System and method for producing sodium carbonate by using carbon dioxide and carbide slag in boiler flue gas

By using the system of producing soda ash from carbon dioxide and calcium carbide slag in boiler flue gas, the problem of large consumption of limestone and coke in the production of soda ash by ammonia alkali method is solved, and efficient utilization of carbon dioxide and calcium carbide slag is achieved, reducing production energy consumption and carbon emissions.

CN119706880APending Publication Date: 2025-03-28INNER MONGOLIA LANTAI IND +1
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Patent Information

Application Number
CN202510004338.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-02
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the existing soda ash production process of ammonia alkali method, limestone and coke consume a large amount, and the carbon dioxide in the boiler flue gas cannot be effectively utilized, resulting in high carbon emissions and production energy consumption.

Method used

By using carbon dioxide and calcium carbide slag in boiler flue gas to produce soda ash, including CO2 compression unit, calcium carbide slag lime milk unit, carbonization tower and ammonia distillation unit, CO2 purification and efficient utilization of calcium carbide slag are achieved.

Benefits of technology

It reduces the consumption of limestone and coke, reduces production energy consumption, and increases the utilization value and consumption of calcium carbide slag, realizes carbon sequestration in soda ash products, and reduces CO2 emissions.

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Abstract

The invention discloses a system and a method for producing sodium carbonate by using carbon dioxide and carbide slag in boiler flue gas, the boiler flue gas discharged by a coal-fired boiler is purified and then enters a carbonization tower instead of part of lime kiln gas to react with ammoniacal salt water to generate NaHCO3, the NaHCO3 is calcined to generate a final product sodium carbonate, carbon is fixed to the final product, and the emission of CO2 is reduced; and meanwhile, the consumption of CO2 generated by calcining the limestone is reduced, so that the consumption of the limestone and the coke is greatly reduced. Calcium carbide slag generated by a calcium carbide method PVC production device is ground and screened to obtain coarse powder, fine powder and superfine powder, the coarse powder, the fine powder and the superfine powder are mixed in proportion to obtain a calcium carbide slag powder mixture with reasonable grain size distribution, the mixture is used for preparing lime milk, lime milk meeting the ammonia distillation requirement of a sodium carbonate system can be prepared without adding quick lime, the lime milk is used for the ammonia distillation system, and the production cost is reduced. Lime milk notches caused by reduction of lime yield are supplemented, and meanwhile, the utilization value of the solid waste carbide slag is improved.
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