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Preparation method for desiliconized fly ash

A technology of fly ash and high-aluminum fly ash, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of large impact on production process technical indicators, high primary infrastructure investment, and low desiliconization efficiency, and achieve desiliconization High efficiency, realizing resource utilization, and improving the ratio of aluminum to silicon

Inactive Publication Date: 2018-11-16
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

At present, the aluminum-silicon ratio of desiliconized fly ash can only reach about 2.0, and the desiliconization efficiency is not high, which has a great impact on the technical indicators of subsequent production processes, and there are problems such as high infrastructure investment and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In the present embodiment, the preparation method of desiliconized fly ash comprises the following steps:

[0051] 1) acid treatment

[0052] 200 grams of high-alumina fly ash (the average particle size is 45.682 μm; the mass content of aluminum oxide is 49.13%; the mass content of silicon oxide is 41.28%; the aluminum-silicon ratio is 1.19) with a volume of 600mL and a mass concentration of 15.0% The sulfuric acid aqueous solution was mixed, and reacted at a temperature of about 80°C for about 1.5 hours.

[0053] After the acid treatment, the obtained reaction product was subjected to vacuum filtration, and the filter cake was washed with tap water with a volume of 220 mL and a temperature of about 90° C. to obtain acid-treated fly ash.

[0054] Collect the filtrate from the vacuum filtration and the lotion from the filter cake washing in the above process, and use it as an acid treatment agent after solidified alumina and concentrated acid supplementation.

[0055] ...

Embodiment 2

[0065] In the present embodiment, the preparation method of desiliconized fly ash comprises the following steps:

[0066] 1) acid treatment

[0067] Get 200 grams of high-alumina fly ash (the average particle diameter is 51.266 μm; the mass content of aluminum oxide is 48.34%; the mass content of silicon oxide is 42.41%; the aluminum-silicon ratio is 1.14) and the volume is 700mL, and the mass concentration is 8.5% Aqueous hydrochloric acid solution was mixed and reacted at a temperature of about 90° C. for about 3.0 hours.

[0068] After the acid treatment, the resulting reaction system was separated by vacuum filtration, and the filter cake was washed with tap water with a volume of 240 mL and a temperature of about 90°C to obtain acid-treated fly ash.

[0069] The filtrate and lotion in the above process are collected, and after solidified alumina and concentrated acid supplementation, they are recycled as acid treatment agents.

[0070] 2) One-time normal pressure pre-de...

Embodiment 3

[0080] In the present embodiment, the preparation method of desiliconized fly ash comprises the following steps:

[0081] 1) acid treatment

[0082] Get 200 grams of high-alumina fly ash (the average particle diameter is 38.456 μ m; the mass content of aluminum oxide is 47.65%; the mass content of silicon oxide is 42.52%; the aluminum-silicon ratio is 1.12) mix with 800mL acid treatment agent and carry out acid treatment, The temperature of acid treatment is about 95°C, and the time is about 2.5h.

[0083] Wherein, the above-mentioned acid treatment agent is a mixed solution of 300 mL of sulfuric acid aqueous solution with a mass concentration of 15% and 500 mL of an aqueous hydrochloric acid solution with a mass concentration of 8%.

[0084] After the acid treatment, the resulting reaction system was separated by vacuum filtration, and the filter cake was washed with tap water with a volume of 230 mL and a temperature of about 90° C. to obtain acid-treated fly ash.

[0085]...

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Abstract

The invention provides a preparation method for desiliconized fly ash. The preparation method comprises the following steps: 1) performing acid treatment on high-aluminum fly ash, performing filtering, and washing a filter cake to obtain acid-treated fly ash; 2) performing normal-pressure pre-desiliconization treatment on the acid-treated fly ash by adopting a first alkali solution, performing filtering, and washing a filter cake to obtain primary-desiliconization fly ash; and 3) performing normal-pressure pre-desiliconization treatment on the primary-desiliconization fly ash by adopting a second alkali solution, performing filtering, and washing a filter cake to obtain the secondary-desiliconization fly ash, wherein a concentration of the first alkali solution is smaller than a concentration of the second alkali solution. The preparation method provided by the invention can greatly improve an aluminum-silicon ratio of the desiliconized fly ash, wherein the aluminum-silicon ratio can reach 2.7-3.0; and the preparation method has the advantages of a simple process, low energy consumption and low investment costs.

Description

technical field [0001] The invention relates to a method for preparing desiliconized fly ash, which belongs to the field of resource utilization of high-aluminum fly ash. Background technique [0002] With the increasing shortage of high-grade bauxite resources in my country, the process of extracting alumina from industrial solid waste such as fly ash and coal gangue has been paid more and more attention. Due to the special geological background, the Late Paleozoic coal seams and gangue in the Ordos Basin are rich in boehmite and kaolinite and other minerals. In the fly ash produced after combustion, the alumina content is even as high as about 50%, which is equivalent to the middle grade The content of alumina in bauxite is equivalent, and it is a very valuable raw material for alumina production. According to statistics, the potential reserves of high-aluminum coal in the central and western regions of Inner Mongolia are as high as 18 billion tons. Therefore, the compre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 洪景南孙俊民高志军张永珍朱应宝胡剑
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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