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Effect mechanism of aluminum occurrence and content on the induration characteristics of iron ore pellets

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International Journal of Minerals,Metallurgy and Materials 2023年第12期30卷 2334-2346页

作者： Hongyu Tian deqing zhu Jian Pan Congcong Yang Weiqun Huang Mansheng Chu School of Metallurgy Northeastern UniversityShenyang 110819China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China Ecological Geology Brigade of Jiangxi Geological Bureau Nanchang 330030China Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking(Ministry of Education) Shenyang 110819China

With the intensified depletion of high-grade iron ores,the increased aluminum content in iron ore concentrates has become unavoidable,which is detrimental to the pelletization ***,the effect mechanism of aluminum on pellet quality must be *** this study,the influence of aluminum occurrence and content on the induration of hematite(H)and magnetite(M)pellets was investigated through the addition of corresponding Al-containing additives,including alumina,alumogoethite,gibbsite,and *** mineralogical analysis,combined with the thermodynamic properties of different aluminum occurrences and the quantitative characterization of consolidation behaviors,were conducted to determine the related *** results showed that the alumina from various aluminum occurrences adversely affected the induration characteristics of pellets,especially at an aluminum content of more than 2.0wt%.The thermal decomposition of gibbsite and kaolinite tends to generate internal stress and fine cracks,which hinder the respective microcrystalline bonding and recrystallization between *** adverse effect on the induration characteristics of fired pellets with different aluminum occurrences can be relieved to varying degrees through the formation of liquid phase bonds between the hematite *** is more beneficial to the induration process than the other three aluminum occurrences because of the formation of more liquid phase,which improves pellet *** research results can further provide insights into the effect of aluminum occurrence and content in iron ore concentrates on downstream processing and serve as a guide for the utilization of high-alumina iron ore concentrates in pelletization.

关键词： iron ore pellet aluminum occurrence consolidation behavior element migration

Colorimetric detection of glucose and an assay for acetylcholinesterase with amine-terminated polydiacetylene vesicles

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Chinese Science Bulletin 2011年第18期56卷 1877-1883页

作者： XUE WangXin ZHANG deqing ZHANG GuanXin zhu DaoBen Beijing National Laboratory for Molecular Sciences Organic Solids Laboratoo Institute of Chemistry Chinese Academy of Sciences Beijing100190 China

终止胺的 polydiacetylene (PDA ) 的比色的反应泡被改变答案的 pH 开始表明。检测葡萄糖和 acetylcholinesterase (疼痛) 活动的方便比色的方法被利用下列特征成功地用终止胺的 PDA 泡建立：(1 ) 终止胺的 PDA 泡作为答案变化的 pH 经... 详细信息

终止胺的 polydiacetylene (PDA ) 的比色的反应泡被改变答案的 pH 开始表明。检测葡萄糖和 acetylcholinesterase (疼痛) 活动的方便比色的方法被利用下列特征成功地用终止胺的 PDA 泡建立：(1 ) 终止胺的 PDA 泡作为答案变化的 pH 经历比色的转变；(2 ) 葡萄糖能面对葡萄糖 oxidase 被氧化到 gluconic 酸；并且(3 ) 疼痛催化醋胆素的水解作用到醋酸。葡萄糖层次和疼痛活动的视觉察觉显示出好选择和可接受的敏感。葡萄糖的察觉限制是 2.5 mol/L，疼痛活动的水平是象 10.0 mU/mL 一样低的 assayed。而且，终止胺的 PDA 泡能被用于屏蔽禁止者的活动对疼痛。

关键词：乙酰胆碱酯酶葡萄糖胺视觉检测比色法酶测定囊泡聚二乙炔 AChE活性

Integration of preparation of K,Na-embedded activated carbon and reduction of Zn-bearing dusts

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International Journal of Mining Science and Technology 2022年第3期32卷 627-636页

作者： Dingzheng Wang deqing zhu Jian Pan Zhengqi Guo Congcong Yang Hongyu Tian Yuxiao Xue School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

Large amounts of solid wastes and flue gases are generated in iron and steel production process,probably leading to serious environmental pollution without duly *** innovative and green process of simultaneous reduction of zinc-bearing dusts and activation of low-rank coal was developed and its mechanism was clarified in this *** the optimal conditions,the reduced zinc-bearing dusts containing low harmful elements(0.02%Zn,0.015%K and 0.03%Na)could be made as high-quality burden for blast furnace while the low-rank coal was transferred into K,Na-embedded activated carbon,which can be used as effective adsorbent for purification of SO_(2) and NO-containing flue *** solid wastes were successfully utilized to treat the flue gases through the *** synergetic activation and reduction mechanism in the process was *** coupling effect between reduction reactions of metal oxides in the dusts and activation reaction of carbon in the coal promoted the simultaneous reduction and activation *** the meanwhile,part of the potassium and sodium from the zinc-bearing dusts could be adsorbed by the activated carbon and played a catalytic role in the activation process.

关键词： Zinc-bearing dusts Reduction Activated carbon Activation mechanism Adsorption

Current situation of carbon emissions and countermeasures in China's ironmaking industry

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International Journal of Minerals,Metallurgy and Materials 2023年第9期30卷 1633-1650页

作者： Chenmei Tang Zhengqi Guo Jian Pan deqing zhu Siwei Li Congcong Yang Hongyu Tian School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

The iron and steel industry(ISI) involves high energy consumption and high pollution. ISI in China, a leading country in the ISI,consumed 15% of the country’s total energy and produced more than 50% of the global ISI’s carbon emissions. Therefore, in the context of global low-carbon economy and emission reduction requirements, low-carbon smelting technology in the ISI has attracted increasingly more attention in China. This review summarizes the current status of carbon emissions and energy consumption in China’s ISI and discusses the development status and prospects of low-carbon ironmaking technology. The main route to effectively reducing carbon emissions is to develop a gas-based direct reduction process and replace sintering with pelletizing, both of which focus on developing pelletizing technology. However,the challenge of pelletizing process development is to obtain high-quality iron concentrates. Consequently, the present paper also summarizes the development status of China’s mineral processing technology, including fine-grained mineral processing technology, magnetization roasting technology, and flotation collector application. This paper aims to provide a theoretical basis for the low-carbon development of China’s ISI in terms of a dressing–smelting combination.

关键词： iron and steel industry carbon dioxide emissions low-carbon technology beneficiation technology

^(40)Ar/^(39)Ar dating for Cenozoic kamafugite from western Qinling in Gansu Province

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Chinese Science Bulletin 2006年第13期51卷 1621-1627页

作者： YU Xuehui ZHAO Zhidan ZHOU Su MO Xuanxue zhu deqing WANG Yonglei State Key Laboratory of Geological Processes and Mineral Resources Key Laboratory of Lithosphere Technology of Ministry of Education China University of Geosciences Beijing 100083 China

40Ar/39Ar ages were determined for 6 phlogopite samples from a kamafugite pipe occurring in western Qinling, yielding a time span of 22 to 23 Ma for kamafugite eruption. Together with known geochronological data for the Qinghai-Tibet Plateau (QTP) and its peripheral regions, it is concluded that these Cenozoic potassic-ultrapotassic volcanic rocks are products of post-collisional volcanism. The age of the Cenozoic volcanic rocks in western Qinling partly overlaps that of potassic volcanics from the Gandise belt, reflecting the northward migration of the post-collisional volcanism in QTP. The age data not only confirm the temporal and spatial migration of post-collisional volcanism in QTP, but also provide geochronological constraints on the geodynamic set- ting at depth and the regimes of the tectonic evolution since Neogene in western Qinling regions.

关键词：同位素年代测定钾霞橄黄长岩西秦岭新生代甘肃

Enhancing the Sintering Performance of Blends Comprising High Ratio of Brazilian Hematite Concentrate by SMBGS Process

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Enhancing the Sintering Performance of Blends Comprising Hig...

应用双层指针缩短切换时延及优化路由的分布式移动性管理方案

第十届中国钢铁年会暨第六届宝钢学术年会

作者： zhu deqing Shi Benjing Pan Jian School of Minerals Processing and Bioengineering Central South University

Considering that only about 10%Brazilian hematite concentrate could be proportioned in the sinter blends because of its fine size in granulation,enhancing its sintering performance was studied by separated microballing granulating sintering(SMBGS)processes to further elevate its ratio up to 30%in the sinter *** with traditional granulation-sintering process,much better results were achieved by the SMSP as follows:elevating the unit productivity from 1.44 t·m·hto 1.71 t·m·h,augmenting the tumble index from 57.60%to 63.80%,decreasing the solid fuel rate from 76.46 kg·tto 65.24kg·t,Therefore,the SMBS process can significantly enhance the sintering performance of blends comprising high ratio of Brazilian hematite *** mechanism of the SMBS processes is demonstrated that the permeability of sinter mixture is increased markedly by separately microballing the fine hematite concentrate,and the coke level is cut appropriately,leading to a higher oxidation potential in sintering bed and more calcium ferrite bonding phase being formed *** the meantime,minerals in the product sinter crystalyse fully and compactly,and more middle or small sized round pores form compared to loose microstructure and irregular big pores in the traditional *** quality sinter with higher strength and better reducibility can be manufactured by the SMBS process.

关键词： brazilian hematite concentrate separated microballing-sintering process metallurgical performance

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浙江大学学报（理学版） 2017年第4期44卷 417-423页

作者：朱德庆潘根梅杭州师范大学现代教育技术中心浙江杭州310036 嘉兴学院数理与信息工程学院浙江嘉兴314001

根据锚点位置固定有否,移动IP协议分为锚点固定的移动性管理协议和分布式移动性管理协议两类,后者允许移动节点在会话开始时动态地选择较近的接入路由器作为锚点,从而可以缩短切换时延并实现近似最优的路由.然而,对于给定的会话,锚点的... 详细信息

根据锚点位置固定有否,移动IP协议分为锚点固定的移动性管理协议和分布式移动性管理协议两类,后者允许移动节点在会话开始时动态地选择较近的接入路由器作为锚点,从而可以缩短切换时延并实现近似最优的路由.然而,对于给定的会话,锚点的位置是固定的,在会话持续时间内进行移动节点切换时,切换操作与锚点固定的移动性管理协议相同,存在切换时延长和路由欠优问题.为解决该问题,提出了应用双层指针的分布式移动性管理方案.使用"低层指针"在具有移动性管理功能的接入路由器间建立指向关系以缩短切换时延;使用"高层指针"定期向锚点或对端节点注册优化路由并动态更换锚点;推导了所提方案和已有方案的切换时延公式.数值分析和仿真结果表明,所提方案可以缩短分布式移动性管理的切换时延.

关键词：移动性管理分布式锚点指针推进移动IP

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高压辊磨强化高镁磁铁矿球团工艺及机理

中南大学学报（自然科学版） 2016年第5期47卷 1465-1472页

作者：于鸿宾潘建朱德庆廖金能中南大学资源加工与生物工程学院湖南长沙410083

采用高压辊磨预处理技术对MgO以类质同象形式存在的高镁磁铁矿进行研究。研究结果表明:经过3次开路高压辊磨预处理,原料比表面积由669 cm^2/g提高到1 560 cm^2/g,膨润土用量由1.5%降低到0.7%。生球指标与未经高压辊磨预处理的相比均有... 详细信息

采用高压辊磨预处理技术对MgO以类质同象形式存在的高镁磁铁矿进行研究。研究结果表明:经过3次开路高压辊磨预处理,原料比表面积由669 cm^2/g提高到1 560 cm^2/g,膨润土用量由1.5%降低到0.7%。生球指标与未经高压辊磨预处理的相比均有大幅度提高,抗压强度达26.06 N,落下强度达10.5次,但是,生球爆裂温度降低至405℃,同时,焙烧球抗压强度由1 899 N提高到3 035 N。在高镁磁铁矿球团焙烧过程中,内部出现大量镁质浮士体,在晶格连接处产生骸晶,导致球团强度较低。高压辊磨预处理技术能促进高镁磁铁矿球团中Fe_2O_3晶体发育和再结晶,球团内部晶粒粗大,互联成片,逐渐将镁质浮士体包裹起来,克服含镁浮士体导致的结构缺陷,强化球团内部结构之间的连接,从而提高球团强度。

关键词：高镁磁铁矿高压辊磨预处理氧化球团抗压强度

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分流制粒强化巴西某镜铁矿的烧结性能

中南大学学报（自然科学版） 2014年第11期45卷 3719-3726页

作者：朱德庆郭正启潘建张峰中南大学资源加工与生物工程学院湖南长沙410083

对分流制粒强化镜铁矿烧结工艺及成品烧结矿冶化性能和矿相进行研究。研究结果表明:在焦粉用量4.2%(质量分数),混合料水分8.5%,分流制粒时间6 min,混合制粒时间3 min,精矿分流碱度1.64的条件下,烧结矿产量为1.71 t/(m2·h),转鼓强度为63... 详细信息

对分流制粒强化镜铁矿烧结工艺及成品烧结矿冶化性能和矿相进行研究。研究结果表明:在焦粉用量4.2%(质量分数),混合料水分8.5%,分流制粒时间6 min,混合制粒时间3 min,精矿分流碱度1.64的条件下,烧结矿产量为1.71 t/(m2·h),转鼓强度为63.80%,固体燃耗为65.24 kg/t。与常规烧结相比,产量提高18.8%,转鼓强度提高10.7%,而燃耗降低14.7%,显著地改善了烧结矿产质量。分流制粒工艺所得成品烧结矿还原度和还原粉化率分别为82.39%和70.15%,均能满足高炉冶炼需求。与常规烧结相比,镜铁矿分流制粒工艺烧结矿中形成更多的复合铁酸钙,其发育良好,并与磁铁矿、赤铁矿结晶互连;中孔厚壁结构增多,从而提高了烧结矿的强度。

关键词：镜铁矿分流制粒烧结工艺烧结性能