Technological method for preparation of sodium carbonate from sodium sulfate

Abstract

The invention relates to a technological method for preparation of sodium carbonate from sodium sulfate. Sodium sulfate and limestone are adopted as the main raw materials, chlorine ions and ammonia are adopted as the intermedia of the process, and the main products are sodium carbonate and gypsum. The method provided by the invention uses sodium sulfate as the main raw material to produce sodiumcarbonate, the process does not involve ammonia distillation procedure, the system does not discharge wastewater, and the consumption of steam and new water is reduced, great changes occur to the technological process and basic principles, and the raw material utilization rate reaches 98% or above. The method provided by the invention reduces energy consumption, realizes recycling of resources, does not produce wastewater, and can change the existing sodium carbonate production, and at the same time provides a new way for deepening utilization of sodium sulfate and enterprises producing sodiumsulfate waste salt.

Description

technical field [0001] The invention belongs to the soda making industry. Aiming at soda ash production enterprises using sodium sulfate as raw material, it relates to a process for producing soda ash with sodium sulfate as the main raw material in the soda making process. Background technique [0002] The existing ammonia-alkali soda ash production technology, combined soda method and Xinxu method production technology mainly use sodium chloride as raw material. Early enterprises that used sodium sulfate as raw material to produce soda ash have ceased production one after another. The existing soda production technology related to sodium sulfate There are also many reports, but most of them are subject to factors such as high production costs or difficult handling of by-products, resulting in the industrialization of sodium sulfate for soda production without large-scale application. [0003] However, in the production process of ammonia-soda method and Xinxu method, which...

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Problems solved by technology

[0002] The existing ammonia-alkali soda ash production technology, combined soda method and Xinxu method production technology mainly use sodium chloride as raw material. Early enterprises that used sodium sulfate as raw material to produce soda ash have ceased production one after another. The existing soda production technology related to sodium sulfate There are also many reports, but most of them are subject to factors such as high production costs or difficult handling of by-products, resulting in no large-scale application of sodium sulfate industrialized alkali production

[0003] However, in the production process of ammonia-soda method and Xinxu method, which use sodium chloride as raw material, a large amount of steam must be used in the deammonization section, which will produce a large amount of waste water, salt loss and cause environmental pollution.

There are also reports on the domestic technology of using sodium sulfate to treat ammonia distillation waste liquid by ammonia-alkali method, but none of them can solve the problem of wastewater discharge

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