Technique for synthesizing 4A zeolite for detergent by using economic aluminum source

A synthetic detergent and economical technology, applied in the directions of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc., can solve the problems of increased b value of zeolite products, difficult to remove, process waste, etc., and achieve economic benefits Significant social benefits, reducing waste liquid efflux, and reducing production costs

Active Publication Date: 2008-09-17
中铝山东新材料有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low silicon content in the sodium aluminate solution without silicon removal, the production capacity of 4A zeolite is low, resulting in a great waste of subsequent processes in the production of 4A zeolite
Moreover, a large part of the aluminum source in the sodium aluminate solution without silicon removal has not been utilized, resulting in waste of raw materials
[0004] The sodium aluminate solution without silicon removal contains a relatively high content of organic complex iron. Due to the strong adsorption of 4A zeolite, the organic complex iron is tightly adsorbed during the crystallization process of 4A zeolite. on its surface, and difficult to remove
This directly leads to an increase in the b value of zeolite products, which seriously affects the chromaticity of 4A zeolite products, and thus affects the use of 4A zeolite products by downstream users
The Chinese patent No. 200410155443.4 uses the

Method used

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  • Technique for synthesizing 4A zeolite for detergent by using economic aluminum source
  • Technique for synthesizing 4A zeolite for detergent by using economic aluminum source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Solution A:

[0019] Take the sodium aluminate solution that has not been desiliconized in the alumina production process, and use 4A zeolite mother liquor to prepare it into Al 2 o 3 The content is 65g / L. Add milk of lime with a total amount of 1.0‰ and 3.0‰ (the volume percentage of the sodium aluminate solution that has not been desiliconized after the preparation, the same below) in two separate additions to the qualified solution, and the amount added each time It is 50% of the total volume, that is, after the prepared sodium aluminate solution is qualified, add 50% milk of lime, filter, add the remaining 50% milk of lime to the filtrate, and filter again. The temperature of the filtrate was controlled at 65°C and was ready for use.

[0020] Solution B:

[0021] Prepare industrial raw water glass (M=2.0-3.1), and control the temperature at 45° C. for use.

[0022] The above two solutions were injected into the synthesis reactor synchronously through two meteri...

Embodiment 2

[0029] Except that the way of adding the amorphous directing agent is different from that in Example 1, the rest of the steps and experimental conditions are the same as in Example 1. The amount of amorphous directing agent added is 3‰ of dry basis zeolite weight, and 0.56m 3 The flow rate of / h is injected into the crystallization reactor synchronously with the synthesized gel, and then the crystallization is carried out by raising the temperature.

[0030] The experimental results are listed in the table below.

[0031] Total amount of milk of lime added Calcium exchange D50

[0032] Sample number b value Crystallinity (%)

[0033] (‰) (mgCaCO 3 / g-Z) (μm)

[0034] Sample 11.0 310 2.43 0.51 86.5

[0035] Sample 23.0 311 2.40 0.42 87.2

[0036] SME pictures of obtained 4A zeolite products are shown in figure 2 .

Embodiment 3

[0038] The 4A zeolite process for synthesizing detergents using economical aluminum sources of the present invention adopts the sodium aluminate solution that has not removed silicon in the alumina production process and the 4A zeolite for industrial water glass synthesizing detergents, wherein:

[0039] The sodium aluminate solution that has not been desiliconized is prepared with the mother liquor produced in the production of zeolite, so that after the preparation, the Al 2 o 3 The content is 80g / L. Add 4‰ of the sodium aluminate solution volume of lime milk to the sodium aluminate solution after preparation. The solid content is 200g / L. The lime milk is added in two times. The first time is to use the zeolite mother liquor to prepare Qualified solution is added, which is 50% of the total volume of milk of lime, and the second time is added to the filtrate after filtration, and then filtered.

[0040]The amorphous directing agent is added in a continuous way, and the amoun...

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Abstract

The invention relates to a technology using economical aluminum source to synthesize detergency 4A zeolite. The method making use of reaction of aluminum source and silicon source produces gel and get a 4A zeolite product after crystallization. The method is characterized in that the detergency 4A zeolite is synthesized from silicon sodium aluminum solution in alumina production process and industrial water glass. The method using economical aluminum source to synthesize detergency 4A zeolite has the advantages of convenience and simplicity, low cost and good product quality and can satisfy large scale and continuous production and can be achieved at prior 4A zeolite production line without adding any equipment; since the method makes use of crystallization mother liquor back to blend water glass and blending liquid, the method minimizes the waste efflux; the obtained product can not only satisfy the detergent requirements of the customers but also the needs of high-molecular sieve customers; compared with the prior art of 4A zeolite, the product cost can be reduced by about 200 Yuan per ton; therefore, the method has significant social and economical benefits and great practical significance.

Description

technical field [0001] The invention relates to a 4A zeolite process for synthesizing detergent with economical aluminum source. Background technique [0002] 4A zeolite is widely used in phosphorus-free detergents because of its high ion-exchange capacity, comprehensive performance of washing aid, safety and economy, and other excellent characteristics. It mainly uses refined sodium aluminate solution in the alumina production process and industrial water glass to hydrothermally synthesize 4A zeolite. The cost of sodium aluminate solution after desiliconization and fine filtration is relatively high, which reduces the profit margin of 4A zeolite and is difficult to meet Further production needs of zeolite 4A. [0003] Chinese Patent No. 200410155443.4 adopts the method of directly synthesizing 4A zeolite by adding an amorphous directing agent to the sodium aluminate solution without silicon removal, and directly Production of 4A zeolite. However, due to the low silicon c...

Claims

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Application Information

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IPC IPC(8): C01B39/14
CPCC01B39/14
Inventor 杜善国赵善雷张华成宝武蔡转红
Owner 中铝山东新材料有限公司
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