Division of Extractive Metallurgy, Luleå University of Technology, Luleå, Sweden.
Waste Manag. 2010 Jan;30(1):140-4. doi: 10.1016/j.wasman.2009.09.025. Epub 2009 Oct 21.
Within the European Union, it is estimated that between 8 and 9 million tons of waste electric and electronic equipment (WEEE) arises annually, of which television sets and computers account for an important part. Traditionally, Cathode Ray Tubes (CRT) have been used for TVs and computer monitors, but are rapidly being replaced by flat-screen technology. Only part of the discarded CRT glass is being recycled. Primary smelters use large amounts of silica flux to form iron-silicate slag, and can, in most cases, tolerate lead input. Use of discarded CRT glass in copper smelting is a potential alternative for utilization of the glass. The mineralogical composition of a slag sampled during ordinary slag praxis has been compared with that of a mixture of slag and CRT glass when re-melted and slowly cooled. Slag (iron-silicate slag) from Boliden Mineral AB, Sweden, was used for the experiments. Slag and glass have been mixed in various proportions: pure slag, pure glass, 90% slag-10% glass and 65% slag-35% glass, and heated in an inert atmosphere up to 1400 degrees C in a Netzsch Thermal Analysis (TA) instrument. The re-melted material has been analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM) to determine changes in mineralogical composition after mixing with glass. The results show that the main mineralogical component of the slag is fayalite; the CRT glass is amorphous. The main crystalline phases of the slag do not change with addition of glass. An amorphous phase appears when the addition of glass is increased, which gives the sample a different structure.
在欧盟内部，据估计每年产生 800 万至 900 万吨废弃电子电气设备（WEEE），其中电视机和电脑占重要部分。传统上，阴极射线管（CRT）用于电视和电脑显示器，但正在迅速被平板技术取代。只有部分废弃的 CRT 玻璃被回收。主要的冶炼厂使用大量的硅石助熔剂来形成铁硅酸盐炉渣，在大多数情况下，可以容忍铅的输入。在铜冶炼中使用废弃的 CRT 玻璃是利用玻璃的一种潜在替代方法。在普通炉渣实践中采集的炉渣的矿物学组成与再熔化和缓慢冷却时的炉渣和 CRT 玻璃混合物的矿物学组成进行了比较。实验中使用了瑞典 Boliden Mineral AB 的炉渣。将炉渣和玻璃以不同的比例混合：纯炉渣、纯玻璃、90%炉渣-10%玻璃和 65%炉渣-35%玻璃，并在惰性气氛中加热至 1400°C 的 Netzsch 热分析（TA）仪器中。用 X 射线衍射（XRD）和扫描电子显微镜（SEM）对再熔化的材料进行分析，以确定与玻璃混合后的矿物学组成变化。结果表明，炉渣的主要矿物成分是铁橄榄石；CRT 玻璃是非晶态的。加入玻璃后，渣的主要晶相不会发生变化。随着玻璃添加量的增加，出现了非晶相，使样品具有不同的结构。
