Method for the disposal of nickel-cadmium or nickel-hydride cells
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United States of America Patent
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Jan 3, 1995
Grant Date -
N/A
app pub date -
Aug 23, 1993
filing date -
Sep 2, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Waste material, consisting of collected nickel-cadmium or nickel-hydride cells, after a preliminary reduction in size, is subjected to a subsequent grinding reduction in size and is then screened. The screen coarse fraction (G) is separated into a light fraction (L) and a heavy fraction (H) by means of an air separation, and the later fraction (H) is magnetically separated. The light fraction (L) and the non-magnetic portion (HN) are dried and screened in order to free the non-metallic components (P,PPW) from the predominantly metallic fine portion (S) and so that they can be divided out as a harmless product. The magnetic portion (HM) is mechanically scoured (8) and possibly washed, whereby one obtains a smeltable Ni--Fe mixture. The screen fine fraction (F) and the fine portion (S) resulting from the processing of the coarse fraction (G) are dissolved in thinned acid (HCL). After filtering the acid at least metallic nickel and as the case may be cadmium or metal hydride are selectively extracted from the purified solution. The acid after being cleaned of waste electrolyte (KOH) can be recycled.
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