Xiao Y.,Tsinghua University |
Wang H.,Tsinghua University |
Xu W.,Tsinghua University |
Zhou J.,Beijing General Research Institute of Mining And Metallurgy
Pattern Recognition | Year: 2013
Novelty detection is a one class classification problem, and it builds up the model with only normal samples, based on which the novelty is detected. Though conventional KPCA is an effective method of building one class classification models, it is prone to being affected by the presence of outliers due to its inherent properties of L2 norm. In this paper, we propose a new optimization problem, L1 norm based KPCA, which is robust to outliers. Correspondingly, we present the algorithm and the measure of novelty. The proposed method is applied to novelty detection and performs well on the simulation data sets. © 2012 Elsevier Ltd All rights reserved.
Xu G.-Q.,Shenyang University |
Xu G.-Q.,Beijing General Research Institute of Mining And Metallurgy |
Xiong D.-Y.,Beijing General Research Institute of Mining And Metallurgy
Chinese Optics | Year: 2013
This article introduces a systematic review of recent progress in applications of Fiber Bragg Grating(FBG) sensors to Structural Health Monitoring(SHM), oil industry, electrical power industry, geotechnical engineering, aerospace , mine, blasting, traffic, medicine, etc. It points out that the lacks of unified theories and standard technolgies lead to different product specifications for the Bragg grating sensors from different manufacturers, which limits the industrialization and large scale application of the sensing technology. Furthermore, because of their complex and fine manufacturing technologies, the Bragg grating sensors have a higher production cost. Most importantly, the demodulation products are far from enough although many demodulation methods have already been published. On the analysis above, the paper presents its future work.
Zhang D.,Beijing General Research Institute of Mining And Metallurgy
Advanced Materials Research | Year: 2013
In this research, a sequential sol-thermal route has been used to prepare the SnO2 nano-colloid, Pt nano particles were then deposited on the nano-support to obtain the Pt-SnO2/MWCNTs. The electrochemical performances of the catalysts were characterized by cyclic voltammetry and chronoamperometry. The Pt (fcc) crystalline was proved to be form on the surface of carbon nano-tubes. The Pt based catalyst modified by tin oxides exhibit a electro-chemical performance for methanol electro-oxidation. © (2013) Trans Tech Publications, Switzerland.
Cao L.,Beijing General Research Institute of Mining And Metallurgy
Applied Mechanics and Materials | Year: 2014
In this paper, for the re-concentration of sliming molybdenum Tailings in Henan Province, a multi-parameter test is carried out using orthogonal method in the column flotation system with the ultrasonic pre-treatment. Two groups’ optimum parameters of ultrasonic pre-treatment are acquired through the analysis of orthogonal test results. In addition, those two groups parameters are selected to verify the test results. Furthermore, the impact of ultrasonic pre-treatment on the floatability of mineral are defined by comparison tests. All the tests show that ultrasonic pre-treatment promotes the flotation of sliming molybdenum tailings. © (2014) Trans Tech Publications, Switzerland.
Zhang Y.,Central South University |
Wang Y.,Central South University |
Li S.,Beijing General Research Institute of Mining And Metallurgy
International Journal of Mining Science and Technology | Year: 2012
The flotation separation of scheelite from fluorite and calcite using dodecyltrimethylammonium chloride (DTAC), dodecyldimethylbenzylammonium chloride (DDBAC), or didodecyldimethylammonium chloride (DDDAC) as the collector has been investigated. The results show that the selectivity of these collectors for these three calcareous minerals falls in the order: DDDAC > DDBAC > DTAC. A significantly different flotation response of scheelite compared to the other two calcareous minerals was observed over the pH range from 7 to 8 for DDDAC as the collector. A concentrate containing 41.40% WO 3 could be produced from a feed mixture containing 23.22% WO 3 at the DDDAC concentration of 4.0 × 10 -4 mol/L. The WO 3 recovery was 92.92% under these conditions. The results of zeta potential measurements suggest that electrostatic interactions are the main forces between DDDAC and the minerals. When the concentration of DDDAC is from 2 × 10 -4 to 4 × 10 -3 mol/L large differences in adsorption density, and adsorption kinetics, of DDDAC onto scheelite, calcite, and fluorite provide desirable conditions for achieving high selectivity. © 2012 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
Lu S.,Beijing General Research Institute of Mining And Metallurgy
XXV International Mineral Processing Congress 2010, IMPC 2010 | Year: 2010
This complex Cu-Pb-Co-Ni multi-metal sulfide ore in Australia has a fine dissemination size, and there is a very close symbiotic relationship among sulfide minerals, and between sulfide minerals and gangues, which makes beneficiation difficult. And high content of carbon is also a difficulty for mineral processing. Based on research of process mineralogy, a new process flow of 'C flotation - Cu- Pb-Co bulk flotation -Co flotation for tailing, cleaning for concentrate - regrinding - C 2nd flotation - Cu, Pb, Co separation' is determined. The lock-cycled test achieved test indexes as following: Pb concentrate: Pb grade 55.50 per cent, Pb recovery 56.92 per cent, Co-bearing 0.58 per cent, Co recovery 22.04 per cent, Cu-bearing 3.76 per cent; Cu-Co bulk concentrate: Cu grade 6.41 per cent, Cu recovery 50.77 per cent, Co grade 0.94 per cent, Co recovery 40.95 per cent, Pb-bearing 12.91 per cent, Pb recovery 15.24 per cent; Co concentrate: Co grade 0.35 per cent, Co recovery 14.00 per cent, Cu-bearing 1.29 per cent, Pbbearing 8.90 per cent; Above results indicate that the process flow used in this paper is suitable for this complex multimetal sulfide ore in Australia because Cu, Co, Pb especially Co can be recovered effectively, and it is also a harmonious technology method for this ore.
Li Q.,Beijing General Research Institute of Mining And Metallurgy
Legislation, Technology and Practice of Mine Land Reclamation - Proceedings of the Beijing International Symposium Land Reclamation and Ecological Restoration, LRER 2014 | Year: 2015
At present the heavy metal pollution soil repair technology mainly includes physical methods, chemical methods and biological methods. The physical methods mainly includes soil replacement, soil separation, soil isolation and thermodynamics method. The chemical methods mainly includes chemical fix, soil wash and electrical repair. The biological methods mainly includes plant stable, plant volatile, plant extract, microbial repair and soil animal repair. This paper briefly introduced the principle, advantages and disadvantages, and applicability of each soil repair method. © 2015 Taylor & Francis Group, London.
Ding Y.,Capital Normal University |
Jing D.,Capital Normal University |
Gong H.,Capital Normal University |
Zhou L.,Beijing General Research Institute of Mining And Metallurgy |
Yang X.,Beijing General Research Institute of Mining And Metallurgy
Bioresource Technology | Year: 2012
Cadmium is the most common toxic metal threatening safe rice supply. Rice straw has the potential to remove Cd from large-scale effluent contaminated by heavy metals since it exhibited a short biosorption equilibrium time of 5min, high biosorption capacity (13.9mgg -1) and high removal efficiency at a pH range of 2.0-6.0. The main Cd biosorption mechanism was Cd 2+ ion exchange with K +, Na +, Mg 2+ and Ca 2+, together with chelation with functional groups such as CC, CO, OH and carboxylic acids. When 0.5% (w/v) rice straw was exposed to 50mgmL -1 CdSO 4 solution with shaking at 150rmin -1 for 3h, about 80% of the aquatic Cd was absorbed and the Cd content in rice straw reached 8-10mgg -1, suggesting that the metal-enriched rice straw could become high quality bio-ore by virtue of the industrial mining grade of its metal content and easy metal recovery. © 2012 Elsevier Ltd.
Jiang Y.,Beijing General Research Institute of Mining And Metallurgy
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012
As uncertainties inherent factors, such as temperature and wear, always exist during wet multi-disc brake's lifetime, a time-dependent model was established, which incorporating such uncertainties based on stochastic differential equation theory. The time-dependent design method for wet multi-disc brake under such external uncertainties factors was presented. This method takes the braking distance and temperature changes with time into account. It can evaluate dynamic security reliability for wet multi-disc brake products, which reflects the impact of time scale in the design. The brake that can meet the reliability requirements at any time can be designed by the new method, which can provide a reference for dynamic security assessment of brakes reliability.
Yong J.,Beijing General Research Institute of Mining And Metallurgy
Applied Mechanics and Materials | Year: 2013
In this paper, out-moving jaw crusher machine is regarded as the research object and we established the simulation model of virtual prototype based on Nastran. Through the simulation analysis of the movement process, trajectories of moving jaw side plate and a movable jaw toggle plate and related parameters were obtained and compared and verify the simulation model and theory model. The results show that: the simulation model reflects the motion characteristics of the theoretical model well. So it provides theoretical reference for improvement of dynamic performance analysis and structure design of jaw crusher and has important application value in engineering. © (2013) Trans Tech Publications, Switzerland.