Estimating The Quantity Of Solid Waste Generation In Oyo, Nigeria  

Oleh:

Sheng, Peter P. ; Etsell, Thomas H.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Waste Management & Research vol. 25 no. 4 (Aug. 2007), page 380-383.
Topik: Aqua regia; computer circuit board; electronic scrap; gold; leaching; recycling; recovery; hydrometallurgy; wmr 225–4
Fulltext: 380.pdf (227.59KB)

Isi artikel

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.

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