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2 030 357

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IPC

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Application

4918406/26, 1991-03-12

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Actual filing date

1991-03-12

(45)

Published

1995-03-10

(72)

Inventor

Zinjuk R.Ju.Shapkin M.A.Guller B.D.Lankin V.P.Marinin V.I.Khvishchuk V.A.Zubkov V.Ja.Gruzinskij N.B.Kutsenko V.S.Putintseva O.A.Aleksandrov V.V.

(73)

Holder

Sankt-Peterburgskij Tekhnologicheskij Institut

METHOD OF PRODUCING OF WET-PROCESS PHOSPHORIC ACID Russian patent published in 1995 - IPC

Abstract RU 2030357 C1

FIELD: inorganic chemistry. SUBSTANCE: method involves treatment of natural phosphate raw with sulfuric acid, reusable base and washing filtrates, filtration of reaction pulp and washing of calcium sulfate semihydrate precipitate with water containing sulfuric and hexafluosilicic acid at concentration 0.05-0.10 and 0.02-0.10 wt.-%, respectively. Part of washing filtrate (5-40 p. P₂O₅ per 100 p. P₂O₅ natural phosphate raw) is removed and combined with manufacture phosphoric acid. Method ensures to process phosphate raw with increased content of alkaline metal aluminosilicates. EFFECT: improved method of producing. 2 cl, 2 dwg

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RU 2 030 357 C1

Authors

Zinjuk R.Ju.

Shapkin M.A.

Guller B.D.

Lankin V.P.

Marinin V.I.

Khvishchuk V.A.

Zubkov V.Ja.

Gruzinskij N.B.

Kutsenko V.S.

Putintseva O.A.

Aleksandrov V.V.

Dates

1995-03-10—Published

1991-03-12—Filed