METHOD AND APPARATUS FOR RECOVERING ZINC AND IRON FROM ELECTRIC FURNACE DUST

Title:

METHOD AND APPARATUS FOR RECOVERING ZINC AND IRON FROM ELECTRIC FURNACE DUST

Document Type and Number:

WIPO Patent Application WO/2017/014204

Kind Code:

A1

Abstract:

With attention directed at the reduction treatment gas that contains metallic zinc vapor generated when reduced iron is manufactured from electric furnace dust that contains iron oxides and zinc oxide, the present invention addresses the problem of providing a method and apparatus for manufacturing reduced iron that allows zinc to be recovered efficiently with respect to process and energy efficiency perspectives as well. In view of the foregoing problem, the present invention is characterized in comprising: a carbon-containing molded article manufacturing step for admixing a binder with a charcoal material and electric furnace dust that contains zinc oxide and iron oxides, and molding the resulting mixture to manufacture a carbon-containing molded article; a preheating step for heating the carbon-containing molded article in an internally heated rotary kiln; a reduction treatment step in which the carbon-containing molded article heated in the preheating step is further heated in a hermetically sealed externally heated rotary kiln to manufacture reduced iron; and a zinc recovery step for recovering zinc from the reduction treatment gas generated in the reduction treatment step

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Inventors:

UEKAWA SEITA (JP)

Application Number:

PCT/JP2016/071075

Publication Date:

January 26, 2017

Filing Date:

July 15, 2016

Export Citation:

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Assignee:

TETSUGEN CORP (JP)

International Classes:

C22B19/30; C21B13/08; C22B1/245; C22B7/02

Foreign References:

JP5116883B1	2013-01-09
JPH05271799A	1993-10-19
JPH04110427A	1992-04-10
JPH04232216A	1992-08-20
US3463473A	1969-08-26

Attorney, Agent or Firm:

AOKI, Atsushi et al. (JP)

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