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2003-2017 冶金工程技术
为您找到包含“”的内容共295

尹刚,李胜利,孟凡童,刘海啸,王国承,艾新港

2014-10-30

钢锭的冷却过程中会出现疏松,缩孔和偏析等缺陷。本文提出在钢锭模上加散热片来加快钢锭的冷却,分析加不同形状的散热片后钢锭凝固过程中的温度场变化、全凝时间、缩孔情况等传热行为。研究表明:加散热片后钢锭凝固时间缩短了60s,而且水平布置的散热片与竖直布置的散热片相比凝固速率加快了16%,本体全凝时间加散热片比不加散热片增加了45%,加水平散热片比竖直散热片增加了25%。

教育部2011年度高等学校博士学科点专项科研基金项目(20112120l20003

辽宁省教育厅项目(L2012090

辽宁科技大学大学生创新创业训练计划项目(101462013080

辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051

#冶金工程技术#

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孟凡童,艾新港,李胜利,尹刚,刘海啸,王国承

2014-10-31

本文依据相似原理,以鞍钢第三炼钢厂钢包和RH真空设备为原型,建立与原型尺寸比为1:4的物理模型,用NaOH代替钢液进行模拟吹气及脱气行为。通过对不同提气量和真空度条件下的对比试验,可以得出:吹气过程,真空度为3575pa时PH下降比真空度为3238pa时快10.11%,提气量为3.0时PH下降比提气量为5.2时少30%.脱气过程,时间为前20min,提气量为5.2时,CO2浓度下降最快达0.02007,比提气量为3.0时快20%,真空度为3625Pa时CO2浓度下降比真空度为3288Pa时快6%。

教育部2011年度高等学校博士学科点专项科研基金项目(20112120l20003

辽宁科技大学大学生创新创业训练计划项目(201310146019

辽宁省教育厅项目(L2012090

辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051,辽宁科技大学材料与冶金学院,鞍山 114051

#冶金工程技术#

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LI Xingbin,WEI Chang,DENG Zhigan,LI Minting,LI Cunxiong,FAN Gang

Solvent extractionof vanadium(IV) from sulfuric acid solution has been studied using 2-ethyhexyl phosphonic acid mono 2-ethylhexyl ester (P507) dissolved in kerosene. The different affecting parameters of equilibrium pH, extractant concentration, temperature and extraction isotherm were separately investigated. The extraction of vanadium(IV) from a synthetic sulfuric acid leach solution of stone coal was also examined. The equilibrium study indicated the release of two moles of H+ ions for extraction of one mole of vanadium(IV) and association of two moles of the mono extractant in the extracted species. The extracted complex VOA2 was calculated from slope analysis and confirmed by IR spectra. A positive value of ΔH obtained from temperature variation studies show that the extraction process is endothermic reaction. A continuous counter current simulation extractionand stripping confirmed 96.1% extraction and 99.6% stripping, further attributes to the enrichment 5 times of vanadium(IV) concentration in the strip solution.

2014-11-04

Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20115314110001

National Basic Research Program of China (Grant No. 2014CB643404

NSFC (Natural Science Foundation of China

Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093

#Metallurgical Engineering#

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LI Xingbin,WEI Chang,LI Cunxiong,DENG Zhigan,LI Minting,FAN Gang

Di (2-ethylhexyl) phosphoric acid (P204) and tri-n-butyl phosphate (TBP) were used to extraction vanadium from a H2SO4-HF mixed acids leaching solution of stone coal in this paper. Effect of different operational factors such as equilibrium pH, extractant concentration, extraction stage, strip solution concentration, phase ratio were examined to optimize the condition for selective and quantitative extraction and stripping of vanadium. Based on the results of extraction as well as stripping isotherm, the extraction of vanadium was quantitative in six stages using 10% P204 and 5% TBP at A:O ratio of 1:1 and equilibrium pH of 2.4; 99.6% percentage stripping of vanadium from the loaded organic phase was obtained by five stage stripping using 1.5 mol/L H2SO4 at A:O ratio of 1:8. In the solvent extraction process, scrubbing is necessary for removing co-extracted and entrainment impurities by dilute sulfuric acid solution, more than 90% iron and arsenic can be scrubbed by 0.2 mol/L sulfuric acid.

2014-11-07

Research Fund for the Doctoral Program of Higher Education of China ( No. 20115314110001

NSFC (Natural Science Foundation of China

National Basic Research Program of China ( Nos. 51474115 and 51304093)

Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093,Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093

#Metallurgical Engineering#

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石露露,何飞

2014-12-11

为了提高热轧生产过程精轧机组的轧制力预设定精度,需要对轧制力进行高精度的预报。本文通过理论公式计算出轧制力的近似值,然后利用基于聚类方法的反向传播神经网络计算出轧制力的修正系数,通过二者结合来预报出高精度的轧制力值。结果表明,轧制力预报的平均相对误差为3.2%,满足了现场的生产要求。

国家自然科学基金资助项目( 51204018

高等学校博士学科点专项科研基金资助项目(20110006110027

北京科技大学机械工程学院国家板带生产先进装备工程技术研究中心,北京科技大学机械工程学院国家板带生产先进装备工程技术研究中心

#冶金工程技术#

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WANG Jun,ZHAO Hongbo,TAO Lang,CAO Pan,QIN Wenqing,QIU Guanzhou

Electrochemical measurement, X-ray diffraction analysis (XRD) and X-ray photoelectron experiment (XPS) analysis were carried out to investigate the surface species and interfacial reactions during bioleaching of chalcopyrite by different strains of moderately thermophilic bacteria. Results showed that CuS and disulfide (S22-) were the main intermediate species on the surface of chalcopyrite during bioleaching by A. caldus, S. thermosulfidooxidans and L. ferriphilum. The low kinetics of dissolution of chalcopyrite in A. caldus can be mainly due to the incomplete dissolution of chalcopyrite and the passivation layer of polysulfide. Polysulfide and jarosite can be mainly responsible for the passivation of chalcopyrite in bioleaching by L. ferriphilum or by S. thermosulfidooxidans.

2015-01-16

China Postdoctoral Science Foundation (project No. 2014T70692)

Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China,School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China,Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China,School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China,Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China,School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China

#Metallurgical Engineering#

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WANG Jun,ZHAO Hongbo,TAO Lang,CAO Pan,QIN Wenqing,QIU Guanzhou

Chalcopyrite and marmatite are associated together most of the time in the raw ores and flotation concentrates. In this work, the interactions between chalcopyrite and marmatite during bioleaching by moderately thermophilic bacteria were investigated mainly by electrochemical measurements and bioleaching experiments. In the initial stage of bioleaching of mixture of chalcopyrite and marmatite, the dissolution of marmatite was preferential, and was significantly accelerated with the addition of chalcopyrite because of the galvanic effect and catalytic effect of Cu2+ ions, while the dissolution of chalcopyrite was inhibited mainly due to the galvanic effect before the accomplishment of dissolution of marmatite. Chalcopyrite dissolved fast when the dissolution of marmatite finished, and small amount of marmatite cannot inhibit the final copper extraction of chalcopyrite if leaching time was long enough. Therefore, stepwise or selective bioleaching was feasible in processing mixture of chalcopyrite and marmatite to avoid complex flotation process in separating chalcopyrite and marmatite. )

2015-01-14

China Postdoctoral Science Foundation (project No. 2014T70692)

School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China,Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China,School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China,Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China,School of Minerals Processing & Bioengineering, Central South University, Changsha 410083, Hunan, PR China,Key Lab of Biohydrometallurgy of Ministry of Education, Changsha 410083, Hunan, PR China

#Metallurgical Engineering#

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王彪,陈士富

2015-03-16

本文主要对球团矿的低温粉化性能进行实验研究。通过KSZ-03矿石冶金性能综合测定仪和转鼓等设备对球团矿的低温还原粉化性进行性能检测,确定其低温还原粉化性及粉化程度的影响因素。结果表明,当气体条件保持不变,提高低温粉化实验的还原气体流量,球团矿还原粉化程度明显提高;当还原温度达到500 ℃,球团矿低温粉化现象最严重,低温粉化度最高,在此基础上温度的升高和降低都会降低粉化程度。

河北省教育厅自然科学研究指导项目(Z2010217

东北大学秦皇岛分校资源与材料学院,秦皇岛 066004,东北大学秦皇岛分校资源与材料学院,秦皇岛 066004

#冶金工程技术#

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肖宏,谢红飙,解芃芃,张少坤,任忠凯

2015-03-20

金属铁产品从铁水到成品需要经过一系列加工,而在加工过程中不可避免会产生许多废铁屑。由于金属铁的广泛应用且铁屑的回收并没有十分高效的方法,因此回收铁屑是个值得研究的课题。本文介绍了一个固态回收铁屑的新方法,不需要经过熔化,排污少,工序少。使用本文方法可直接利用铁屑通过冷压-热轧生产不锈钢/铁屑复合板,通过金相观察,剪切实验,弯曲测试对复合板性能进行了检验。实验结果显示两金属界面结合紧密,没有不良空洞及缝隙,剪切强度超过国家标准规定值,弯曲结果显示两金属在大变形情况下结合紧密,表现出良好的塑性。本文方法较传统铁屑回收方法具有低能耗,产生新铁屑少的特点。

高等学校博士学科点专项科研基金(20121333110003

燕山大学国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004,燕山大学国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004,燕山大学国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004,燕山大学国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004,燕山大学国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004

#冶金工程技术#

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王耐,王耐

2015-04-03

本文综述了钒渣提钒焙烧工艺过程中起着要作用的两个含钒氧化物体系:Na2O-V2O5和CaO-V2O5体系的相图和热力学数据。并对不同作者测定的相图数据进行了对比分析,对今后的工作方向进行了讨论。

北京科技大学冶金与生态工程学院,北京 100083,北京科技大学冶金与生态工程学院,北京 100083

#冶金工程技术#

本文收录在中国科技论文在线精品论文,2016,9(2):101-111.

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