Arsenic removal from arsenic-containing copper and cobalt slag using alkaline leaching technology and MgNH4AsO4 precipitation
Arsenic removal from arsenic-containing copper and cobalt slag using alkaline leaching technology and MgNH4AsO4 precipitation
复制标题
碱浸技术和MgNH4AsO4沉淀法从含砷铜钴渣中脱砷
DOI：
10.1016/j.seppur.2019.116422
复制
发表时间：
2020-05
影响因子：
8.6
通讯作者：
Tang Honghu
中科院分区：
文献类型：
--
作者：
Zhang Xingfei;Tian Jia;Han Haisheng;Sun Wei;Hu Yuehua;Wang Tong Yue Li;Yang Yue;Cao Xuefeng;Tang Honghu
本研究采用新型碱循环浸出和MgNH4AsO4沉淀技术去除含砷铜钴渣中的砷。物相分析结果表明砷形态主要存在于Cu-As合金原渣中。采用NaOH-H2O2浸出法，在最佳条件下砷浸出率高达94.5%。 XRD结果表明，Cu-As合金中的铜在高浓度NaOH溶液中被氧化为Cu(OH)2。确定最佳条件为：NaOH浓度，2 mol/L；浸出温度，25℃； H2O2浓度，5%；液固比(L/S)为9:1。热力学分析表明，在碱浸液中以MgNH4AsO4的形式选择性沉淀砷是可行的。 XRD结果表明，滤渣中的砷主要以MgNH4AsO4·6H2O的形式存在，其结晶度良好，有利于砷与碱的更好分离。在最佳条件下，纯化液和纯化残渣中砷的含量分别为39 mg/L和24.15%。这样，纯化后的碱液可以循环用于浸出过程，有利于降低成本和保护环境。
In this study, a novel alkaline cycle leaching and MgNH4AsO4precipitation technology was used to remove arsenic in arsenic–containing copper and cobalt slag. The phase analysis results indicated the arsenic species mostly existed in the original slag as Cu-As alloy. By adopting NaOH-H2O2leaching method, the arsenic leaching reached as high as 94.5% under the optimum conditions. The XRD results indicated that copper in the Cu-As alloy was oxidized to be Cu(OH)2in high concentration NaOH solution. And the optimum conditions were established as: NaOH concentration, 2 mol/L; leaching temperature, 25℃; H2O2concentration, 5%; and liquid-solid ratio (L/S), 9:1. Thermodynamic analysis showed that it was feasible to selectively precipitate arsenate in alkaline leaching solution in the form of MgNH4AsO4. The XRD results confirmed that the arsenic in the filter residue mainly existed in the form of MgNH4AsO4·6H2O, which has good crystallinity, contributing to a better arsenic and alkali separation. Under the optimum conditions, the content of arsenic in the purified liquid and purified residue were 39 mg/L and 24.15%, respectively. Thus, the purified alkaline solution could be circulated for the leaching process, which is beneficial to the cost reduction and environment protection.
登录
查看更多内容
DOI：
10.2473/shigentosozai.116.779
发表时间：
2000
期刊：
Shigen-to-sozai
影响因子：
--
作者：
T. Ohgai;H. Fukushima;T. Akiyama;S. Heguri
通讯作者：
T. Ohgai;H. Fukushima;T. Akiyama;S. Heguri
影响因子：
11.4
作者：
Bothe, JV;Brown, PW
通讯作者：
Brown, PW
影响因子：
8.6
作者：
Gu, Kunhong;Li, Wenhua;Cai, Lianbing
通讯作者：
Cai, Lianbing
影响因子：
4.8
作者：
Awe, Samuel A.;Sandstrom, Ake
通讯作者：
Sandstrom, Ake
影响因子：
8.7
作者：
Channratha Prum;R. Dolphen;P. Thiravetyan
通讯作者：
Channratha Prum;R. Dolphen;P. Thiravetyan