Karamanov Alexander, Aloisi Mirko, Pelino Mario
Institute of Physical Chemistry, Bulgarian Academy of Science, G. Bonchev Str. Block 11, 1113 Sofia, Bulgaria.
J Hazard Mater. 2007 Feb 9;140(1-2):333-9. doi: 10.1016/j.jhazmat.2006.09.040. Epub 2006 Sep 23.
The vitrification of an hazardous iron-rich waste (W), arising from slag flotation of copper production, was studied. Two glasses, containing 30wt% W were melted for 30min at 1400 degrees C. The first batch, labeled WSZ, was obtained by mixing W, blast furnace slag (S) and zeolite tuff (Z), whereas the second, labeled WG, was prepared by mixing W, glass cullet (G), sand and limestone. The glass frits showed high chemical durability, measured by the TCLP test. The crystallization of the glasses was evaluated by DTA. The crystal phases formed were identified by XRD resulting to be pyroxene and wollastonite solid solutions, magnetite and hematite. The morphology of the glass-ceramics was observed by optical and scanning electron microscopy. WSZ composition showed a high rate of bulk crystallization and resulted to be suitable for producing glass-ceramics by a short crystallization heat-treatment. WG composition showed a low crystallization rate and good sinterability; glass-ceramics were obtained by sinter-crystallization of the glass frit.
对铜生产炉渣浮选产生的富含铁的危险废物（W）进行了玻璃化研究。将含有30wt%W的两种玻璃在1400℃下熔化30分钟。第一批标记为WSZ，是通过将W、高炉矿渣（S）和沸石化凝灰岩（Z）混合得到的，而第二批标记为WG，是通过将W、碎玻璃（G）、沙子和石灰石混合制备的。通过TCLP试验测定，玻璃料显示出高化学耐久性。通过DTA评估玻璃的结晶情况。通过XRD鉴定形成的晶相为辉石和硅灰石固溶体、磁铁矿和赤铁矿。通过光学显微镜和扫描电子显微镜观察玻璃陶瓷的形态。WSZ组合物显示出高的整体结晶速率，并且适合通过短的结晶热处理来生产玻璃陶瓷。WG组合物显示出低的结晶速率和良好的烧结性；通过玻璃料的烧结结晶获得玻璃陶瓷。
