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Title:
クロム酸化物含有スラグの処理方法
Document Type and Number:
Japanese Patent JP4540350
Kind Code:
B2
Abstract:

To provide a method of treating slag containing a chromium oxide for easily treating hexavalent chromium in the slag containing the chromium oxide while preventing the generation of drain containing hydrogen sulfide or sulfur.

The slag containing the chromium oxide is dipped in warm water, and hexavalent chromium in the slag containing the chromium oxide is eluted into the warm water and eliminated from the slag containing the chromium oxide. The temperature of the warm water is 30-100°C, and the slag containing the chromium oxide is dipped in a treatment vessel 15 at a ratio V/W of the volume V of warm water to the weight W of the slag containing the chromium oxide being 0.25 or more. A dipping time T is at least 30 minutes. Further, it is preferable that the layer of the slag containing the chromium oxide put in the treatment vessel 15 is rolled within the dipping time T at least the number of times N computed by N=INT[0.25T/(30V/W)]. INT shows arithmetic processing for obtaining an integer value by omitting fractions to a decimal point of 0.25T/(30V/W).

COPYRIGHT: (C)2005,JPO&NCIPI


Inventors:
Eiji Ikezaki
Toshitaka Yuki
Masato Yanagi
Application Number:
JP2004005730A
Publication Date:
September 08, 2010
Filing Date:
January 13, 2004
Export Citation:
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Assignee:
Nippon Steel Corporation
Taihei Kogyo Co., Ltd.
International Classes:
C02F1/70; B09B3/00; C21C5/28; F27D15/00; C21C5/54; C21C7/00
Domestic Patent References:
JP11100242A
JP11061118A
JP2000093923A
JP51113357A
JP2003334568A
JP3249984A
JP8229305A
JP10324547A
JP2002059141A
JP10219330A
Attorney, Agent or Firm:
Fujio Nakamae
Tadashi Harasaki