Method and system for preparing carbonyl iron powder by utilizing red mud

Abstract

The invention discloses a method and system for preparing carbonyl iron powder by utilizing red mud. The method comprises the following steps of: (1) mixing red mud, coal and additives to obtain a mixture, and performing pelletization on the mixture so as to obtain a mixed pellets; (2) performing reduction processing on the mixed pellets so as to obtain metalized pellets; (3) performing separation processing on the metalized pellets so as to obtain iron powder and tailings; (4) enabling the iron powder to be in contact with carbon monoxide so as to obtain a gaseous mixture containing carbonyl iron and carbon monoxide; (5) condensing the gaseous mixture containing the carbonyl iron and the carbon monoxide so as to obtain liquid carbonyl iron and first carbon monoxide; and (6) decomposing the liquid carbonyl iron so as to obtain carbonyl iron powder and second carbon monoxide. Through the adoption of the method, the red mud can be effectively utilized, and carbonyl iron powder with a high additional value can be obtained, so that the difficult problems that the industrial wastes, such as red mud, are low in utilization rate and need to be piled and stored for a long time are fundamentally solved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular, the invention relates to a method and a system for preparing carbonyl iron powder from red mud. Background technique [0002] Red mud is the main waste generated during the production of alumina. Generally, 0.8-1.5 tons of red mud is produced for every ton of alumina produced. Because red mud contains many components and complex structure, its comprehensive utilization has become a worldwide scientific research problem. At present, it is mainly stockpiled, and the stockpiling of red mud not only takes up a lot of land, but also consumes a lot of maintenance costs. The alkali in the red mud will pollute the land environment and deteriorate the ecological environment. A large amount of valuable metals cannot be fully utilized, resulting in a waste of resources. With the increasing depletion of mineral resources and people's emphasis on environmental pollution, how to maximize t...

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Problems solved by technology

To this end, an object of the present invention is to propose a method and system for preparing carbonyl iron powder from red mud, which can realize the effective utilization of red mud and obtain carbonyl iron powder with high added value, thereby fundamentally solving the problem of The problem of low utilization rate and long-term stockpiling of red mud, an industrial waste

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