C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/08 (2006.01) C22B 7/04 (2006.01) C22B 15/00 (2006.01) C22B 19/30 (2006.01) C22B 23/00 (2006.01)
Patent
CA 2363969
This invention provides a process for economical extraction of residual base metal values in furnace slags, by utilizing smelter by-product sulphuric acid for the pressure leaching of such slags after sufficient initial slow- solidification to induce crystallization. After final solidification and cooling the slags are ground and pulped, mixed with sulphuric acid in an autoclave, and reacted at temperatures up to 275°C and pressures up to about 940psi when applying an oxygen over-pressure of up to 75psi, for up to 2 hours. High degrees of extraction of contained nickel, copper, cobalt and zinc if present, are achieved which are subsequently recovered from the leachate. Whereas the furnace slags, as produced and untreated, present a potential long term environmental hazard, after extraction of their base metal values they are rendered virtually benign vis--à-vis the environment. This method of pressure leaching can be applied to crystallized converter slags enriched in cobalt during the smelting of metal and copper sulphide ores.
Baghalha Morteza
Curlook Walter
Papangelakis Vladimiros
Baghalha Morteza
Curlook Walter
Hill & Schumacher
Papangelakis Vladimiros
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