METHOD FOR LOPARITE CONCENTRATE PROCESSING

WIPO Patent Application WO/2002/052050

A1

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 °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.

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ZOTS NIKOLAI VLADIMIROVICH (RU)
SHESTAKOV SERBEI VLADIMIROVICH (RU)

PCT/RU2000/000528

July 04, 2002

December 27, 2000

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ZOTS NIKOLAI VLADIMIROVICH (RU)
SHESTAKOV SERBEI VLADIMIROVICH (RU)

C22B34/24; C22B1/00; C22B3/06; C22B3/20; C22B59/00; C22B60/02; (IPC1-7): C22B34/24; C22B3/06; C22B3/20; C22B59/00; C22B60/02

SU50965A1	1936-11-30
SU117246A1	1958-11-30
US4309389A	1982-01-05

Andreev, Vladimir Ivanovich ("Nevinpat" St.Petersburg, 6, RU)

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