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2 081 836

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IPC

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Application

94002954/25, 1994-01-26

(22)

Actual filing date

1994-01-26

(45)

Published

1997-06-20

(72)

Inventor

Chekhomova L.F.Soloshenko A.A.Popov B.A.Volkomorov A.I.Gorjajnov V.Eh.Isaev A.I.Gorjajnova L.V.Volkomorova N.A.Kineva E.A.Novozhilov L.N.Borovikova E.V.

(73)

Holder

Pervoural'Skoe Aktsionernoe Obshchestvo

METHOD FOR PRODUCTION OF OXIDE OF CHROMIUM (III) HAVING LOW CONTENT OF HEXAVALENT CHROMIUM Russian patent published in 1997 - IPC

Abstract RU 2081836 C1

FIELD: production of oxide of chromium (III). SUBSTANCE: method involves thermal decomposition of chromium anhydride, washing thus prepared Cr2O3, against water soluble materials, suspending in 8-10 % solution of urea, separation of liquid phase and thermal treatment. Said separation is carried out till moisture content of precipitate is 30-35 mass %, mentioned above heat treatment takes place at 200-280 C. EFFECT: improved efficiency of the method. 1 tbl, 1 dwg

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RU 2 081 836 C1

Authors

Chekhomova L.F.

Soloshenko A.A.

Popov B.A.

Volkomorov A.I.

Gorjajnov V.Eh.

Isaev A.I.

Gorjajnova L.V.

Volkomorova N.A.

Kineva E.A.

Novozhilov L.N.

Borovikova E.V.

Dates

1997-06-20—Published

1994-01-26—Filed

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