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37 results on '"Ju, Shaohua"'

14. Flash evaporation intensified by microwave energy and performance analysis

Author

A. V. Ravindra, Liu Xiao ling, Ju Shaohua, Guo lei, Peng Jinhui, Zhang Lihua, and Tian Shihong

Subjects
Materials science, 020209 energy, Nuclear engineering, Single factor, Evaporation, Energy Engineering and Power Technology, Flash evaporation, 02 engineering and technology, Industrial and Manufacturing Engineering, Volumetric flow rate, 020401 chemical engineering, 0202 electrical engineering, electronic engineering, information engineering, 0204 chemical engineering, Scaling, Microwave, Efficient energy use, Dimensionless quantity
Abstract

A novel microwave flash evaporation (MFE) system is presented in this paper for the first time, which is expected to solve the inherent problems of conventional flash evaporation (CFE) system, such as high energy consumption, scaling, and long stages etc. In order to demonstrate the performance of such a novel system, some single factor experiments have been carried out by using water as experimental material, and the influence of parameters such as microwave power, initial temperature, and liquid flow rate have been studied. The results show that the evaporation quantity increases with the increase of microwave power, flow rate, and initial temperature. Under experimental conditions, the better operation condition is achieved at flow-rate of 40 L/h, initial liquid temperature of 50 °C, and microwave power of 1.35 kW, the evaporation quantity in the case of MFE is as high as 1.35 L in 20 min, but it is only 0.74 L in 20 min for CFE. The enhanced performance of MFE system is shown by comparing with the CFE system under the same conditions. Moreover, the energy efficiency is calculated and represented by a dimensionless parameter Gain Output Ratio (GOR), and the maximum energy efficiency for MSF system is about 79.38% at the better operation condition.

Published
2020

31. Leaching kinetics of zinc residues augmented with ultrasound

Author

Wang Xin, Yang Da-jin, Duan Xin-hui, Chandrasekar Srinivasakannan, Peng Jinhui, and Ju Shaohua

Subjects
inorganic chemicals, Order of reaction, Chemistry, Kinetics, Inorganic chemistry, technology, industry, and agriculture, chemistry.chemical_element, Filtration and Separation, Sulfuric acid, Activation energy, Zinc, Analytical Chemistry, Solvent, chemistry.chemical_compound, Particle size, Leaching (metallurgy)
Abstract

The leaching kinetics of zinc residue, having total Zn content of 12.31%, along with other metallic components such as Fe and Pb, is leached using sulfuric acid as solvent, augmented with ultrasound is presented. The effects of variables such as the leaching temperature, sulfuric acid concentration, particle size, liquid/solid ratio and the ultrasound power have been assessed. The results show the maximum recovery of zinc to be 80% at an ultrasound power of 160 W, leaching temperature of 65 °C, sulfuric acid concentration of 1.4 mol/L, particle size range of 74–89 μm and liquid/solid ratio of 4. The kinetics of leaching is modeled using shrinking core model and the rate controlling step is identified to be the diffusion through the product layer. The raw and the leached residue are characterized using XRD and SEM/EDX analysis. The activation energy is estimated to be 6.57 KJ/mol, while the order of reaction with respect to sulfuric acid concentration is 0.94 and particle size is 0.12 respectively.

Published
2013

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