METHOD FOR THE MANUFACTURE OF ALKALI METAL CHROMATE FROM CHROME ORE

摘要

1359849 Alkali metal chromates NIPPON DENKO KK 23 Aug 1971 [31 Aug 1970] 39382/71 Heading C1A Alkali metal chromates are prepared by heating a mixture of powdered chrome ore, Ca(OH) 2 , leach residue together with powdered Na 2 CO 3 and/or NaOH in an inclined rotary kiln 1 supplied with a free O 2 -containing gas through nozzle 8, thereby fluidizing the roasting mixture, and then leaching the roasted material to recover the chromates. The O 2 -containing gas may be air, O 2 or O 2 -enriched air. The mixed material may be in the form of pellets.