绿色矿冶

A large domestic smelting enterprise adopts bottom-blown furnace reduction process to treat copper scum, which has problems such as low arsenic removal rate, low tin recovery rate, high yield of arsenic matte, high arsenic content of black copper produced by smelting, and large amount of intermediate return material treatment. In this paper, the low temperature oxidation process of bottom-blown furnace was proposed. The copper scum was directly added to the bottom-blown furnace for smelting. No longer adding any auxiliary materials to make slag, that is, no longer artificially manufacturing high melting point FeO-SiO₂-CaO slag type, but choosing PbO slag type with relatively low melting point, and the furnace temperature was reduced to 750℃. Using low temperature oxidation process , the smelting atmosphere in the bottom-blown furnace was changed from the traditional reducing atmosphere to the weak oxidizing atmosphere, and the production of arsenic matte was finally eliminated. At the same time, the recovery rate of tin was increased from 18.13% to 93.23%, the smelting slag type was changed from the original high melting point FeO-SiO₂-CaO slag type to the low melting point PbO slag type, the smelting temperature was reduced from 1100℃ to about 750℃, the smelting energy consumption was greatly reduced, the processing cost of copper scum smelting was reduced by more than 60%, the labor intensity was greatly reduced, and the production process was more smooth.