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Application

2001125402/12, 2001-09-18

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Start date

2001-09-18

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Actual filing date

2001-09-18

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Published

2002-12-20

(72)

Inventor

Bushuev N.N.Rakcheeva L.V.Koval' V.I.Klassen P.V.Kazak V.G.Kochetkov S.P.Lembrikov V.M.Parfenov E.P.Klados D.K.

(73)

Holder

Otkrytoe Aktsionernoe Obshchestvo Institut Po Udobrenijam I Insektofungitsidam Im. Prof. Ja.V.Samojlova"

EXTRACTION PHOSPHORIC ACID PURIFICATION PROCESS Russian patent published in 2002 - IPC

Abstract RU 2194667 C1

FIELD: inorganic compounds technology. SUBSTANCE: invention relates to removal of sulfates and suspended materials from concentrated solutions (57.5-64% P2O5) of extraction phosphoric acid obtained via acid decomposition of apatite concentrate. In particular, to extraction phosphoric acid containing 57.5-64% P2O5 and 0.3-3% SO4, strontium compound is added in amount required to achieve ratio Sr2+: SO2-4

= 0.82-1.05 in acid. Stirring is effected for 0.5-1 h followed by settling for 50-100 h and separation of concentrates product sediment. EFFECT: enabled purification of high-concentration phosphoric acid and essentially full removal of sulfate precipitates. 2 cl, 3 ex

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RU 2 194 667 C1

Authors

Bushuev N.N.

Rakcheeva L.V.

Koval' V.I.

Klassen P.V.

Kazak V.G.

Kochetkov S.P.

Lembrikov V.M.

Parfenov E.P.

Klados D.K.

Dates

2002-12-20—Published

2001-09-18—Filed

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