Method and device for producing baking soda

Abstract

The invention provides a method and a device for producing baking soda, wherein sodium bicarbonate is added to a dissolving tank to prepare raw material slurry containing a sodium bicarbonate solid, the raw material slurry enters an ammonia still, high temperature solution A1 containing high-concentration sodium bicarbonate and low-concentration sodium carbonate flowing out of the ammonia still fully enters a mixer, and is mixed with low temperature solution A2 containing low concentration sodium bicarbonate in the mixer, a clear liquid at the top of the mixer enters a cooler or a flasher to cool down to obtain the low temperature solution A2, and the low temperature solution (namely A2) enters the mixer; bottom crystal slurry of the mixer is subjected to solid-liquid separation to obtainsolid sodium bicarbonate crystal and filtrate; the solid sodium bicarbonate crystal is sent to a drying process to obtain the target product baking soda; the filtrate is sent to a filtrate barrel, thefiltrate of the filtrate barrel is sent to a carbonization tower, the sodium carbonate in the filtrate and carbon dioxide contained in an industrial gas are carbonized in the carbonization tower, anda reaction liquid flowing out from the carbonization tower is sent to the dissolution tank to complete the circulation of the liquid. The method has the advantages that the process flow is short, theenergy consumption is small, and the operation cost is low.

Description

technical field [0001] The invention belongs to the technical field of chemical production, in particular to a method and device for producing baking soda. Background technique [0002] The industrial production process of baking soda (sodium bicarbonate), such as detergents, food additives, feed additives, pharmaceutical raw materials, ore dressing, metal smelting, etc., with the advancement of technology, the particle size of baking soda has been proposed to be large, uniform, and Requirements for a narrow particle size distribution range. The baking soda with uniform large particles has become the development direction of the baking soda industry. Under the background of times that energy saving, consumption reduction, emission reduction, and environmental protection are paid more and more attention to, developing a more energy-saving and environmentally friendly method for producing baking soda has greater economic and social benefits. [0003] The method of convention...

AI Technical Summary

Problems solved by technology

However, the reaction product sodium bicarbonate is easily precipitated and deposited on the surface of the carbonization tower and cooler due to the large temperature difference during heat exchange, resulting in scarring and blockage of the carbonization tower and cooler, and the crystallization of sodium bicarbonate is fine; the operation cycle is short Basically only 6-8 hours, frequent reversing and car washing, resulting in large fluctuations in the temperature and composition of the mother liquor, making normal production difficult, bringing hidden dangers to the long-term stable operation, and bringing many adverse effects to the production of baking soda, such as: The removal rate of carbon dioxide is low, the crystallization of sodium bicarbonate becomes finer, the salt content of the product baking soda is high, the washing water equivalent increases, the mother liquor expands, etc.

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