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2 051 112

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C1

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IPC

(21) (22)

Application

5054313/26, 1992-04-20

(22)

Actual filing date

1992-04-20

(45)

Published

1995-12-27

(72)

Inventor

Neprjakhin A.E.Sadykova N.P.Chajkin V.G.

(73)

Holder

Tsentral'Nyj Nauchno-Issledovatel'Skij Institut Geologii Nerudnykh Poleznykh Iskopaemykh

PROCESS FOR PURIFYING SEWAGE OF HEAVY METAL IONS AND SIX- VALENT CHROMIUM Russian patent published in 1995 - IPC

Abstract RU 2051112 C1

FIELD: processes for purifying sewage. SUBSTANCE: sewage containing chromium ions and other heavy metals is passed through a layer or zeolite pretreated with an oxalic acid solution with a concentration of 0.05 to 0.1 mole/l in the presence of mineral acid with a pH adjusted to 1-2. The process makes it possible to improve the degree of purification of sewage of six-valent chromium ions to 100% and to obtain a high degree of purification of sewage of other heavy metals. EFFECT: improved efficiency of purification of sewage of heavy metal ions due to additional recovery of six-valent chromium ions. 3 tbl

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RU 2 051 112 C1

Authors

Neprjakhin A.E.

Sadykova N.P.

Chajkin V.G.

Dates

1995-12-27—Published

1992-04-20—Filed

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