Iron oxide precipitation from acidic iron salt solutions

Details Iron oxide precipitation from acidic iron salt solutions Iron oxide precipitation from acidic iron salt solutions

C - Chemistry, Metallurgy

22

B

C22B 3/22 (2006.01) C01G 49/06 (2006.01) C22B 3/06 (2006.01) C22B 3/44 (2006.01) C22B 7/02 (2006.01)

Patent

CA 2536142

Improved methods for treating metallurgical compositions involve reacting a metallurgical composition with an aqueous nitric acid solution. The reaction is performed at a pressure or at least about 220 psig and at a temperature of at least 100·C. The metallurgical composition comprises iron and one or more non-ferrous metals. The reaction dissolves at least a portion of the non-ferrous metal compositions into the solution which is in contact with solid ferric oxide. The reaction can be repeated on the isolated solids to increase the purity of ferric oxide in the solids. Zinc can be removed from mixed metal solutions obtained from furnace dust by adding base to precipitate zinc hydroxide.

L'invention concerne des procédés améliorés permettant de traiter des compositions métallurgiques qui impliquent de faire réagir une composition métallurgique avec une solution aqueuse d'acide nitrique. La réaction est réalisée à une pression égale ou supérieure à environ 220 psig et à une température d'au moins 100 ·C. La composition métallurgique comprend du fer et un ou plusieurs métaux non ferreux. La réaction dissout au moins une partie des compositions de métaux non ferreux dans la solution qui est en contact avec de l'oxyde ferrique solide. On peut répéter la réaction sur des solides isolés afin d'augmenter la pureté de l'oxyde ferrique dans les solides. On peut éliminer le zinc des solutions métalliques mixtes obtenues de la poussière de four en ajoutant une base afin de faire précipiter l'hydroxyde de zinc.

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