Patent ID: 6521040
Filing Date: 2003-02-18
Classification: C22B,Y02P

Abstract:
A method for processing chromium oxide-containing substances, comprising the steps of:obtaining a source of blast furnace slag-released water having been used for cooling blast furnace slag, the water having therein at least one member selected from the group consisting of sulfur and compounds of sulfur having a valence less than 6; applying steam to chromium oxide-containing substances; and after the steam-applying step, immersing the chromium oxide-containing substances in the obtained blast furnace slag-released water, wherein the immersion of the chromium oxide-containing substances in the obtained blast furnace slag-released water reduces chromium oxides in the chromium oxide-containing substances while avoiding increasing the volume of the chromium oxide-containing substances resulting in that the release of Cr(6+) from the chromium oxide-containing substances is prevented.