Process for recycling solids, powders and sludges...

Details Process for recycling solids, powders and sludges... Process for recycling solids, powders and sludges...

H - Electricity

01

M

H01M 6/52 (2006.01) C22B 43/00 (2006.01) F23G 7/00 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2110400

ABSTRACT OF THE DISCLOSURE When a mixture of spent electric batteries is treated by pyrolysis, a pyrolysis slag is obtained having at least a residual mercury content between 50 and 1500 ppm, according to the battery type. It does not seem possible to eliminate this residual content by simply modifying the parameters of this pyrolysis process. The residual content may however be lowered below 10 ppm by a second thermal treatment between 500 °C and 700 °C. Preferably the material to be treated is crushed between the first pyrolysis and the second thermal treatment, and the second thermal treatment is carried out while air or nitrogen is blown through the material.

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