Papers by Keyword: Sinter

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Authors: Xiao Ting Liu, Bao Dong Wang, Yong Feng Xiao, Xiao Huan Wang, Li Jun Zhao, Geng Zhi Yu, Qi Sun
Abstract: Generated during the combustion of coal for electricity production, fly ash is a solid waste and causes great ecomomic burden and serious environmental pollution. On the other hand, it is a good resource for the preparation of industrial products. Especially, alumina rich fly ash from Inner-Mongolia Guohua Junggar Power Plant typically contains 45-55% alumina, 30-40% silica, and 5-10% other metallic oxides, it is a perfect resource for alumina extraction. In order to improve the utilization value of alumina rich fly ash and lessen environmental strain, a novel approach for alumina extraction from alumina rich fly ash was proposed. The proposed process includes a pre-desilication process, soda lime sintering process, dissolving process, carbonation process and calcination process. The technological conditions for alumina extraction from Junggar alumina rich fly ash were optimized by means of orthogonal experment design. The extraction rate of alumina was 96%. Value-added products, such as electrolytic grade alumina and white carbon black, were produced at the same time.
Authors: Jian Chang, Bu Xin Su, Jian Liang Zhang, Wei Chao Cao, Hong Wei Guo, Shan Ren
Abstract: Sintering burdening optimization has great value in reducing sintering cost and improving sinter qualities. Considering the nonlinear relationship between the high temperature characteristic parameters of iron ores in sintering, this article introduces the simulated annealing algorithm into burdening calculation and establishes a mathematic model of sintering burdening optimization. The initial parameters in simulated annealing algorithm are determined through tentative experiments, including initial temperature, cooling function, annealing constant and the end condition. The model can effectively reduce sintering cost and improve sinter qualities in its practical use.
Authors: Shan Shan Wei, Yi Ping Tian, Qiang Cheng, Hui Li, Ling Hong Guo
Abstract: Calcium polyphosphate (CPP) bioceramics with different Ca/P ratios were fabricated. It was shown that the contents of CPP in the sintered ceramics decrease with the increasing Ca/P ratios (0.5-1.0) of the precursors. The higher the Ca/P ratios of precursors were, the more complex the phases of polymerization were. The compressive strengths of ceramics sintered at the same temperature showed a linear decreasing tendency with the increasing Ca/P ratio.
Authors: Zhi Min Cui, Rong Li Sang, Yuan Liang Li, Qing Jun Zhang
Abstract: Multifractal spectrums of sinter with different alkalinity were analyzed by multifractal software. The results show that sinter pore structure change from uniform to non-uniform with the improvement of alkalinity, Δα increases from 0.53 to 0.55. The structure of sinter pore is mainly microscopic by competition between macropores and micropores, Δf changes from 0.14 to-0.44. The distribution of sinter pores is quantitatively characterized by multi-fractal spectrum, which is consistent with transmission electron microscopy image.
Authors: Andrey N. Dmitriev, R.V. Petukhov, G.Yu. Vitkina, Alexey V. Dolmatov, L.A. Ovchinnikova
Abstract: The questions of oxidizing roasting of iron ore raw materials with production sinter and pellets are considered. The question of reduction roasting of iron ore raw materials is studied. Phase transformations of oxidizing and regenerative roasting are considered. Features of phase transformations of iron ore raw materials containing titanium are discussed. The reducibility, durability and temperatures of softening and melting of metallurgical iron ore raw materials are studied In Vitro. The effect of the durability of burned iron ore pellets on compression is also defined.
Authors: Chang Ying Zhou
Abstract: Sinter as an intermediate product of the iron making, is a multiphase medium, and the microstructure of finished sinter directly affects the quality of sinter. But because the sinter micro structure of the extreme irregularities, it is difficult to use the traditional quantitative methods on the accurate description, the introduction of the fractal theory provides us with new ideas. According to the characteristics of sinter SEM photos, and used the VC++ computer programming language, it is researched and designed that the fractal dimension of calculation program (FWJS) based on the sinter SEM microscopic photos, through which got the fractal dimension value and describe the microscopic structure of the sample quantificationally, which has very important practical significance for the fractal research of sinter .
Authors: Yukinori Yamamoto, Jim O. Kiggans, Michael B. Clark, Stephen D. Nunn, Adrian S. Sabau, William H. Peter
Abstract: This paper summarizes our recent efforts to develop the manufacturing technologies of consolidated net-shape components by using new low-cost commercially pure titanium (CP-Ti) and Ti-6Al-4V alloy powders made by the Armstrong process. Fabrication processes of net shape/ near net shape components, such as uniaxial die-pressing, cold isostatic pressing (CIP), sintering, roll compaction and stamping, have been evaluated. The press-and-sinter processing of the powders were systematically investigated in terms of theoretical density and microstructure as a function of time, pressure, and temperature. Up to 96.4% theoretical density has been achieved with the press-and-sinter technology. Tensile properties of the consolidated samples exhibit good ductility as well as equivalent yield/ultimate tensile strengths to those of fully consolidate materials, even with the presence of a certain amount of porosity. A consolidation model is also under development to interpret the powder deformation during processing. Net shape components made of the Armstrong powder can successfully be fabricated with clearer surface details by using press-and-sinter processing.
Authors: Yan Qin Sun, Dong Hui Liu, Li Yuan Sun, Qing Lv, Ran Liu
Abstract: The content and stability of FeO in sinter are the important comprehensive indicators to assessing the sintering production. They not only reflect the quality and energy consumption of agglomerates, but also influence the smelting results of blast furnace. The effects of the FeO content of original ores on the FeO content in sinter and the creating ability of calcium ferrite are discussed in this paper. The results show that the content of FeO in sinter of hematite is much lower than magnetite. With the increasing of the FeO content of original ore, the FeO content in sinter increases but the content of calcium ferrite gets low, and the quantity of bonding phase hasn't apparently change.
Authors: Xiang Wei Li, Ling Kun Chen, Wei Wang
Abstract: High level coal injection increases hydrogen of the gas in the blast furnace shaft, which changes the reduction behavior of sinter. This paper investigates the effect of hydrogen addition on reduction of sinter. Experiments of the sinter reduction in different content of hydrogen had been made. The experimental results show that the reduction rate increases with the hydrogen content increase in the reducing gas.
Authors: Guo Feng Lou, Zhi Wen, Xun Xiang Liu, Xin Zhang, Kun Chan Zheng
Abstract: In the paper, a 1-D unsteady mathematical model is used to analyze the cooling process of high temperature sinter. The modeling result is compared with measured data, and the agreement is good. The effect of sinter particle size and void fraction on the cooling process of the annular cooler has been investigated.
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