| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method with which chromium-containing waste is made to be harmless and slag having no elution of hexavalent chromium, is generated, and the gentleness to the environments is obtained and the recycle can easily be obtained at a low cost. <P>SOLUTION: In a converter refining process, with which after performing desiliconizing or desiliconizing and dephosphorizing refining by utilizing the converter, the blowing is once interposed, and an intermediate slag-off process for removing the slag, is arranged and after completing the slag-off, decarburizing refining is continuously performed and after completing tap-off of molten steel, under a state of leaving the decarburized slag at a high temperature in the furnace without removing this slag, this slag is reused to the desiliconizing or the desiliconizing and dephosphorizing refining in the following molten iron, the chromium-containing waste is added at the above decarburizing refining. The reduction of chromium and the dilution of chromium are performed with the decarburizing refining and further, the dilution of chromium is performed with the desiliconizing and the dephosphorizing refining, and thus, the lowering of the chromium concentration in the removed desiliconized and dephosphorized slag is realized. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
