Barros A M, Tenório J A S, Espinosa D C R
Department of Metallurgical and Materials Engineering, University of São Paulo, Av. Prof. Mello Moraes 2463, São Paulo 05508-900, SP, Brazil.
J Hazard Mater. 2004 Aug 9;112(1-2):71-8. doi: 10.1016/j.jhazmat.2004.04.005.
Zinc, lead, and cadmium are minor elements that might be brought by wastes to the cement kilns. This work studies the incorporation ratio of ZnO, PbO, and CdO when they are added to the clinker raw material. The cement raw material used in this work was prepared by mixing pure compounds, this choice was made to avoid the effect of other elements and provide a better understanding of the behavior of these metals during the clinkering process. The samples contained additions of 0.05, 0.10, 0.30, 0.50, 0.80 and 1.00 wt.% of a specific oxide (ZnO, PbO, or CdO) to the clinker raw-meal. The chlorine influence in the ZnO incorporation ratio was also evaluated. A device to simulate the thermal cycle imposed on the charge during the clinker production was used to evaluate the incorporation ratio of these oxides as well as thermogravimetric tests. The products of the tests in the simulator device were submitted to X-ray fluorescence chemical analysis or energy disperse scanning (EDS) microprobe analysis. The results led to the conclusions that the evaporation of Zn in cements kilns is due to the chlorine content and the Pb and Cd incorporation ratio stands around 50 wt.%.
锌、铅和镉是可能随废物进入水泥窑的微量元素。本研究探讨了将氧化锌、氧化铅和氧化镉添加到熟料原料中的掺入率。本研究中使用的水泥原料由纯化合物混合而成，做出这种选择是为了避免其他元素的影响，并更好地了解这些金属在熟料煅烧过程中的行为。样品在熟料生料中添加了0.05、0.10、0.30、0.50、0.80和1.00 wt.%的特定氧化物（氧化锌、氧化铅或氧化镉）。还评估了氯对氧化锌掺入率的影响。使用一种模拟熟料生产过程中施加在物料上的热循环的装置来评估这些氧化物的掺入率以及热重测试。模拟器装置中的测试产物进行了X射线荧光化学分析或能量色散扫描（EDS）微探针分析。结果得出以下结论：水泥窑中锌的蒸发是由于氯含量，而铅和镉的掺入率约为50 wt.%。
