| 摘要 |
PROBLEM TO BE SOLVED: To prevent the elution of Cr6+ from a substance containing chromium oxide by a method in which the substance, after being immersed in water or blast furnace slag elution water, is contacted with a sulfur-containing substance whose oxidation number is a specified value or below and sprayed with steam. SOLUTION: A substance containing chromium oxide, after being immersed in blast furnace slag elution water generated in watering to water and/or blast furnace slag, is contacted with a sulfur-containing substance the oxidation number of which is +5 or below and sprayed with steam. In this process, sulfur- containing slag whose oxidation number is +5 or below is preferably used as the sulfur-containing substance. The slag is preferably is unaged blast furnace gradually cooled slag and/or molten iron preliminarily treated slag. Moreover, as a contact method and injection method, it is preferable to inject steam after the mixing of the substance containing chromium oxide after immersion in the blast furnace slag elution water and the sulfur-containing substance. |
