Management of Impurities in Cast House with Particular Reference to Ni and V

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

doi:10.1002/9781118663189.ch6

Cited by 5 publications

(2 citation statements)

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“…The removal of non-reactive impurities in aluminum such as Fe and Ni are of a great challenge to researchers. [22,23,32,33] The removal of high concentration of Fe from molten aluminum using borates was investigated by Gao et al [14] It was reported that the minimum level of Fe that could be achieved using borate additives in molten aluminum is 11.9 wt pct. This level of Fe concentration is much higher than the particular situation under investigation (ppm level).…”

Section: The Kinetics Of Ti Zr Cr and Fe Removal From Aluminummentioning

confidence: 99%

“…[19][20][21] Various researchers have also reported the increase of V in petroleum coke and its impact on the final properties of aluminum. [19,[22][23][24] Many aluminum smelters are facing challenges due to the rise of impurities especially V in the petroleum coke. [4,5,21] Keeping in view the increase of V and its high proportion in the smelter grade aluminum, the impurities analysis then the optimization of boron treatment is important to maintain the quality of electrical grade aluminum alloys.…”

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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Section: The Kinetics Of Ti Zr Cr and Fe Removal From Aluminummentioning

confidence: 99%