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Red mud iron selection process

A technology of red mud and iron selection, which is applied in the direction of solid separation, wet separation, chemical instruments and methods, etc., can solve the problems affecting the performance and life of equipment, the reduction of magnetic separation efficiency, and large temperature loss, so as to reduce heat energy loss, Improved operating efficiency and low hydrolysis loss

Inactive Publication Date: 2016-01-06
云南九州再生资源开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This iron selection process has the following defects: (1) The hot water from the hot water station is used for the red mud solid content deployment water and the washing water of the coarse magnetic separator, and the temperature of the hot water and red mud slurry is between 85-90 ℃, while the magnetic separators are all open-air equipment, the temperature of the tailings slurry returned after iron selection is 8℃-10℃ lower than that of the original red mud slurry, and the temperature loss is large. Increased alumina hydrolysis and steam energy consumption; (2) During the magnetic separation process, the temperature of the slurry decreases, causing the alumina in the red mud slurry to precipitate, resulting in serious scarring of the magnetic separator, affecting the performance and life of the equipment, increasing The cost of cleaning scars; (3) The solid content of the red mud slurry needs to be diluted with a large amount of water to a concentration of 15%-25% during magnetic separation. The dilution water in the above process uses hot water from the hot water station, causing the entire magnetic The water used in the selection section is easily restricted by the amount of water in the hot water station of the alumina plant. When the water in the hot water station is insufficient, the red mud slurry cannot be diluted to the corresponding solid content, resulting in a decrease in magnetic separation efficiency.

Method used

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Embodiment 1

[0021] Embodiment 1: as figure 2 As shown, a red mud iron separation process, the operation steps are as follows: first, set the access point of red mud iron separation after the final washing, cut off the red mud discharged from the final washing settling tank, and transport it to the magnetic separation In the workshop, the dense overflow liquid of the tailings from the subsequent circulation of the process is used as the water for adjusting the solid content of the red mud slurry, and the solid content of the red mud slurry is adjusted to 150g / l. Next, a slag separation screen with an aperture of 0.1mm is used Remove the coarse particles in the red mud slurry, and then use the permanent magnet machine to remove the iron filings in the red mud slurry. The strength of the permanent magnet machine is 0.1T; Magnetic separation, the strength of magnetic separation is 0.6T. The tailings from the first magnetic separation enter the tailings concentration workshop and use a thicke...

Embodiment 2

[0022] Embodiment 2: as figure 2 As shown, a red mud iron separation process, the operation steps are as follows: first, set the access point of red mud iron separation after the final washing, cut off the red mud discharged from the final washing settling tank, and transport it to the magnetic separation In the workshop, the dense overflow liquid of the tailings from the subsequent circulation of the process is used as the water for adjusting the solid content of the red mud slurry, and the solid content of the red mud slurry is adjusted to 200g / l. Next, the slag with a pore size of 0.3mm is used Sieve to remove the coarse particles in the red mud slurry, and then use a permanent magnet machine to remove iron filings in the red mud slurry. The strength of the permanent magnet machine is 0.2T; then use a high gradient magnetic separator to conduct the first Secondary magnetic separation, the intensity of magnetic separation is 0.8T, the tailings of the first magnetic separati...

Embodiment 3

[0023] Embodiment 3: as figure 2As shown, a red mud iron separation process, the operation steps are as follows: first, set the access point of red mud iron separation after the final washing, cut off the red mud discharged from the final washing settling tank, and transport it to the magnetic separation In the workshop, the dense overflow liquid of the tailings from the subsequent circulation of the process is used as water to adjust the solid content of the red mud slurry, and the solid content of the red mud slurry is adjusted to 400g / l. Next, the slag with a pore size of 0.5mm is used Sieve to remove the coarse particles in the red mud slurry, and then use a permanent magnet machine to remove iron filings in the red mud slurry. The strength of the permanent magnet machine is 0.3T; then use a high gradient magnetic separator to conduct the first Secondary magnetic separation, the strength of magnetic separation is 2T, the tailings from the first magnetic separation enter t...

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Abstract

The invention discloses a red mud iron selection process, and relates to the field of metallurgical beneficiation, in particular to a process for recovering iron from red mud. A red mud iron selection access point is arranged behind the final washing; and the red mud discharged out from a washing settling tank in the final washing is cut off for rough treatment, finish treatment and sweeping, so that the recovery rate of metal iron from the red mud is increased.

Description

technical field [0001] The invention relates to the field of metallurgical beneficiation, in particular to a process for recovering iron from red mud. Background technique [0002] Red mud is a very fine-grained strong alkaline solid waste produced during the production of alumina from bauxite. For every ton of alumina produced, about 1.5 tons of red mud are produced. At present, the comprehensive utilization rate of red mud in my country is only 4%, and the cumulative stockpiles have exceeded 250 million tons. With the annual increase of alumina production in my country and the gradual decrease of bauxite grade, the annual production of red mud will continue to increase. A large amount of red mud is piled up, which not only occupies land, wastes resources, but also easily causes environmental pollution and potential safety hazards. [0003] my country has conducted a lot of research on how to comprehensively utilize red mud. The technology that has been put into industria...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B1/00
Inventor 冯圣生徐昊李伟黄兆中
Owner 云南九州再生资源开发有限公司