Study on the Acid Leaching of Metal Components in Bayer Red Mud

摘要

Red mud is an alkaline waste generated in the industrial production of alumina. Direct storage in the open air will cause great harm to the environment. The secondary utilization of red mud is of great significance to environmental protection. In this experiment, acid leaching treatment on red mud to recover iron, aluminum, and titanium in red mud were carried out by using three different leaching agents of sulfuric acid, hydrochloric acid, and phosphorus-sulfuric mixed acid. The effects of leaching agent type, reaction time, leaching temperature, liquid-solid ratio, mechanical stirring speed, and other factors on the leaching effect of three metal elements were investigated by single factor experiments. Experimental results show that 25% sulfuric acid solution is the most suitable as the leaching agent. When the leaching temperature is 90 °C, the liquid-solid ratio is 10:1, the leaching time is 150 min, and the mechanical stirring speed is 300 rpm, the leaching effect of the three metal elements is the best.