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Title:
METHOD AND APPARATUS FOR TREATING HIGH-TEMPERATURE SLAG
Document Type and Number:
WIPO Patent Application WO/2009/069794
Kind Code:
A1
Abstract:
A method in which slag is cooled in a treatment step without generating strongly alkaline water and without necessitating a prolonged time for the treatment. Using this method, slag is efficiently recovered as a valuable material and the metal contained in the slag is efficiently recovered. Also provided is an apparatus for the method. High-temperature slag containing CaO is subjected to primary cooling and thereafter subjected to secondary cooling while being moved inside a cooler. Both the primary cooling and the secondary cooling are water cooling conducted to such a degree that no free water is generated. A rotary cooler comprising a housing equipped with projections on the inner surface thereof can be used as the cooler. Slag having a temperature as high as 500°C or above is charged into the rotary cooler and cooled. The slag is separated into slag and a metal by means of the crushing that occurs due to impact when the slag falls due to the rotation of the housing and by the destruction caused by the rapid cooling of the slag.

Inventors:
TASAKI TOMOAKI (JP)
MUKAWA SUSUMU (JP)
AMADA KATSUMI (JP)
SAKUMA SEIYA (JP)
IDE MASAAKI (JP)
URAKAWA NORIAKI (JP)
Application Number:
JP2008/071756
Publication Date:
June 04, 2009
Filing Date:
November 25, 2008
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
TASAKI TOMOAKI (JP)
MUKAWA SUSUMU (JP)
AMADA KATSUMI (JP)
SAKUMA SEIYA (JP)
IDE MASAAKI (JP)
URAKAWA NORIAKI (JP)
International Classes:
C21C5/28; C04B5/00; C21C1/02; C21C7/00; F27D15/00; F27D15/02
Foreign References:
JP2001348252A2001-12-18
JP2001072449A2001-03-21
JPH10139502A1998-05-26
JP2003247786A2003-09-05
JPH11106274A1999-04-20
Attorney, Agent or Firm:
AOKI, Atsushi et al. (Toranomon 37 Mori Bldg. 5-1,Toranomon 3-chome, Minato-k, Tokyo 23, JP)
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