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1. Coupled numerical simulation on Fluid Flow, Heat Transfer and Solidification in Bloom Continuous Casting Mold | |||
WEN Yanmei,LIU Shaowei,HAN Yanshen,LI Youhuai,LIU Qing,GUAN Min | |||
Metallurgical Engineering 10 November 2017 | |||
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Abstract:Taking bloom mold with cross-sectional dimension 240mm×240mm as research object,a three-dimensional mathematical model was established to research effects of the submergence depth of the submerged entry nozzle (SEN) and casting speed on flow field and solidification taking effect of air-gap into account. The simulation result shows that the impact depth in mold with one port SEN is deep which is good for uniform growth of solidified shell. Meanwhile, the air gap has evident effect on corner temperature which is more practical than ignoring air gap. In addition, the distance between backflow vortex core and free surface increases and backflow vortex core moves up obviously, with the increasing of SEN-depth. Solidified shell thickness decreases from 32.43 mm to 17.83 mm with the casting velocity from 0.5 m/min to 0.9 m/min. In conclusion, according to the comparative analysis, the optimal combinations of process parameters are the depth of SEN of 100mm and the casting speed of 0.7 m/min in order to ensure the production efficiency and the bloom quality for the 42CrMo steel with cross-sectional dimension 240 mm×240 mm. | |||
TO cite this article:WEN Yanmei,LIU Shaowei,HAN Yanshen, et al. Coupled numerical simulation on Fluid Flow, Heat Transfer and Solidification in Bloom Continuous Casting Mold[OL].[10 November 2017] http://en.paper.edu.cn/en_releasepaper/content/4741984 |
2. Study on volatility of manganese metal in reduction process of manganese ore self-reduction pellets at high temperature | |||
XUE Zheng-liang,ZHANG Bo,YU Yue,DONG Jiang | |||
Metallurgical Engineering 25 January 2014 | |||
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Abstract:In order to study the thermodynamic and kinetics of Mn volatilization in the reduction process, the self-reduction experiment of carbon-mixed manganese ore pellets was performed in carbon tube furnace at high temperature. The results show that the Mn equilibrium vapor pressure becomes higher and the Mn volatile quantity is increasing with the temperature increasing. A model, controlled by both the interface chemistry reaction and diffusion in solid products layer is established. The apparent activation energy of chemical reaction is 192.8kJ/moland the apparent activation energy of internal diffusion is 21.94kJ/mol, so the volatility of Mn is controlled by the chemical reaction rate. | |||
TO cite this article:XUE Zheng-liang,ZHANG Bo,YU Yue, et al. Study on volatility of manganese metal in reduction process of manganese ore self-reduction pellets at high temperature[OL].[25 January 2014] http://en.paper.edu.cn/en_releasepaper/content/4583707 |
3. Study on relationships between cooling conditions and structure changes of molten slag | |||
Li Yu,Liu Xiaoming,Cang Daqing | |||
Metallurgical Engineering 15 July 2013 | |||
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Abstract: Properties of slag have an important effect on its cooling process and subsequent utilization of slag and are affected by the changes of structure in slag. In the paper, blast furnace slag(BFS)re-melted respectively at 1350℃, 1450℃ and 1550℃ were water-quenched to prepare samples, along with an air-quenched sample re-melted at 1450℃ as reference. The samples were investigated by using XRD, DTA and NMR. The results show that two transformation types of aluminosilicates structure exist in the melts under different cooling condition. A high temperature transformation (HTT) would occur when melts cooled under very slow or very fast cooling speed and would respectively leaded the melts to precipitate melilite crystals or freeze into homogeneous glass phase. The other is a low temperature transformation (LTT), which would happen when a sub-stable phase-separated structure came into being in the melts cooled under a relative slow or fast cooling speed. And it would respectively lead the melts precipitate mervinite crystals or freeze into phase-separated glass phase. The sub-stable phase-separated structure is a coexistence structure of high polymeric Q4(2Al) or melilite units (Si-rich phase) with low polymeric Q0 units (Ca-rich phase). Mg2+ would change its coordination from 4 to 6 during LTT, which increases the amounts of Q0 units and is contributed to the formation of the phase-separated structure. | |||
TO cite this article:Li Yu,Liu Xiaoming,Cang Daqing. Study on relationships between cooling conditions and structure changes of molten slag[OL].[15 July 2013] http://en.paper.edu.cn/en_releasepaper/content/4551309 |
4. Cold Model Experiments on Inclusion Removal by Ultrasonic Horn | |||
SHEN Minggang,KANG Shumei,LI Chengwei,JIN Hui | |||
Metallurgical Engineering 31 October 2012 | |||
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Abstract:The effect of power and tool rod position on inclusion removal was studied in the ladle refining cold model when the organic particles were used to imitate the inclusion. The results show that as the power increase, cavitation intensity increases, the number of cavitation bubbles increases, the collision probability of the cavitation bubbles increases with the inclusion, the efficiency of removing inclusion increases; as the wave source into the liquid is 1/2 H, the effect of removing inclusion is the best;the inclusion removal rate when the radiator is in the centre of the ladle model is higher than on the edge at the same height. | |||
TO cite this article:SHEN Minggang,KANG Shumei,LI Chengwei, et al. Cold Model Experiments on Inclusion Removal by Ultrasonic Horn[OL].[31 October 2012] http://en.paper.edu.cn/en_releasepaper/content/4493472 |
5. Influence of Contents of Carbon and Phosphorous on the Crumbling Phenomena of Si-Al-Fe | |||
Zhang Jun | |||
Metallurgical Engineering 31 December 2011 | |||
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Abstract:SiAlFe ferroalloy is widely used as a strong de-oxidation compound to substitute pure aluminum in the production of iron and steel. However, its wide application is limited by the frequent occurrence of self-crumbling phenomena and accompanied emissions of a small amount of toxic and explosive gases. This paper determined the corresponding affecting factors by primary investigation of SiAlFe ferroalloy. Then the influence of contents of carbon and phosphorous on the self-crumbling was studied. The results showed that samples containing more phosphorous crumbled more seriously and the content of phosphorous was suggested to be less than 0.03 wt %. The change of content of carbon did not affect the crumbling obviously, ranging from 0.1~0.7 wt %. | |||
TO cite this article:Zhang Jun. Influence of Contents of Carbon and Phosphorous on the Crumbling Phenomena of Si-Al-Fe[OL].[31 December 2011] http://en.paper.edu.cn/en_releasepaper/content/4458888 |
6. Comprehensive Utilization of Metallurgical Dusts & Sludge with New Type Composite Binder (CB) | |||
Zhang Yuan-bo,Han Gui-hong | |||
Metallurgical Engineering 01 June 2009 | |||
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Abstract:Having poor hydrophilicity, metallurgical dusts & sludge are difficult to recycle. Aiming at producing metallic briquettes for iron-making, investigations on agglomeration of metallurgical dusts & sludge with CB and its reduction roasting are studied. CB consists of organic polymer, which can improve hydrophilicity of dusts & sludge. FT-IR spectrum indicates that composite binder contains a variety of active groups (-OH,-COOH). Using the wet-grinding process, CB dosage can be decreased to 1.4%. Composite binder has the role of catalytic reduction at high temperature. Compared bentonite with the composite binder, the TFe and metallization ratio of products are increased by 2-3%. Under the conditions of roasting temperature 1275℃, and time 20 min, roasted briquettes with TFe of 64.74% and metallization ratio of 85.66% could be obtained. The residual Zn and Pb content meet the demands of iron-making. | |||
TO cite this article:Zhang Yuan-bo,Han Gui-hong. Comprehensive Utilization of Metallurgical Dusts & Sludge with New Type Composite Binder (CB)[J]. |
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