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“The information age’s toxic garbage” A review of electronic waste (e-waste) ... - page 18 / 24

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METALS RECYCLING IN EEE WASTE-1 Permanent/Electric Magnetic Separation: Ferrous metals (Fe&steel), Eddy Current Separation: Non-magnetic metals (Al, Cu) (Conductivity/Density ratio)

SECONDARY LEAD (Pb) RECOVERY

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In the reverberatory/rotary furnace, Pb containg material is reduced to soft Pb bullion (99.9% Pb) by coke and foreign materials are oxidized as slag (60-70% Pb).

Iron and limestone (fluxing)

Final slag

1-3% Pb, CaO, SiO2, FeO

(Disposed of landfills)

(Pb Bullion) low Sb

(%60-70 Pb)

Dust in the flue gas are collected by baghouse

(15-25% Sb)

Britannia Refined Metals (BRM) (UK) Isasmelt Plant Schematic Diagram (30000 tpa)

Desulphurisation by  Na2CO3/NaOH to form Pb-oxide and Na2SO4

87%

13%

0.6%

12.4%

Pb Distribution

Kettles

1991

High Sb

Energy Saving: 15-40%

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