METHOD OF SULPHURIC ACID PROCESSING OF RAW MATERIAL Russian patent published in 2015 - IPC C01B17/74 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry. Method includes sulphuric acid decomposition of raw material. Liquid phase is processed with reagent, precipitating useful component until sediment and ammonium sulphate solution are obtained. Sediment is separated and processed until substance, which forms reagent, containing ammonium ion and precipitating useful component, with ammonium, is released. Ammonium sulphate is processed to obtain ammonia. Substances, separated from sediments, and ammonia are returned to production. Ammonium sulphate is processed thermally, ammonia and ammonium hydrosulphate are obtained, produced is solution of ammonium hydrosulhate and auxiliary sulphate, which forms with ammonium sulphate double sulphate, which is precipitated until non-purified diluted solution of sulphuric acid is obtained, said double sulphate is separated, decomposed into ammonium sulphate, which is returned for decomposition into ammonium hydrosulphate and ammonia, and into auxiliary sulphate, which is returned for production of solution of ammonium hydrosulphate and auxiliary sulphate, which forms double sulphate with ammonium sulphate.

EFFECT: invention makes it possible to reduce formation of waste products, and reduce sulphuric acid consumption.

30 cl, 5 ex