Wenwen Qu
Kunming University of Science and Technology
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Publication
Featured researches published by Wenwen Qu.
High Temperature Materials and Processes | 2013
Chenhui Liu; Libo Zhang; Jinhui Peng; Wenwen Qu; Bingguo Liu; Hongying Xia; Junwen Zhou
Abstract The effects of moisture content and temperature on the dielectric property of sodium chloride were investigated by using open-ended senor dielectric measurement system at the frequency of 2.45 GHz. Moisture content is a major influencing factor in the variation of dielectric properties. Dielectric constant, loss factor and loss tangent all increase linearly with moisture content increasing. Three predictive models were developed to obtain dielectric constant, loss factor, loss tangent and of sodium chloride as linear functions of moisture content. Temperature between 20 °C and 100 °C has a positive effect on dielectric constant and loss factor. Penetration depth decreased nonlinearly with moisture and temperature increasing. A predictive model was developed to calculate penetration depth for sodium chloride as a fifth function of moisture content. In addition, the measurements indicate that the particles temperature increases linearly with microwaving heating time at different power levels. The knowledge gained from these results is useful in developing more effective applications of microwave drying and designing better sensors for measuring moisture content of sodium chloride.
Ultrasonics Sonochemistry | 2018
Lu Wang; Liu Chao; Wenwen Qu; Shengming Xu; Libo Zhang; Jinhui Peng; Xiaolei Ye
Currently, roasting-leaching is the main treatment process of spent hydrodesulfurization (HDS) catalyst, but it will produce impurities, such as nickel molybdate and cobalt molybdate (NiMoO4 or CoMoO4), which is adverse to recover valuable metals. In this paper, a combined ultrasonic-microwave method was developed to remove oil and recover molybdenum (Mo) from the spent HDS catalyst. Firstly, ethanol was used to extract the surface oil of the spent MoNiCo/Al2O3 catalyst with ultrasonic assistance. Effects of temperature, ultrasonic time, liquid-solid ratio and ultrasonic power on the oil removal rate were investigated systematically and the process conditions were optimized using response surface methodology (RSM). The results showed that the oil removal rate was over 99% under the optimum conditions of temperature 55 °C, ultrasonic time 2 h, liquid to solid ratio 5:1, and ultrasonic power 600 W. After oil removal, the sample was roasted in microwave field at 500 °C for 15 min. The generation of toxic gas could be effectively avoided and no hardest-to-recycle impurity CoMoO4 was found. At last, the roasted sample was subjected to ultrasonic leaching with sodium carbonate (Na2CO3) solution for recovering Mo. Extraction of Mo of the deoiled sample after microwave roasting reached 94.3%, which is about 7% higher than that of oily sample. Moreover, microwave roasting method resulted in a much higher Mo extraction than traditional method for both the oily and deoiled spent catalyst. It was concluded that the ultrasonic-microwave assisted method could remarkably improve the recovery of Mo and greatly shorten the processing time.
Desalination | 2009
Zhengyong Zhang; Wenwen Qu; Jinhui Peng; Libo Zhang; Xiangyuan Ma; Zebiao Zhang; Wei Li
Journal of The Taiwan Institute of Chemical Engineers | 2009
Zhengyong Zhang; Jinhui Peng; Wenwen Qu; Libo Zhang; Zebiao Zhang; Wei Li; Rundong Wan
Coloration Technology | 2012
Xinhui Duan; Chandrasekar Srinivasa Kannan; Wenwen Qu; Xin Wang; Jinhui Peng; Libo Zhang; Hongying Xia
Desalination and Water Treatment | 2016
Wenwen Qu; Qiong Hu; Yi Zhu; Jinhui Peng; Libo Zhang
Archive | 2008
Jinhui Peng; Zhengyong Zhang; Libo Zhang; Zebiao Zhang; Wenwen Qu; Liexing Zhou
Archive | 2012
Libo Zhang; Xin Wang; Xinhui Duan; Jinhui Peng; Wenwen Qu; Hongying Xia
Archive | 2008
Jinhui Peng; Rui Jie; Libo Zhang; Zhengyong Zhang; Liexing Zhou; Wenwen Qu; Wei Li; Ning Li; Bingguo Liu
Archive | 2008
Jinhui Peng; Tiancai Qian; Liexing Zhou; Libo Zhang; Shaohua Wang; Wenwen Qu; Zhengyong Zhang; Wei Li; Zebiao Zhang; Shenghui Guo; Shimin Zhang; Rui Xie; Bingguo Liu