Sustainable Mining and Metallurgy

After leaching and copper extraction of copper-cobalt ore in a certain area, the content of iron and manganese in the raffinate is high. Direct precipitation of cobalt will affect the purity of cobalt hydroxide products, so neutralization precipitation method is used to remove iron. For the iron slag produced in the neutralization process, the cobalt content in the slag was reduced by slurry washing. The single factor and orthogonal experiments of iron slag slurry washing process conditions were carried out to analyze the effects of different washing water, pH value of reaction end point, time and liquid-solid ratio on cobalt washing efficiency and iron leaching rate in iron removal slag. The results show that the cobalt content of the obtained iron slag is less than 0.1%, the cobalt washing efficiency reaches 85%, and the iron leaching rate is less than 10% when the cobalt precipitation lean solution is used for washing, the reaction end point pH value is 3, the liquid-solid ratio is 5∶1, and the washing time is 30min.