Removal of Vanadium from Molten Aluminum-Part I. Analysis of VB2 Formation

Khaliq, Abdul; Rhamdhani, M. Akbar; Brooks, Geoffrey; Grandfield, John

doi:10.1007/s11663-013-9974-x

Cited by 31 publications

(13 citation statements)

References 16 publications

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“…A dissolução das partículas é controlada pela transferência de massa através da interface sóli-do/líquido, devido ao maior ponto de fusão destas partículas em relação ao banho [13].…”

Section: Eds Da Partícula De Alb12unclassified

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Refino de grão de ligas alumínio- silício com ante-ligas Al-B

2016

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RESUMOCom o objetivo de conhecer a influência das partículas AlB 2 e AlB 12 na capacidade de refino de grão de uma liga Al-4B sobre ligas de fundição à base de alumínio-silício, realizou-se testes de refino TP1 da Aluminum Association variando-se as concentrações de AlB 2 e AlB 12 . Para a caracterização química foram utilizadas as técnicas de espectrometria de emissão óptica e espectrometria de energia dispersiva (EDS). O método utilizado para medir os tamanhos de grão foi o do intercepto, através de uma lupa estereoscópica. Os resultados foram comparados com os do refinador convencional Al-5Ti-1B. A liga alumínio-silício utilizada foi a Al11Si-0,1Mg, comum na produção de rodas automotivas. A liga Al-4B com 100% de partículas AlB 2 apresentou a melhor capacidade de refino, proporcionando tamanhos médios de grãos de 0,26 mm na liga Al-11Si-0,1Mg, no tempo de amostragem de 5 minutos. A liga Al-4B com 100% de partículas AlB 12 apresentou um resultado intermediário, com tamanhos médios de grãos de 0,43 mm na liga Al-11Si-0,1Mg, no tempo de 5 minutos. A liga Al-11Si-0,1Mg refinada usando-se o refinador convencional Al-5Ti-1B apresentou tamanho médio de grão de 0,63 mm após 5 minutos de amostragem, o pior resultado quando comparado com os refinadores Al-4B com 100% de partículas AlB 2 e AlB 12 respectivamente. Palavras-chave:Refino de grão, alumínio, boro. ABSTRACTIn order to investigate the influence of AlB 2 and AlB 12 particles on the grain refining performance of an Al-4B master alloy in aluminum-silicon casting alloys, Aluminum Association TP-1 grain size tests were performed for varying concentrations of AlB 2 and AlB 12 . For the chemical characterization, optical emission spectrometry and energy dispersive spectrometry (EDS) were used. Grain sizes were measured by line intercept method using stereoscopic microscope. The results were compared with the conventional grain refiner Al-5Ti-1B. The aluminum-silicon alloy used was the Al-11Si-0.1Mg, common in the production of automotive wheels. The master alloy Al-4B with 100% of AlB 2 particles showed the best refining performance, providing average grain sizes of 0.26 mm in the alloy Al-11Si-0.1Mg after sampling time of 5 minutes. The alloy Al-4B with 100% of AlB 12 particles showed an intermediate result, with average sizes of 0.43 mm in the alloy Al-11Si-0.1Mg after sampling time of 5 minutes. The alloy Al-11Si-0,1Mg refined using the conventional grain refiner Al-5Ti-1B presented average grain size of 0,63 mm after 5 minutes of sampling time, the worst result compared with the refiners Al-4B with 100% of AlB 2 and AlB 12 particles respectively.

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Section: Eds Da Partícula De Alb12unclassified

“…Resultados experimentais mostram que esta reação inicial é rápida e uma camada de diboretos é formada próximo à interface das partículas de AlB X ainda não dissolvidas [13].…”

Section: Eds Da Partícula De Alb12unclassified

Refino de grão de ligas alumínio- silício com ante-ligas Al-B

2016

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“…The sample preparation procedure was similar to that explained in Part I of this paper series. [25] Microscopy analysis was carried out at Swinburne University of Technology, Melbourne. A SUPRA model 40VP-25-38 fitted with an energy dispersive X-ray spectrum (EDX) detector was used for the observation and identification of different phases.…”

Section: Samples Characterizations and Chemical Analysismentioning

confidence: 99%

“…The observed trend of V concentration vs time, as shown in Figure 2, is similar to the results from the laboratory studies. [25,26] It is worth noticing that approximately 65 pct of V reacted during the first 100 minutes, i.e., the early stage of boron treatment process. The concentration of V dropped to 22 ppm as the furnace was filled with primary metal.…”

Section: A Kinetics Of V Removal From Smelter Grade Aluminummentioning

confidence: 99%

“…In Part I of this series of papers, a detailed analysis of VB 2 formation in molten aluminum has been presented through thermodynamic modeling and experimental studies. [25] Part II describes the kinetics analysis and the mechanism of VB 2 boride formation in molten aluminum. [26] In Part III (this paper), a critical analysis of industrial boron treatment was carried out.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Vanadium from Molten Aluminum—Part III. Analysis of Industrial Boron Treatment Practice

Khaliq

Rhamdhani

Brooks

et al. 2014

Metall Mater Trans B

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Transition metal impurities (V, Ti, Zr, and Cr) reduce the electrical conductivity of smelter grade aluminum. These impurities are removed in the form of their borides by reacting with added Al-B master alloys i.e., boron treatment. Although, boron treatment is widely used for the production of high purity aluminum alloys in casthouse the fundamental understanding is lacking and published industrial data are limited. In the current study, industrial trials on the removal of impurities were conducted at one of the high purity aluminum alloys producers in Australasia. Kinetics analysis revealed that the rate of reaction is controlled by the mass transfer of impurities in the bulk melt. The measured mass transfer coefficient (k m) of V and Ti were 1.1 9 10 À4 and 2.6 9 10 À4 m/s respectively, in the naturally stirred molten aluminum. The rate of V and Ti removal was faster compared to Zr and Cr during the boron treatment of smelter grade aluminum. Mass balance analysis revealed that 70 wt pct of V and Ti combined as borides in the first hour of the total 12 hours of boron treatment process. The calculated amount of un-reacted B was approximately 25.5 wt pct of initial amount added that remained in the final alloy. There was no evidence of boride rings formation, although partially dissolved AlB 12 particles were observed under scanning electron microscope. Finally, implications for industrial practice are discussed for the improvement of current boron treatment process that include changing the source of boron, multiple stage addition of boron and better stirring of the molten aluminum.

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Analysis of Boron Treatment for V Removal Using AlB₂and AlB₁₂Based Master Alloys

Khaliq¹,

Rhamdhani²,

Brooks³

et al. 2014

Light Metals 2014

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Removal of Vanadium from Molten Aluminum-Part I. Analysis of VB2 Formation

Cited by 31 publications

References 16 publications

Refino de grão de ligas alumínio- silício com ante-ligas Al-B

Refino de grão de ligas alumínio- silício com ante-ligas Al-B

Removal of Vanadium from Molten Aluminum—Part III. Analysis of Industrial Boron Treatment Practice

Analysis of Boron Treatment for V Removal Using AlB₂and AlB₁₂Based Master Alloys

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Removal of Vanadium from Molten Aluminum-Part I. Analysis of VB2 Formation

Cited by 31 publications

References 16 publications

Refino de grão de ligas alumínio- silício com ante-ligas Al-B

Refino de grão de ligas alumínio- silício com ante-ligas Al-B

Removal of Vanadium from Molten Aluminum—Part III. Analysis of Industrial Boron Treatment Practice

Analysis of Boron Treatment for V Removal Using AlB2and AlB12Based Master Alloys

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Analysis of Boron Treatment for V Removal Using AlB₂and AlB₁₂Based Master Alloys