Method of processing used appliance batteries

Details Method of processing used appliance batteries Method of processing used appliance batteries

1991-12-23

1993-10-12

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204105R, 75403, 429 49, C25B 122, C25C 116, H01M 650

Patent

active

052521893

ABSTRACT:
Used appliance batteries are subjected to a thermal-mechanical treatment in a closed container at a temperature at which, with the assistance of mechanical pressure and/or impact, metal-plastics and metal-metal bonds are disrupted. Then, after the metal parts, the synthetic plastics parts and graphite electrodes are separated by conventional physical separating methods, vaporized mercury is extracted and washed with sulphuric acid in a washing device and any metal salts are brought into solution and processed by ion exchange. The treatment is carried out in an apparatus which includes a heatable container provided with a closable charging aperture, a discharge orifice and with feed and discharge lines for inert gas. A gas washing device for the inert gas leaving the container employs sulphuric acid with which the vaporized mercury reacts forming mercury sulphate.

REFERENCES:
patent: 3821026 (1974-06-01), Swartz
patent: 4769116 (1988-09-01), Olper et al.
patent: 4828661 (1989-05-01), Celi
patent: 5106466 (1992-04-01), Olper et al.

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