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Waste Management & Research
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*Compound via MeSH
*Substance via MeSH
Hazardous Substances DB
*FERROUS SULFATE
*GOLD
*HYDROCHLORIC ACID
*NITRIC ACID
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What's this?

Recovery of gold from computer circuit board scrap using aqua regia

Peter P. Sheng

Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada

Thomas H. Etsell

Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada, tom.etsell{at}ualberta.ca

Computer circuit board scrap was first treated with one part concentrated nitric acid and two parts water at 70°C for 1 h. This step dissolved the base metals, thereby liberating the chips from the boards. After solid—liquid separation, the chips, intermixed with some metallic flakes and tin oxide precipitate, were mechanically crushed to liberate the base and precious metals contained within the protective plastic or ceramic chip cases. The base metals in this crushed product were dissolved by leaching again with the same type of nitric acid—water solution. The remaining solid constituents, crushed chips and resin, plus solid particles of gold, were leached with aqua regia at various times and temperatures. Gold was precipitated from the leachate with ferrous sulphate.

Key Words: Aqua regia • computer circuit board • electronic scrap • gold • leaching • recycling • recovery • hydrometallurgy • wmr 225—4

Waste Management & Research, Vol. 25, No. 4, 380-383 (2007)
DOI: 10.1177/0734242X07076946
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