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

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...

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 of directly synthesizing 4A zeolite by adding an amorphous directing agent to the sodium aluminate solution without silicon removal, which cannot effectively solve the problem of rising b value of zeolite products

This will limit the method's practical application in production

[0005] In the existing literature and patents, the amorphous directing agent is generally added at one time before the crystallization of the gel. Due to the unique properties of the gel, this addition method makes it difficult for the amorphous directing agent to disperse evenly in the gel. In the gel, it has a great impact on the consistency of the crystallization process of 4A zeolite, resulting in fluctuations in the calcium exchange capacity index of the product

Moreover, due to the inconsistency in the crystallization process, the 4A zeolite product has defects such as uneven particle size distribution and easy sedimentation of the powder.

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