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“The information age’s toxic garbage” A review of electronic waste (e-waste) ... - page 20 / 24

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METALS RECYCLING IN EEE WASTE-3

        PRECIOUS METALS RECOVERY

Au, Ag, Pa and Pt are recovered from anode slime of  Cu electrolysis process by pressure leaching.

The leach residue is then dried and smelted with fluxes in the furnace.

During smelting Se is recovered; from remaining material, Ag is cast into Ag anode.

After high-intensity electrolitic refining, a high-purity Ag cathode and Au anode slime are formed.

Anode Au slime is then leached and high purity Au, as well as Pa and Pt sludge are precipitated.

One third of the precious metals recovered from e-waste are Au, as electronic scrap contains more than 40 times the Au contained in Au ores in the U.S.

PRECIOUS METALS REFINARY PROCESS

Recovering precious   metals from e-waste is one of the greatest economic profits for recycling industry in the world.

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