Arsenic Reduction Kinetics during Vacuum Carbothermal Reduction of Dust with High Content of Arsenic and Copper

IF 0.6 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Russian Journal of Non-Ferrous Metals Pub Date : 2022-07-05 DOI:10.3103/S1067821222030026

Cong Li, Rong Liang Zhang, Jia Zeng, Chao Fan Tang, Wei Zhang, Jin Tao Cao, Yu Qian Tao, Jia Jun Li, Cheng Wang, Yi Fu He

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Abstract

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.

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高砷、高铜粉尘真空碳热还原过程中砷的还原动力学

本研究以铜的火法炼钢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。考察了还原温度、残余压力、还原剂用量、时间等因素对砷去除率的影响。以“缩核模型”为基础，对砷还原动力学进行了详细的分析和阐述。结果表明，降低还原温度、增加还原剂量、降低残余压力均能提高砷的去除率。砷的还原去除是由灰扩散控制的。在623 ~ 773 K温度范围内，反应的表观活化能为15.96 kJ/mol。真空碳热还原除砷的动力学方程为1 - 2a/3 - (1 - a)2/3 = 0.05774 exp[- 1919.05/T] T。

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来源期刊

Russian Journal of Non-Ferrous Metals METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

1.90

自引率

12.50%

发文量

审稿时长

3 months

期刊介绍： Russian Journal of Non-Ferrous Metals is a journal the main goal of which is to achieve new knowledge in the following topics: extraction metallurgy, hydro- and pirometallurgy, casting, plastic deformation, metallography and heat treatment, powder metallurgy and composites, self-propagating high-temperature synthesis, surface engineering and advanced protected coatings, environments, and energy capacity in non-ferrous metallurgy.