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Optimization on selenium and arsenic conversion from copper anode slime by low-temperature alkali fusion process

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Abstract

A process was proposed to convert and separate selenium and arsenic in copper anode slime (CAS) by low-temperature alkali fusion process. Central composite design was employed to optimize the effective parameters, in which NaOH/CAS mass ratio, fusion temperature and fusion time were selected as variables, and the conversion ratio of selenium and arsenic as responses. Second-order polynomial models of high significance and 3D response surface plots were constructed to show the relationship between the responses and the variables. Optimum area of >90% selenium conversion ratio and >90% arsenic conversion ratio was obtained by the overlaid contours at NaOH/CAS mass ratio of 0.65-0.75, fusion temperature of 803-823 K and fusion time of 20-30 min. The models are validated by experiments in the optimum area, and the results demonstrate that these models are reliable and accurate in predicting the fusion process.

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Author information

Correspondence to Dong Li 李栋.

Additional information

Foundation item: Project(51234009) supported by the National Natural Science Foundation of China; Project(2014DFA90520) supported by International Cooperation Program of Ministry of Science of China; Project(2013A100003) supported by the Production, Teaching and Research Program of Guangdong Province, China

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Guo, X., Xu, Z., Tian, Q. et al. Optimization on selenium and arsenic conversion from copper anode slime by low-temperature alkali fusion process. J. Cent. South Univ. 24, 1537–1543 (2017). https://doi.org/10.1007/s11771-017-3558-x

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Key words

  • optimization
  • low-temperature alkali fusion
  • copper anode slime
  • selenium
  • arsenic
  • central composite design