Integrated hydrometallurgical process for production of zinc from electric arc furnace dust in alkaline medium.
Integrated hydrometallurgical process for production of zinc from electric arc furnace dust in alkaline medium.
复制标题
DOI：
10.1016/s0304-3894(00)00305-8
复制
发表时间：
2000-12
影响因子：
13.6
通讯作者：
Z. Youcai;R. Stanforth
中科院分区：
文献类型：
--
作者：
Z. Youcai;R. Stanforth
在这项研究中，报道了一种在碱性介质中利用电弧炉（EAF）粉尘生产锌粉的新型集成湿法冶金工艺。粉尘首先在水中水解，然后在350℃烧碱中熔融1h，然后在碱性溶液中浸出，锌和铅均被有效提取。使用硫化钠作为沉淀剂通过沉淀选择性地去除铅后，然后通过电解从浸出液中生产锌粉。测试的电弧炉粉尘含有 25% Zn、1.8% Pb 和 33% Fe。结果发现，直接用烧碱溶液浸出，可从粉尘中提取出38%的锌和68%的铅。当粉尘直接与烧碱熔融并进行碱浸时，锌的浸出率增加到80%。然而，当粉尘在熔化前先用水水解时，浸出率进一步增加至95%。然后从贫铅溶液中电解提取出纯度为99.95%的锌粉。不锈钢电极用作阳极和阴极。
In this study, a novel and integrated hydrometallurgical process for the production of zinc powder from electric arc furnace (EAF) dust in alkaline medium is reported. The dust is firstly hydrolysed in water, and then fused in caustic soda at 350°C for 1h, followed by leaching in alkaline solution in which both zinc and lead are effectively extracted. Zinc powder is then produced by electrowinning from the leach solution after the lead is selectively removed by precipitation using sodium sulphide as precipitant. The EAF dust tested contained 25% Zn, 1.8% Pb and 33% Fe. It was found that 38% of zinc and 68% of lead could be extracted from the dust when leached directly in caustic soda solution. Leaching of zinc increased to 80% when dust was directly fused with caustic soda followed by alkaline leaching. However, the leaching further increased to 95% when the dust was hydrolysed first with water before fusion. Zinc powder with a purity of 99.95% was then produced by electrowinning from the lead depleted solution. Stainless electrodes were used as both anode and cathode.