A kind of efficient and environment-friendly method for producing washing powder from 4a zeolite slurry

Abstract

The invention relates to a method for producing washing powder from 4A zeolite slurry, which comprises the following steps: mixing industrial aluminum hydroxide and alkali so that the molar ratio of Na2O / Al2O3 is 1:1.0~2.0, and the content of Al2O3 is not less than 50g / L, heating to fully dissolve the above raw materials to obtain sodium aluminate solution; mix the sodium aluminate solution with liquid water glass to make the SiO2 / Al2O3=1.0~2.5 (mass ratio) in the mixed slurry, after conventional slurrying, crystallization 4A zeolite slurry is filtered to obtain the 4A zeolite slurry; the above-mentioned 4A zeolite slurry is settled to a solid content of not less than 200g / L; the washing powder raw material that does not contain alkaline components and 4A zeolite is prepared; the prepared 4A zeolite slurry is mixed with The raw materials of the prepared washing powder are fully mixed and spray-dried to obtain the washing powder. The invention changes the method of adding 4A zeolite to the phosphorus-free washing powder, and directly adds the 4A zeolite in the form of slurry, which can greatly reduce the production cost of the phosphorus-free washing powder.

Description

technical field [0001] The invention relates to a method for producing washing powder, in particular to a method for producing washing powder with 4A zeolite slurry. Background technique [0002] At present, it is unavoidable to add the following raw materials in the industrial production of phosphorus-free washing powder: detergent, 4A zeolite and alkali; the above raw materials are fully mixed in an aqueous solution and spray-dried to finally obtain a finished product. Among them, 4A zeolite is used as soft water aid, and also as adsorbent, dehydrating agent and catalyst. Alkali is used to neutralize acidic detergents and adjust pH. [0003] Because the product needs to be prepared after spray drying, powdery 4A zeolite is often added to reduce excess water during production. Chinese patent CN103865678A discloses a method of adding 4A zeolite powder to the washing powder raw material and mixing it and then spray drying, but in the production process, the 4A zeolite is fi...

AI Technical Summary

Problems solved by technology

Chinese patent CN103865678A discloses a method of adding 4A zeolite powder to the washing powder raw material and mixing it and then spray drying, but in the production process, the 4A zeolite is first prepared as a powder by mixing slurry, crystallizing and spray drying , mixed in the washing powder raw material (wet material) in the later stage, and then sprayed and dried after mixing evenly, resulting in a waste of process, and the amount of water used in the preparation of 4A zeolite could not be used in the subsequent process, which also caused a waste of water resources

Patent CN103113996A discloses the process of directly mixing 4A zeolite powder and other washing powder powders in the drum to prepare washing powder, but because the powder is used, it is not easy to mix evenly, which increases labor intensity; second, it is easy to cause dust pollution , endangering the health of the operator

Patent CN102676326B discloses a method for preparing slurry detergent with 4A zeolite slurry, but the water content of slurry detergent is much higher than that of finished washing powder, so the requirements for 4A zeolite slurry are not high, allowing , bringing in more water; however, when preparing laundry detergent, the increase in moisture in the early stage will increase the cost and waste of resources in the later stage of spray drying, so it is not feasible to directly apply this process to the preparation of laundry detergent

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