Study on Comprehensive Utilization of Arsenic from High Arsenic-Bearing Copper Sulphide Concentrate

Abstract:

In this paper a new technology for comprehensive utilization of arsenic in high-arsenic copper sulfide concentrate has been studied out. Firstly,the concentrate was bioleached by moderate thermophile Sulfobacillus thermosulfidooxidans, under the suitable leaching conditions, the experiments results show that the concentrate is bioleached 82% of Cu,78% of As and 40% of Fe. Secondly, removal of Fe3+ by solvent extraction with P204 from bacterial leaching solution are presented, and Fe3+ is extracted up to 93％, and the content of Fe3+ in raffinate is under 9 mg/L. The comprehensive utilizations of most of arsenic from leaching liquor after removal Fe3+ has been carried out. When the temperature is 80 to 90°C, pH at 4.0~5.0 and ammonia as a neutralizer, the results of XRD analysis show that the forming process of copper arsenate is complicated, and the formed molecular formulas are in different types, and they are CuAs2O4, Cu5As2O10•5H2O, C4H6As6Cu4O16, Cu5As4O15•9H2O and Cu2AsO4OH•3H2O. The comprehensive utilizations of most of arsenic are in the form of copper arsenate, and the content of arsenic is 9.11~35.82mg/L in solution after its precipitated. This study provides a new treatments and process for the utilization of arsenic in the high-arsenic copper sulfide concentrate.

• Periodical: Advanced Materials Research (Volumes 610-613)
• Pages: 2421-2424
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.610-613.2421
• Online since: December 2012
• Authors: Hai Yun Xie, Zhuo Yue Lan, Dian Wen Liu, Xiong Tong
• Keywords: Bioleaching, Copper Arsenate, High-Arsenic Sulfide Copper Concentrate, P204, Sulfobacillus Thermosulfidooxidans

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