Process and device for recovering raw materials from waste...

C - Chemistry – Metallurgy – 22 – B

Patent

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Details

C22B 7/00 (2006.01) B01D 53/64 (2006.01) B01D 53/75 (2006.01) C22B 34/32 (2006.01) F23G 5/027 (2006.01) F23G 5/14 (2006.01) F23G 7/00 (2006.01) F27D 17/00 (2006.01)

Patent

CA 2288195

A process is disclosed for recovering raw materials, in particular heavy metals such as chromium, by separation from waste and residues, wherein a liquid or viscous starting mixture and/or a starting mixture composed of crushed or ground components is first prepared. The invention is characterised in that the raw materials are separated by a thermochemical treatment. The liquid, viscous and/or solid starting mixture is first mixed with additives, depending on its composition, then subjected to a thermal treatment in an oven The atmosphere in the oven flows through the starting mixture and the suspended materials thus generated as flakes or dust are conveyed out of the oven through a filter installation with several stages in which they are separated from the waste gas. The first filter is designed as a hot filter, after which the waste gas is cooled and after flowing through at least a second filter, pre-heated and then burnt at a high temperature.

Ce procédé permet de récupérer par séparation des matières premières, notamment des métaux lourds tels que le chrome, dans des déchets et des résidus, à partir d'un mélange liquide ou pâteux initial et/ou d'un mélange initial constitué d'éléments broyés ou moulus. L'invention se caractérise en ce que les matières premières sont séparées par voie thermochimique. On mélange premièrement des additifs au mélange liquide, pâteux et/ou solide initial, en fonction de la composition de celui-ci, puis on le soumet à un traitement thermique dans un four. L'atmosphère à l'intérieur du four s'écoule à travers le mélange initial. Les matières en suspension qui en résultent sous forme d'écailles ou de poussière sont transportées hors du four jusqu'à une installation de filtrage à plusieurs étages dans laquelle elles sont séparées des gaz de fumée. Le premier filtre est un filtre chaud. Les gaz de fumée sont ensuite refroidis, s'écoulent au travers d'au moins un deuxième filtre, sont préchauffés puis brûlés à haute température.

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