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A method for recovering iron from high-iron red mud

A technology of high-iron red mud and iron recovery, which is applied in the treatment of iron recovery from red mud, and in the field of high-temperature metallurgical slag treatment of high-iron red mud recovery iron, which can solve the problems of complicated process operation, difficult heat recovery and utilization, and low recovery rate. , to achieve the effect of good reaction thermodynamic conditions and kinetic conditions, large-scale comprehensive utilization, and rapid smelting reduction

Active Publication Date: 2019-04-26
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A method for recovering iron from high-iron red mud

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Effect test

Embodiment 1

[0028] Use a mixer to mix high-iron red mud, coke powder, and calcium ferrite powder in proportion and stir evenly, then use a ball press to make a 10-30mm red mud agglomerate, and wait until the agglomerate is dried to a moisture content of ≤3% for later use. The proportion of calcium ferrite powder is 3.5wt%, and the rest is high-iron red mud and coal powder. The molar ratio of fixed carbon content in coal powder to oxygen content of iron oxide in high-iron red mud is C / O=1.25. The chemical composition of high-iron red mud in this embodiment is mainly: Fe 2 o 3 65.2wt%, Al 2 o 3 8.1wt%, Na 2 O is 2.4wt%, the rest is SiO 2 , CaO and other impurities; the fixed carbon content of the coke powder is 85.6wt%, the sulfur content is 0.9wt%; the calcium ferrite content in the additive is 95.5wt%.

[0029]Put 1.5t of red mud lumps into the empty slag tank (about 32t of slag capacity) in the steelmaking work area, and then inject the steelmaking slag into the slag when the slag i...

Embodiment 2

[0031] Use a mixer to mix high-iron red mud, coal powder, and calcium ferrite powder in proportion and stir evenly, then use a briquetting machine to make a 10-30mm red mud agglomerate, and wait until the agglomerate is dried to a moisture content of ≤3% for later use. The proportion of calcium ferrite powder is 6.7wt%, and the rest is high-iron red mud and coal powder. The molar ratio of fixed carbon content in coal powder to oxygen content of iron oxide in high-iron red mud is C / O=1.45. The chemical composition of high-iron red mud in this embodiment is mainly: Fe 2 o 3 35.3wt%, Al 2 o 3 26.1wt%, Na 2 O is 9.2wt%, the rest is SiO 2 , CaO and other impurities; the fixed carbon content of the coal powder is 71.2wt%, the sulfur content is 0.5wt%; the calcium ferrite content in the additive is 95.2wt%.

[0032] 5.0% of the amount of slag is pre-loaded into the empty slag tank in the steelmaking area, and then the steelmaking slag is injected into the slag when the slag is d...

Embodiment 3

[0034] Use a mixer to mix high-speed iron red mud, coking dust, and calcium ferrite powder in proportion and mix evenly, then use a ball press to make a 10-30mm red mud agglomerate, and wait for the agglomerate to dry to a moisture content of ≤ 3% before use. The proportion of calcium ferrite powder is 9.5wt%, and the rest is high-iron red mud and coking dedusting ash. The molar ratio of fixed carbon content in coking dedusting ash to oxygen content of iron oxide in high-iron red mud is C / O=1.3. The chemical composition of high-iron red mud in this embodiment is mainly: Fe 2 o 3 52.4wt%, Al 2 o 3 17.9wt%, Na 2 O is 5.2wt%, the rest is SiO 2 , CaO and other impurities; the fixed carbon content of the coking dust removal ash is 82.2wt%, the sulfur content is 0.7wt%; the calcium ferrite content in the additive is 96.1wt%.

[0035] 4.0% of the amount of slag in the empty slag tank in the iron-making area is pre-filled with red mud lumps, and then the blast furnace slag is inj...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B3/04C22B1/248C22B5/10
CPCC21B3/04C22B1/248C22B5/10Y02W30/50
Inventor 张伟张立国王再义任伟童晓宇李金莲邓伟王相力韩子文王亮
Owner ANGANG STEEL CO LTD
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