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Recovery of metals from waste printed circuit boards by a mechanical method using a water medium

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Abstract.
Research on the recycling of waste printed circuit boards (PCB) is at the forefront of environmental pollution prevention and resource recycling. To effectively crush waste PCB and to solve the problem of
secondary pollution from fugitive odors and dust created during the crushing process, a wet impacting
crusher was employed to achieve comminution liberation of the PCB in a water medium. The function
of water in the crushing process was analyzed. When using slippery hammerheads, a rotation speed of
1470 rpm, awater flowof 6m3/h and a sieve plate aperture of 2.2mm, 95.87% of the crushed productwas
sized less than 1mm. 94.30% of the metal was in this grade of product. Using smashed material graded
−1mm for further research, a Falcon concentrator was used to recover the metal from the waste PCB.
Engineering considerations were the liberation degree, the distribution ratio of the metal and a way to
simplify the technology. The separation mechanism for fine particles of different densities in a Falcon
concentrator was analyzed in detail and the separation process in the segregation and separation zones
was deduced. Also, the magnitude of centrifugal acceleration, the back flow water pressure and the feed
slurry concentration, any of which might affect separation results, were studied. A recovery model was
established using Design-Expert software. Separatingwaste PCB, crushed to −1mm, with the Falcon separator
gave a concentrated product graded 92.36% metal with a recovery of 97.05%. To do this the reverse
water pressure was 0.05MPa, the speed transducer frequency was set at 30 Hz and the feed density was
20 g/l. A flowdiagramillustrating the newtechnique ofwet impact crushing followed by separation with a
Falcon concentrator is provided. The technique will prevent environmental pollution fromwaste PCB and
allow the effective recovery of resources.Water was used as the medium throughout the whole process.

Keywords:
Waste printed circuit boards
Environment pollution
Metals recovery
Wet impact crushing
Falcon concentrator

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Hazardous Materials

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Journal of Hazardous Materials 166 (2009) 478–482

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

LINGKUNGAN HIDUP

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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