High-purity barium metaphosphate and preparation method thereof

The invention belongs to the technical field of inorganic phosphorus chemical industry, and particularly relates to high-purity barium metaphosphate and a preparation method thereof. The preparation method of the high-purity barium metaphosphate comprises the following steps: (1) adding a phosphoric acid solution as a base solution into a reactor, and conducting heating; (2) taking another phosphoric acid solution, slowly adding the phosphoric acid solution and barium carbonate into the reactor in proportion, conducting heating, conducting stirring, and carrying out solid-liquid separation after the reaction is finished to obtain a solid and filtrate; (3) adding the filtrate into the reactor to be recycled as a base solution, drying the solid, conducting firing to constant weight, and conducting washing with water; and (4) conducting drying again to obtain the high-purity barium metaphosphate. The preparation method of the high-purity barium metaphosphate is simple in technological process, low in equipment i