Short-process comprehensive red mud utilization method and equipment

Abstract

The invention relates to a short-process environmentally-friendly comprehensive red mud utilization method and equipment for comprehensively utilizing energy, which can be used for refining iron in high-pollution red mud difficult to treat, with high efficiency, high quality and high benefits, and applying the iron to electric furnace steel making or steel casting and the like, without using coke, so as to realize the large-scale comprehensive utilization of the red mud. High-temperature smoke of a revolving bed is used for waste heat generation, secondary-combustion hot wind preheating, pellets preheating and red mud drying, a dry quenching pellet technology is used for applying the heat of high-temperature pellets to waste heat generation so that waste heat is fully utilized, a low-cost pressure swing adsorption oxygen generation technology is utilized, and therefore, the comprehensive energy consumption and the production cost are low. Aluminum silica residues are used for producing high-grade cement or used as the raw material for refractory materials; and Na2O and K2O and other alkaline metallic oxide powder are used for refining metal Na and K, or used for producing the raw materials of fertilizers, or used as chemical raw materials. Accordingly, the problems on environmental pollution, land occupation for stacking and safety due to the red mud are thoroughly solved, and the economic and social benefits are obvious.

Description

technical field [0001] The invention relates to a production process of iron and refractory materials, in particular to a process and equipment for separating iron, aluminum-silicon slag and alkali metal from red mud, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] Red mud is the solid waste produced during the extraction of alumina from bauxite. Due to different mineral sources and refining methods, at present, for every ton of alumina produced in my country, about 1 to 2 tons of red mud are produced. The red mud discharged after the Bayer method is widely used to extract alumina is mainly composed of: Fe 2 o 3 : 40~70%, SiO 2 : 7~12%, Al 2 o 3 : 9~18%, TiO 2 : 3~9%, Na 2 O: 3~11%, CaO: 1~3%, Mn: 0.05~0.15%, K 2 O: 0.2-0.4%, MgO: 0.15-0.50%, S: 0.02-0.12%, P: 0.02-0.06%, moisture 5-15%. At present, the stockpiling of red mud in my country has reached 200 million tons, and it is estimated that the stockpiling of red mud...

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies of the existing technology and the fact that hundreds of millions of tons of red mud stocks cannot be comprehensively utilized in large quantities and cause environmental p...

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