中国有色冶金

It is of great significance for the smelting of lowgrade and highimpurity complex copper concentrates to explore the distribution characteristics of mpurity elements Pb, Zn, Asin the products during bottomblowing melting process, as well as the relationship between the melting parameters and the distribution pattern of impurity elements. This study adopts the method of combining theoretical analysis of thermodynamic calculation software Factsage and analysis of actual production data to explore the distribution characteristics of Pb, Zn, As in the product and its influence mechanism, and obtains the following main conclusions. Increase the temperature is conducive to the volatilization of Pb, Zn into the dust to reduce its proportion in the slag and matte, and is also conducive to the promotion of As transform from slag intodust, but it will lead to an increase in the proportion of As in the matte; Increasing ofFe/SiO₂ in salg will result in a gradual decrease in the distributionproportion of Pb and Zn in the slag and a gradual increase in the distributionproportioninmatte and slag, while the distributionproportion of As in the slag will increase. The increase of CaO content in the slag will make the distributionproportion of Pb and Zn in the slag decrease and increase in the dust and matte, the distributionproportion of As in the slag will increase and decrease in the dust. In the actual production operation, the smelting temperature can be increased to promote the volatilization of some impurity elements, in the appropriate reduction Fe/SiO₂of slag to improve the removal rate of Pb, Zn at the same time, with the addition of CaO to promote the transformation of As to the slag. Actual production data statistics show that the distribution of Pb in matte, slag, dust accounted for 23.86%, 33.12%, 43.02%, Zn were 4.47%, 88.54%, 6.99%, As were 16.58%, 15.34%, 68.08%.