| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a disposal method which enables disposing of waste containing chromium without using a special disposal device and recovering the chromium as a steel material component. <P>SOLUTION: This method of disposing of waste containing chromium involves the following procedures: First, the waste 4 containing the chromium is put into a molten slag 3 of a ladle 1 in which a secondary refining is caaried out. After that, a reducing agent is added, and hence the chromium contained in the waste 4 is reduced and thus, the disposal of the waste 4 is accomplished. That is, the chromium can be recovered directly as a molten steel component by melting and reducing the waste 4 containing the chromium. Further, the concentration of chromic acid contained in the waste 4 is set at not more than 0.5% and therefore is below the hexavalent Cr elution criterion to soil, 0.05 mg/l, so that the same disposal procedures as applied to the ordinary slag can be applied to the slag under this disposal. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
