A METHOD OF PREPARING CHROMIC OXIDE AND FERROUS OXALATE FROM CARBON FERROCHROME

Title:

A METHOD OF PREPARING CHROMIC OXIDE AND FERROUS OXALATE FROM CARBON FERROCHROME

Document Type and Number:

WIPO Patent Application WO/2008/092363

Kind Code:

A1

Abstract:

The present invention disclosed a method of preparing chromic oxide and ferrous oxalate from carbon ferrochrome. The carbon ferrochrome which is cheap and gained easily is used as starting material. The carbon ferrochrome is dissolved in sulfuric acid, then oxalic acid is added to the solution to separate chrome and iron, and then ferrous oxalate powder with total impurities content less than 1% and chromic oxide with iron content less than 0.5% are obtained. The technical conditions are controlled as following: sulfuric acid of 20%-60% is used to dissolve carbon ferrochrome, the dissolving temperature is 80-150 °C, the amount of oxalic acidadded is 105% - 120% of the theoretical amount to precipitate iron into ferrous oxalate, precipitation time of iron is 20 min - 1h, and precipitation pH of iron is 2.0 - 4.0.

Inventors:

HU GUOHUA (CN)

Application Number:

PCT/CN2008/000084

Publication Date:

August 07, 2008

Filing Date:

January 11, 2008

Export Citation:

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Assignee:

HUNAN JOYFLY TECHNOLOGY DEV CO (CN)
HU GUOHUA (CN)

International Classes:

C01G37/033; C01G49/00; C07C51/41; C07C55/07; C22B34/32

Foreign References:

CN101041466A	2007-09-26
JPS5238472A	1977-03-25
US4608084A	1986-08-26

Other References: