Shen L.-J.,China Society of Engineering Blasting |
Shen L.-J.,China Metallurgical Industry Planning and Research Institute |
Ma A.-E.,China Aerospace Science and Technology Corporation |
Wang X.-G.,China Society of Engineering Blasting |
And 2 more authors.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2014
To analyze and compare the thermal stability of commercial ammonium nitrate (AN) and homemade non-explosive and irrestorable fertilizer-grade ammonium nitrate (NEIFAN), the crystal transformation changes, thermal decomposition characteristics and adiabatic decomposition processes of AN and NEIFAN were studied by thermogravimetry(TG)-differential thermal analysic(DTA)-derivative thermogravimetry(DTG), differential scanning calorimetry (DSC) and accelerating rate calorimetry (ARC). The curves of thermal decomposition temperature and pressure vs time, self-heating rate and pressure vs temperature for AN and NEIFAN under the adiabatic decompositions condition were obtained. The kinetic parameters(apparent activation energy and pre-exponential factor)of pseudo zero order adiabatic decomposition reaction for AN and NEIFAN were calculated. The results show that in comparison with AN, the crystal transformation peak at about 88℃ of NEIFAN disappears, revealing that NEIFAN has better thermal physical stability. The decomposition peak temperature of NEIFAN obtained by TA-DTA-DTG and DSC curves and the apparent activation energy of the pseudo zero order adiabatic decomposition reaction of NEIFAN obtained by ARC data are much higher than those of AN, indicating that NEIFAN has a higher heat-resistance ability than AN. Considering that the increase of physicochemical stability of NEIFAN is attributed to the joint action of inorganic and organic additives in NEIFAN.
Li K.,University of Science and Technology Beijing |
Li K.,University of Toronto |
Zhang J.,University of Science and Technology Beijing |
Liu Y.,University of Science and Technology Beijing |
And 7 more authors.
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2016
Coke reaction behavior in the blast furnace hearth has yet to be fully understood due to limited access to the high temperature zone. The graphitization of coke and its interaction with slag in the hearth of blast furnace were investigated with samples obtained from the center of the deadman of a blast furnace during its overhaul period. All hearth coke samples from fines to lumps were confirmed to be highly graphitized, and the graphitization of coke in the high temperature zone was convinced to start from the coke surface and lead to the formation of coke fines. It will be essential to perform further comprehensive investigations on graphite formation and its evolution in a coke as well as its multi-effect on blast furnace performance. The porous hearth cokes were found to be filled up with final slag. Further research is required about the capability of coke to fill final slag and the attack of final slag on the hearth bottom refractories since this might be a new degradation mechanism of refractories located in the hearth bottom. © 2016 The Minerals, Metals & Materials Society and ASM International
Lu X.,University of Science and Technology Beijing |
Lu X.,China Metallurgical Industry Planning and Research Institute |
Song C.,University of Science and Technology Beijing |
Tong Z.,University of Science and Technology Beijing |
Xie N.,Norendar International Ltd.
Chinese Journal of Environmental Engineering | Year: 2015
Deduced calculating method of heat and mass conductions was used to obtain the relationship between cooling and humifying, and to achieve precise humidification of dense flow absorber semidry flue gas desulphurization(DFA-FGD), then to improve the desulfurization efficiency. Combined with actual data from three DFA-FGD projects in Hebei Province, the error range between theoretical and actual values was only 2.9%~5.4%. The actual online test data from one steel DFA-FGD project of 210 m2 in Hebei Province showed that the overall desulfurization efficiency of cycling desulfurization ash of 3% moisture content was higher than the samples of 5% and 4% moisture content, and maximum value was 93.56%. The cycling desulfurization ash with the different moisture contents were characterized by particle size analysis, scanning electron microscopy, X-ray diffraction and thermogravimetric analysis and differential thermal analysis, the results indicated that cycling desulfurization ash of 3% moisture content had smaller particle size and larger surface area, and showed no agglomeration compared to the sample of 5% moisture content. Relative to the sample of 5% moisture content, cycling desulfurization ash of 3% moisture content contained less Ca(OH)2 and crystal water, most of which was dry matter, such as CaSO4 and CaSO3. Therefore, cycling desulfurization ash of 3% moisture content hold higher desulfurization and more thorough desulfurization reaction. ©, 2015, Science Press. All right reserved.
Li X.-Y.,University of Science and Technology Beijing |
Su B.-X.,China Metallurgical Industry Planning and Research Institute |
Xia L.-G.,University of Science and Technology Beijing |
Zhang J.-L.,University of Science and Technology Beijing |
Guo H.-W.,Soochow University of China
Journal of Iron and Steel Research International | Year: 2015
Under the pressures of both the decrease of high-grade high-quality iron ore resources and the increase of raw material costs, the iron and steel enterprises in China turn to adopt iron ores which contain special elements such as nickel, manganese, etc. in the sintering blend. Analytical reagents were used for sintering experiments, and the sinters were analyzed with X-ray diffraction, scanning electron microscopy and mineralogical microscopy to study the effect of nickel on the silico-ferrite of calcium and aluminum (SFCA) bonding phase formation during sintering. The results indicated that SFCA was divided into nickel-containing and nickel-free areas due to the presence of nickel. The increasing content of nickel would greatly reduce the content of SFCA and promote the formation of calcium aluminum silicate. A great deal of Fe2O3 participated in the crystal transition to Fe3O4, reducing the amount of Fe2O3 involved in the formation of calcium ferrite. When the blending ratio of NiO, which is used to provide the nickel in the sintering process, is less than 3%, the calcium ferrite is in substantially interleaving corrosion with hematite and magnetite. Both the porosity and silicate glass phase content are low, which contributes to the sintering production. © 2015 Central Iron and Steel Research Institute.
Guo H.,Soochow University of China |
Su B.,China Metallurgical Industry Planning and Research Institute |
Bai Z.,University of Science and Technology Beijing |
Zhang J.,University of Science and Technology Beijing |
Li X.,University of Science and Technology Beijing
JOM | Year: 2014
The traditional artificial recognition methods for the blast furnace dust composition have several disadvantages, including a great deal of information to dispose, complex operation, and low working efficiency. In this article, a multifeature analysis method based on comprehensive image-processing techniques was proposed to automatically recognize the blast furnace dust composition. First, the artificial recognition and feature analysis, which included image preprocessing, Harris corner feature, Canny edge feature, and Ruffle feature analysis, was designed to build the template image, so that any unknown dust digital image could be tested. Second, the composition of coke, microvariation pulverized coal, vitric, ash, and iron from dust would be distinguished according to their different range of values based on the multifeature analysis. The method is valid for recognizing the blast furnace dust composition automatically, and it is fast and has a high recognition accuracy. © 2014, The Minerals, Metals & Materials Society.
Zhao H.-B.,University of Science and Technology Beijing |
Bai Y.-Q.,China Metallurgical Industry Planning and Research Institute |
Cheng S.-S.,University of Science and Technology Beijing
Journal of Iron and Steel Research International | Year: 2013
Reasonable control on CRI (coke reaction index) is one of the key factors for BF (blast furnace) low-carbon smelting. However, there are contrary opinions. One is increasing CRI to improve reaction efficiency in BF and the other is decreasing CRI to suppress coke degradation in furnace. Different methods are adopted to realize effective catalysis (increasing CRI) and passivation (decreasing CRI) of coke. Simulation tests of coke in BF lumpy zone under gradual temperature rising have been done. Effect of CRI on gas composition, ore reduction, burden column permeability and heat reserve zone's temperature under non-isothermal condition are studied. Then combined with iron making calculations, a novel BF operation suggestion is proposed as coke nut with small size be catalyzed and mixed with ore while skeletal coke with large size be passivated and separately charged into BF. © 2013 Central Iron and Steel Research Institute.
Tu X.,University of Science and Technology Beijing |
Tu X.,Dongfang Electrical Group Dongfang Boiler Co. |
Li T.,University of Science and Technology Beijing |
Shi C.,China Metallurgical Industry Planning and Research Institute
Jisuanji Jicheng Zhizao Xitong/Computer Integrated Manufacturing Systems, CIMS | Year: 2016
To solve the tardiness-problem caused by unqualified product which affected by dynamic factors, such as equipment failure, staff skills and raw material defects, a dynamic substitute model was presented by considering the minimized delay time and substitute-times among orders. According to the characteristics of problem, it was proved as NP complete problem. A dynamic product substitute algorithm based on some substitute rules was proposed among orders of different agreed delivery dates. The effectiveness of algorithm was tested based on simulation, and the results showed that the algorithm could get optimal solution to meet production requirements. At the same time, the effect on total delay time and substitute times was compared when product categories, batch-size and order-size were changed. © 2016, Editorial Department of CIMS. All right reserved.
Lin H.,University of Science and Technology Beijing |
Cheng L.,China Metallurgical Industry Planning and Research Institute |
Hu Q.,University of Science and Technology Beijing
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2010
10 strains, capable of degrading and decolorizing bromamine acid under high salt conditions, which is an intermediate of anthraquinone dye, were isolated from the biomembrane of a bio-contact oxidation tank. A strain named C-7 which has good decolorizing effect and stable decolorization ability was obtained by acclimating the 10 strains. It was identified as Citrobacter freundil. Salt tolerance test results show that the strain C-7 can grow with a decolorization rate of more than 80% when the mass fraction of NaCl is 1% to 3%, and NaCl has no effect on the growth and decolorization of the strain. When the mass fraction of NaCl is 7%, C-7 show high tolerance and the decolorization rate is more than 50%. NaCl can inhibit the growth of the strain C-7 and bromamine acid cannot be degraded when the mass fraction increases to 10%. Under the optional growth conditions of pH 7.0, the rotating rate of 160 r · min -1, the liquid volume of 120 mL in a 250 mL flask, inocula of 10% and peptone of 7 g · L -1 as the only nitrogen source, when the mass fraction of NaCl is 1%, the decolorization rate of bromamine acid (100 mg · L -1) can reach to 85% or higher.
Liu X.,Japan Building Research Institute |
Gao X.,China Metallurgical Industry Planning and Research Institute
Journal of Cleaner Production | Year: 2016
This study estimates how carbon price affects diffusion of low carbon technologies using data collected from 60 iron & steel companies in China. The analysis indicates that the industry is familiar with related key energy saving and low carbon technologies and has made much progress in energy saving, but efforts in carbon management need improving. An average payback time threshold of 4.1 years was found as regards decision in invest in technology. The three target technologies were adopted by companies to different extents. Carbon emissions pricing was found to be ineffective in promoting the scale-up or further adoption of economically advantageous technologies such as dry top pressure recovery turbine (Dry TRT) and energy management centre (EMC) technology. A moderate carbon price for sintering waste heat recovery power generation (Sintering WHR), which has adoption potential in China's iron & steel industry, may generate comparatively significant effects for diffusion. This research sheds light on how diffusion of low carbon technologies would be affected and the consequences thereof on climate policy development for the target sector in China. © 2016 Elsevier Ltd. All rights reserved.
Li X.-C.,China Metallurgical Industry Planning and Research Institute |
Shi C.-T.,China Metallurgical Industry Planning and Research Institute |
Zhao F.,China Metallurgical Industry Planning and Research Institute
Kang T'ieh/Iron and Steel | Year: 2015
Industry 4.0 is systematically discussed about its emergence background, connotation, advantages and potential effects, as well as the development in some typical countries. The current situation of integration of informatization and industrialization in China iron and steel industry is analyzed while the defects are summarized. The positive influence of Industry 4.0 on China iron and steel industry is presented in respects of customized service, intelligent manufacture, big data management, and supply chain integration. The strategic key points of Steel 4.0 are described hierarchically, and some advice is proposed systematically. © 2015, Chinese Society for Metals. All right reserved.