含砷铜烟尘砷的选择性分离实验

doi:10.11896/j.issn.1005-023X.2018.18.003

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Abstract In order to separate As from As-contained dust, the dust was treated by roasting at low temperature under nitrogen atmosphere. The influence of temperature, nitrogen flow rate and roasting time on the evaporation rate of As were discussed in this paper. The methods such as XRD analysis and thermogravimetric analysis were employed to study the evaporation process of As. The kinetics of As evaporation was also investigated. It was demonstrated that selective separation of As should be taken at low temperature in order to avoid evaporation loss of Zn, Pb at high temperature and producing arsenates which are hard to volatile. The evaporation rate of As was 95.68%, the content of arsenic in the slag was 0.79%, and other valuable metals were not volatile under the conditions of roasting temperature of 250 ℃, nitrogen flow rate of 300 mL/min and roasting time of 120 min. As was selectively separated from other valuable metals and was recovered in the form of As₂O₃ with a purity of 96.85%. It was demonstrated by kine-tic study that the selective separation process of As at low temperature was in accordance with the shrinking ore model in a certain range. The apparent activation energy was 19.71 kJ/mol and As evaporation process was controlled by internal diffusion.

Key words： copper dust containing As arsenic trioxide arsenate evaporation kinetics

Published: 18 October 2018

CLC number:

TF046

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	Articles by authors
	LI Xuepeng
	LIU Dachun
	WANG Juan

Cite this article:

LI Xuepeng,LIU Dachun,WANG Juan. Selective Separation Experiments of As from Copper Dust Containing As[J]. Materials Reports, 2018, 32(18): 3110-3115.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.18.003 OR http://www.mater-rep.com/EN/Y2018/V32/I18/3110

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