Process for treating sludge containing a recoverable metal and apparatus for recovering a metal such as aluminum contained in a sludge

摘要

"PROCESS FOR TREATING SPRAY CONTAINING A RECOVERABLE METAL AND APPLIANCE FOR RECOVERING A METAL, LIKE ALUMINUM, CONTAINED IN A SLOT". A process and an apparatus for improved recovery of metal from a sludge are described, in which a sludge treatment furnace is provided with a refractory lining or wall with good capacity to store and conduct heat. This furnace is preheated to a desired temperature by oxygen injection to burn non-recoverable metal that remains in the residue after the recoverable metal is contained in the sludge. When the sludge is treated in this preheated oven, the heat emanating from the oven wall is sufficient to melt and separate the recoverable metal contained in the sludge, without adding an external heat source, such as fuel burners or gas, plasma torches or electric arcs.