微波能脱除铅锌冶炼中间物料中氟氯的研究进展

根据铅锌冶炼中间物料中的氟、氯主要是以强吸波物相氟氧化铅、氯氧化锌和氯化亚铜等形式存在,而物料其他成分如氧化锌、氧化铅等的吸波性相对较弱。提出了利用微波能选择性、高效脱除铅锌冶炼含氯中间物料中氟氯新工艺。对氧化锌烟尘、锌浮渣和含氯铜渣的研究结果表明：相比其他高温焙烧脱氟氯过程,脱氟氯温度可降低100℃以上,脱氟氯效率高;而且,可以采用气氛调控使脱氟、氯过程产生的尾气易于吸收净化,避免烟气污染。     

响应曲面法优化小桐子壳基活性炭制备条件的实验研究

采用水蒸气物理法制备小桐子壳基活性炭,通过响应曲面法中模型的优化设计和分析,研究了制备过程中的3个影响因子(活化温度、活化时间以及水蒸气流量)对活性炭碘吸附能力和得率的影响,并通过方差分析(ANOVA)研究了各个实验因子或交互作用对活性炭性能的影响。经过优化所获得的实验条件为:活化温度900℃,活化时间22min,水蒸气流量5.5g/min,获得的活性炭碘值为950mg/g,得率为13%,比表面积为785m2/g。     

Dechlorination of zinc dross by microwave roasting

Traditional treatments of zinc dross have many disadvantages,such as complicated recovering process and serious environmental pollution.In this work,a new process of chlorine removal from zinc dross by microwave was proposed for solving problem of recycling the zinc dross.With better ability of absorbing the microwave than zinc oxide,the main material in zinc dross,chlorides,can be heated and evaporated rapidly during microwave roasting.Various parameters including roasting temperature,duration time and stirring speed were optimized.The microstructure of roasted materials was characterized by X-ray diffraction（XRD） and scanning electron microscope（SEM）.The content of the chloride was analyzed by the method of chlorine ion selective electrode.The experiments indicate that the best duration time is 60 min with a stirring speed of 15 r/min during the microwave roasting process.The dechlorination rate reaches peak value of 88% at 700 ℃.The chlorine is removed as HCl gas when water vapor is used as activating agent,which means that it can be recovered into hydrochloride acid.