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对废镀锌板炼钢粉尘加压硫酸浸出工艺进行了研究,并与常压酸浸进行了对比。探讨了初始硫酸浓度、浸出时间、液固比、浸出温度对浸出率的影响。结果表明,采用加压浸出技术可使常温弱酸下不溶的铁酸锌和难处理的硅酸锌高效浸出。在釜内压力0.6MPa、浸出温度140℃、液固比6∶1、搅拌速度500 r/min、硫酸浓度120 g/L、浸出时间1.5 h条件下,浸出矿浆无胶体形成、过滤性能良好,锌、铁浸出率分别为98.35%和3.51%,铅几乎全部进入渣相,浸出液中硅含量仅为0.06 g/L,实现了粉尘中锌与杂质的有效分离。
The leaching process of pressured sulfuric acid from scrap galvanized steel was studied and compared with the acid leaching. The effects of initial sulfuric acid concentration, leaching time, liquid-solid ratio and leaching temperature on leaching rate were discussed. The results show that the pressure leaching technology can be room temperature weak acid insoluble zinc ferrite and refractory zinc silicate efficient leaching. Under the conditions of pressure 0.6 MPa, leaching temperature 140 ℃, liquid-solid ratio 6:1, stirring speed 500 r / min, sulfuric acid concentration 120 g / L and leaching time 1.5 h, the leaching slurry had no colloid formation and good filtration performance. The leaching rates of zinc and iron were 98.35% and 3.51%, respectively, and almost all lead entered the slag phase. The content of silicon in the leachate was only 0.06 g / L, which enabled the effective separation of zinc and impurities in the dust.