Tingan Zhang

Abstract:

With the improvement of technology and scale in Chinese aluminium industry, the annual emission of red mud was substantially increased these years. The red mud emission amount was 50 million ton in 2011 and the utilization technology of red mud attracts academic and industrial fields' extensive attention. Under this condition, "Calcification-Carbonat-ion Method" was put forward to deal with middle-low grade bauxite and red mud by Northeastern University. The main purpose of this method is to change the balance phase of red mud into 2CaO.SiO2 and CaCO3 with hydrometallurgical process. Through treatment by "Calcification-Carbonation Method", A/S of the new structure red mud lowed below 0.2 and the Na content lowed below 0.2%, which could be used in cement industry directly. This paper mainly introduced the technological idea and principle of new method, process comparison and typical experiment results are given as well.