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Obtaining complex coagulants from waste OF metallurgical plants 从冶炼厂废渣中获得复合混凝剂
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3451
E. Kuzin, N. Kruchinina, J. Averina, A. Kurbatov, T. Nosova
{"title":"Obtaining complex coagulants from waste OF metallurgical plants","authors":"E. Kuzin, N. Kruchinina, J. Averina, A. Kurbatov, T. Nosova","doi":"10.37904/metal.2020.3451","DOIUrl":"https://doi.org/10.37904/metal.2020.3451","url":null,"abstract":"The processes of production of pig iron, steel and cast irons are accompanied by the formation of a significant amount of slag. This waste can be sent to re-smelting, however, if it contains a high content of impurity components, it is sent to the dump as waste. This waste contains 40 – 50 % of iron compounds, with a developed surface. In the framework of the work, it is proposed to use slag as a feedstock to obtain complex coagulants. Complex coagulants are highly effective reagents used in wastewater treatment processes for hydrotreating parts, gas purification, and also galvanic wastewater. As part of the studies, the high efficiency of complex coagulants in the processes of wastewater treatment of galvanic production from chromium (VI) ions was confirmed.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72652275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of internal cracks in high carbon casting bloom induced by soft reduction process and its improvement using numerical simulations and industrial experiments 采用数值模拟和工业试验相结合的方法分析了高碳铸件软还原工艺引起的内部裂纹及改进措施
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.1051/metal/2020079
N. Zong, Jian Huang, Jun Liu, Sida Ma, T. Jing
{"title":"Analysis of internal cracks in high carbon casting bloom induced by soft reduction process and its improvement using numerical simulations and industrial experiments","authors":"N. Zong, Jian Huang, Jun Liu, Sida Ma, T. Jing","doi":"10.1051/metal/2020079","DOIUrl":"https://doi.org/10.1051/metal/2020079","url":null,"abstract":"To comprehensively investigate and improve the internal cracks in high carbon casting bloom induced by the soft reduction process, a three-dimensional mechanical model was developed to calculate the cracking zone, centre solid fraction and the strain states in as-cast bloom. In the present work, the specific relationship between cracking zone area, centre solid fraction and maximum equivalent strain in cracking zone has been established under a number of withdrawal machines. A two-stage sequential soft reduction method was carried out for high carbon bearing steel, which aims to provide theoretical basis for improving the internal quality and effectively decrease the risk of internal cracks. According to the experimental results, the internal cracks were effectively alleviated and center shrinkage cavities were nearly eliminated by optimum designed experiments. Along the bloom central part, the proportion of length where the segregation rate is between 0.95 and 1 has been increased from 16.7% to 91%, and the fluctuation of carbon distribution in the center line of as-cast bloom was decreased to obtain the high homogeneity of the internal structure. In addition, grade of banded carbide in the hot-rolled wire decreased accordingly from 2.5 to 1.67.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84977460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Investigation on the control of multiphase flow behavior in a continuous casting tundish during ladle change 连铸中间包换包过程中多相流行为控制研究
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.1051/metal/2020070
X. Rui, L. Haitao, Hai-jun Wang, Li-zhong Chang, S. Qiu
{"title":"Investigation on the control of multiphase flow behavior in a continuous casting tundish during ladle change","authors":"X. Rui, L. Haitao, Hai-jun Wang, Li-zhong Chang, S. Qiu","doi":"10.1051/metal/2020070","DOIUrl":"https://doi.org/10.1051/metal/2020070","url":null,"abstract":"The transient multiphase flow behavior in a single-strand tundish during ladle change was studied using physical modeling. The water and silicon oil were employed to simulate the liquid steel and slag. The effect of the turbulence inhibitor on the slag entrainment and the steel exposure during ladle change were evaluated and discussed. The effect of the slag carry-over on the water-oil-air flow was also analyzed. For the original tundish, the top oil phase in the impact zone was continuously dragged into the tundish bath and opened during ladle change, forming an emulsification phenomenon. By decreasing the liquid velocities in the upper part of the impact zone, the turbulence inhibitor decreased considerably the amount of entrained slag and the steel exposure during ladle change, thereby eliminating the emulsification phenomenon. Furthermore, the use of the TI-2 effectively lowered the effect of the slag carry-over on the steel cleanliness by controlling the movement of slag droplets. The results from industrial trials indicated that the application of the TI-2 reduced considerably the number of linear inclusions caused by ladle change in hot-rolled strip coils.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85617891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Structure and magnetic properties of Nd-Fe-B alloys with Cu additions, obtained by mechanical synthesis 机械合成添加Cu的Nd-Fe-B合金的结构和磁性能
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3610
Kiril Panov, I. Shchetinin, I. Bordyuzhin, V. Menushenkov, I. Dorofievich
{"title":"Structure and magnetic properties of Nd-Fe-B alloys with Cu additions, obtained by mechanical synthesis","authors":"Kiril Panov, I. Shchetinin, I. Bordyuzhin, V. Menushenkov, I. Dorofievich","doi":"10.37904/metal.2020.3610","DOIUrl":"https://doi.org/10.37904/metal.2020.3610","url":null,"abstract":"In this work the phase transformations in Nd-Fe-B alloys with copper additives obtained by mechanochemical synthesis (MS) was studied. After MS process a partial decomposition of the Nd2Fe14B crystalline phase into the amorphous phase and α-Fe occurs with a maximum ratio of 20 and 8%, respectively. According to SEM data, the particle size was 1 μm with a substructure. The heat treatment of Nd-Fe-B alloys with Cu additives leads to crystallization of the amorphous phase and an increase in coercive force and residual magnetization. The maximum hysteresis properties were achieved for the sample with the addition of 0.4% Cu: Hc = 376 kA / m and σr = 65 A·m2/kg. It was shown that an increase in coercive force is associated with the presence of a mechanism for pinning of domain walls.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76681664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of External Stress on the POST-Aging MECHANICAL Properties of Rolled Magnesium Alloys 外应力对轧制镁合金时效后力学性能的影响
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3590
Mustafa Misirli, A. Hosseinzadeh, G. G. Yapici
{"title":"Effect of External Stress on the POST-Aging MECHANICAL Properties of Rolled Magnesium Alloys","authors":"Mustafa Misirli, A. Hosseinzadeh, G. G. Yapici","doi":"10.37904/metal.2020.3590","DOIUrl":"https://doi.org/10.37904/metal.2020.3590","url":null,"abstract":"In the current study the effects of conventional aging and stress aging on the microstructure and mechanical behavior of warm rolled AZ31 magnesium alloy were investigated. Tensile experiments revealed that the ultimate tensile strength (UTS) of the as-received AZ31 increased up to 300 MPa after 24 h aging at 120 °C, with a 2% reduction in ductility. Moreover, yield strength of the rolled and stress aged sample at 120 °C under an external stress of 50 MPa and only for 1 h was improved to 240 MPa. Microstructural observations demonstrate that the grain growth firstly reduced the strength of rolled condition while improving the strain at failure. This was followed by the nucleation of recrystallized grains, enhancing the UTS with acceptable ductility. In addition, fracture surface analysis of stress aged samples demonstrated nucleation-controlled fracture mechanisms with deeper void structures as a ductile characteristic.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80954776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimating the mechanical properties of friction welded AISI410 MSS joints using empirical relationship 用经验关系估计AISI410 MSS摩擦焊接接头的力学性能
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.1051/metal/2020075
M. Bakkiyaraj, G. Saikrishnan, V. Balasubramanian
{"title":"Estimating the mechanical properties of friction welded AISI410 MSS joints using empirical relationship","authors":"M. Bakkiyaraj, G. Saikrishnan, V. Balasubramanian","doi":"10.1051/metal/2020075","DOIUrl":"https://doi.org/10.1051/metal/2020075","url":null,"abstract":"The present study aims to develop the numerical relationship to attain maximum tensile strength of the friction welded AISI410 MSS joints by using response surface methodology. The friction welding (FW) process parameters considered for optimization namely rotational speed, upset pressure, friction time, and upset time. The FW parameters of 31 sets have been used to manufacture the joints to attain the maximum strength. Moreover, the detail relates the optimization procedure with respect to welding conditions on AISI410 MSS joints and its optimized parameters were reported. The optimized results have been correlated with the weld interface of the specimen with reference to tensile properties, macro and microstructure features, hardness, and fracture morphology. Finally, the results concluded that the rotational speed as the most effectual process parameter on the joint properties of the FW AISI410 MSS joint.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81134454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NANOSTRUCTURED Ti-22Nb-10Zr COATINGS 纳米Ti-22Nb-10Zr涂层的微观结构和力学性能
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3540
E. Frutos, M. Karlík, J. Jiménez, T. Polcar
{"title":"MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NANOSTRUCTURED Ti-22Nb-10Zr COATINGS","authors":"E. Frutos, M. Karlík, J. Jiménez, T. Polcar","doi":"10.37904/metal.2020.3540","DOIUrl":"https://doi.org/10.37904/metal.2020.3540","url":null,"abstract":"The design of implants and functional prostheses requires superficial modifications that promote fast and lasting osseointegration. Magnetron sputtering enables to design nanostructured and textured β-Ti rich Ti22Nb-10Zr (wt.%) coatings with variable mechanical properties (hardness and Young’s modulus). Depending on the magnitude of the bias voltage used during deposition of the coating, martensitic transformation from the unstable β (bcc) to α” (orthorhombic) phase is activated. This transformation induces compressive residual stresses modifying the tensile strength, hardness and Young's modulus. The residual stresses were measured by nanoindentation, the microstructure and phase evolution were characterized by X-ray diffraction. The spatial phase distribution was determined by transmission electron microscopy. The calculated real hardness increases from 2.1 to 4.1 GPa as the bias voltage is increased from 0 to -148 V. The calculus confirms that the coating has a non-linear elastic behavior.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83587962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Blast furnace gas as a product of pig iron production 高炉煤气作为生铁生产的一种产品
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3461
Jaroslav Melecký, L. Kovář
{"title":"Blast furnace gas as a product of pig iron production","authors":"Jaroslav Melecký, L. Kovář","doi":"10.37904/metal.2020.3461","DOIUrl":"https://doi.org/10.37904/metal.2020.3461","url":null,"abstract":"One of the products of pig iron production is blast furnace gas. Its pressure energy can be used, among other things, by including an expansion turbine with subsequent production of electricity. The contribution discusses the possibilities of calculating the thermodynamic quantities of blast furnace gas as a mixture of gases. The state equation of an ideal gas does not apply accurately enough over a wide range of temperatures and pressures. The inaccuracy of the ideal gas state equation generally increases with decreasing temperature and increasing pressure. To verify the dependence of gas thermodynamic quantities on pressure and to calculate state quantities under normal conditions, I present the so-called Benedict-Webb-Rubin equation, which can be easily derivable, so that from the pressure formula it is possible very easily to obtain formulas for other thermodynamic variables, is sufficiently precise and the values of constants are set for a large number of gases.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81403755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Properties of Al2O3 / ZrO2 composite for biomedical applications 生物医学用Al2O3 / ZrO2复合材料的性能
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.37904/metal.2020.3598
Z. Bałaga
{"title":"Properties of Al2O3 / ZrO2 composite for biomedical applications","authors":"Z. Bałaga","doi":"10.37904/metal.2020.3598","DOIUrl":"https://doi.org/10.37904/metal.2020.3598","url":null,"abstract":"The paper presents the results of testing a composite based on Al2O3 with the addition of zirconium oxide ZrO2 of 0 %, 5 %, 10 %, 15 %, and 20 %. ZrO2 powder was stabilized with 8% mol Y2O3. The composites were made by compaction of the mixed powders at 60 kN with subsequent sintering of the obtained moulded pieces at 1600 °C for five hours. The examinations of the composites included: determination of density and porosity, microscopic examination, X-ray diffraction (XRD), hardness measurements by the Vickers method, and determination of crack resistance. Microscopic examinations were carried out using scanning electron microscopy (SEM). A SEIFERT 3003 T-T X-ray diffractometer and radiation of a cobalt anode lamp were used to examine the phase composition.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87575907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Degradation behaviors of coke under complex solution loss conditions 复杂溶液损失条件下焦炭的降解行为
Revue De Metallurgie-cahiers D Informations Techniques Pub Date : 2020-01-01 DOI: 10.1051/metal/2020081
Jun Zhang, Dongsheng Yu, R. Guo, Jiaxiong Lin
{"title":"Degradation behaviors of coke under complex solution loss conditions","authors":"Jun Zhang, Dongsheng Yu, R. Guo, Jiaxiong Lin","doi":"10.1051/metal/2020081","DOIUrl":"https://doi.org/10.1051/metal/2020081","url":null,"abstract":"Solution loss reaction of coke provides reducing agent for ironmaking, which is an important chemical reaction in blast furnace. The coke itself is also degraded by the loss of carbon. In this paper, the degradation behavior of coke under complex conditions including alkali metal enrichment, simulated blast furnace temperature and atmosphere was studied. The pore size and pore wall thickness distribution of coke were measured by a microscope to characterize the structure of coke. The gasification reaction rate of coke matrix was measured by a thermogravimetric analyzer to characterize the matrix reactivity of coke. The results show that a coke has high CRI and low CSR, but it has high matrix reactivity and thick pore wall, which may lead higher strength after solution loss under alkali metal enrichment and simulated blast furnace atmosphere and heating conditions.","PeriodicalId":21337,"journal":{"name":"Revue De Metallurgie-cahiers D Informations Techniques","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88427956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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