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- 저자 : Zhiwen Shao (검색결과 2 건)
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Zhiwen Shao,Qichi Le,Zhiqiang Zhang,Jianzhong Cui 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
Ultrasound with different powers was applied to treat AZ80 alloy melt to attain grain refinement or purifi-cation processing of the alloy. The influence of ultrasonic powers from 0 W to 1400 W on microstruc-tures of the AZ80 alloy with ultrasonic grain refinement treatment was investigated. The average grain size of the alloy could be decreased from 387 µm to 147 µm after the ultrasound with the optimal power 600 W was applied to treat the melt. The effect of ultrasonic powers from 0 W to 230 W on the inclusion distribution in the ingot that was treated by ultrasonic purification processing was also studied. The opti-mal ultrasonic power in the ultrasonic purification processing was 80 W. In order to gain insight into the mechanism by which ultrasonic power affected the microstructure of the alloy or inclusion distribution in the ingot, numerical simulations were carried out and the ultrasonic field propagation in the melt was characterized.
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Heavy metal stabilization in MSWI fly ash using an additive-assisted microwave hydrothermal method
Zhiwen Xu,Zhiyuan Liang,Huaishuang Shao,Qinxin Zhao 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
The dioxins and leachable heavy metals in municipal solid waste incineration (MSWI) fly ash made it ahazardous waste. Microwave hydrothermal with four common additives, Na2S, Na2SiO3, Na2B4O7 orH3BO3, was researched at different temperatures, L/S ratios, time and additive concentrations by singlefactor and orthogonal methods to achieve effective heavy metal stabilization and waste reuse of MSWIfly ash. The samples were investigated by XRD, BET, SEM, ICP-MS to determine the influence ofadditive-assisted microwave hydrothermal on heavy metals stabilizing. According to the results of theorthogonal study, the degree of influence of each parameter heavy metals stabilization was in the orderof additive, temperature, additive concentration, time and L/S ratio. Single-factor experiments suggestedthat the conditions of 125 C, 10 min, 3 mol/L Na2S and 2 mL/g were enough for the leaching concentrationof heavy metals meeting the specified limitation of China. The results of analyses confirmed thatmicrowave hydrothermal treatment with Na2S could enhance heavy metals stabilizing by forming zeolitesfor adsorption, precipitation and convert heavy metals to a more stable state. Microwave hydrothermalwith Na2S was a promising method to manage MSWI fly ash, which greatly decrease the reactiontime and realize wastes utilization.
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