Study On The Migration And Distribution Behavior Of Arsenic, Lead And Zinc During Oxygen-enriched Smelting Of Complex Copper Concentrat

With the depletion of high-grade copper ore resources,the raw materials for copper smelting are becoming more and more complex.The influence of process parameters on the migration and distribution of impurity elements（As,Pb,Zn）is not clear.The blowing furnace process faces increasing impurity-removal pressure and increased production cost.Due to the low impurity-removal efficiency of high-grade matte produced by copper oxygen-enriched smelting,the content of impurity elements（As,Pb,Zn）in matte is high.In this research,to produce high-grade matte,the effects of temperature,iron-silicon ratio,oxygen concentration and CaO on the migration and distribution of impurity elements（As,Pb,Zn）in three phases and the removal rate of impurity elements were simulated and analyzed by thermodynamic software FactSage.The occurrence state of impurity elements（As,Pb,Zn）in the input and output materials in oxygen-enriched smelting process was analyzed,and the phase transformation mechanism of impurity elements in oxygen-enriched smelting process was revealed.The effects of temperature,iron-silicon ratio,oxygen concentration and CaO on the oxygen-enriched smelting process were studied.The specific research results are as follows:（1）The FactSage calculation results show that reducing temperature and iron-silicon ratio,increasing oxygen concentration and CaO content are beneficial to the removal of arsenic impurity in matte.Increasing the temperature,and reducing the iron-silicon ratio,oxygen concentration and CaO content are beneficial to the removal of lead and zinc impurities in matte.（2）The Arsenic element in copper concentrate exists in the form of mainly arsenopyrite（FeAsS）.After oxygen-enriched smelting of copper concentrate,arsenic exists in the form of mainly As₄,As₄S₄and As₂O₃in dust,Fe As O₄,As₂O₃and FeAsS in slag,and As and FeAsS in matte.Low smelting temperature,low iron-silicon ratio,high oxygen concentration and high CaO content are beneficial to improve the removal rate of arsenic impurity in matte,and the removal rate of arsenic can reach 99.92%..（3）Lead in copper concentrate exists in the form of mainly PbO and PbS.After oxygen-enriched smelting of copper concentrate,lead exists in the form of mainly Pb,PbS and PbO in dust,PbSi O₃in slag,and PbS and PbO in matte.High smelting temperature,low iron-silicon ratio,low oxygen concentration and low CaO content are beneficial to improve the removal rate of lead impurity in matte,and the removal rate of lead can reach 98.21%.（4）Zinc in copper concentrate exists in the form of mainly ZnS.After oxygen-enriched smelting of copper concentrate,zinc exists in the form of mainly Zn and ZnS in dust,Zn₂Si O₄and Zn Fe₂O₄in slag,and ZnS in matte.High smelting temperature,low iron-silicon ratio,low oxygen concentration and low CaO content are beneficial to improve the removal rate of zinc impurity in matte,and the removal rate of zinc can reach97.62%.