Preparation of ferrite from used dry cells
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United States of America Patent
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Jan 13, 1998
Grant Date -
N/A
app pub date -
Sep 11, 1996
filing date -
Sep 12, 1995
priority date (Note) -
Expired
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Abstract
Used dry cells are sorted into ultra-high power manganese dry cells and high power manganese dry cells including alkaline manganese cells. Line (I) of FIG. 1 includes crushing the ultra-high power manganese dry cells into fragments, sieving the fragments to collect a first fraction of depolarizer mass and a second fraction of metal casings, calcining the first fraction to form manganese and zinc oxides, and processing the oxides into a ferrite having a higher MnO/ZnO ratio. Line (II) of FIG. 1 includes crushing the high power manganese dry cells including alkaline manganese cells into fragments, sieving the fragments to collect a third fraction of depolarizer mass, adding zinc cans from the second fraction to the third fraction, calcining the mixture to form manganese and zinc oxides, and processing the oxides into another ferrite having a lower MnO/ZnO ratio.
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