Yunnan Provincial Key Laboratory of Intensification Metallurgy

Kunming, China

Yunnan Provincial Key Laboratory of Intensification Metallurgy

Kunming, China
SEARCH FILTERS
Time filter
Source Type

Liao X.,Kunming University of Science and Technology | Liao X.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Zhang L.,Kunming University of Science and Technology | Zhang L.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | And 10 more authors.
Powder Technology | Year: 2017

The preparation of coating material of welding electrode from marine placer via carbothermic reduction with added aluminum (Al) was systematically investigated. The reduction behavior and phase transformation of the marine placer–coal mixture with Al were checked by TG/DTG/DSG, XRD and SEM/EDS analysis. The additional Al can obviously increase the metallization rate of the mixtures, and the corresponding products easily exceeded the technical requirement. A reaction mechanism for the carbothermic reduction of the marine placer–coal mixture with Al was proposed. When the temperature was < 960 °C, the main reduction reaction was solid–solid reduction (C–iron bearing oxides) and a few aluminothermic reductions. These reactions have a slow reaction rate. When the temperature was higher than 960 °C, the gasification reaction just started, and the iron-bearing oxides were mostly reduced by CO. As the reduction progressed, the iron bearing oxides and the solid reductants, carbon and Al melt, increase in density because of the sintering mechanism and the compactness of the solid was improved. In addition, the gasification reaction rate increases with the enhancement of temperature, thereby accelerating the whole reduction. The heat released by the aluminothermic reduction increased the temperature in the neighboring area, thereby facilitating the gasification reaction and promoting the reduction rate to generate the metallic iron. © 2017


Liao X.,Kunming University of Science and Technology | Liao X.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Peng J.,Kunming University of Science and Technology | Peng J.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | And 6 more authors.
Journal of Alloys and Compounds | Year: 2017

Preparing coating material of welding electrode from ilmenite placer by carbothermic reduction with added ferrosilicon (Fe–Si) has been developed. The reduction behavior of ilmenite placer–coal–ferrosilicon mixture, as well as the phase composition and microstructure of reduced ilmenite were investigated by TG/DTG/DSG, XRD and SEM/EDS analysis, respectively. It is found that the carbothermic reduction of ilmenite placer can be enhanced by adding Fe-Si powder. A part of silicon in the Fe-Si acts as reductant to participate the reduction process. The heat released from the exothermal silicothermic reduction reactions increases the temperature in the neighboring area, facilitating the strong endothermic gasification reaction and finally accelerating the reduction rate. The results show that the addition of Fe-Si facilitates the nucleation and coalescence of metallic iron formed by reduction. © 2017 Elsevier B.V.


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.


Zhang L.-H.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Zhang L.-H.,Key Laboratory of Unconventional Metallurgy | Zhang L.-H.,National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology | Zhang L.-H.,Kunming University of Science and Technology | And 20 more authors.
RSC Advances | Year: 2014

The extraction and separation of cobalt from sulphate solution containing Ni2+ and Co2+ by the process of microfluidic extraction was investigated on a counter-current flow interdigital micromixer with channels of 40 μm width, which has two opposite inlets and an upwards outlet. Meanwhile, the comparative batch extraction experiments were conducted in separatory funnels. The effects of pH and flow rates or contact time on the microfluidic and batch experiments were studied using an aqueous solution containing 73.09 g L-1 of nickel and 2.44 g L-1 of cobalt and 20 vol% PC88A diluted with 260# solvent naphtha. In addition, cobalt extraction isotherms (Mc-Cabe Thiele) were constructed to determine the number of stages. The results of percentage extraction and separation factor of microfluidic extraction was better than that of batch extraction. The features of the microreactors, i.e. large specific surface area and short diffusion distance were effective for the efficient extraction and separation of cobalt from nickel. This journal is © the Partner Organisations 2014.


Yin S.,Kunming University of Science and Technology | Yin S.,Key Laboratory of Unconventional Metallurgy | Yin S.,National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology | Yin S.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | And 15 more authors.
Chemical Engineering and Processing: Process Intensification | Year: 2015

A new solvent extraction system of extracting La(III) with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (P507) has been investigated to intensify the extraction process in microreactor, and solve the problems like long mixing time, low processing capacity, large factory area occupation, and high energy consumption in the conventional rare earth solvent extraction equipment. In this work, extraction equilibrium studies show that the initial aqueous pH value 4.00 and saponification rate 40% are the optimal operation condition. The effects of volumetric flow rate on extraction efficiency are analyzed, and the results indicate that increasing flow ratio could improve the extraction efficiency greatly, up to almost 100%, and the two phases keep parallel flow while keeping an aqueous-organic interface in the microchannel. The mass transfer rate is proportional to the initial pH and P507 concentration, and approaches almost a constant value at high pH and extractant concentration, and the transfer process between the two phases accompanied with an interface chemical reaction is confirmed to proceed satisfactorily in a short time (residence time. =. 0.37. s). The features of the microreactors, i.e., large specific surface area and short diffusion distance are effective for the efficient extraction of La(III). © 2015 Elsevier B.V.


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.


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.


Liu C.-H.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Liu C.-H.,Kunming University of Science and Technology | Zhang L.-B.,Yunnan Provincial Key Laboratory of Intensification Metallurgy | Zhang L.-B.,Kunming University of Science and Technology | And 7 more authors.
Drying Technology | Year: 2014

The dielectric properties of petroleum coke at five temperatures between 20 to 100°C, covering different moisture content levels at 2.45 GHz, were measured using an open-ended coaxial probe dielectric measurement system. The effects of drying temperature, duration of drying, and sample mass on the moisture content and dehydration rate of petroleum coke was assessed utilizing the response surface methodology. The dielectric constant, loss factor, and loss tangent were all found to increase nearly linearly with increase in moisture content. Three predictive empirical models were developed to relate the dielectric constant, loss factor, and loss tangent of petroleum coke as a linear function of moisture content from 3-10%. An increase in temperature between 20 to 100°C was found to increase the dielectric properties. The penetration depth was observed to increase linearly with decrease in moisture content in the range of 3 to 10%. A predictive empirical model was developed to calculate penetration depth for petroleum coke. Two mathematical models were established and analyzed using RSM to describe the relationship between the microwave drying conditions and the responses, moisture content, and dehydration rate. Statistical analysis with response surface regression showed that microwave drying temperature, duration of drying, and sample mass were significantly related to moisture content and dehydration rate. Based on the RSM analysis, the optimum process conditions were estimated to be a microwave drying temperature of 75°C, drying duration of 10 sec, and sample mass of 60 g, with the resultant moisture content being 0.34 at a dehydration rate of 2.94 g/min. © 2014 Copyright Taylor and Francis Group, LLC.


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 4 more authors.
TMS Annual Meeting | Year: 2014

Preparation of activated carbon from the walnut shell by microwave assisted steam activation was studied. Influences of the three parameters, activation temperature, activation duration and steam flow rate on the adsorption capacity and yield of walnut shell activated carbon(WSAC) were investigated, optimization process was obtained by the Response Surface Methodology (RSM). The optimum preparation conditions were as follows: activation temperature of 980°C, activation duration of 41 min and steam flow rate of 1.66 ml/min. The optimum conditions resulted in an activation carbon with an iodine number of 1025 mg/g and a yield of 52.17%, while the BET surface area, total pore volume and average pore diameter of WSAC were 1328m2/g, 0.72ml/g and 2.2nm respectively. The study supported the potentiality of comprehensive utilization of Walnut shell and the benefits of the microwave heating.

Loading Yunnan Provincial Key Laboratory of Intensification Metallurgy collaborators
Loading Yunnan Provincial Key Laboratory of Intensification Metallurgy collaborators