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Mineralogical properties and co-sintering characteristics of fluxed iron ore with magnetite concentrates

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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 Ecological 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 concentrates, the mineralogical properties of a novel fluxed iron ore were studied using particle size analysis, microscopic 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 combined with the feasibility analysis. Test and experimental results show that the fraction of the fluxed iron ore particles larger than 0.5 mm can account for more than 48%, and the particles have two morphologies: spherical-rough and flaky-smooth. Ca elements are found in the form of calcite (CaCO3) and dolomite (CaMg(CO3)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 concentrates. 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 concentrate Granulation performance Sintering characteristics Gray relation analysis

Proposing a machine learning approach to analyze and predict basic high-temperature properties of iron ore fines and its factors

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Journal of Iron and Steel Research(International) 2024年第5期31卷 1082-1094页

作者： Qing-ke Sun Yao-zu Wang Jian-liang Zhang Zheng-jian Liu le-le niu Chang-dong Shan Yun-fei Ma Institute of Artificial Intelligence University of Science and Technology BeijingBeijing100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

The basic high-temperature properties of iron ore play a crucial role in optimizing sintering and ore blending,but the testing process for these properties is complex and has significant lag time,which cannot meet the actual needs of ore blending.A prediction model for the basic high-temperature properties of iron ore fines was thus proposed based on a combination of machine learning algorithms and genetic ***,the prediction accuracy of different machine learning models for the basic high-temperature properties of iron ore fines was ***,a random forest model optimized by genetic algorithms was built,further improving the prediction accuracy of the *** test results show that the random forest model optimized by genetic algorithms has the highest prediction accuracy for the lowest assimilation temperature and liquid phase fluidity of iron ore,with a determination coefficient of 0.903 for the lowest assimilation temperature and 0.927 for the liquid phase fluidity after *** trained model meets the fluctuation requirements of on-site testing and has been successfully applied to actual production on site.

关键词： Iron ore Basic high-temperature property Machine learning Random forest Genetic algorithm

Carbon uptake by cement in China:Estimation and contribution to carbon neutrality goals

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Science China Earth Sciences 2024年第6期67卷 2056-2067页

作者： Mingjing MA Zi HUANG Jiaoyue WANG le niu Wenfeng ZHANG Xiaowei XU Fengming XI Zhu LIU Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Department of Earth System Science Tsinghua UniversityBeijing 100084China Department of Engineering Science University of OxfordOxfordOX13UK

Cement is a widely used construction material *** manufacturing contributes to anthropogenic CO_(2)emissions ***,its alkaline compounds can absorb CO_(2)from the surrounding environment and engage in a carbonation reaction,thereby functioning as a carbon *** a major cement producer and consumer,China has an important responsibility to rigorously investigate and accurately account for cement carbon *** study presents a comprehensive analytical model of cement carbon uptake from China,revealing a substantial increase in carbon uptake from 1930 to 2021,peaking at 426.77 Mt CO_(2)(95% Confidence Interval:317.67-874.33 Mt CO_(2))in *** uptake accounts for 8.10% to 45.40% of China’s annual land sink and 2.51% to 4.54% of the global land *** cumulative carbon uptake by cement is approximately 7.06 Gt CO_(2)(95%CI:5.22–9.44 Gt CO_(2))during this period,offsetting 50.7% of the total emissions(13.91 Gt CO_(2),95%CI:12.44–17.00 Gt CO_(2))from the cement ***,cement mortar contributed to most absorption(65.64%).From a life cycle perspective,the service stage of cement materials is the period where the largest CO_(2)sink is formed,accounting for 90.03% of the ***,the potential for carbon sequestration in cement materials and their waste is ***,the model improves the accuracy of cement carbon accounting,supporting both China and global carbon neutrality ***,it is crucial for China to achieve its carbon neutrality goals sooner by prioritizing the environmental benefits of cement materials and wastes,and accelerating the development and commercialization of CO_(2)sequestration technologies for cement and its by-products.

关键词： Cement Carbon uptake Life cycle assessment Carbon emission reduction Carbon neutrality

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非物质文化遗产的本体论阐释

文化遗产 2024年第4期 1-8页

作者：牛乐西北民族大学美术学院甘肃兰州730030

非物质文化遗产具有阐释学意义上的本体性,突出表现为人、物、世界在社会化阐释语境中的互构效应,这是一种基于差异本体(身份、身体)重新与世界建立联系的本体论进路,为人类学、社会学等多学科研究提供了一种新的范式和价值起点。探究... 详细信息

非物质文化遗产具有阐释学意义上的本体性,突出表现为人、物、世界在社会化阐释语境中的互构效应,这是一种基于差异本体(身份、身体)重新与世界建立联系的本体论进路,为人类学、社会学等多学科研究提供了一种新的范式和价值起点。探究非物质文化遗产的本体价值并不代表其实践性被否定,而意味着从丰富的生活世界和经验研究中对相关理论概念和知识范畴的再抽取。

关键词：非物质文化遗产哲学转向本体论阐释学

华夏元图像的知识史考察——以龙凤图像为中心

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云南艺术学院学报 2024年第2期 53-58页

作者：牛乐覃壮航西北民族大学美术学院

在中华传统文化体系中,龙、凤图像具有深刻的元图像内涵,具有自我指涉和自我言说性。从二者生成的知识史分析,龙凤之“象”与“像”之间存在着符号互构性,“像”衍生于“象”,又反释“象”,其二元互生的模式呈现了中华文化符号的社会建... 详细信息

在中华传统文化体系中,龙、凤图像具有深刻的元图像内涵,具有自我指涉和自我言说性。从二者生成的知识史分析,龙凤之“象”与“像”之间存在着符号互构性,“像”衍生于“象”,又反释“象”,其二元互生的模式呈现了中华文化符号的社会建构性与深层文化逻辑,体现出中华物质生活与精神世界互构交融的逻辑内核。

关键词：元图像知识史图像学造物

2020年卓尼县集中式供水水质及影响因素分析

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疾病预防控制通报 2024年第1期39卷 57-59,64页

作者：牛乐宇李盛王金玉兰州市疾病预防控制中心兰州730030 兰州市肺科医院兰州730046 兰州大学基础医学院兰州730000

目的了解甘肃省甘南藏族自治州卓尼县城乡饮用水水质现状并分析影响因素,为保障居民饮水安全提供科学依据。方法2020年采集卓尼县94份城乡集中式供水水样,检测4项微生物指标、11项毒理学指标、18项感官性状和一般化学指标,分析水质现状... 详细信息

目的了解甘肃省甘南藏族自治州卓尼县城乡饮用水水质现状并分析影响因素,为保障居民饮水安全提供科学依据。方法2020年采集卓尼县94份城乡集中式供水水样,检测4项微生物指标、11项毒理学指标、18项感官性状和一般化学指标,分析水质现状及影响因素。结果94份水样合格率为56.4%,所有水样均未消毒;89.4%(84/94)的水样无任何处理,10.6%(10/94)的水样仅沉淀过滤。水样不合格指标主要为总大肠菌群、菌落总数、氟化物、pH、硫酸盐、溶解性总固体、总硬度,合格率为63.8%~95.7%,以总大肠菌群合格率最低63.8%。水样总合格率和总大肠菌群合格率枯水期分别为71.1%和75.6%,高于丰水期的总合格率42.9%(χ^(2)=7.614)和总大肠菌群合格率53.1%(χ^(2)=5.141),差异均有统计学意义(P<0.05)。结论卓尼县城乡集中式供水水质欠佳,尤其在丰水期;微生物污染是水质不合格的主要影响因素,其次为地质因素;需加强饮用水消毒、软化措施。

关键词：水质集中式供水末梢水

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面向碳中和的设施栽培研究进展--基于CiteSpace可视化分析

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土壤通报 2024年第1期55卷 231-241页

作者：张文凤尹岩郗凤明王娇月邴龙飞胡琴琴马铭婧牛乐中国科学院沈阳应用生态研究所辽宁沈阳110016 中国科学院大学北京100049

以Web of Science核心合集数据库(WOS)中收录的2958篇设施栽培碳研究文献和中国学术期刊全文数据库(CNKI)中收录的2036篇设施栽培碳研究文献为基础,利用知识图谱与文献计量学方法对1978~2022年开展的设施栽培碳相关科学研究进行综述。... 详细信息

以Web of Science核心合集数据库(WOS)中收录的2958篇设施栽培碳研究文献和中国学术期刊全文数据库(CNKI)中收录的2036篇设施栽培碳研究文献为基础,利用知识图谱与文献计量学方法对1978~2022年开展的设施栽培碳相关科学研究进行综述。结果表明,设施栽培碳研究经历了1978~1990年、1991~2002年、2003~2017年和2018年至今4个发展阶段,形成了以气体肥料与农艺效应、设施栽培土壤环境及其改良、设施栽培环境调控、设施栽培温室气体排放、设施栽培可持续发展5大研究领域,共14个主要研究方向。2002年以来,栽培管理措施对温室环境的影响研究和能源利用与设施栽培温室气体排放研究成为主要研究重点。未来设施栽培碳研究将以设施栽培碳排放特征、影响因素以及减少设施栽培温室气体排放为研究热点。

关键词：设施栽培文献计量共被引分析研究热点 CiteSpace

The Adsorbing Effect of Calcined Layered Double Hydroxide for Chloride Ions in Simulated Concrete Pore Solutions

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Journal of Wuhan University of Technology(Materials Science) 2014年第2期29卷 278-283页

作者：唐聿明 ZHAO Xuhui niu le 左禹 School of Materials Science and Engineering Beijing University of Chemical Technology Beijing Key Laboratory of Electrochemical Process and Technology for Materials

The adsorbing effect of calcined layered double hydroxide （CLDH） for chloride ions in simulated concrete pore （SCP） solutions was investigated with the potentiodynamic polarization method, impedance measurement, ion selective electrode analysis and XRD. CLDH could effectively adsorb Cl^- and increase pH value in SCP solutions containing NaCl. The chloride to hydroxyl ions ratio （[C1^-]/[OH^-]） of the solution greatly decreased by CLDH treatment. In CLDH treated SCP solution with CI-, the pitting potential of carbon steel notably increased, and the surface impedance was much higher, indicating strengthened passivation. The process of CLDH adsorbing chloride ions from SCP solutions was accompanied with the reconstruction of the layered structure.

关键词： pore solution corrosion adsorption chloride calcined layered double hydroxide

知识史与生活史——口述史研究的理论转向与实践策略

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民族文学研究 2022年第2期40卷 127-138页

作者：牛乐西北民族大学美术学院

当代口述史研究没有清晰的学科属性。口述史不能被视作历史书写的补充,而是具有能动性的知识生产形式,体现为动态的研究面向与实践策略。在口述史的意义世界中,知识史和生活史的叙事互构、互涉,表征了多元的生活世界本身,是对于生命情... 详细信息

当代口述史研究没有清晰的学科属性。口述史不能被视作历史书写的补充,而是具有能动性的知识生产形式,体现为动态的研究面向与实践策略。在口述史的意义世界中,知识史和生活史的叙事互构、互涉,表征了多元的生活世界本身,是对于生命情态伦理化、意义化的确证。

关键词：口述史口头传统知识史生活史非物质文化遗产