A method for reprocessing and comprehensive utilization of red mud

A reprocessing and red mud technology, which is applied in sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of unsuitable reduction and sintering red mud, and achieve easy control and reduction of technical parameters Emissions and the effect of reducing production costs

Active Publication Date: 2011-12-28
中铝山东有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The red mud obtained by the reduction sintering method is substantially different from the red mud obtained by the existing sintering method, the Bayer method and the combined method of producing alumina in terms of composition and phase characteristics. The existing sintering method, Bayer method The method of reprocessing and comprehensive utilization of red mud by the method or combined method is not suitable for the red mud of reduction sintering method, therefore, it is necessary to provide a method of reprocessing and comprehensive utilization of red mud suitable for reduction sintering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preliminary Example 1 Preparation of red mud by reduction sintering method

[0035] 1. Calculate according to the 13% iron oxide content contained in bauxite, add reduced coke, and use 1.1 times of the required theoretical carbon content; in the ingredients, according to [N] / [A]=0.9, [N / [F ]=0, [C] / [S-S (石 英) ]=2.0 add soda ash and limestone for batching to obtain mixed raw meal;

[0036] 2. The control particle size of mixed raw material grinding is: d50=30 microns;

[0037] 3. After the mixed raw material is ground, it is added to the kiln for high-temperature firing. During the raw material firing process, the temperature of the firing zone is controlled at 1050 ° C, and the firing zone time is controlled for 1.5 hours;

[0038] 4. Dissolution and separation of high-temperature fired clinker to obtain sodium aluminate solution; high-temperature fired clinker is separated by direct sedimentation method to obtain red mud; after testing, the obtained red mud mainly con...

Embodiment 2

[0039] Preliminary Example 2 Preparation of red mud by reduction sintering method

[0040] 1. Calculate according to the 18% iron oxide content contained in bauxite, add reduced coke, according to the required theoretical carbon content of 1.8 times; in the ingredients according to [N] / [A]=1.2, [N / [F ]=0.1, [C] / [S-S (石 英) ]=2.2 adding soda ash and limestone for batching to obtain mixed raw meal;

[0041] 2. The control particle size of mixed raw meal grinding is: d50=100 microns;

[0042] 3. After the mixed raw material is ground, it is added to the kiln for high-temperature firing. During the raw material firing process, the firing zone temperature is controlled at 1150°C, and the firing zone time is controlled at 0.4hr;

[0043] 4. Dissolution and separation of high-temperature fired clinker to obtain sodium aluminate solution; high-temperature fired clinker was separated by direct sedimentation method to obtain reduction sintering red mud; after testing, the obtained red...

Embodiment 3

[0044] Preliminary Example 3 Preparation of red mud by reduction sintering method

[0045] 1. According to the calculation based on 23% iron oxide contained in bauxite, add reduced coke, according to 1.4 times of the required theoretical carbon content; in the ingredients according to [N] / [A]=1.0, [N / [F ]=0, [C] / [S-S (石英) ]=2.1 adding soda ash and limestone for batching to obtain mixed raw meal;

[0046] 2. The control particle size of mixed raw material grinding is: d50=120 microns;

[0047] 3. After the mixed raw material is ground, it is added to the kiln for high-temperature firing. During the raw material firing process, the firing zone temperature is controlled at 1100 ° C, and the firing zone time is controlled for 1.0 hr;

[0048] 4. Dissolution and separation of high-temperature fired clinker to obtain sodium aluminate solution; high-temperature fired clinker was separated by direct sedimentation method to obtain reduction sintering red mud; after testing, the obtai...

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Abstract

The invention discloses a reprocessing and comprehensive utilization method of red mud, comprising the following steps: (1) carrying out mashing on red mud, and carrying out artificial mineral dressing on heavy mineral to respectively obtain coarse sand and mortar; (2) drying the coarse sand, then carrying out magnetic separating to respectively obtain quartz sand and level 1 magnetic material; (3) carrying out magnetic separating on the level 1 magnetic material to respectively obtain magnetite powder and tailing 1; and (4) putting the mortar in a magnet separator for magnetic separating to respectively obtain fine iron ore and tailing 2. The method is simple and practicable and has the advantages of easily controllable technical parameters, little energy consumption and low cost, can process more than 100 Mtpa per year, reduce the discharging capacity of red mud by 35-70 % and reduced the production cost of alumina. The main products of the method are magnetite powder and quartz, and the obtained two tailings can be used in preparing dry cement or in damming, so that the purpose of comprehensive utilization of red mud is achieved.

Description

technical field [0001] The invention relates to a reprocessing and utilization method of waste in alumina production, in particular to a reprocessing and comprehensive utilization method of red mud, which is waste in alumina production, and belongs to the field of red mud reprocessing. Background technique [0002] Red mud is the waste produced in the process of extracting alumina from bauxite. It is named for its red mud. Red mud is the largest waste produced in the alumina production process, and it is also the largest pollution source of alumina production. Due to the difference in production methods and bauxite grades, about 0.5-2.5 tons of red mud is produced for each ton of alumina produced, and each ton of red mud also has 3-4m 3 alkaline waste liquid. With the continuous development of the bauxite industry, China's red mud discharge is more than 15 million tons per year, and with the new production and the increase and transformation of old equipment, the total amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 高建阳
Owner 中铝山东有限公司
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