重论述了对浸出渣中硫采用连续回收硫磺工艺生产元素硫应重点关注的特点。加压浸出反应中铁离子在ZnS浸出时起催化作用,磁黄铁矿及铁闪锌矿中铁的溶解对于锌的浸出是必要的,黄铁矿的存在对浸出产生不利影响;含铜硫化物在浸出时被氧化成硫酸盐;方铅矿氧化后最终以铅铁矾的形态入渣;硫大部分在浸出时形成元素硫进入浸出渣中,其余转化成硫酸根进入溶液。浸出渣中硫回收要注意硫磺精矿洗涤、过滤及干燥设备的选型应满足硫磺精矿含水量在15%以下,控制好硫磺精矿熔化时熔融粗硫与硫磺精矿的循环率(体积比)在72～120∶1,适当加大粗硫热过滤设备网板间距到150mm等。
The reaction mechanism of several sulfides of Zn, Fe, Pb and Cu in zinc sulfide concentrate was analyzed in detail, and the recovery process and the main technical indexes of the elemental sulfur in the two-stage pressurized leaching zinc leaching residue were described. The article focused on the characteristics of the sulfur in leaching residue, which is mainly concerned with the production of elemental sulfur by continuous recovery of sulfur. In the leaching reaction, iron ions play a catalytic role in the leaching of ZnS. The dissolution of iron in pyrrhotite and marcelite is necessary for the leaching of zinc, and the presence of pyrite adversely affects the leaching. Leaching is oxidized to sulfate; galena final oxidation of lead into the slag state of lead; most of the sulfur in the leaching of elemental sulfur into the leaching residue, the remaining into the sulfate into the solution. Sulfur leaching residue recovery should pay attention to sulfur concentrate washing, filtration and drying equipment selection should meet the moisture content of sulfur concentrate below 15%, control the melting of sulfur concentrate melted sulfur and sulfur concentrate recycling rate (volume Than) 72 ~ 120: 1, appropriate to increase coarse sulfur heat filtration equipment to 150mm spacing and so on.