Mechanism of CaO Action in Smelting Slag During Oxygen-Enriched Smelting of Complex Copper Concentrate
With the increasing depletion of high-grade copper ore,the raw materials for copper smelting are be-coming more complex,and the high impurity elements lead to the low quality of copper products.CaO is a com-monly used slagging agent in the process of copper smelting,which has an important influence on the copper con-tent in slag and the removal of impurity element.In this paper,the influence mechanism of CaO on the copper content in slag and impurity elements(As,Pb,Zn)migration and distribution pattern during the production of high grade matte by oxygen-enriched smelting was studied.The results show that with the increase of CaO con-tent,the copper content in the slag initially increases and then decreases.The proportion of arsenic in the slag phase increases,and the proportion in the matte phase and the gas phase decreases.Arsenic mainly exists in the form of arsenate in the slag,and CaO promotes arsenic removal into the slag phase;the proportion of lead and zinc in the slag phase decreases,and the proportion in the matte phase and the gas phase increases.When the CaO content increased from 1.25%to 8%,the main forms of lead and zinc in the slag changed from silicate to sul-fide,resulting in more lead and zinc transferring into matte.
complex copper concentrateCaOcopper in slagimpurity elementsmigration distribution pattern