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Method for producing low b-value 4A zeolite

A production method and technology of zeolite, which are applied in the directions of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve problems such as low yield, and achieve the effects of short process flow, improved particle size, and easy washing.

Active Publication Date: 2010-08-11
中铝山东新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We used to start with reducing the red color characteristic of the mother liquor of the Bayer process, adding lime milk, sodium silica slag and other raw materials with good adsorption properties and easy access to decolorize, and then synthesized, with little effect

Method used

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  • Method for producing low b-value 4A zeolite
  • Method for producing low b-value 4A zeolite
  • Method for producing low b-value 4A zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Separation of mother liquor Al in Bayer process 2 o 3 When the concentration is 55g / L, with SiO 2 Continuous co-current synthesis of water glass with a weight concentration of 15%. Before the synthesis, keep the original temperature of the Bayer method seed separation mother liquor at 5-60°C, the water glass temperature is 25-30°C, the slurry ratio is S / A=1.6, and when the stirring speed is 45 rpm, the two The solution is continuously injected into the pulping tank, from the pulping tank into the buffer tank, and then into the belt machine for separation, and then beaten with lotion. The adjusted alkalinity NT is 70g / L. Crystallize at 65°C for 4 hours, crystallize at 75°C for 1 hour, and obtain the product after separation, washing and drying. The results are shown in the table below:

[0025] calcium exchange

[0026] In the table, L, a, and b are representative values ​​of object chromaticity, L represents the light-dark axis, a represents the red-green ...

Embodiment 2

[0028] Separation of mother liquor Al in Bayer process 2 o 3 When the concentration is 55g / L, with SiO 2 Continuous co-current synthesis of water glass with a weight concentration of 25%. Before the synthesis, keep the original temperature of the Bayer process seed separation mother liquor at 55-60°C, the water glass temperature is 25-30°C, the slurry ratio is S / A=1.7, and when the stirring speed is 45 rpm, the two The solution is continuously injected into the pulping tank, from the pulping tank into the buffer tank, and then into the belt machine for separation, and then beaten with lotion. The adjusted alkalinity NT is 90g / L. Crystallize at 65°C for 5 hours, crystallize at 75°C for 2 hours, and obtain the product after separation, washing and drying. The results are shown in the table below:

[0029]

Embodiment 3

[0031] Separation of mother liquor Al in Bayer process 2 o 3 When the concentration is 75g / L, with SiO 2 Continuous co-current synthesis of water glass with a weight concentration of 20%. Before the synthesis, keep the original temperature of the Bayer method seed separation mother liquor at 55-60°C, the water glass temperature is 25-30°C, the slurry ratio is S / A=1.80, and when the stirring speed is 45 rpm, the two The solution is continuously injected into the pulping tank, from the pulping tank into the buffer tank, and then into the belt machine for separation, and then beaten with lotion. The adjusted alkalinity NT is 100g / L. Crystallize at 55°C for 5 hours, crystallize at 75°C for 3 hours, and obtain the product after separation, washing and drying. The results are shown in the table below:

[0032] calcium exchange

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Abstract

The invention relates to a preparation method for 4A zeolite with low b value, wherein, the 4A zeolite prepared by pulpifying and crystallizing the seed pregnant solution of bayer process; the invention is characterized in that the pulpified serous fluid is separated and then washed, and finally is crystallized, wherein, the seed pregnant solution of bayer process is the turn pregnant solution from alumina production with bayer process, and the concentration of Al2O3 is 50 to 100g / L, the weight ratio of SiO2 in the soluble glass concentration is 15 to 30% and the synthesis silica-alumina ratio is 1.5 to 2.1. The method has the advantages of simple and easy operation, low cost and short procedure, thus the product can meet the requirement for application.

Description

technical field [0001] The present invention relates to an improved production method of 4A zeolite, and the obtained 4A zeolite has a low b value. Background technique [0002] 4A zeolite, commonly known as molecular sieve, scientific name sodium aluminosilicate, chemical formula table Na 2 O·Al 2 o 3 2SiO2 2 4.5H 2 O. 4A zeolite is mainly used in the production of non-phosphorous (low) phosphorus washing powder in the detergent industry, and the preparation of raw powder of 3A and 5A molecular sieves. The preparation process is different for different purposes. When used as a detergent builder, 4A zeolite is required to have a higher calcium ion exchange capacity and a higher calcium exchange rate. When used as the raw powder for preparing 3A and 5A molecular sieves, 4A zeolite is required to have higher crystallinity and static water absorption. [0003] There are many methods for synthesizing 4A zeolite, but the hydrothermal synthesis method is mainly used in prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14
Inventor 杜善国刘延东张华宋艳杰蔡转红
Owner 中铝山东新材料有限公司
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