Technology for producing sodium bicarbonate from mirabilite

Abstract

A technology for producing sodium bicarbonate from mirabilite comprises steps as follows: mirabilite and distillation waste liquor mixed liquor is used as a raw material, sodium carbonate is added to the solution after absorption of ammonia, magnesium, iron and calcium ions in the solution are removed after the solution is subjected to a precipitation reaction at 15-50 DEG C, and a refined solution is obtained; carbon dioxide is added to the refined solution for carbonatation, and sodium bicarbonate solids and heavy alkali mother liquor are obtained through separation after the refined solution is subjected to a replacement reaction at 15-50 DEG C; lime is added to the heavy alkali mother liquor, and ammonia gas, carbon dioxide, calcium sulfate and distillation waste liquor are obtained after distillation reaction at 15-120 DEG C; ammonia gas and carbon dioxide are recovered to ammonia absorption and carbonatation procedures respectively; the distillation waste liquor and mirabilite in Step A are mixed to be recycled. The technology has the characteristics that mirabilite is directly utilized, ammonia is recycled, the comprehensive utilization rate of distillation waste liquor waste is high, the production cost is low, the waste residue discharge is low, the technology is environment-friendly, and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, in particular to a process for producing sodium bicarbonate from mirabilite. Background technique [0002] Glauber's salt (contains Na 2 SO 4 ) refers to a carrier containing sodium sulfate (anhydrous sodium sulfate, sodium sulfate decahydrate, sodium sulfate solution). The known techniques for producing sodium bicarbonate with Glauber's salt as raw material mainly include the Lublin method and Glauber's salt wet method. Among them, there are problems such as large waste residue (1 ton of soda ash produces about 1.5 tons of CaS), high energy consumption, and poor product quality in the Lublin method; the carbonation mother liquor in the production of soda ash and ammonium sulfate by the thenardite wet method combined with soda method freezes out ten Glauber's salt and ammonium bicarbonate need to be evaporated to precipitate ammonium sulfate, which has the problems of high ...

AI Technical Summary

Problems solved by technology

Among them, there are problems such as large waste residue (1 ton of soda ash produces about 1.5 tons of CaS), high energy consumption, and poor product quality in the Lublin method; the carbonation mother liquor in the production of soda ash and ammonium sulfate by the thenardite wet method combined with soda method freezes out ten Glauber's salt and ammonium bicarbonate can only be evaporated to precipitate ammonium sulfate, which has the problems of high power consumption and high production cost

Therefore, the application of the above-mentioned processes in actual production has limitations.

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