Sustainable Mining and Metallurgy

In this paper, potassium chloride was recovered from the electric dust of alumina rotary kiln by water leaching method. The effects of different treatment conditions on the recovery of potassium chloride from fly ash in the processes of water leaching dissolution, impurity removal and purification, and segmented crystallization were investigated. The effects of liquid-solid ratio, seed addition and other factors on the separation and purification of KCl were investigated. The test results show that the effective recovery rate of potassium chloride is more than 90%, and the KCl product is a single phase, which meets the industrial potassium chloride standard. The process of extracting potassium chloride by water immersion method is simple, safe, low equipment requirements, energy saving and environmental protection, which provides a new idea for the resource utilization of electric dust collection in alumina rotary kiln.