C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/20
C22B 7/04 (2006.01)
Patent
CA 1216432
ABSTRACT The present invention relates to a method for treating iron-bearing slags containing precious metals, parti- cularly slags created in copper and nickel smelting processes, by reducing the slag so that by means of adding a possible sulphidizing agent, the composition of the molten slag is regulated in solidified state to fall within the area wherein the metallicized, iron- bearing molten copper sulphide is in balance with the metallic copper and the iron-base metal alloy. By means of controlled cooling, the precious metals contained in this molten sulphide having an advantageous liquidus temperature are concentrated into the iron-base metal phase, whereafter the phase containing the precious metals can be separated by means of magnetic separation. After the magnetic separation, a selective hydrometal- lurgic treatment is carried out in order to recover the precious metals.
423516
Makinen Juho K.
Murden Keith B.
Saari Heikki P.
Marcoux & Sher Swabey Mitchell Houle
Outokumpu Oy
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