Federal State Unitary Enterprise «All-Russian Research Institute Of Chemical Technology» (FSUE «ARRICT»)

V. D. Kosynkin, Chief Researcher

A. K. Selivanovskiy, Head of Laboratory

T. T. Fedulova, Leading Researcher

K. M. Smirnov, Head of Department, e-mail: smirnov@vniiht.ru

O. K. Krylova, Head of Laboratory

The paper describes proposed phosphogypsum treatment schemes resulting in the recovery of REE concentrates, ammonium sulphate, ammonium nitrate limestone, high quality gypsum and precipitated calcium carbonate. The technology stipulates for generation of REE concentrate by direct treatment of phosphogypsum with nitric acid, as well as its recovery out of insoluble residue left after calcium nitrate solution purification, in which REE concentration takes place.

1. Fosfogips i ego ispolzovanie (Phosphogypsum and it`s using). Under the editorship of Evenchik S. D., Novikov A. A. Moscow : Khimiya, 1990. pp. 100–117.

2. Malikov V. A., Krylova O. K. Tsvetnye Metally – Non-ferrous metals. 2003. No. 4. pp. 63–64.

3. Krylova O. K., Smirnov K. M., Brizitskaya N. M., Dolgov V. V., Bukkolini N. M. Mir sery, N, P i K – World of sulfur, N, R and K. 2010. Is. 2. pp. 9–13.

4. Patent 2371389 RF. Sposob polucheniya gipsa (Way of gypsum obtaining). Andreev A. I., Degtyar T. S., Krylova O. K. Published 27.10.2009. Bull. No. 30.

5. Patent 2347750 RF. Sposob kompleksnoy pererabotki prirodnogo i/ili sinteticheskogo mela s polucheniem khimicheski chistogo mela i izvestkovo-ammiachnoy selitry (The way of the complex processing of nature and/or synthetic chalk with obtaining the chemically pure chalk and the ammonium nitrate lime). Andreev A. I., Degtyar T. S., Krylova O. K., Malikov V. A., Dukhovskoy A. N. Published 27.02.2009. Bull. No.6.

6. Mikhaylichenko A. I. et al. Redkozemelnye metally (Rare earth metals). Moscow, Metallurgiya, 1967.

7. Ryabchikov D. I., Ryabukhin V. A. Analiticheskaya khimiya elementov. Redkozemelnye elementy i ittriy (Analytical chemistry of elements. Rare earth elements and yttrium). Moscow : Nauka, 1966.