A method for producing alumina by utilizing high-alumina fly ash

A high-alumina fly ash, alumina technology, applied in chemical instruments and methods, alkali metal aluminate/alumina/aluminum hydroxide preparation, aluminum compounds, etc., can solve the problem of uncertain process reliability and large-scale equipment. Difficulty in chemical process, high investment in acid process equipment, to achieve the effect of reducing production cost and investment in plant construction, easy and feasible industrialization, and realizing comprehensive recycling.

Active Publication Date: 2017-10-31
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 by utilizing high-alumina fly ash
  • A method for producing alumina by utilizing high-alumina fly ash
  • A method for producing alumina by utilizing high-alumina fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]First, the limestone whose composition is shown in Table 2 is crushed to 2-5 mm, and then the ore powder is ground until the particle size is -0.074 mm, accounting for more than 85%. Then add the fly ash and soda ash powder of composition such as table 1 and fully mix, and fly ash, limestone, soda ash are respectively 38 parts by weight, 32 parts by weight and 20 parts by weight, then add lye (the circulating mother liquor that crystallization obtains), Divide the prepared lye into two parts in a ratio of 87:13. The concentration of lye is Na 2 O 550g / L, αk=14. The batching index is: moisture 26%, alkali ratio 1, calcium ratio 1.

[0042] Add the prepared material together with 87% lye into a powerful mixer for thorough mixing, and then use a disc pelletizer to make pellets. 8 ~ 12mm, compressive strength greater than 10N.

[0043] The finished pellets are sintered into sintered pellets through five stages of drying, drying, preheating, sintering and cooling. The tem...

Embodiment 2

[0053] First, the limestone whose composition is shown in Table 2 is crushed to 2-5 mm, and then the ore powder is ground until the particle size is -0.074 mm, accounting for more than 85%. Then add the fly ash and soda ash powder of composition such as table 1 and fully mix, 40 parts by weight of fly ash, 35 parts by weight of limestone, 25 parts by weight of soda ash, then add lye, concentration is Na 2 O 580g / L, αk=20. Ingredients control index, moisture 25%, alkali ratio 1, calcium ratio 1.

[0054] Add the prepared materials together into a powerful mixer for thorough mixing, and then use a disc pelletizer to make pellets. The amount of liquid added to the pellets is lye (volume is 15% of the previous step), and the particle size of the pellets is 16. ~20mm, compressive strength greater than 10N.

[0055] The finished pellets are sintered into sintered pellets through five stages of drying, drying, preheating, sintering and cooling, in which the temperature is controlle...

Embodiment 3

[0062] First, the limestone whose composition is shown in Table 2 is crushed to 2-5 mm, and then the ore powder is ground until the particle size is -0.074 mm, accounting for more than 85%. Then add the fly ash and soda ash powder of composition such as table 1 and fully mix, 43 parts by weight of fly ash, 37 parts by weight of limestone, 25 parts by weight of soda ash, then add lye, concentration is Na 2 O 600g / L, αk=30. Ingredients control index, moisture 23%. , the alkali ratio is 1, and the calcium ratio is 1. Divide the prepared lye into two parts by volume, and divide it in a ratio of 87:13.

[0063] Add the prepared material together with 87% lye into a strong mixer for thorough mixing, and then use a disc pelletizer to make pellets. 20mm, the compressive strength is greater than 10N.

[0064] The finished pellets are sintered into sintered pellets through five stages of drying, drying, preheating, sintering and cooling, in which the temperature is controlled at 130...

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Abstract

The invention provides a method for producing aluminum oxide with high-alumina fly ash. The method includes the following steps that 1, fly ash, sodium carbonate and alkali liquor are added into limestone for burdening, pellets are made with a disc-type pelletizing machine, the finished pellets are baked, dried, preheated, sintered and cooled to be sintered into sintered pellets, the sintered pellets are subjected to dry milling with a vertical mill, water or slag washing water is added for digestion, water or washing water is mixed with slag for dealkalization, digestion liquor is desiliconized, aluminum hydroxide crystal seeds are added for seed decomposition, Al(OH)3 is obtained after decomposition, and aluminum oxide is obtained after roasting; seed decomposition mother liquor is evaporated and desalted in two steps. By means of the method, efficient and comprehensive utilization of fly ash is achieved; calcium silicate byproducts of different specifications can be produced by controlling a burdening formula, sintering conditions and dealkalization conditions, the volume weight can be controlled to be 300-800 kg / m<3>, the calcium silicate byproducts are suitable for building material and soil conditioning respectively, the light weight property of the calcium silicate byproducts can be guaranteed, and the reduction of transport cost can also be guaranteed.

Description

technical field [0001] The invention belongs to the field of solid waste utilization, and in particular relates to a method for producing alumina by utilizing fly ash. Background technique [0002] Due to the special mineralization background, a large amount of aluminum-containing minerals such as boehmite and kaolinite exist in some coal resources in the central and western parts of Inner Mongolia. The coal resources are mainly distributed in Zhungeer Coalfield, Zhuozishan Coalfield and Daqingshan Coalfield, among which the alumina content reaches 9-13%. The alumina content in the fly ash produced after power generation can reach 40-50%, which is a non-traditional bauxite resource. [0003] The annual output of high-alumina coal in the Ordos region of Inner Mongolia alone reaches 120 million tons, and some of the coal is used for power generation to produce nearly 30 million tons of high-alumina fly ash, of which about 14 million tons are stored in Hohhot and Ordos in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/08
CPCC01F7/085
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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