Patent ID: 6106765
Filing Date: 2000-08-22
Classification: B22F,C22B,C22C

Abstract:
A process for purifying a chromium metal obtained from an electrolytic, aluminothermic, or a pyrometallurgical reduction process comprising:treating said chromium metal with hydrogen gas in an amount greater than or equal to about 0.8 m.sup.3 per Kg of chromium metal, at a temperature of about 1200.degree. C. to about 1600.degree. C., for a period of about 2 hours to about 10 hours;treating said chromium metal in a vacuum at a pressure less than or equal to about 100 .mu.m of Hg (15 Pa), at a temperature of about 1200.degree. C. to about 1600.degree. C., for a period of about 2 hours to about 60 hours; andcooling and recovering a purified chromium metal.