# US 5,707,541 A · Preparation of ferrite from used dry cells

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- Number: US 5,707,541 A
- Document ID: US5707541A
- Status: Granted
- Kind: A
- Application number: 08/712,286
- Filed: 1996-09-11
- Granted: 1998-01-13
- Earliest claimed: 1995-09-12
- Assignees: Nomura Kohsan Co., Ltd.; TDK Corporation
- Inventors: Takashi Kanemaru; Takaaki Iwasaki; Shigeaki Suda; Takeo Kitagawa
- Web page: https://patentgrep.com/patent/US5707541A

## CPC

- H01M 6/52: Reclaiming serviceable parts of waste cells or batteries {, e.g. recycling}
- C04B 35/2658: {Other ferrites containing manganese or zinc, e.g. Mn-Zn ferrites}
- Y02W 30/84: Recycling of batteries or fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## 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.

## Claims

### Claim 1

A process for preparing ferrite from used dry cells, comprising the steps of:
sorting used dry cells into ultra-high power manganese dry cells and a mixture of high power manganese dry cells and alkaline manganese cells,
crushing the ultra-high power manganese dry cells into fragments to collect a first fraction containing metal casings,
separating a zinc value from the first fraction,
crushing the mixture of high power manganese and alkaline manganese dry cells into fragments, sieving the fragments to collect a second fraction composed mainly of positive and negative pole substances, adding the zinc value from the ultra-high power manganese dry cells the second fraction, calcining the mixture to form manganese oxides and zinc oxides, and reacting the manganese oxides and zinc oxides with an iron component tho form the ferrite.