Process for recovering rare metals from the combustion...

Details Process for recovering rare metals from the combustion... Process for recovering rare metals from the combustion...

C - Chemistry, Metallurgy

22

B

53/162

C22B 59/00 (2006.01) B03B 9/04 (2006.01) C22B 3/06 (2006.01) C22B 7/00 (2006.01) C22B 7/02 (2006.01) C22B 7/04 (2006.01)

Patent

CA 1184387

ABSTRACT The invention relates to a method for recovering rare metals from the combustion residues of various coals, in parti- cular brown coals. The recovery is performed by digestion, more particularly by aqueous and/or dilute alkaline and/or dilute acidic digestion, where two or three of these steps can be combined in any desired order or they may be carried out separately. During digestion the concentration of the solution is monitored and the subsequent digestion steps are terminated at a desired concentra- tion. The solid and liquid phase are then separated and the rare metals are isolated from the liquid phase while the solid phase, optionally after neutralization and/or washing can be utilized for example as a source of energy.

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