Method for preparing analcite through high-alumina fly ash

A high-alumina fly ash and analcime technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of high procurement cost, non-recyclable lye, and complicated process, so as to reduce production costs and solve human health problems. and environmental hazards, the effect of high purity

Active Publication Date: 2016-01-27
DATANG INT HIGH ALUMINA COAL R & D CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above three raw materials are all chemical raw materials, and there are problems such as high procurement cost, complicated process, and the lye after the synthesis of analcime cannot be reused.

Method used

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  • Method for preparing analcite through high-alumina fly ash

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Embodiment 1

[0034] 1) Pre-desilicate reaction with sodium hydroxide solution and high-alumina fly ash: take 50 grams of high-alumina fly ash with an aluminum-silicon ratio of 1.25, add 200 ml of sodium hydroxide with a sodium oxide concentration of 100 g / L, and place In the reaction kettle, the pre-desilication reaction was carried out at 120°C for 2.0 hours. After the reacted solution was filtered and washed, the liquid phase obtained was the desiliconization lye (the concentration of silicon dioxide was 57.21g / L, and the concentration of sodium oxide was 87.4g / L, alumina concentration 1.53g / L, Na 2 o c concentration 5.8g / L), the solid phase is desiliconized fly ash;

[0035] 2) Add the desiliconized fly ash obtained in 1) to the slurry made of sodium carbonate and limestone to obtain a mixed slurry, sinter the mixed slurry to form clinker, and then go through the clinker dissolution process to obtain a sodium aluminate solution (alumina concentration is 102.36g / L, sodium oxide concent...

Embodiment 2

[0039] 1) Use sodium hydroxide solution and high-alumina fly ash for pre-desilication reaction: take 50 grams of high-alumina fly ash with an aluminum-silicon ratio of 1.17 and add 150 ml of sodium hydroxide with a sodium oxide concentration of 80 g / L, place In the reaction kettle, the pre-desilication reaction was carried out at 120°C for 1.5 hours. After the reacted solution was filtered and washed, the liquid phase obtained was the desiliconization lye (the concentration of silicon dioxide was 49.87g / L, and the concentration of sodium oxide was 76.7g / L, alumina concentration 1.67g / L, Na 2 o c Concentration 6.8g / L), the solid phase is desiliconized fly ash;

[0040] 2) Add the desiliconized fly ash obtained in 1) to the slurry made of sodium carbonate and limestone to obtain a mixed slurry, sinter the mixed slurry to form clinker, and then go through the clinker dissolution process to obtain a sodium aluminate solution (the concentration of aluminum oxide is 95.47g / L, the ...

Embodiment 3

[0043] 1) Pre-desiliconization reaction with sodium hydroxide solution and high-alumina fly ash: take 50 grams of high-alumina fly ash with an aluminum-silicon ratio of 1.06, add 200 ml of sodium hydroxide with a sodium oxide concentration of 110 g / L, and place In the reaction kettle, the pre-desilication reaction was carried out at 130°C for 2.0 hours. After the reacted solution was filtered and washed, the liquid phase obtained was the desiliconization lye (the concentration of silicon dioxide was 60.23g / L, and the concentration of sodium oxide was 85.41g / L, alumina concentration 0.94g / L, Na 2 o c Concentration 7.2g / L), the solid phase is desiliconized fly ash;

[0044] 2) Add the desiliconized fly ash obtained in 1) to the slurry made of sodium carbonate and limestone to obtain a mixed slurry, sinter the mixed slurry to form clinker, and then go through the clinker dissolution process to obtain a sodium aluminate solution (alumina concentration is 110.36g / L, sodium oxide ...

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Abstract

The invention relates to a method for preparing analcite through high-alumina fly ash. The method includes the following steps of firstly, conducting a pre-desiliconization reaction through a sodium hydroxide solution and high-alumina fly ash, and obtaining a solid phase desiliconization fly ash and a liquid phase desiliconization alkali liquid after filtering and washing a reaction solution; secondly, adding desiliconization fly ash obtained in the first step to serous fluid prepared from sodium carbonate and limestone to obtain mixed serous fluid, and obtaining a sodium aluminate solution through sintering and clinker dissolving-out procedures; thirdly, conducting purification and impurity removal on desiliconization alkali liquid obtained in the first step, and mixing and homogenizing alkali liquid and the sodium aluminate solution obtained in the second step, and obtaining analcite through the crystallization reaction, filtering, washing and drying. In the scheme, the solid phase is dried to obtain analcite, and the liquid phase is evaporated and concentrated to return to the pre-desiliconization procedure to the reused. The method has the advantages of being simple in process, low in energy consumption, low in cost, high in raw material utilization rate, high in purity, small in granularity, uniform in granularity, suitable for industrial popularization and the like.

Description

technical field [0001] The invention belongs to the field of high-tech resource utilization of fly ash, relates to the technical fields of environmental materials, chemical industry, metallurgy and the like, and in particular relates to a method for preparing analcime by using high-alumina fly ash. Background technique [0002] The chemical composition of analcime is Na 16 [Al 16 Si 32 o 96 ]·16H 2 O, is a microporous crystalline aluminosilicate mineral with a three-dimensional lattice belonging to the cubic crystal system. Its effective pore size is 0.26nm, and it can be used as a natural microporous adsorbent or a natural ion sieve. Heavy metal ions such as ions and copper ions have a high exchange capacity. Therefore, analcime has a very wide range of uses in the fields of extraction of heavy metal ions, sewage treatment, remediation of heavy metal-contaminated soil, and fine chemicals. [0003] The silicon source used in the existing analcime preparation process is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 洪景南孙俊民高志军杨会宾王娜许学斌
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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