Process for the production of sodium dichromate

Details Process for the production of sodium dichromate Process for the production of sodium dichromate

C - Chemistry, Metallurgy

01

G

C01G 37/14 (2006.01) C22B 1/02 (2006.01) C22B 34/32 (2006.01)

Patent

CA 2041005

ABSTRACT OF THE DISCLOSURE The invention relates to a process for the production of sodium dichromate and sodium dichromate solu- tions by oxidative roasting of chrome ores under alkaline conditions, leaching of the furnace clinker obtained with water or an aqueous chromate-containing solution, adjust- ment of the pH to from 7 to 9.5, removal of the insoluble constituents by filtration, a sodium monochromate solution being obtained, conversion of the monochromate ions of this solution into dichromate ions by acidification and crystal- lization of sodium dichromate by concentration of this solution, characterized in that the acidification is carried out with carbon dioxide under pressure with removal of sodium hydrogen carbonate, the remaining solution is then very largely freed from sodium monochromate by cooling to a temperature below 10°C and filtration, any monochro- mate ions still present in the remaining solution are con- verted into dichromate ions by addition of an acid and the sodium monochromate filtered off is added to the sodium monochromate solution before conversion with carbon dioxide into a sodium dichromate solution. Le A 27 685

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