Preparation method and application of desiliconized fly ash

A technology for fly ash and desilication, which is applied in chemical instruments and methods, preparation of alkali metal aluminate/alumina/aluminum hydroxide, inorganic chemistry, etc. High desiliconization efficiency, reduced equipment investment cost, and low acid loss

Inactive Publication Date: 2018-07-17
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, various colleges and scientific research units in my country have actively carried out research on the resource utilization process of high-alumina coal gangue, mainly to make use of its high-alumina and high-silicon resource endowment, and the extraction of alumina is an important direction of its application. However, due to the low initial aluminum-silicon ratio of high-alumina coal gangue, it cannot be directly used for alumina production, so it must be pre-desiliconized before it can be used.
The existing pre-desilication treatment technology basically adopts the method of directly adding lye and high-aluminum fly ash under medium pressure conditions for pre-desilication. The efficiency of silicon is not high, which has a great impact on the technical indicators of subsequent production processes, and there are problems such as high primary investment and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]The preparation method of the present embodiment desiliconization fly ash comprises the steps:

[0041] 1) Mechanical activation

[0042] Take 200 grams of high-alumina coal gangue and take it out after ball milling for 2.0 hours to obtain high-alumina coal gangue powder. After testing, the average particle size of the high-alumina coal gangue powder is 15.64 μm;

[0043] 2) Calcination treatment

[0044] Putting the high-alumina coal gangue powder in step 1) into a muffle furnace for calcination to obtain high-alumina fly ash;

[0045] Wherein, the temperature of the calcination treatment is 950° C., and the time of the calcination treatment is 1.0 h;

[0046] The obtained high aluminum fly ash was tested and the results were as follows:

[0047] The mass content of alumina is 49.25%;

[0048] The mass content of silicon oxide is 40.98%;

[0049] The aluminum-silicon ratio is 1.20;

[0050] 3) acid treatment

[0051] Mix the high-aluminum fly ash in step 2) with ...

Embodiment 2

[0064] The preparation method of the present embodiment desiliconization fly ash comprises the steps:

[0065] 1) Mechanical activation

[0066] Take 200 grams of high-alumina coal gangue, and take it out after ball milling for 3.0 hours with a ball mill to obtain high-alumina coal gangue powder. After testing, the average particle diameter of the high-alumina coal gangue powder is 9.48 μm;

[0067] 2) Calcination treatment

[0068] Putting the high-alumina coal gangue powder in step 1) into a muffle furnace for calcination to obtain high-alumina fly ash;

[0069] Wherein, the temperature of calcination treatment is 1000°C, and the time of calcination treatment is 1.5h;

[0070] The obtained high aluminum fly ash was tested and the results were as follows:

[0071] The mass content of alumina is 49.25%;

[0072] The mass content of silicon oxide is 40.98%;

[0073] The aluminum-silicon ratio is 1.20;

[0074] 3) acid treatment

[0075] Mix the high-alumina fly ash in st...

Embodiment 3

[0088] The preparation method of the present embodiment desiliconization fly ash comprises the steps:

[0089] 1) Mechanical activation

[0090] Take 200 grams of high-alumina coal gangue, and take it out after ball milling for 1.0 h to obtain high-alumina coal gangue powder. After testing, the average particle diameter of the high-alumina coal gangue powder is 23.15 μm;

[0091] 2) Calcination treatment

[0092] Putting the high-alumina coal gangue powder in step 1) into a muffle furnace for calcination to obtain high-alumina fly ash;

[0093] Among them, the temperature of calcination treatment is 1020°C, and the time of calcination treatment is 1.0h;

[0094] The obtained high aluminum fly ash was tested and the results were as follows:

[0095] The mass content of alumina is 49.25%;

[0096] The mass content of silicon oxide is 40.98%;

[0097] The aluminum-silicon ratio is 1.20;

[0098] 3) acid treatment

[0099] Mix the high-aluminum fly ash in step 2) with 800ml...

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Abstract

The invention provides a preparation method and application of desiliconized fly ash. The preparation method comprises the following steps that 1) ball milling treatment is conducted on high-aluminumcoal gangue to obtain high-aluminum coal gangue powder; 2) the coal gangue powder is calcined to obtain high-aluminum fly ash; 3) the high-aluminum fly ash and an acid treatment agent solution are mixed for acid treatment, and a filter cake is filtered and washed to obtain acid-treated fly ash; 4) the acid-treated fly ash and a sodium hydroxide solution are mixed for pre-desiliconization treatment, and a filter cake is filtered and washed to obtain the desiliconized fly ash, wherein the aluminum-silicon ratio of the desiliconized fly ash is 3.2-3.8. By means of the preparation method, the desiliconized fly ash with the aluminum-silicon ratio of 3.2-3.8 is prepared with the coal gangue as a raw material, the preparation process is simple and easy to operate, and the preparation cost is low.

Description

technical field [0001] The invention relates to a preparation method and application of desiliconized fly ash, and belongs to the field of resource utilization of high-alumina coal gangue. Background technique [0002] Coal gangue is a kind of black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. It is mixed in coal seams and discharged as a solid waste in the coal mining process. The accumulated coal gangue accumulated for many years occupies a large amount of land and affects the local ecological environment. If it is not utilized, it will cause long-term huge damage to the environment. [0003] With the increasing shortage of bauxite resources in our country, the use of fly ash, coal gangue and other industrial solid wastes to extract alumina has attracted more and more attention. Due to the special geological background, the Late Paleozoic coal seams and gangue in the Ordos Basin are rich in bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/06C01F7/08
CPCC01F7/0693C01F7/08
Inventor 洪景南孙俊民高志军朱应宝胡剑陈雄兵许学斌王勇
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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