湿法炼锌中锌铁分离回收铁的新工艺研究
发布时间：2019-01-25 08:46
【摘要】：传统锌湿法冶炼工艺“氧化焙烧-浸出-净化-电积”中,硫化锌精矿在氧化焙烧过程中不可避免的产生铁酸锌,而铁酸锌在低温低酸中难以被溶出,导致锌的浸出率不高,而且会产生大量锌浸出渣,不仅浪费了锌铁资源,还对环境造成严重的污染。所以课题提出了“磁化焙烧-低酸浸出-磁选”或“磁化焙烧-磁选-低酸浸出”处理高铁锌焙砂的新工艺,并对各工艺流程进行了系统的研究,得出了一些有意义的结果:还原焙烧能使高铁锌焙砂中的铁酸锌选择性的分解为氧化锌和磁铁矿,有利于提高锌在低酸中的浸出率以及方便铁的磁选回收。通过还原焙烧和磁选分离实验可知,采用“还原焙烧-低酸浸出-磁选”处理高铁锌焙砂的工艺是可行的,可以实现锌铁分离。锌焙砂先经磁选后,绝大部分铁在磁精矿中,磁精矿再经低酸浸出作业后。磁精矿Ⅰ的铁品位可达52%、磁精矿Ⅱ的铁品位可达49%,铁的总回收率为92%,产出的铁精矿可以与高品位的炼铁原料搭配使用。整个工艺过程中损失的锌为8.4%。通过组合锌焙砂还原焙烧的条件实验得出最佳焙烧温度800℃,焙烧时间45min,烟煤用量11%。磁选的最佳条件分别是磁场强度为800G,磁选时间1Omin,粒度450目,同时浸出的最佳条件是初始硫酸浓度为70g/L,浸出时间30min。在这样的条件下可以使铁有效的从组合锌焙砂中分离。
[Abstract]:In the traditional zinc hydrometallurgical process, zinc ferrate is unavoidable in the oxidation roasting, leaching, purification and electrodeposition of zinc sulfide concentrate, but zinc ferrate is difficult to be dissolved at low temperature and low acid, which leads to the low leaching rate of zinc. Moreover, a large amount of zinc leaching slag will be produced, which not only wastes zinc and iron resources, but also causes serious environmental pollution. Therefore, a new process of "magnetization roasting-low acid leaching-magnetic separation" or "magnetization roasting-magnetic separation-low acid leaching" to treat high iron zinc calcine is put forward, and each technological process is systematically studied. Some significant results are obtained: reduction roasting can selectively decompose zinc ferrate into zinc oxide and magnetite in high iron zinc calcine, which is beneficial to increase leaching rate of zinc in low acid and to facilitate magnetic separation and recovery of iron. Through the experiments of reduction roasting and magnetic separation, it can be seen that it is feasible to treat high iron zinc calcine with "reduction roasting, low acid leaching and magnetic separation", and the separation of zinc and iron can be realized. After the zinc calcine is separated by magnetic separation, most of the iron is in the magnetic concentrate, which is then leached by low acid. The iron grade of magnetic concentrate I can reach 52%, the iron grade of magnetic concentrate 鈪，
本文编号：2414983
[Abstract]:In the traditional zinc hydrometallurgical process, zinc ferrate is unavoidable in the oxidation roasting, leaching, purification and electrodeposition of zinc sulfide concentrate, but zinc ferrate is difficult to be dissolved at low temperature and low acid, which leads to the low leaching rate of zinc. Moreover, a large amount of zinc leaching slag will be produced, which not only wastes zinc and iron resources, but also causes serious environmental pollution. Therefore, a new process of "magnetization roasting-low acid leaching-magnetic separation" or "magnetization roasting-magnetic separation-low acid leaching" to treat high iron zinc calcine is put forward, and each technological process is systematically studied. Some significant results are obtained: reduction roasting can selectively decompose zinc ferrate into zinc oxide and magnetite in high iron zinc calcine, which is beneficial to increase leaching rate of zinc in low acid and to facilitate magnetic separation and recovery of iron. Through the experiments of reduction roasting and magnetic separation, it can be seen that it is feasible to treat high iron zinc calcine with "reduction roasting, low acid leaching and magnetic separation", and the separation of zinc and iron can be realized. After the zinc calcine is separated by magnetic separation, most of the iron is in the magnetic concentrate, which is then leached by low acid. The iron grade of magnetic concentrate I can reach 52%, the iron grade of magnetic concentrate 鈪，
本文编号：2414983
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