Volumes of waste glass diodes are generated with the
increasing
amount of obsolete electrical and electronic devices. These diodes
containing 60 wt % PbO should be considered as hazardous waste for
disposal. However, relevant research about their disposal is deficient
so that glass diodes have not been effectively treated yet. Thus,
a combined technology, comprising crushing, screening, magnetic separation,
and vacuum-carbon-reduction, was proposed for the harmless treatment
and resource recovery of waste glass diodes in this study. The energy
analysis assisted the optimization of the crushing process. After
optimization, metal materials with d > 0.6 mm
were
separated from the glass powder with d < 0.2 mm
by screening and magnetic separation, which can reach a separation
rate of 96 wt %. As for the high Pb-bearing glass, a vacuum-carbon-reduction
process was applied for Pb removal. Under the optimal conditions of
ball-milling pretreatment, 9 wt % of graphite added, reaction temperature
of 1000 °C, and retention time of 3 h, the maximum Pb removal
rate could reach 98.87%. Amorphous glass powder transformed into crystalline
SiO2, and Pb reduced from PbO could be collected centrally.
This paper provides scientific information and green combination technology
for disposing of waste glass diodes.
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