ZINC OXIDE-CONTAINING WASTE PROCESSING METHOD

Title:

ZINC OXIDE-CONTAINING WASTE PROCESSING METHOD

Document Type and Number:

WIPO Patent Application WO/1997/030182

Kind Code:

A1

Abstract:

This method comprises a mixing step (90) in which a mixed processing material is obtained by mixing waste (7) and a reducing agent (8) with each other, a chlorine recovering step (91) in which chlorine and water are then recovered by heating the mixed processing material, a lead recovering step (92) in which fluorine and lead are then recovered by heating the mixed processing material under vacuum, a zinc recovering step (93) in which metal zinc is then recovered by reducing and evaporating zinc by heating the mixed processing material at a temperature higher than that in the lead recovering step (92) with the vacuum condition maintained, and a residue recovering step (94) in which the residue of the mixed processing material is then recovered. The method of this constitution enables high-purity metal zinc to be recovered from zinc oxide-containing waste, and such waste to be processed on site.

Inventors:

HARA TOSHIKATU (JP)
SASAMOTO HIROHIKO (JP)
OKADA YUJI (JP)
SUZUKI KAZUHIRO (JP)

Application Number:

PCT/JP1997/000372

Publication Date:

August 21, 1997

Filing Date:

February 12, 1997

Export Citation:

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Assignee:

AICHI STEEL WORKS LTD (JP)
TOYOTA MOTOR CO LTD (JP)
TOYOKIN CO LTD (JP)
HARA TOSHIKATU (JP)
SASAMOTO HIROHIKO (JP)
OKADA YUJI (JP)
SUZUKI KAZUHIRO (JP)

International Classes:

B09B3/00; C22B7/00; C22B7/02; C22B13/02; C22B19/04; C22B19/30; (IPC1-7): C22B7/02; C22B13/02; C22B19/04

Foreign References:

JPH07505677A	1995-06-22
JPH05271799A	1993-10-19
JPH042734A	1992-01-07
JPH08134557A	1996-05-28
JPH0718346A	1995-01-20

Other References: