METHOD FOR LOPARITE CONCENTRATE PROCESSING

摘要

The inventive method consists in grinding and breaking down a loparite concentrate by nitric acid. A solution is separated by the filtration thereof on a ferrum-thorium cake and a pure nitrate solution of rare-earth elements which are precipitated by sodium carbonate in the form of a totality of rare-earth element carbonates. A filtrate is processed by evaporation until a concentration of 500-600 g/l is obtained and by subsequent hydrolysis at a temperature of 600-800 DEG C, thereby producing elementary nitrogen, oxygen and carbon dioxide in exit gases and powdered sodium oxide. The sodium carbonate produced by the interaction of said sodium oxide with carbon dioxide is provided in order to neutralise a nitrate solution and precipitate the rare-earth element carbonates. The exit gases are exposed to water washing and released into the atmosphere.