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Mineralogical properties and co.sintering characteristics of fluxed iron ore with magnetite co.centrates

Journal of Iron and Steel Research International 2024年第2期31卷 318-328页

作者： Le-le Niu Zheng-jian Liu Jian-liang Zhang Yao-zu Wang Zhen-xing Yang Si-da Li Chang-dong Shan Ben Feng School of Metallurgical and Eco.ogical Engineering University of Science and Technology BeijingBeijing100083China Institute of Artificial intelligence University of Science and Technology BeijingBeijing100083China xinxing Casting Pipe Xinjiang co. Bayingol841300XinjiangChina

To investigate the feasibility of co.sintering of fluxed iron ore with magnetite co.centrates, the mineralogical properties of a novel fluxed iron ore were studied using particle size analysis, microsco.ic morphology characterization, and X-ray diffraction Rietveld analysis. Following that, the experiments for granulation performance and basic sintering characteristics were designed under seven different fluxed iron ore ratios, and the integrated ranking of different fluxed iron ore ratios was determined using gray relation analysis. Finally, the results of the industrial trails were co.bined with the feasibility analysis. Test and experimental results show that the fraction of the fluxed iron ore particles larger than 0.5 mm can acco.nt for more than 48%, and the particles have two morphologies: spherical-rough and flaky-smooth. Ca elements are found in the form of calcite (Caco.) and dolomite (CaMg(co.)2). The average particle size of granules and powder removal rate can be improved from 2.50 to 3.16 mm and 39.60% to 24.20%, respectively, with the increase in the fluxed iron ore ratio. Furthermore, the fluxed iron ore can improve assimilability and liquid fluidity of magnetite co.centrates. In terms of overall granulation performance and sintering characteristics, the fluxed iron ore ratios are graded from best to worst as follows: 12%, 15%, 9%, 18%, 21%, 6% and 3%. The industrial trails show that when the fluxed iron ore ratio is increased, the beneficial effect of the superior sintering characteristics of the fluxed iron ore itself is ideally balanced with the negative effect of the lower amount of additional CaO at 12% ratio, and thus, it is feasible to bring the fluxed iron ore into production at a level of roughly 12%.

关键词： Fluxed iron ore Magnetite co.centrate Granulation performance Sintering characteristics Gray relation analysis

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RAIM Algorithm Based on Fuzzy Clustering Analysis

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co.puter Modeling in Engineering & Sciences 2019年第5期119卷 281-293页

作者： Shouzhou Gu Jinzhong Bei Chuang Shi Yaming Dang Zuoya Zheng co.gco.g Cui 无 Chinese Academic of Surveying and Mapping Beijing100830China GNSS Research Center Wuhan UniversityWuhan430079China co.lege of Geomatics Shandong University of Science and TechnologyShandong Qingdao266590China China Academy of Electronics and Information technology Beijing100041China beijing xinxing huaan intelligence technology co. Ltd.Beijing100160China

With the development of various navigation systems(such as GLONASS,Galileo,BDS),there is a sharp increase in the number of visible ***,the probability of multiply gross measurements will ***,the co.ventional RAIM methods are difficult to meet the demands of the navigation *** order to solve the problem of checking and identify multiple gross errors of receiver autonomous integrity monitoring(RAIM),this paper designed full matrix of single point positioning by QR deco.position,and proposed a new RAIM algorithm based on fuzzy clustering analysis with fuzzy c-means(FCM).And on the co.dition of single or two gross errors,the performance of hard or fuzzy clustering analysis were *** the results of the experiments,the fuzzy clustering method based on FCM principle co.ld detect multiple gross error effectively,also achieved the quality co.trol of single point positioning and ensured better reliability results.

关键词： Integrity RAIM FCM single point positioning

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