In this study, arsenic removal was carried out via low-temperature vacuum carbothermal reduction method by utilizing dust containing higher content of arsenic and copper from pyrometallurgical refining furnaces of copper as raw materials. Effect of various factors such as reduction temperature, residual pressure, reductant dosage and time on the removal rate of arsenic was investigated and explored in detail. Arsenic reduction kinetics was analyzed and elaborated in detail on the basis of “shrinking-core model”. The results show that arsenic removal rate is enhanced with low reduction temperature and increasing amount of reduction dose, and decreasing residual pressure. Arsenic reduction removal is indicated to be controlled by ash diffusion. Apparent activation energy ~15.96 kJ/mol is determined for the reaction in the temperature range of 623–773 K. The kinetic equations for arsenic removal during vacuum carbothermal reduction can be described as 1 – 2a/3 – (1 – a)^2/3 = 0.05774 exp[–1919.05/T]t.

本研究以铜火法精炼炉中砷和铜含量较高的粉尘为原料，采用低温真空碳热还原法进行除砷。详细考察和探讨了还原温度、残压、还原剂用量和时间等多种因素对砷去除率的影响。在“缩核模型”的基础上，对砷的还原动力学进行了详细的分析和阐述。结果表明，随着还原温度的降低、还原剂量的增加、残压的降低，砷的去除率提高。表明砷还原去除受灰扩散控制。表观活化能~15。a /3 – (1 – a ) ^2/3 = 0.05774 exp[–1919.05/ T ] t。