Process for the separation of copper and heavy metals from...

C - Chemistry – Metallurgy – 22 – B

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C22B 7/04 (2006.01) C21B 3/04 (2006.01) C22B 1/08 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2216714

In a process for the separation of copper and heavy metals from incinerated garbage residue and slag, the residue and slag from garbage incineration or pyrolysis is heated to over 650 ~C under reducing conditions together with substances containing chlorine or chlorides, such as flue gas cleaning residues, CaCl2 from the soda production, cooking salt, organic solvents or electroplating sludge containing chlorine, whereupon Cu-chlorides and volatile heavy metal chlorides, such as PbCl2 or ZnCl2, are drawn off in the gas phase.

Selon un procédé permettant de séparer du cuivre et des métaux lourds contenus dans des résidus et des scories d'ordures incinérées, les résidus et les scories résultant de l'incinération ou de la pyrolyse d'ordures sont chauffés à plus de 650 ·C, dans des conditions de réaction, avec des substances contenant du chlore ou des chlorures, telles que des résidus de purification de gaz de fumée, du CaCl¿2? résultant de la production de soude, du sel de cuisine, des solvants organiques ou des boues contenant du chlore, puis les chlorures de CU et les chlorures de métaux lourds volatiles, tels que PbCl¿2? ou ZnCl¿2?, sont extraits en phase gazeuse.

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