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Method for washing 4A zeolite crystal

A washing method and zeolite technology, which are applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of polluting environmental resources, difficult reuse and waste of waste water, etc., and achieve water resources conservation and economic benefits. and the effect of significant social benefits and lower production costs

Active Publication Date: 2005-10-26
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Taking the existing process as an example, if the pH value of each ton of zeolite is lowered to below 11, 4 to 6 tons of deionized water above 80°C are required. It is difficult to reuse these waste water, and discharge as waste liquid will not only pollute the environment but also cause waste of resources. waste

Method used

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  • Method for washing 4A zeolite crystal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The washing method of the 4A zeolite crystallization of the present invention comprises static washing and stirring washing, and carbon dioxide gas is added to the stirring liquid to prepare a circulating stirring liquid, and in the stirring liquid: N T 9g / l, N C -N T =3g / l (sodium carbonate 10g / l, sodium bicarbonate 4.5g / l), L / S=4, the washing temperature of the stirring solution is 20±5°C.

[0016] Follow the steps below for washing:

[0017] (1) statically wash the unwashed filter cake with 1 times normal temperature industrial demineralized water on the belt filter machine with 4A zeolite dry base as the base;

[0018] (2) Send the filter cake after static washing into the stirring tank for stirring.

[0019] The press filter cake after stirring and washing is dried to obtain 4A zeolite product, and the filtrate is returned to the stirring washing tank, and is recycled by adding carbon dioxide gas.

Embodiment 2

[0021] The washing method of the 4A zeolite crystallization of the present invention comprises static washing and stirring washing, and carbon dioxide gas is added to the stirring liquid to prepare a circulating stirring liquid, and in the stirring liquid: N T 11g / l, N C -N T =3.5g / l (sodium carbonate 12g / l, sodium bicarbonate 5g / l), L / S=3.5, the washing temperature of the stirring liquid is 25±3°C.

[0022] Follow the steps below for washing:

[0023] (1) statically wash the unwashed filter cake with 1.5 times normal temperature industrial demineralized water based on the 4A zeolite dry basis on the belt filter;

[0024] (2) Send the filter cake after static washing into the stirring tank for stirring.

[0025] The press filter cake after stirring and washing is dried to obtain 4A zeolite product, and the filtrate is returned to the stirring washing tank, and is recycled by adding carbon dioxide gas.

Embodiment 3

[0027] The washing method of the 4A zeolite crystallization of the present invention comprises static washing and stirring washing, and carbon dioxide gas is added to the stirring liquid to prepare a circulating stirring liquid, and in the stirring liquid: N T 10g / l, N C -N T =4g / l (sodium carbonate 11g / l, sodium bicarbonate 6g / l), L / S=4, and the washing temperature of the stirring solution is 22±5°C.

[0028] Follow the steps below for washing:

[0029] (1) statically wash the unwashed filter cake with 1 times normal temperature industrial demineralized water based on the 4A zeolite dry base on the belt filter;

[0030] (2) Send the filter cake after static washing into the stirring tank for stirring.

[0031] The press filter cake after stirring and washing is dried to obtain 4A zeolite product, and the filtrate is returned to the stirring washing tank, and is recycled by adding carbon dioxide gas.

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Abstract

The present invention relates to a crystal washing method used in the production process of 4A zeolite, including static washing and agitator washing. It is characterized by that in the washing liquor the carbon dioxide gas is introduced, in particular, in the agitator washing liquor the carbon dioxide gas is introduced, the agitator washing liquor can be circularly used. In the agitator washing liquor controlling, Nt is 9-12 g / l and Nc-Nt=3-6 g / l.

Description

technical field [0001] The invention relates to a washing method for 4A zeolite crystals, which is used for the crystal washing method in the production process of 4A zeolite. Background technique [0002] 4A zeolite is a product with a wide range of uses. It is widely used in construction, chemistry, chemical industry and daily life. The biggest use of 4A zeolite is as a detergent builder, which can prevent the active components in the detergent from combining with calcium and magnesium ions in water. It loses its activity and protects the active components in the detergent to play normally. It is an important green environmental protection product to prevent washing water from polluting rivers and lakes. [0003] The production of 4A zeolite for detergents at home and abroad is mainly synthesized by hydrothermal synthesis in an alkaline environment, and the synthesized 4A zeolite must be washed with hot water to remove the attached alkali. Taking the existing process as a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14
Inventor 孟令利李鹏王忠慧韩辉文钦果赵善雷
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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