Method for producing baking soda large in particle size

Abstract

The invention discloses a method for producing baking soda large in particle size .The method comprises the following steps that seed crystals are put into a reaction crystallizer; mother liquor is introduced into the reaction crystallizer till the liquor level reaches an alkali liquor circulating outlet, and the solid-to-liquor ratio in the reaction crystallizer is controlled to be (0.05-0.15):1; alkali liquor and carbon dioxide containing mixed gas are introduced into the reaction crystallizer for reacting, meanwhile, the mixed liquor in the reaction crystallizer is circulated to an alkali liquor circulating inlet from the alkali liquor circulating outlet, and an external circulating system is set up; under the action of the external circulating system, baking soda crystals obtained through reacting are suspended in the reaction crystallizer, upper-layer fine grains are discharged to a large production system, lower-layer baking soda crystal slurry is discharged, the discharged lower-layer baking soda crystal slurry is thickened, dried and separated, and the baking soda product large in particle size is obtained .Reacting and crystallizing are integrated, the large-particle baking soda product with the grain size ranging from 20 mesh to 60 mesh can be continuously prepared, cost is low, and technological operation is easy.

Description

technical field [0001] The present invention relates to a kind of method, more particularly, relate to a kind of method of producing large particle size baking soda. Background technique [0002] As an important chemical product, baking soda has been applied to various fields of life such as medicine and chemical industry. With the economic development in recent years, my country has become one of the important countries in the production of baking soda, and the growth rate of baking soda production ranks first in the world every year. [0003] Nowadays, the application field of baking soda in China has gradually expanded from the traditional industry and food industry to feed, medicine and other fields. Among the domestic baking soda consumption, the food industry accounts for 31.01%; the chemical industry accounts for 22.32%. The proportion of the fire protection industry is 15.57%, the proportion of the pharmaceutical industry is 12.79%, the proportion of feed additives ...

AI Technical Summary

Problems solved by technology

However, the crystallizer involved in this method only plays the role of prolonging the crystallization time and increasing the particle size under the action of the seed crystal. The seed crystal added in the crystallizer must be pretreated and ground in advance, and the process requirements are relatively high. So far, there have been no reports of industrial applications in China

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