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.

IPC Classes  ?

• C01G 37/033 - Chromium trioxideChromic acid
• C01G 49/00 - Compounds of iron
• C07C 55/07 - Salts thereof
• C07C 51/41 - Preparation of salts of carboxylic acids by conversion of the acids or their salts into salts with the same carboxylic acid part
• C22B 34/32 - Obtaining chromium