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Zheng Z.-Q.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Xia H.-Y.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Srinivasakannan C.,The Petroleum Institute | Peng J.-H.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Zhang L.-B.,Yunnan Provincial Key Laboratory of Intensification Metallurgy
High Temperature Materials and Processes | Year: 2014

Eupatorium adenophorum was utilized as raw materials for the preparation of activated carbon via microwave assisted steam activation. Influences of the three vital process parameters - activation temperature, activation duration and steam flow rate - have been assessed on the adsorption capacity and yield of Eupatorium adenophorum activated carbon (EAAC). The process parameters were optimized utilizing the Design Expert software and were identified to be an activation duration of 45 min, an activation temperature of 950 °C and a steam flow rate of 0.7 ml/min, with the resultant iodine number and yield being 1,010 mg/g and 20.13% respectively. The validity of process model to optimize the process parameters was verified using the analysis of variance (ANOVA). The key parameters that characterize quality of the porous carbon such as the BET surface area, total pore volume and average pore diameter were estimated to be 1,142 m2/g, 0.84 ml/g and 3.3 nm respectively, for the sample corresponding to the optimized process conditions. Additionally the pore structure is characterized using Scanning Electron Microscope (SEM). The present work strongly supports utilization of Eupatorium adenophorum as a potential precursor through microwave heating. © 2014 by Walter de Gruyter Berlin/Boston 2014. Source


Xia H.,Kunming University of Science and Technology | Xia H.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Xia H.,National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology | Peng J.,Kunming University of Science and Technology | And 5 more authors.
Green Processing and Synthesis | Year: 2015

The present study attempts to utilize Eupatorium adenophorum to prepare high surface area activated carbon (HSAAC) with K2CO3 activation using microwave heating. The operational variables including microwave power, K2CO3/C mass ratio and heating time on the adsorption capability and yield were identified. Additionally, the surface characteristics of HSAAC were characterized by nitrogen adsorption isotherms, X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The optimum conditions resulted in HSAAC with an iodine number of 1696 mg/g and a yield of 32.88%. The Brunauer-Emmett-Teller (BET) surface area and total volume were 2768 m2/g and 1.149 ml/g, respectively. The findings strongly support the feasibility for preparation of HSAAC from E. adenophorum by microwave heating. © 2015 by De Gruyter. Source


Zuo Y.-G.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Zuo Y.-G.,Key Laboratory of Unconventional Metallurgy | Zuo Y.-G.,Kunming University of Science and Technology | Zhang L.-B.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | And 11 more authors.
Advanced Materials Research | Year: 2013

The technology that CuCl residue from Zn hydrometallurgy was dried by microwave heating was studied. The influence of the drying duration, drying temperature and material thickness on dehydration rate was investigated. The response surface methodology (RSM) technique was utilized to optimize the process conditions. The optimum conditions for drying CuCl residue have been identified to be an drying temperature of 80, drying duration of 11 min and material thickness of 16 mm. The optimum conditions resulted in an CuCl residue with moisture content of 4.97%, which could ensure remove chlorine of CuCl residue by microwave roasting. © (2013) Trans Tech Publications, Switzerland. Source


Liu C.-H.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Liu C.-H.,National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology | Liu C.-H.,Kunming University of Science and Technology | Zhang L.-B.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | And 13 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2013

The permittivity of low grade Panzhuhua ilmenite ore at 2.45 GHz in the temperatures from 20 °C up to 100 °C was measured using the technology of open-ended coaxial sensor combined with theoretical computation. The results show that both the real (ε′ and imaginary (ε″) part of complex permittivity (ε′jε″ of the ilmenite significantly increase with temperature. The loss tangent (tan δ) is a quadratic function of temperature, and the penetration depth of ilmenite decreases with temperature increase from 20 °C to 100 °C. The increase of the sample temperature under microwave radiation displays a nonlinear relationship between the temperature (T) and microwave heating time (t). The positive feedback interaction between complex permittivity and sample temperature amplifies the interaction between ilmenite and the microwave radiation. The optimum dimensions for uniform heat deposition vary from 10 cm to 5 cm (about two power penetration depths) in a sample being irradiated from both sides in a 2.45 GHz microwave field when temperature increases from room temperature to 100 °C. © 2013 The Nonferrous Metals Society of China. Source


Zheng Z.-Q.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Zheng Z.-Q.,Kunming University of Science and Technology | Xia H.-Y.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Xia H.-Y.,Kunming University of Science and Technology | And 5 more authors.
Chemical Engineering and Processing: Process Intensification | Year: 2014

Crofton weed was converted into a high-quality activated carbon (CWAC) via microwave-induced CO2 physical activation. The operational variables including activation temperature, activation duration and CO2 flow rate on the adsorption capability and activated carbon yield were identified. Additionally the surface characteristics of CWAC were characterized by nitrogen adsorption isotherms, FTIR and SEM. The operating variables were optimized utilizing the response surface methodology and were identified to be an activation temperature of 980°C, an activation duration of 90min and a CO2 flow rate of 300ml/min with a iodine adsorption capacity of 972mg/g and yield of 18.03%. The key parameters that characterize quality of the porous carbon such as the BET surface area, total pore volume and average pore diameter were estimated to be 1036m2/g, 0.71ml/g and 2.75nm, respectively. The findings strongly support the feasibility of microwave heating for preparation of high surface area porous carbon from Crofton weed via CO2 activation. © 2014 Elsevier B.V. Source

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