Title:
TREATMENT OF CHROMIUM OXIDE-CONTAINING MATERIAL
Document Type and Number:
Japanese Patent JP3299174
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an industrially simple method of treating a chromium oxide-contg. material, capable of completely preventing the elution of Cr6+ from such a chromium oxide-contg. material as slag generated in the refining of stainless steel, chromium slag generated in the production of a chromium compd., sewage sludge and molten slag of sewage sludge.
SOLUTION: An aq. soln. contg. ≥0.03 wt.% in total sulfur and/or the the sulfur having ≤+5 oxidation number is brought into contact with a chromium oxide-contg. material. Otherwise, the chromium oxide-contg. material is mixed with the slag contg. sulfur and/or the sulfur having ≤+5 oxidation number and then water and/or the blast-furnace slag elution water generated when the blast-furnace slag is sprinkled with water and cooled is sprinkled on the mixture or steam is blown into the mixture. The chromium oxide-contg. material is dipped in the elution water.
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Inventors:
Hisahiro Matsunaga
Hiroyuki Tofusa
Masato Kumagai
Yasuo Kishimoto
Toshikazu Sakuraya
Yukio Sato
Hiroyuki Tofusa
Masato Kumagai
Yasuo Kishimoto
Toshikazu Sakuraya
Yukio Sato
Application Number:
JP5866198A
Publication Date:
July 08, 2002
Filing Date:
March 10, 1998
Export Citation:
Assignee:
Kawasaki Steel Co., Ltd.
International Classes:
C02F11/00; C04B5/06; B09B3/00; (IPC1-7): B09B3/00; C02F11/00; C04B5/06
Domestic Patent References:
| JP6279817A | ||||
| JP5433294A | ||||
| JP53102273A | ||||
| JP54118304A | ||||
| JP5836690A |
Attorney, Agent or Firm:
Eiichi Kobayashi
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