Method for extracting aluminum oxide from sodium-free desiliconized fly ash

A technology of alumina and fly ash, which is applied in the field of extracting alumina from high-alumina fly ash desodium and desilicate ash, can solve the problem of not fully meeting the requirements of cement raw material components, unable to realize waste resource utilization, and process flow Complicated problems, to achieve the effect of eliminating secondary pollution, good economic benefits, and reducing process flow

Inactive Publication Date: 2010-06-30
SHUOZHOU RUNZE INVESTMENT DEV
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Problems solved by technology

[0005] In this patent application, although the soda lime sintering method can be directly used to effectively recover the Al in the desilication dust after silicon extraction 2 o 3 , but the process is complicated, the energy consumptio

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[0018] Specific implementation method

[0019] The desalination and desilication ash is dried with the waste heat of the rotary kiln exhaust gas. Grind the crushed limestone and digested residue powder to -200 mesh.

[0020] Analyze and determine the content of alumina, silica, iron oxide and titanium oxide in desodium and desilicate ash, limestone powder, digested slag powder and coal used, and obtain dicalcium silicate (C 2 S), seven aluminum twelve calcium (C 12 A 7 ), calcium ferrite (CF) and calcium titanate (CT) calculate the amount of calcium material that needs to be added for saturated calcium blending, and mix the prepared raw meal thoroughly.

[0021] Then learn from the new dry cement production process, put the raw material in a rotary kiln and sinter it at 1360±20℃ for 30 minutes. The firing material exits the kiln at a temperature of about 1000°C, enters the thermal insulation rotary kiln, and keeps it at 630-680°C for 10 minutes. When the temperature drops to ≤630°C,...

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Abstract

The invention relates to a method for extracting aluminum oxide from sodium-free desiliconized fly ash, which comprises the following steps of: taking dried sodium-free desiliconized fly ash, carrying out saturation calcium matching with limestone powder and/or slaking slag powder, sintering at 1330-1390 DEG C, controlling to cool the sintered material to obtain the self-pulverizing material, putting into a Na2CO3 solution to quickly dissolve out aluminum oxide, separating a solid from a liquid, extracting aluminum oxide according to the conventional method, and washing residues to obtain the low-sodium calcium-silicon slag. In the method, sodium-free desiliconized fly ash from which silicon dioxide is extracted and sodium oxide is removed is adopted as the raw material; the limestone sintering process can be used for extracting aluminum oxide, and low-sodium calcium-silicon slag can be obtained after extracting aluminum oxide; and both the aluminum oxide and the low-sodium calcium-silicon slag can be used as the raw materials of cement, thereby thoroughly eliminating secondary pollution.

Description

technical field [0001] The invention belongs to the resource utilization of high-alumina fly ash, and relates to a method for extracting alumina from high-alumina fly ash, in particular to a high-alumina product that has extracted silicon dioxide and removed sodium oxide. A method for extracting alumina from fly ash desodium desilicate ash. Background technique [0002] The fly ash formed by pulverization and combustion of raw coal produced in many coal fields in my country is rich in alumina, Al 2 o 3 The content is higher than 37%, some even as high as 44%, which can be called high aluminum fly ash. This fly ash is rich in Al 2 o 3 In addition, it is also rich in SiO 2 , whose SiO 2 The content is generally between 45 and 50%. Therefore, the aluminum-silicon ratio of this kind of fly ash is relatively low, usually only about 0.8, which is difficult to meet the requirements of aluminum content and aluminum-silicon ratio in aluminum ore resources by traditional alumin...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 秦晋国
Owner SHUOZHOU RUNZE INVESTMENT DEV
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