| ArticleName |
Use of iron ore concentrate processing waste for treatment of copper
sulphate liquors |
| ArticleAuthorData |
Department of Energy-Efficient and Resource-Saving Industrial Technologies, National University of Science and Technology MISiS, Moscow, Russia
R. K. Shaykhutdinov, Postgraduate Student, e-mail: szaronskij@gmail.com
L. A. Polulyakh, Academic Secretary, Associate Professor, Candidate of Technical Sciences, e-mail: larisa_m@misis.ru |
| Abstract |
A quantitative distribution of arsenic between liquid, solid and gaseous middlings and dump waste products takes place during beneficiation and metallurgical processing of mineral material. In relation to copper, arsenic is an impurity and should be removed from the production processes. Up to 87 % of all incoming arsenic remains in electrolyte during electrolytic refining of anode copper. Thus, the concentration of arsenic in the circulating electrolyte can reach 2.5 to 13 g/dm3, which impacts the output of high-grade cathode copper. To maintain the required composition, a certain amount of electrolyte is removed and sent for copper extraction and to the copper sulphate production circuit, while fresh electrolyte is added. The current neutralization circuit for acid wastewater generated by copper electrowinning plants, which relies on the use of slaked lime, has the following characteristics: slaked lime consumption — 290 to 311 kg/m3 of acid wastewater, the weight of generated slime (on dry basis) — 548 to 554 kg/m3 of acid wastewater, the residual concentration of arsenic in purified solution — 0.3 to 1.0 g/dm3. Arsenic is a trace element. Its concentration in the Earth crust is 1.7·10–4 wt % and it can also be found in its native state. Arsenic minerals of commercial value include arsenopyrite FeAsS and iron arsenide FeAs2. Great amounts of arsenic get accumulated in the wastewater of many electrowinning facilities. Thus, its concentration in wastewater can reach 13 to 15 g/L. At the same time, the allowable concentration of arsenic is 0.0002 g/L. It means that treatment is required to remove arsenic compounds from the wastewater. |
| References |
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