Saltcake-ammonia circulation method for combined production of barium chloride, potassium sulfate, sodium carbonate

The invention refers to a co-production technique of three inorganic chemicals, that is co-production technique of barium chloride, potassium sulfate, sodium carbonate in sodium sulfate-ammonia circulating method in detail, including: (1)mixing the witherite and ammonium chloride and pumping into evaporation tower to get ammonia, CO2 gas, and barium chloride; (2)getting the ammonia, CO2 gas evaporated from the tower react with sodium sulfate to get ammonia sulfate and sodium acid carbonate that is burnt to sodium carbonate; (3) getting the ammonia sulfate react with potassium chloride for potassium sulfate, the byproduct of which is ammonium chloride that returns to (1) step to react with barium carbonate, and so on in cycles.