| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for treating substance containing chromium oxide, a method capable of preventing elution of Cr<SP>+6</SP>from the substance containing chromium oxide industrially, easily and also inexpensively. <P>SOLUTION: In treating the substance containing chromium oxide, an elution quantity is preliminarily measured of Cr<SP>+6</SP>from the substance containing chromium oxide. If the elution quantity of Cr<SP>+6</SP>is a prescribed value or above, the substance containing chromium oxide is made a mixture with a substance that contains sulfur and/or sulfur having oxidation number +5 or less, and a steam aging treatment for blowing in water vapor is performed thereon. Meantime, if the elution quantity of Cr<SP>+6</SP>is less than the prescribed value, the substance containing chromium oxide is subjected to an immersion aging treatment in which the substance containing chromium oxide is immersed in a liquid containing sulfur and/or sulfur having oxidation number +5 or less. As a substance containing sulfur and/or sulfur having oxidation number +5, unaged air-cooled blast furnace slag is desirable. In the immersion aging treatment, it is desirable that the water vapor drain of the steam aging treatment is used as the liquid for the immersion. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
