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Method for synthesizing zeolite by circulating fluidized-bed coal ash and bottom ash

A circulating fluidized bed and synthetic zeolite technology, applied in chemical instruments and methods, crystalline aluminosilicate zeolite, A-type crystalline aluminum silicate zeolite, etc., can solve the problem of poor ion exchange performance, complex zeolite conditions, and small specific surface area and other problems, to achieve the effect of improving production capacity ratio, high crystal purity, and high cation exchange capacity

Inactive Publication Date: 2013-07-17
SICHUAN COLLEGE OF ARCHITECTURAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the complex conditions of zeolite synthesized by circulating fluidized bed fly ash in the prior art, low conversion rate, small specific surface area, poor ion exchange performance, and cannot be prepared by circulating fluidized bed bottom ash Insufficiency of zeolite, etc., providing a method for synthesizing zeolite from fly ash and bottom ash of circulating fluidized bed boiler

Method used

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  • Method for synthesizing zeolite by circulating fluidized-bed coal ash and bottom ash

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Effect test

Embodiment 1

[0038] The circulating fluidized bed fly ash and bottom ash from A power plant are selected, the fly ash is screened and decarbonized by a sieving machine, the bottom ash is ground by a ball mill, and then mixed evenly in a dry mixer according to a certain proportion. SiO in the mixture 2 +Al 2 o 3 >80w%, SiO 2 / Al 2 o 3 =1.2 (mass ratio), according to the ratio of liquid to solid 5:1 (weight ratio) to OH - The lye with an ion concentration of 3.2mol / L is mixed. Stir at a temperature of 95° C. at a speed of 50 to 70 r / min, and react for 1 hour in a normal-pressure reaction system. Then continue to stir at a speed of 20-40r / min, and react for 4 hours in an open system at a temperature of 95°C. Dehydration and filtration, repeated washing until pH=9 of the washing solution, collecting solid phase components, drying at 85°C for 3 hours to obtain the A-type zeolite product. The lye is prepared with NaOH and KOH in a molar ratio of 2:1.

Embodiment 2

[0040] The circulating fluidized bed fly ash and bottom ash from A power plant are selected, the fly ash is screened and decarbonized by a sieving machine, the bottom ash is ground by a ball mill, and then mixed evenly in a dry mixer according to a certain proportion. SiO in the mixture 2 +Al 2 o 3 >70w%, SiO 2 / Al 2 o 3 =1.4 (mass ratio), mix liquid to solid 9:1 (weight ratio) with 2.5mol / L NaOH solution. At a temperature of 100°C, stir at a speed of 59-70 r / min, and react in an open system for 2 hours. Then continue to stir at a speed of 20-40r / min, and react in an open system for 6h at a temperature of 100°C. Dehydration and filtration, repeated washing until pH=10 of the washing solution, collecting solid phase components, drying at 100°C for 5 hours to obtain the X-type zeolite product.

Embodiment 3

[0042] The circulating fluidized bed fly ash and bottom ash of B power plant are selected, and the fly ash is screened and decarbonized by a sieving machine, and the bottom ash is ground by a ball mill, and then mixed evenly in a dry mixer according to a certain proportion. SiO in the mixture 2 +Al 2 o 3 >70w%, SiO 2 / Al 2 o 3 =1.7 (mass ratio), according to the ratio of liquid to solid 6:1 (weight ratio), mix with 2.8mol / L NaOH solution. At a temperature of 98°C, stir at a speed of 50-70r / min, and react in an open system for 1.5h. Then continue to stir at a speed of 20-40r / min, and react for 5 hours in an open system at a temperature of 98°C. Dehydration and filtration, repeated washing until pH=10 of the washing solution, collecting solid phase components, drying at 90°C for 4 hours to obtain the P-type zeolite product.

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Abstract

The invention discloses a method for synthesizing zeolite by circulating fluidized-bed coal ash and bottom ash. The method comprises the following steps of: carrying out decarburization treatment on the coal ash by a screening machine and mixing the treated coal ash with the bottom ash which is milled by a ball mill; adding alkali liquor in a liquid-solid weight ratio of (5:1) to (9:1); reacting for 1-2 hours under the condition of 50r / min-70r / min by stirring, and the reaction temperature being 95 DEG C to 100 DEG C, and crystallizing by stirring for 4-6 hours at the speed of 20 revolutions / minute to 40 revolutions / minute and the crystallizing reaction being 95 DEG C to 100 DEG C; washing and crystallizing until the pH value is 9-10, dehydrating and filtering, and drying for 3-5 hours under the condition of 85 DEG C to 100 DEG C to a dried zeolite product with the content of 76w%-81w%. According to the method for synthesizing zeolite by circulating fluidized-bed coal ash and bottom ash disclosed by the invention, the synthesis material coal ash is free of any roasting pre-treatment and calcining pre-treatment; the synthesis process is a hydro-thermal synthesis process under normal pressure; and the obtained zeolite has the characteristics of being high in cation exchange capacity, high in specific surface area and the like.

Description

technical field [0001] The invention relates to a method for synthesizing zeolite from fly ash in a circulating fluidized bed, in particular to a type A, type X and type P zeolite synthesized from fly ash and bottom ash of a circulating fluidized bed boiler and a preparation method thereof. Background technique [0002] Zeolite is a general term for zeolite minerals, which is a hydrous alkali metal or alkaline earth metal aluminosilicate mineral. There are natural and synthetic methods. The traditional method of producing zeolite is to use pure chemical raw materials or natural minerals to synthesize them through complex processes, which consumes a lot of resources and energy. [0003] Fly ash is the fine-grained dispersed residue after pulverized coal is burned. In my country, fly ash is mainly used in cement production, filling, wall materials and other building materials and construction industries. There have been many reports on the synthesis of molecular sieves from f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14C01B39/22C01B39/00B09B3/00C09K17/08C05G3/00
Inventor 杨魁黄之柯罗淳
Owner SICHUAN COLLEGE OF ARCHITECTURAL TECH
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