Research Progress on Dealkaliation Methods and Mechanism of Red Mud

Abstract

Abstract: Red mud is a strong alkaline waste produced during the production of alumina, and its high alkaline is an important factor restricting its large-scale comprehensive utilization. Therefore, it is extremely necessary to dealkalize red mud in order to achieve its comprehensive utilization and ensure the sustainable development of the aluminum industry. In this paper, the domestic and foreign red mud dealkaliation methods are reviewed, such as water washing, acid leaching, lime leaching, salt leaching, CO₂ method, biological method, etc. At the same time, the characteristics of various dealkalization methods and the main dealkalization mechanism are analyzed from the perspective of free alkali and chemical combined alkali. It is concluded that the principle of red mud dealkalization is mainly neutralization reaction, precipitation reaction and sodium replacement reaction. At last, the existing problems of various dealkaliation methods are analyzed, and the current suggestions for the study of red mud dealkalization are put forward. This provides a reference for the progress of red mud dealkalization technology and the comprehensive utilization of red mud.

Key words: red mud, dealkaliation method, dealkaliation mechanism, free alkali, chemical combined alkali

CLC Number:

X705

CHEN Shan, CHEN Yunjian, XIE Xin, DONG Zejing, ZHANG Qin, FU Jiangli, HUANG Jianhong. Research Progress on Dealkaliation Methods and Mechanism of Red Mud[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3414-3426.

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