A method for recovering iron from high-iron red mud

Abstract

The invention discloses a method for recycling iron by utilizing high-iron-content red mud. The method for recycling the iron by utilizing the high-iron-content red mud comprises the steps that a 10-30 mm of red mud mass block is made from the even mixture of the high-iron-content red mud, reducing agent and additives; mass percent of the additives in ingredient composition is 3-10 wt%, the ratio of the high-iron-content red mud and the reducing agent is reasonably matched, so that molar ratio C / O of carbon and iron oxide in the red mud mass block is 1.2-1.5; the reducing agent is one of pulverized coal, coke powder and coking dust-removal ash; the additives are calcium ferrite powder; and the red mud mass block is added into an empty slag pot in advance, high temperature molten slag is injected during slag tapping, after-treatment is conducted by adopting a general slag disposal process after reaction for 10-30 minutes, and magnetic separation treatment is conducted on the cooling slag to separate the slag and the iron.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a treatment method for recovering iron from red mud, in particular to a method for using high-temperature metallurgical slag to process high-iron red mud and recover iron. Background technique [0002] Red mud is the solid waste discharged during the alumina production process in the alumina plant. Generally, about 0.8-1.8 tons of red mud is produced for every 1 ton of alumina produced. Its comprehensive utilization rate is very low. According to statistics, the accumulated stock of red mud in my country has reached More than 200 million tons, not only occupy a large amount of land, but also cause environmental pollution and safety hazards. Red mud contains more valuable elements such as iron and aluminum, especially the red mud that is discharged after the Bayer process is used to produce alumina, generally has a high iron content (Fe 2 o 3 content of 30% to 70%), so the recyc...

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Problems solved by technology

[0004] Most of the current high iron red mud treatment methods need to add special devices or equipment, and there are many process steps, which complicate the process operation; or strict control conditions, high energy consumption, and low recovery rate lead to increased costs, making it difficult to achieve large-scale industrial production application

[0005] On the other hand, iron and steel enterprises will produce a large amount of high-temperature slag during the smelting process, mainly including blast furnace slag and steel slag, with a temperature of 1450°C to 1650°C. Although there are many processing and application processes, sensible heat recovery and utilization is still a priority in the metallurgical industry. the puzzle

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