Device for the recovery of mercury

Details Device for the recovery of mercury Device for the recovery of mercury

1984-06-11

1986-01-14

Andrews, Melvyn J.

Metallurgical apparatus

With means treating or handling gases exhausted by treating...

By condensing and collecting a volatile constituent

75 81, 266 89, C22B 904

Patent

active

045641749

ABSTRACT:
This process enables the recovery of mercury from waste containing plastic material, e.g. batteries. The waste is slowly heated while an inert gas is being introduced in a vacuum for fractionating extraction of the products of the decomposition of the plastic. The waste gases must pass through an afterburner chamber incorporating a specially shaped burner where the plastic vapors are fully combusted. The waste gases are conducted from the afterburner chamber through a cooling trap and then through a cold trap in which the mercury is condensed and can be drained off. The final stage of the process is carried out in a pulsating vacuum by the inert gas.
The device in which the process takes place consists of a heated heat isolated treatment chamber (2), an afterburner chamber (6), a cooling trap (7), a cold trap (18) and a vacuum pump (23, 24) connected with pipelines (5, 12, 21). The system also includes a control unit (14) for regulating the operation of the vacuum pump (23, 24) and the settings of a shut-off valve (16) and a regulation valve (15) for the inert gas.
The plastic vapors are combusted in the afterburner chamber (6) by being heated in a flame basket produced with the aid of a concave flame cup (36) made of heat-resistant material.

REFERENCES:
patent: 1671964 (1928-06-01), Breitwieser
patent: 4254943 (1981-03-01), Bjorkman

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