전기로 제강분진이 첨가된 규산염계 유리의 중금속 용출 특성

Abstract

The stabilizing behavior of heavy metals in the silicate glass containing Electric Arc Furnace dust (EAF dust) were studied by the Toxic Characterization Leaching Procedure (TCLP) test, and the change of crystalline phase and glass network structure were investigated as a function of EAF dust content added. The glass containing EAF dust of 30 wt% an oxygen/network former ratio(R) of 2~3 allowing a fairly stable network structure thus showed much lower heavy metal leaching concentration than that for containing EAF dust above 50 wt% at TCLP test. For the glass containing EAF dust 50~60 wt%, however, the R was over 3, which weakened the glass network structure and increased the heavy metals leachate. Adding the EAF dust to a glass decreased the degree of Si-O-Si symmetry and increased the number of non-bridging oxygen, which decreased the chemical durability of glasses. When the dust content in a glass was over 70 wt%, the Zn and Fe ions reacted to form the spinel crystal rather than to bind to network structure of glass and leaching concentration of those ions from the specimen decreased, so the spinel phase could be attributed to lowering a heavy metal leaching.