State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China.
Waste Manag. 2013 Feb;33(2):340-6. doi: 10.1016/j.wasman.2012.11.006. Epub 2012 Dec 11.
Heavy metals volatilization during thermal treatment of model solid waste was theoretically and experimentally investigated in a fluidized bed reactor. Lead, cadmium, zinc and copper, the most four conventional heavy metals were investigated. Particle temperature model and metal diffusion model were established to simulate the volatilization of CdCl(2) evaporation and investigate the possible influencing factors. The diffusion coefficient, porosity and particle size had significant effects on metal volatilization. The higher diffusion coefficient and porosity resulted in the higher metal evaporation. The influence of redox conditions, HCl, water and mineral matrice were also investigated experimentally. The metal volatilization can be promoted by the injection of HCl, while oxygen played a negative role. The diffusion process of heavy metals within particles also had a significant influence on kinetics of their vaporization. The interaction between heavy metals and mineral matter can decrease metal evaporation amount by forming stable metallic species.
在流化床反应器中，从理论和实验两方面研究了模型固体废物在热处理过程中的重金属挥发情况。研究了最常见的四种重金属：铅、镉、锌和铜。建立了颗粒温度模型和金属扩散模型，以模拟 CdCl(2) 蒸发的挥发情况，并考察了可能的影响因素。扩散系数、孔隙率和颗粒大小对金属挥发有显著影响。较高的扩散系数和孔隙率导致金属蒸发率较高。还通过实验考察了氧化还原条件、HCl、水和矿物质基质的影响。HCl 的注入可以促进金属挥发，而氧气则起负面作用。重金属在颗粒内的扩散过程对其蒸发动力学也有显著影响。重金属与矿物质之间的相互作用通过形成稳定的金属物种，会降低金属的蒸发量。
