Trona sodium bicarbonate mother liquor resource utilization system and treatment method thereof

Abstract

The invention discloses a trona sodium bicarbonate mother liquor resource utilization system and a treatment method thereof. The system comprises a lime slaking unit, a causticizing reaction unit, a slurry separation unit, a calcium carbonate size stabilization carbonation unit, a calcium carbonate separation and drying unit, a caustic soda evaporation unit and a crystallization separation unit. The lime slaking unit is respectively connected to a quick lime feeding pipeline and the causticizing reaction unit; the causticizing reaction unit is respectively connected to a trona sodium bicarbonate mother liquor feeding pipeline, the lime slaking unit and the slurry separation unit; the slurry separation unit is respectively connected to the causticizing reaction unit, the calcium carbonate size stabilization carbonation unit and the caustic soda evaporation unit; the calcium carbonate size stabilization carbonation unit is respectively connected to a water feeding pipeline, a carbon dioxide feeding pipeline, the slurry separation unit and the calcium carbonate separation and drying unit; the caustic soda evaporation unit is respectively connected to the slurry separation unit and thecrystallization separation unit. The system and method provided by the invention do not produce solid waste, and are trona sodium bicarbonate mother liquor clean production technology.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of trona, and relates to a resource utilization system of trona baking soda mother liquor and a processing method thereof. Background technique [0002] Trona contains a variety of impurities, such as sodium sulfate, sodium chloride, etc. In order to produce the required pure alkali products, the lye must first be prepared, and then the lye must be processed. What method, process, Whether the finished product is soda ash, baking soda or caustic soda depends on the content of each component in the lye. During this process, the mother liquor is recycled, and after the product is extracted, it is reinjected into the mining area to dissolve the trona. However, the salt in trona does not chemically react with carbon dioxide, and remains in the mother liquor of filtered caustic soda, and the mother liquor returns to caustic soda, so that the salt content circulates and accumulates in ...

AI Technical Summary

Problems solved by technology

[0005] 1. The quality of trona products with high salt content does not have a competitive advantage

[0006] 2. The continuous accumulation of sodium chloride in the recycling of mother liquor will eventually affect the normal operation of the production process, resulting in a decrease in output year by year

[0007] 3. The reinjection of high-salt mother liquor in the solution mining method polluted the original trona ore, resulting in a decline in the trona grade

[0008] 4. Sodium chloride itself will accelerate the corrosion and scaling of process equipment

However, the current main production area of ​​trona in our country is Nanyang, Henan Province, which is not a production area of ​​coal, etc., and the conditions for establishing salt pans are not available, which makes the use of the mother liquor produced by baking soda production in the last stage of trona utilization become a problem for our trona utilization. number one problem

[0012] Dong Pengyu (Experimental Research on Membrane Separation in the Recycling of Baking Soda Mother Liquor [D], Beijing University of Chemical Technology, 2013) disclosed a method of using membranes to separate baking soda mother liquor, which uses nanofiltration membranes to separate the salt and alkali of baking soda mother liquor , but the membrane must be replaced after a period of use, which not only produces waste but also increases operating costs

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