Method for treating iron-containing red mud through coal-based shaft furnace technology

Abstract

The invention provides a coal-based shaft furnace process for treating iron-containing red mud. Through the coal-based shaft furnace direct reduction process, effective and large-scale comprehensive recycling of iron-containing red mud can be realized, and the production process is advanced and reliable, It can achieve large-scale production, stable product quality, low production cost, high production efficiency and good environmental protection; the metallization rate of the produced sponge iron is ≥90%, and the content of impurities and alkali metals is relatively low, which can be used as electric furnace steelmaking Raw materials, partial replacement of blast furnace oxidized pellets, converter coolant and raw materials for magnetic separation process, etc.

Description

technical field [0001] The invention belongs to the technical field of environmental protection for the comprehensive utilization of red mud resources, and in particular relates to a method for treating iron-containing red mud in a coal-based shaft furnace and its use in comprehensive recovery and utilization of red mud. Background technique [0002] At present, the production of red mud has caused direct and indirect impacts on many aspects of human production and life, so it is imminent to minimize the output and hazards of red mud and realize multi-channel and large-scale resource utilization. [0003] Since red mud is rich in iron resources, the realization of comprehensive recycling of iron-containing red mud resources has important practical significance for alleviating the shortage of iron ore resources in my country. At this stage, the main pretreatment process measures adopted to realize the separation and comprehensive utilization of red mud slag and iron are summa...

AI Technical Summary

Problems solved by technology

[0009] (1) Based on the traditional sintering / pelletizing oxidative roasting process, the conversion of high-iron red mud into oxidative sinter or pellets can realize large-scale red mud resource recovery and utilization, but there are high iron grade requirements for red mud raw ore, and sintering / Pellet roasting treatment of red mud has the problems of high production cost and unstable product quality; the prepared oxidative sinter / pellet is used as raw material for blast furnace smelting, and the content of alkali metal and gangue in the ore is high, which is easy to cause blast furnace alkali metal The increase in load and slag smelting will increase the difficulty of blast furnace smelting operation and increase the energy consumption of the process, which is not accepted by iron and steel enterprises, and it is difficult to achieve the goal of effective comprehensive utilization of red mud resources

[0010] (2) The traditional coal-based direct reduction process based on tunnel kiln method, rotary kiln method and rotary hearth furnace method can convert red mud iron fine powder into steelmaking raw materials with low gangue and alkali metal content or combine with magnetic separation process to obtain high yield The value-added reduced iron powder finally realizes the effective and comprehensive utilization of red mud, which has obvious technical advantages; however, due to the existence of different degrees of production scale in the traditional coal-based direct reduction process (tunnel kiln method, rotary kiln method and rotary hearth furnace method) Bottleneck, low metallization rate, low production efficiency, poor environmental protection, low economic value of magnetic separation, etc., so that industrialized large-scale production cannot be realized in the short term

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