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 p...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.展开更多
Through sampling from different depth and different zones in the zinc bath, the size distribution of dross particles built during galvannealed （GA） production is analyzed and compared with that during galvanized （G...Through sampling from different depth and different zones in the zinc bath, the size distribution of dross particles built during galvannealed （GA） production is analyzed and compared with that during galvanized （GI） production. The relationship between the dross formation during transitions from GA to GI and the effective Al of the melt is discussed. Finally, the characteristics of dross particles in GA coating and its effects on GA punching and painting performances are studied.展开更多
基金Project(51104073) supported by the National Natural Science Foundation of China
文摘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.
文摘Through sampling from different depth and different zones in the zinc bath, the size distribution of dross particles built during galvannealed （GA） production is analyzed and compared with that during galvanized （GI） production. The relationship between the dross formation during transitions from GA to GI and the effective Al of the melt is discussed. Finally, the characteristics of dross particles in GA coating and its effects on GA punching and painting performances are studied.
