Process for co-production of sodium carbonate and calcium sulfate from ammonium bicarbonate and glauberite tailings

Abstract

The invention provides a process for co-production of sodium carbonate and calcium sulfate from ammonium bicarbonate and glauberite tailings. The process comprises the following steps: 1) taking ammonium bicarbonate and bittern in the step 7) as raw materials, carrying out double decomposition reaction, and separating to obtain solid sodium bicarbonate, a sodium bicarbonate mother liquor and a small amount of sodium sulfate; 2) calcining the solid sodium bicarbonate to obtain a sodium carbonate product and carbon dioxide; 3) preheating the heavy alkali mother liquor to remove ammonium bicarbonate and ammonium carbonate at high temperature to obtain ammonia, carbon dioxide and deamination mother liquor; 4) reacting the deamination mother liquor with lime and glauberite tailings to obtain ammonia, carbon dioxide and ammonium-removed brine; 5) reacting the ammonium-removed brine with lime and sodium carbonate to obtain ammonium-removed refined brine and calcium-magnesium mud; 6) reacting the ammonium-removed refined brine with the carbon dioxide in the step 2), the ammonia and carbon dioxide in the step 3) and the ammonia and carbon dioxide in the step 4) to obtain bittern; and 7) circulating the bittern to the metathesis reaction process in the step 1).

Description

Technical field[0001]The present invention belongs to the field of inorganic chemical technology, particularly a carbonium and calcium maidenidine nitrate tailings, pure base, calcium sulfate process.Background technique[0002]Knifting sodium sulfate production has a pure alkali process with Pinland method and mamidites, ammonium sulfate, among them, 1) Poklanca-based spermatochi: Poor in Liblanfa, high quality, high production cost, large labor consumption and production The process is carried out between the solid phase, is difficult to continue. 2) Mangzite and moisture-made sodiomethosis and ammonium sulfate (cold alkaline method): There is a raw material using sodium sulfate, high raw material cost, sodium carbonate and ammonium bicarbonate can consume high, and ammonium sulfate The heat can consume a high disadvantage.[0003]In addition, known calcium maidenidikin is a raw material to produce sodium sulfate process, 1 ton of sodium sulfate, sodium sulfate, and a large amount of ...

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Problems solved by technology

[0002] Known sodium sulfate production soda ash process has Lu Bulan process and Glauber's salt wet process soda ash and ammonium sulfate, wherein, 1) Lu Bulan process soda ash: Lu Bulan process exists product quality difference, production cost height, artificial consumption is big and production The process is carried out between solid phases, and it is difficult to operate continuously.

2) Soda ash and ammonium sulfate produced by Glauber's salt wet method (cold combined soda method): solid sodium sulfate is used as raw material, the raw material cost is high, the power consumption of frozen crystallized sodium sulfate decahydrate and ammonium bicarbonate is high, and the frozen mother liquor evaporates ammonium sulfate Disadvantages of higher heat consumption

[0003] In addition, the known technique of producing sodium sulfate from glauberite tailings as raw material produces 1 ton of glauberite tailings as a by-product per ton of sodium sulfate. A large amount of glauberite tailings are stored in the open air to bring salty salt dust and salty salty waste water from dissolution in the rainy season. environmental pollution

[0004] Therefore, above-mentioned sodium sulfate is as raw material production soda ash and glauberite tailings is raw material production sodium sulfate technology all has limitation in actual production application

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