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Method and system for processing red mud

A technology of red mud and import, which is applied in the field of red mud treatment, can solve the problems that affect the comprehensive utilization of slag or tailings, the low dealkalization rate, and the direct reduction treatment method of red mud to be studied, so as to prevent the difficulty of discharging and low alkali Metal content, effect of promoting volatilization

Inactive Publication Date: 2016-12-21
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the compactness of the pressed pellets, the alkali metals in the red mud cannot be volatilized after reduction, resulting in a very low dealkalization rate during the direct reduction process, and more than 80% of the alkali metals are left in the pellets, which affects the separation of pellets from slag and iron. Comprehensive Utilization of Rear Slag or Tailings
[0005] Therefore, the direct reduction treatment method of red mud needs to be studied

Method used

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  • Method and system for processing red mud
  • Method and system for processing red mud
  • Method and system for processing red mud

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Experimental program
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Effect test

Embodiment 1

[0066] Utilize the method for the embodiment of the present invention, red mud is processed, and specific method is as follows:

[0067] (1) Crush the high volatile coal powder to 2mm, grind the high fixed carbon coal powder to -0.074mm, dry the red mud and moisten it until the particle size is uniform (-0.043mm accounts for 80%).

[0068] (2) batching the material obtained in step (1), wherein the red mud is 100 parts by weight, mixed with 12% high volatile coal powder, 25% high fixed carbon coal powder, and 8% limestone as an additive , mix the materials evenly, wherein, the fixed carbon content of the high fixed carbon reducing agent is 82%, the volatile content of the high volatile content pulverized coal is 38%, and the total iron content of the red mud is 35%.

[0069] (3) Mix the mixture prepared in step (2), add an appropriate amount of water, and perform wet mixing, and then press balls on rollers under high pressure to obtain pellets.

[0070](4) The pellets are dri...

Embodiment 2

[0074] Utilize the method for the embodiment of the present invention, red mud is processed, and specific method is as follows:

[0075] (1) The high volatile coal powder is crushed to 4mm, the high fixed carbon coal powder is ground to 0.1mm, and the red mud is dried and then moistened to a uniform particle size (-0.043mm accounts for 80%).

[0076] (2) batching the material obtained in step (1), wherein the red mud is 100 parts by weight, mixed with 15% high volatile coal powder, 25% high fixed carbon coal powder, and 8% limestone as an additive , mix the materials evenly, wherein, the fixed carbon content of the high fixed carbon reducing agent is 82%, the volatile content of the high volatile content pulverized coal is 38%, and the total iron content of the red mud is 35%.

[0077] (3) Mix the mixture prepared in step (2), add an appropriate amount of water, and perform wet mixing, and then press balls on rollers under high pressure to obtain pellets.

[0078] (4) The pel...

Embodiment 3

[0082] Utilize the method for the embodiment of the present invention, red mud is processed, and specific method is as follows:

[0083] (1) The high volatile coal powder is crushed to 0.1mm, the high fixed carbon coal powder is ground to 0.074mm, and the red mud is dried and then moistened to a uniform particle size (-0.043mm accounts for 80%).

[0084] (2) batching the material obtained in step (1), wherein the red mud is 100 parts by weight, mixed with 15% high volatile coal powder, 25% high fixed carbon coal powder, and 8% limestone as an additive , mix the materials evenly, wherein, the fixed carbon content of the high fixed carbon reducing agent is 82%, the volatile content of the high volatile content pulverized coal is 38%, and the total iron content of the red mud is 35%.

[0085] (3) Mix the mixture prepared in step (2), add an appropriate amount of water, and perform wet mixing, and then press balls on rollers under high pressure to obtain pellets.

[0086] (4) The...

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Abstract

The invention discloses a method and a system for processing red mud. The method for processing red mud comprises the following steps: mixing red mud and high volatile pulverized coal and high-fixed-carbon pulverized coal so as to obtain a mixture; carrying out molding treatment on the mixture to obtain pellets; carrying out reducing roasting treatment on the pellets in a reducing atmosphere so as to obtain alkali-containing flue gas and metalized pellets; and carrying out slag-iron separation treatment on the metalized pellets so as to obtain iron powder and tailings. According to the method, high volatile pulverized coal and high-fixed-carbon pulverized coal are used as a reducing agent in the red mud reduction process. By high volatility of the pulverized coal, porosity of pellets is increased, reduction of iron oxide and volatilization of alkali metal are promoted, and discharge problem caused by soft melting and bonding of materials is prevented. Thus, metalized pellets with low content of alkali metal and high metallization ratio are obtained.

Description

technical field [0001] The present invention relates to a method for treating red mud and a system for treating red mud. Background technique [0002] Red mud is the most important solid waste generated in the production process of alumina industry. At present, the annual discharge of red mud in China exceeds 30 million tons. Except for a small part used in cement production and brick making, most of them are used in wet open-air dam construction Stockpiling, the cumulative stockpiling of red mud has exceeded 350 million tons. Due to the high alkali content in red mud and the high cost of dealkalization, the application of red mud in cement is limited. [0003] From the perspective of composition, the content of acidic oxides in red mud is particularly high, especially Al 2 o 3 , SiO 2 The content is particularly high, and a large amount of limestone needs to be added as an alkaline flux during the reduction process. When no limestone is added or the amount added is sma...

Claims

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Application Information

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IPC IPC(8): C21B13/00C22B1/02C22B1/24C22B1/00
CPCC21B13/0046C21B13/008C22B1/00C22B1/02C22B1/24
Inventor 古明远王敏王健月曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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