Iron-containing red mud coal-based direct reduction process and system

Abstract

The invention discloses an iron-containing red mud coal-based direct reduction process and system. Drying and levigating are carried out on red mud and high-volatile coal, blending is carried out on the red mud, the high-volatile coal, a binder and a metal aggregating agent according to the mass ratio of 1: 0.25-0.35: 0.01-0.03: 0.01-0.03, water is added for pelletizing after uniform mixing, carbon-containing pellets with particle size being 20 mm-25 mm are obtained; and the carbon-containing pellets are dried and then conveyed to a rotary hearth furnace, reduction roasting is directly carriedout, reducing is carried out on the red mud through H<2> generated through sufficient pyrolysis of the high-volatile coal and H<2> generated through a carbon gasification reaction with H<2>O as a gasifying agent, the hearth temperature is controlled to be 1250 DEG C-1280 DEG C, the roasting time is controlled to be 30 min-35 min, and the red mud can be sufficiently reduced. According to the iron-containing red mud coal-based direct reduction process and system, the red mud is efficiently reduced by adopting a hydrogen metallurgy process, and the iron-containing red mud coal-based direct reduction process and system have the advantages of high hearth heat transfer efficiency, high iron oxide reduction speed, high single-furnace capacity, high product quality and essential emission reduction.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and mineral engineering, and relates to an iron-containing red mud coal-based direct reduction process and system. Background technique [0002] Red mud is a strong alkaline solid waste produced after alumina or aluminum hydroxide is produced from bauxite. The utilization rate of red mud in China is only 4%, and most of them are stored in yards or dams by wet storage, which not only takes up a lot of land, but also causes serious environmental pollution, and a large number of valuable elements contained in red mud have not been recycled. . Reasonable treatment and efficient utilization of red mud not only meet the requirements of environmental protection, but also contribute to the sustainable development of human society. [0003] Red mud is rich in valuable metals such as iron, aluminum, titanium, etc. 2 o 3 Form exists, the particles are very fine, and the water content is high. Accordi...

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Problems solved by technology

[0009] In view of the above technical problems, the object of the present invention is to provide a coal-based direct reduction process and system of iron-containing red mud, which can solve the problems of high reduction temperature, long reduction time, low metallizati

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