Carbonization crystallization technology in process for producing sodium carbonate through Hou's method

Abstract

The invention relates to a carbonization crystallization technology in the process for producing sodium carbonate through a Hou's method. The technology is characterized in that the technology comprises the following steps: sending an ammonia II mother solution to a carbonization cleaning tower, and countercurrent-contacting and reacting with a cleaning gas output by a sodium carbonate preparation tower to precarbonize; injecting a precarbonization solution to a cleaning pump connected to the carbonization cleaning tower to clean the cycle of the carbonization cleaning tower; sending the precarbonization solution taken from the bottom of the carbonization cleaning tower to a primary crystallizer, cooling the precarbonization solution by allowing it to go through a primary cooler, allowingit to go through a collection tank and then return to the primary crystallizer, sending the generated crystal slurry to a primary thickener by the primary crystallizer to thick, and centrifuging; sending the obtained overflow solution to the soda preparation tower, and countercurrent-contacting and reacting with a transformation gas to prepare soda; sending the solution from the soda preparation tower to a secondary crystallizer, crystallizing again, thickening again, and separating again; and sending parts of the overflow solution to the soda preparation tower, and contacting with the transformation gas to carry out cycle soda preparation. The technology of the invention, which adopts above two-time carbonization two-time crystallization external-cooling process, allows the crystallization residence time of the carbonization tower to be prolonged, the carbonization conversion rate to be improved, the working time of the carbonization tower to be prolonged and the production capacity of the carbonization tower to be increased.

Description

technical field [0001] The invention relates to a soda ash production process by a combined soda method, in particular to a carbonization and crystallization process in the soda ash production process by a combined soda method. Background technique [0002] The carbonization process in the traditional soda ash production process is: first send the ammonia II mother liquor to the carbonization cleaning tower, and countercurrent contact with the cleaning gas from the soda making tower to achieve the purpose of pre-carbonization and cleaning, and the tail gas from the cleaning tower goes to the tail gas purification tower, The bottom of the cleaning tower is taken out from the neutralization pumping soda-making tower and the shift gas is contacted and reacted in the upper part of the soda-making tower in countercurrent to achieve the purpose of carbonization soda-making, and then cooled and crystallized by the cooling water tank at the lower part of the soda-making tower to obt...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a more reasonable process, effectively improve the carbonization conversion rate, increase the production capacity of the carbonization tower, and solve the environmental protection problems of the carbonization tower and the boiling tower. In-process carbonization crystallization process

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