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Zhang R.,Shaanxi Normal University | Zhang R.,Kunming Metallurgy College | Wang B.,Shaanxi Normal University | Ma H.,Shaanxi Normal University
Desalination | Year: 2010

Sulfonated lignite was prepared in order to study the adsorption behavior and the removal of Cr (VI) ions from aqueous solutions as a function of contact time, initial pH, using batch technique. Adsorption data of Cr (VI) on the sulfonated lignite were analyzed according to Langmuir-Freundlich and Temkin adsorption models. Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K and 313 K. (ΔH° = 14.16 kJ mol- 1; ΔGO =-4.43 to-5.71 kJ mol- 1 and ΔS = 63.42 J K- 1 mol- 1). The numerical values obtained showed that Cr (VI) adsorption is a spontaneous, entropy-driven and endothermic process. The process kinetics was evaluated by pseudo-first, pseudo-second order and Elovich kinetic models. Elovich kinetic model exhibited the highest correlation with data. These results show that the sulfonated lignite could be considered as a potential adsorbent for chromium ions in aqueous solutions. © 2009 Elsevier B.V. All rights reserved.


Zhang R.,Shaanxi Normal University | Zhang R.,Kunming Metallurgy College | Ma H.,Shaanxi Normal University | Wang B.,Shaanxi Normal University
Industrial and Engineering Chemistry Research | Year: 2010

A type of polyaniline was synthesized and its Cr (VI) removal potential was investigated in this work. The kinetics study, adsorption isotherm, pH effect, and thermodynamic study were examined in batch experiments. Adsorption data for Cr (VI) uptake by polyaniline were analyzed according to Langmuir and Freundlich adsorption models. Thermodynamic parameters for the adsorption system were determinated at 293 K, 303 K, and 313 K (ΔH° = 23.87 kJ mol -1; ΔG° = -10.76 to -13.13 kJ mol-1 and ΔS° = 118.20 J K-1 mol-1). The positive values of both ΔH° and ΔS° suggest an endothermic reaction, increasing in randomness at the solid-liquid interface during the adsorption process. ΔG° values obtained were negative, indicated that the adsorption of the Cr (VI) ion on the surface of polyaniline was a spontaneous adsorption process. The kinetics process can be described by a pseudosecond-order rate equation very well. The Cr (VI) adsorption capacity tended to increase with a decrease of pH. The maximum uptake of Cr (VI) was 95.79 mg g-1. These results show that the polyaniline doped with sulfuric acid could be considered as a potential adsorbent for chromium hexavalent ions in aqueous solutions. © 2010 American Chemical Society.


Wang P.,Xidian University | Zhang R.,Kunming Metallurgy College | Hua C.,CAS Institute of Process Engineering
Desalination and Water Treatment | Year: 2013

Activated carbon from crofton weed (ACCW) was evaluated for its ability to remove Cr(VI) from aqueous solutions. Batch experiments were used to examine kinetics, adsorption isotherm, pH effect, and thermodynamic parameters. Adsorption data for Cr(VI) uptake by ACCW were analyzed according to Langmuir and Freundlich adsorption models. Thermodynamic parameters for the adsorption system were determinated at 293, 303, and 313K (ΔH° = 15.02 kJ mol-1; ΔG° =-0.76 to -2.91 kJ mol-1, and ΔS° = 53.85 JK-1 mol-1). The ΔG° values obtained were negative, indicating that the adsorption of Cr(VI) on the surface of ACCW was a spontaneous adsorption process. The kinetics of this process was described very well by a pseudo-second-order rate equation. These results show that the ACCW could be considered as a potential adsorbent for Cr(VI) in aqueous solutions. © 2013 Balaban Desalination Publications.


Huang H.,Kunming Metallurgy College
Advances in Energy Science and Equipment Engineering - Proceedings of International Conference on Energy Equipment Science and Engineering, ICEESE 2015 | Year: 2015

In recent years, solvent extraction technology is applied more and more widely in zinc and copper solution in hydrometallurgy processing, but the research is far from enough. Under acid system and ammonia system, all kinds of extraction agents’ effects are different in the process of extraction. How to choose and develop an appropriate zinc/copper extraction agent according to a different solution becomes a valuable research direction. © 2015 Taylor & Francis Group, London.


Yang Y.H.,Kunming Metallurgy College
Applied Mechanics and Materials | Year: 2014

China has the biggest building construction market in the world today and it is growing at an explosive rate. At present, more than 85% of China's newly constructed buildings and more than 95% of the existing buildings are high energy consumption buildings. 1 Green building is undoubtedly a great emerging market for the Chinese building industry, green and clean technology and products are becoming rapidly growing market in China. Both the new green building construction and existing building's energy retrofit market will significantly grow in future. This paper discusses features of the green building development in China with respect to various aspects of the green building development situations, green building rating systems and its features so as to make further improvements. The discussion was refined based on literature reviews, requests for information from certification system owners, and interviews with certification system users and members of the industry advisory group. © (2014) Trans Tech Publications, Switzerland.


Zhou S.,Kunming Metallurgy College
Proceedings - 2010 International Forum on Information Technology and Applications, IFITA 2010 | Year: 2010

How to resolve the existence limitation of the traditional artificial immune detection system, how to realize the superiority complementarities of evolution algorithm about the traditional artificial immune detection technique, how to improve detection accuracy, efficiency and safety of system, in order to resolve these problems, the article has designed a model, which can mutually study by its learning robot among the different intrusion detection systems based on artificial immune principle. We define some concepts as following: e-learning, learning robot, suspected degree, backup rule storehouse and credible third party; and then give the logical structure of the primary intrusion detection system model, architecture of the artificial immune intrusion detection system based on e-learning and principle of the model;last explain and describe this mode and learning robot. © 2010 IEEE.


Yu L.-M.,Kunming Metallurgy College
Applied Mechanics and Materials | Year: 2014

A craft of carbothermic reduction-magnetic separation process is investigated for the recovery of iron from cyanide residues, a hazardous industrial wastes when produce gold with cyanide leaching method. The cyanide residues, containing 30.12% Fe was conducted for the craft. The results demonstrated that iron concentrate with 60.25% Fe and 79.85% of iron recovery was obtained under the optimal conditions (a reduction temperature of 950°C, a reduction duration of 60 min, a pulverized coal dosage of 10% and a potassium carbonate dosage of 4%).This craft can be used to utilize cyanide residues and produce qualified concentrate as iron-bearing feed for steel industry, which will help to solve the pollution of cyanide residues and extend raw material sourcing for Chinese steel industry. © (2014) Trans Tech Publications, Switzerland.


Yang Y.H.,Kunming Metallurgy College
Applied Mechanics and Materials | Year: 2014

China's unit energy consumption of building area is two to three times higher than the developed countries with similar climatic conditions. The heavy energy burden of building industry has become a constraint to sustainable development of China's economy. Green building is the inevitable choice to change the severe situation in China. Green building is undoubtedly a great emerging market for the Chinese building industry in terms of environmental responsibilities and market benefits. LEED is operated successfully in the U.S and globally. This paper represents the comparison of US-China green building practice with respect to various aspects of the two green building rating systems and their practice in construction. The comparison was refined based on literature reviews, requests for information from certification system owners, and interviews with certification system users and members of the industry advisory group. © (2014) Trans Tech Publications, Switzerland.


Pan H.B.,Kunming Metallurgy College
Applied Mechanics and Materials | Year: 2014

It is a new important research and applied field to create art by using computer technology. This article is primarily targeted to introduce a method which applies relevant theories and technology of Graphics and Image Processing, combined with the relevant skills and technique of Chinese painting and calligraphy to make a primary study on the simulation in writing strokes of Chinese withered pen calligraphy in the Digital Pen Simulated System of Painting and Calligraphy, and provides a pen pressure-sensitive mathematic model for the writing brush based on the mechanics principle. And also, we not only consider a lot of results in many experiments and the actual requirements of calligraphers and painters, but also characters of calligraphy and the writing strokes changes with the movement of brush to study the model of single cycle digital pen and the model of multi cycle withered pen, and make the bottom color of withered pen realized with Visual C++ 6.0. © (2014) Trans Tech Publications, Switzerland.


Zhou S.J.,Kunming Metallurgy College
Applied Mechanics and Materials | Year: 2014

Active defense technology may predict future attack situation and detect unknown attacks, but it has many questions to will be researched: vulnerability, lower mal-ware detection rate, security situation awareness technology has faced problem of inter-organization cooperation, real-time response, correlation analysis, high-load low fault tolerance. Artificial immune technology combines with active defense technology to solve integrated artificial immune security situation awareness system with artificial immune technology and active defense technology by Black Hole theory and for diversification ad development characteristics of the artificial immune and active defense, gives a method about simulating Black Hole accretion theory to achieve absorption and utilization a variety of security and virus technology; a no escaped mechanism simulate the Black Hole; a method about access control method based on Hawking radiation theory. Based on the above work, applies virtual and sandbox technology to achieve network system itself virus immunity, and then that we implement re-engineering and reverse engineering for virus technology in order to study virus and dig more holes, create unified integrated defense tactics, so this defense system will improve ability of situation comprehension, situation prediction and intelligence decision. © (2014) Trans Tech Publications, Switzerland.

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