Technology for producing calcium carbonate from calcinator gas and calcium sulfate

The invention discloses a technology for producing calcium carbonate from calcinator gas and calcium sulfate. The technology comprises the following steps: enabling the calcinator gas and brine to react for 2-8 hours at 25-60 DEG C, wherein sodium hydroxide in the brine reacts with the calcinator gas to obtain reaction liquid, the reaction liquid contains sodium sulfate, sodium chloride, sodium nitrate, sodium carbonate and calcium sulfate, and the sodium carbonate and calcium sulfate in the reaction liquid react for 2-8 hours at 25-60 DEG C to generate a suspension containing calcium carbonate precipitate; performing solid-liquid separation of the suspension to obtain calcium carbonate precipitate and mother liquid respectively; washing the calcium carbonate precipitate with fresh water at 20-90 DEG C; performing solid-liquid separation to obtain washed calcium carbonate and washing liquid; and drying the washed calcium carbonate at 120-160 DEG C to obtain a product of calcium carbonate, and mixing the washing liquid with the production wastewater to dissolve raw ore containing sodium sulfate, sodium chloride, sodium nitrate, sodium hydroxide and calcium sulfate. The technology disclosed by the invention has the advantages of reasonable technology, low production cost, high added value, cyclic economy of waste utilization and environmental friendliness.