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A method for producing alumina from high-alumina fly ash

A high-alumina fly ash and alumina technology, which is applied in chemical instruments and methods, alumina/aluminum hydroxide, aluminum compounds, etc., can solve the uncertain process reliability, difficulty in large-scale equipment, and investment in acid process equipment High-level problems, to achieve the effect of reducing equipment and personnel investment, ensuring light-weight characteristics, and reducing energy consumption

Active Publication Date: 2017-11-03
开曼铝业(三门峡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acid process equipment investment is very high, and the production and maintenance costs are also high, and the production process will also cause greater environmental pressure
Although the ammonium sulfate method overcomes the relative corrosion of equipment and the pressure on the environment, in the case of large-scale production, there are still difficulties in enlarging the equipment, and the production process also needs further exploration, and the reliability of the process is not very sure.
At present, the only process for extracting alumina from fly ash in continuous industrial production in my country is the soda lime sintering method, but due to the high cost, the loss is serious

Method used

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  • A method for producing alumina from high-alumina fly ash
  • A method for producing alumina from high-alumina fly ash
  • A method for producing alumina from high-alumina fly ash

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Process see figure 1 , Firstly crush the limestone with the composition shown in Table 2 to 2-5mm, then grind the ore powder to a particle size of -0.074mm accounting for more than 85%, and crush the coke powder to 1-3mm. Then add the fly ash and soda ash powder with ingredients as shown in Table 1 and mix thoroughly: 38 parts by weight of fly ash, 32 parts by weight of limestone, 20 parts by weight of soda ash, 8 parts by weight of coke powder, and then prepare lye (after two-step evaporation The circulating mother liquor of salt is divided into two parts, the distribution ratio is 87:13, and this step uses 87%), the concentration is Na2O 510g / L, and the causticization coefficient αk=14. The water content of the ingredients is 30%, the alkali ratio is 1, and the calcium ratio is 1.

[0045] Add the prepared materials together with 87% lye to the mixer for the first mixing. Once the mixed materials enter the secondary mixer, the remaining 13% lye is sprayed into the secon...

Embodiment 2

[0056] Firstly, the limestone with the composition shown in Table 2 is crushed to 2-5mm, then the ore powder is ground to a particle size of -0.074mm accounting for more than 85%, and the coke powder is crushed to 1-3mm. , Then add the fly ash and soda ash powder with ingredients as shown in Table 1 and mix thoroughly: 40 parts by weight of fly ash, 35 parts by weight of limestone, 22 parts by weight of soda ash, 10 parts by weight of coke powder, and then add lye, the concentration is Na2O550g / L, αk=20. The obtained ingredients have a moisture content of 28%, an alkali ratio of 1, and a calcium ratio of 1. The circulating mother liquor lye is divided into two parts by volume, the distribution ratio is 87:13, 87% of which is used for ingredients.

[0057] The prepared material is added to the mixer for the first mixing, and the mixed material enters the roller granulator, and at the same time, the remaining 13% lye is sprayed for granulation, and the particle distribution is 1-...

Embodiment 3

[0065] Firstly, the limestone with the composition shown in Table 2 is crushed to 2-5mm, then the ore powder is ground to a particle size of -0.074mm accounting for more than 85%, and the coke powder is crushed to 1-3mm. Then add the fly ash and soda ash powder as shown in Table 1 and mix thoroughly, 43 parts by weight of fly ash, 37 parts by weight of limestone, 25 parts by weight of soda ash, 12 parts by weight of coke powder, and then add the ingredients of lye, the concentration of lye is Na 2 O 600g / L, αk=30. The lye is divided into two parts by volume, and the distribution ratio is 87:13. The obtained ingredients have a moisture content of 26%, an alkali ratio of 1, a calcium ratio of 1, and a coke powder ratio of 12%.

[0066] The prepared material is added to the mixer for the first mixing, and the mixed material enters the roller granulator, and at the same time, the remaining 13% lye is sprayed for granulation, and the particle distribution is 1-8mm. The air permeabil...

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Abstract

The invention provides a method for producing aluminium oxide with high-alumina fly ash. The method comprises the steps of adding the fly ash, sodium carbonate and alkali liquor to limestone for material blending, conducting granulation with a roller granulator, then conducting sintering, adding adjusting liquid to clinker for dissolution, conducting sufficient washing on slag which is dissolved out with hot water, using washing water as dissolution adjusting liquid, adding dilute lye to the slag for dealkalization, conducting desilication on coarse liquid obtained after dissolution of clinker, adding aluminium hydroxide seed crystals to a solution obtained after desilication for seed precipitation decomposition, and conducting evaporation and salt drainage on seed precipitation mother liquor in two steps. By means of the method, efficient and comprehensive utilization of the fly ash is achieved, calcium silicate byproducts of different specifications can be produced by controlling the material blending formula, the sintering conditions and dealkalization conditions, the volume weight can be controlled to be 300-800 kg / m<3>, the method is applicable to building material and soil conditioning, the light characteristic of a building material and soil can be guaranteed, and it can be guaranteed that transportation cost is lowered.

Description

Technical field [0001] The invention belongs to the field of industrial waste utilization, and specifically relates to a method for producing alumina by using high-alumina fly ash. Background technique [0002] Due to the special mineralization background, a large number of aluminum-bearing minerals such as boehmite and kaolinite occur in part of the coal resources in central and western Inner Mongolia. This coal resource is mainly distributed in Zhungeer Coalfield, Zhuozishan Coalfield and Daqingshan Coalfield, in which the alumina content reaches 9-13%. The alumina content of fly ash produced after power generation can reach 40-50%, which is a non-traditional bauxite resource. [0003] The annual output of high-aluminum coal in the Ordos region of Inner Mongolia alone reaches 120 million tons. Some of the coal is used for power generation to produce nearly 30 million tons of high-aluminum fly ash. Among them, about 14 million tons are concentrated in Hohhot and Ordos in the cent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/44C01F7/02C01B33/24
CPCC01B33/24C01F7/02C01F7/441
Inventor 张广麻树春李光柱董凯伟
Owner 开曼铝业(三门峡)有限公司
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