Patent ID: 8440152

Claim:
A process for recovering metals from a stream rich in hydrocarbons and carbonaceous residues, comprising: sending said stream to a primary treatment effected in one or more steps, wherein said stream is treated in the presence of a fluxant agent at a temperature ranging from 80 to 180° C. and subjected to liquid/solid separation to obtain a clarified product consisting essentially of a liquid portion and a cake; optionally subjecting the separated cake to drying to remove the hydrocarbon component having a boiling point lower than 350° C. from the cake; sending the cake to a secondary thermal treatment comprising: flamelessly pyrolyzing the cake at between 400 and 800° C. to form a pyrolysis residue, wherein an inert solid is added to the cake during the pyrolyzing; oxidizing the pyrolysis residue in an oxidizing environment and at temperatures ranging from 400 to 800° C.; wherein the secondary thermal treatment is effected in one or more multiple hearth furnaces having rabbling arms with teeth at least partially immersed in an inert bed.