The problems of industrial waste processing, production of commercial products from them and their use as reagents for creating environmentally friendly efficient technological processes in various industries remain relevant. In this regard, the use of ammonium salts is of great interest. The author of the article develops the fundamental and applied foundations for expanding the scope of the ammonia-salt technology for solving a number of previously unsolved problems. It is proposed to use circulating ammonium bisulfate instead of sulfuric acid, which is a pyrolysis product of ammonium sulfate. The withdrawn ammonia can be widely used in various well-known production processes, such as the purification of gases from sulfur dioxide and carbon, in the production of fertilizers, etc.