Sustainable Mining and Metallurgy

The content of copper, arsenic and bismuth in the lead anode slime of a company is high. Lead oxide is used as the ingredient in the lead-fire gold test method, and the ability to remove impurities is limited. To address this problem，potassium nitrate was added as the oxidant to prepare the test material, and the process of melting and slagging was controlled, so that impurities were volatilized and oxidized, creating favorable conditions for the next ash blowing. In the ash blowing process, the operating furnace temperature was controlled and the auxiliary conditions were adopted to make base metals such as copper, arsenic and bismuth not affect the ash blowing process and be absorbed by the ash pan, so as to obtain accurate gold and silver analysis results.