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Method for preparing 4A zeolite from red mud solution and bauxite chemical desilication solution

A technology of bauxite and lotion, applied in the direction of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc., can solve the problem of high cost of raw materials, achieve simple preparation process, good economic benefits, and promote popularization and application Effect

Inactive Publication Date: 2019-11-15
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Chinese patent CN106892438A introduces a method for synthesizing 4A zeolite using sodium aluminate solution and sodium silicate solution. The raw materials are all pure industrial reagents, and the raw material cost for preparing 4A zeolite is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Raw material treatment: take the red mud washing liquid and the bauxite chemical desiliconization solution in the alumina production process, and filter the two solutions respectively. After filtering, the components of the two liquid raw materials respectively meet: a. Red mud washing liquid: Na 2 O concentration is 60~90g / L, Al 2 o 3 Concentration is 60~90g / L, solution α K 1.50~1.70; b. Bauxite chemical desiliconization solution: SiO 2 Concentration is 30~50g / L, Na 2 O concentration is 80-100g / L;

[0029] 2) Condition control of hydrothermal synthesis: with n(SiO 2 / Al 2 o 3 )=2.0; n(Na 2 O / SiO 2 )=3.0; n(H 2 O / Na 2 O)=40 ingredients; crystallization temperature 95°C, crystallization time 6h; aging temperature 75°C, aging time 2h;

[0030] 3) Hydrothermal synthesis process: Take the red mud lotion a and the chemical desiliconization solution b according to the ingredients described in 2), and slowly add b to the beaker containing the a solution, and at ...

Embodiment 2

[0034] 1) raw material processing: as described in step 1) in embodiment 1);

[0035] 2) Condition control of hydrothermal synthesis: with n(SiO 2 / Al 2 o 3 )=2.0; n(Na 2 O / SiO 2 )=2.6; n(H 2 O / Na 2 O)=40 ingredients; crystallization temperature 95°C, crystallization time 6h; aging temperature 75°C, aging time 2h;

[0036] 3) Hydrothermal synthesis process: the same as step 3 in Example 1);

[0037] 4) Subsequent processing: the same as step 4) in Example 1.

[0038] The particle size D50 (um) of the obtained 4A zeolite powder was 2.08, and the calcium ion exchange capacity was 312 mg / g.

Embodiment 3

[0040] 1) raw material processing: as described in step 1) in embodiment 1);

[0041] 2) Condition control of hydrothermal synthesis: with n(SiO 2 / Al 2 o 3 )=2.0; n(Na 2 O / SiO 2 )=2.2; n(H 2 O / Na 2 O)=40 ingredients; crystallization temperature 95°C, crystallization time 6h; aging temperature 75°C, aging time 2h;

[0042] 3) Hydrothermal synthesis process: the same as step 3 in Example 1);

[0043] 4) Subsequent processing: the same as step 4) in Example 1.

[0044]The particle size D50 (um) of the obtained 4A zeolite powder was 2.21, and the calcium ion exchange capacity was 329 mg / g.

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Abstract

The invention discloses a method for preparing 4A zeolite from a red mud solution and a bauxite chemical desilication solution. According to the method, by using the red mud solution and the bauxite chemical desilication solution as main raw materials, controlling the proportion of the raw materials and using specific technical parameters and steps, the 4A zeolite is synthesized by using a hydrothermal method. By means of the method, economical and efficient utilization of the red mud solution and the bauxite chemical desilication solution are achieved, the method has the advantages that the cost of the raw materials is low, the technical process is simple, continuous production can be achieved, the production process is free of pollution, and the performance of the product is excellent.

Description

technical field [0001] The invention belongs to the fields of environmental protection and chemical industry, and in particular relates to a method for preparing 4A zeolite by using red mud washing solution and bauxite chemical desiliconization solution. Background technique [0002] 4A zeolite is the basic product for the preparation of 3A and 5A zeolite. Type A zeolite is widely used in daily chemical, air separation, petrochemical and many other fields, and it is a product with huge market prospects. Synthesizing 4A zeolite by chemical means is the most mature production method at present, and its raw materials are sodium aluminate solution and sodium silicate solution. Sodium aluminate solution is prepared by redissolving industrial aluminum hydroxide with sodium hydroxide. Sodium silicate solution comes from industrial water glass, and its properties generally need to be adjusted by sodium hydroxide. General chemical companies need to purchase raw materials such as al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14
CPCC01B39/14
Inventor 康少杰齐利娟杨会宾周风江韦舒耀
Owner GUIZHOU BRANCH CHINA ALUMINUM IND