Thermal circulation technology of utilizing sodium sulfate solution or carrier to cogenerate sodium carbonate and ammonium sulfate

Abstract

The invention provides a thermal circulation technology of utilizing sodium sulfate solution or a carrier to cogenerate sodium carbonate and ammonium sulfate. The thermal circulation technology comprises the following steps: regarding an ammonium hydrogen carbonate solution prepared from sodium sulfate, ammonia and carbon dioxide as a raw material to be conducted with a replacement reaction, then carrying out separation to obtain sodium hydrogen carbonate (which can be calcined to obtain a pure alkali product) and an alkali preparing mother solution containing ammonium sulfate, sodium sulfate, ammonium hydrogen carbonate and ammonium carbonate; preheating the alkali preparing mother solution to a high temperature to remove ammonium hydrogen carbonate and ammonium carbonate, and then obtaining the deaminized mother solution containing ammonium sulfate and sodium sulfate; evaporating the deaminized mother solution at a high temperature to obtain sodium sulfate and a niter preparing mother solution; evaporating the niter preparing mother solution at a low temperature to obtain ammonium sulfate and an ammonium preparing mother solution; circulating the sodium sulfate to the replacement reaction working procedure; circulating the ammonium preparing mother solution to the deaminized mother solution high-temperature evaporation working procedure. The main products and byproducts prepared by thermal circulation technology disclosed by the invention are high in quality and added value; the thermal circulation technology is well-adapted in raw materials, low in sodium sulfate theoretical use ratio, production cost and energy consumption, closed circulating, free of three-waste discharge, and capable of saving energy and reducing emission.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry, in particular to a thermal cycle process for co-producing soda ash and ammonium sulfate from sodium sulfate solution or a carrier. Background technique [0002] Sodium Sulfate (Na 2 SO 4 ) is the ionized and generated salt of sulfate and sodium. Sodium sulfate is soluble in water and its aqueous solution is neutral. Soluble in glycerin but not in ethanol. Exposure to air easily absorbs water to form sodium sulfate decahydrate. At 241°C, sodium sulfate will transform into hexagonal crystals. Anhydrous sodium sulfate with high purity and fine particles is called yuanming powder, and sodium sulfate decahydrate is commonly known as mirabilite. [0003] Sodium sulfate widely exists in nature in the form of Glauber's salt, and is a widely used industrial raw material. The main uses are: [0004] 1. In the chemical industry, it is used to manufacture sodium sulfide sodium silicate water...

AI Technical Summary

Problems solved by technology

[0037] Combined method of soda ash (cold combined soda method) needs to use solid sodium chloride as raw material, the cost of raw material is high, the power consumption of cold analysis, salting and crystallization of ammonium chloride is high, and the circulation of ammonium analysis mother liquor is large

[0038] Therefore, above-mentioned technology all has limitation in the application in the actual production of soda ash

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