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4A type molecular sieve and preparation method thereof

A molecular sieve and weight technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of 4A-type molecular sieves with low purity and crystallinity, so as to improve comprehensive utilization value, large economic benefits and Social benefits, the effect of simple steps

Active Publication Date: 2017-10-24
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the 4A-type molecular sieve prepared by the method of the prior art generally has the defects of low purity and crystallinity, therefore, it is necessary to find a new method for preparing the 4A-type molecular sieve that can overcome the above-mentioned defects of the prior art in the art

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  • 4A type molecular sieve and preparation method thereof
  • 4A type molecular sieve and preparation method thereof
  • 4A type molecular sieve and preparation method thereof

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specific Embodiment approach

[0044] According to a preferred embodiment, the method of the present invention comprises:

[0045] 1) reacting fly ash under acidic conditions to obtain a mixture;

[0046] 2) The mixture is filtered to obtain filter residue and AlCl respectively 3 Mother liquor;

[0047] 3) react the filter residue under alkaline conditions to obtain Na 2 SiO 3 Mother liquor;

[0048] 4) the AlCl 3 mother liquor and the Na 2 SiO 3 The mother liquor is mixed and reacted and crystallized in sequence;

[0049] 5) The product obtained after crystallization is successively filtered, washed and dried.

[0050] Each parameter in the above-mentioned preferred embodiment of the present invention is the same as the foregoing description of the present invention, and the present invention will not be repeated here, and those skilled in the art should not understand it as a limitation of the present invention.

[0051] In the second aspect, the present invention provides the 4A molecular sieve ...

Embodiment 1

[0066] 1. Place 100g of fly ash in 400g of 28% by weight hydrochloric acid aqueous solution to react, the reaction temperature is 80°C, and the time is 1h;

[0067] 2. Filter the mixture obtained after the reaction in step 1 to obtain AlCl as the filtrate respectively 3 Mother liquor and the acid-process aluminum extraction residue as filter residue, the composition and content (% by weight) of the acid-process aluminum extraction residue are shown in Table 2, and the AlCl 3 AlCl in mother liquor 3 The content is 225g / L;

[0068] 3. The filter residue was placed in 400 g of aqueous sodium hydroxide solution with a pH value of 12.0 for reaction, wherein the reaction temperature was 70° C. and the time was 0.5 h to obtain Na 2 SiO 3 mother liquor, the Na 2 SiO 3 mother liquor as SiO 2 The calculated content is 130g / L;

[0069] 4, the AlCl 3 mother liquor and the Na 2 SiO 3 The mother liquor is mixed and reacted, and the AlCl 3 Al 2 o 3 Gauge and the Na 2 SiO 3 mot...

Embodiment 2

[0076] 1. Place 100g of fly ash in 400g of 25% by weight hydrochloric acid aqueous solution to react, the reaction temperature is 60°C, and the time is 2h;

[0077] 2. Filter the mixture obtained after the reaction in step 1 to obtain AlCl as the filtrate respectively 3 Mother liquor and the acid-process aluminum extraction residue as filter residue, the composition and content (% by weight) of the acid-process aluminum extraction residue are shown in Table 2, and the AlCl 3 AlCl in mother liquor 3 The content is 218g / L;

[0078] 3. The filter residue was placed in 400 g of aqueous sodium hydroxide solution with a pH value of 13.0 for reaction, wherein the reaction temperature was 60° C. and the time was 1 h to obtain Na 2 SiO 3 mother liquor, the Na 2 SiO 3 mother liquor as SiO 2 The calculated content is 134g / L;

[0079] 4, the AlCl 3 mother liquor and the Na 2 SiO 3 The mother liquor is mixed and reacted, and the AlCl 3 Al 2 o 3 Gauge and the Na 2 SiO 3 mothe...

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Abstract

The invention relates to the field of coal resource utilization and discloses a 4A type molecular sieve and a preparation method thereof. The method comprises the following steps: (1) performing reaction on coal ash under the acidic condition to obtain a mixture; (2) filtering the mixture to obtain filter residue and AlCl3 mother liquid separately; (3) performing reaction on the filter residue under the alkaline condition to obtain Na2SiO3 mother liquid; and (4) performing mixing reaction and crystallization on the AlCl3 mother liquid and the Na2SiO3 mother liquid sequentially. By the method provided by the invention, the 4A type molecular sieve with high purity and crystallization degree can be prepared by treating the coal ash with high price and huge yield by an acid dissolution method.

Description

technical field [0001] The invention relates to the field of coal resource utilization, in particular to a method for preparing a 4A molecular sieve and the 4A molecular sieve prepared by the method. Background technique [0002] Fly ash is the fine-grained dispersed residue after coal or pulverized coal combustion, mainly produced in pulverized coal furnaces and circulating fluidized beds used in power plant production. With the rapid development of the economy and the increase of coal consumption, the emission of fly ash is also increasing day by day. my country is the country with the largest coal consumption in the world, and the discharge of fly ash is even more astonishing. At present, the accumulative stockpile of fly ash in China has reached billions of tons, so the problem of economically and rationally utilizing and consuming fly ash is imminent. [0003] White mud is the residue of alumina extracted from fly ash by one-step acid-dissolving method. Its chemical c...

Claims

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Application Information

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IPC IPC(8): C01B39/14
Inventor 王宝冬张中华孙琦肖永丰
Owner CHNA ENERGY INVESTMENT CORP LTD
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