Effects of Na2B4O7 on the elimination of iron from aluminum melt

Gao, Jianwei; Shu, Da; Wang, J.; Sun, Baode

doi:10.1016/j.scriptamat.2007.04.009

Cited by 36 publications

(25 citation statements)

References 8 publications

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“…The results showed that the reinforcing phases in the system Al-K 2 ZrF 6 -Na 2 B 4 O 7 were Al 2 O 3 and ZrB 2 . The possible reaction occurring in the Al-K 2 ZrF 6 -Na 2 B 4 O 7 system can be illustrated as follows [16][17][18] : ( ) ( )…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Microstructures and properties of in-situ (ZrB₂ + Al₂O₃)_np/AA6111 composites synthesized under magnetic and ultrasonic fields

Xia¹,

Zhao²,

Chen³

et al. 2020

Mater. Res. Express

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ZrB 2 and Al 2 O 3 nanoparticle-reinforced aluminum matrix composites were successfully prepared by in situ chemical reaction of the Al-Na 2 B 4 O 7 -K 2 ZrF 6 system with magnetic field applied in the in situ reaction and ultrasonic field introduced in solidification. The results indicated that the optimized magnetic frequency was 10 Hz, and the ultrasonic power was 1.0 kW. XRD analysis showed that ZrB 2 and Al 2 O 3 nanoparticles have been obtained. The smaller clusters were evenly distributed in the matrix. ZrB 2 and Al 2 O 3 nanoparticles were dispersed and uniformly distributed. The average size of particles and grain size of (ZrB 2 +Al 2 O 3 ) np /AA6111 composites were refined to 45±10 nm and 50.4±12 μm, respectively. The maximum Vickers hardness, tensile strength, yield strength and elongation of the composites synthesized under the optimized magnetic and ultrasonic fields were 142.2 HV, 355.4 MPa, 259.4 MPa and 22.4%, which were 1.34, 1.36, 1.35 and 1.33 times higher than that of AA6111 alloy, respectively.

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Section: Microstructural Characterizationmentioning

confidence: 99%

Microstructures and properties of in-situ (ZrB₂ + Al₂O₃)_np/AA6111 composites synthesized under magnetic and ultrasonic fields

Xia¹,

Zhao²,

Chen³

et al. 2020

Mater. Res. Express

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show abstract

“…Industrially, impurities such as V, Ti, Zr, and Cr are removed in casthouse by the addition of boron bearing substances to the molten aluminum, known as boron treatment. [6][7][8][9][10][11][12][13][14][15][16] In the boron treatment of molten aluminum, Al-B master alloys are added in the form of waffles, ingots, or rods, depending on the process requirement and the required quality of the end product. Al-B master alloys containing AlB 2 or AlB 12 phases are commonly used in the industry.…”

Section: Introductionmentioning

confidence: 99%

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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“…[3][4][5] Among the iron removal methods employed, the most popular strategy adopts the precipitation and separation of Fe-rich phases from the liquid Al melt, [6][7][8] and also requires the addition of other elements, such as Mn, Cr, etc. [9][10][11][12] However, many additives are harmful to the Al alloys. Zone refining, 13) which is based on the theory of unidirectional solidification, is also an effective method to remove impurities from metal, but it is adapted to the high-purity aluminum, not to the large-scale product.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method to Remove Iron Impurity from Aluminum

et al. 2011

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A novel method for iron removal from aluminum by electroslag refining using KCl-NaCl-Na 3 AlF 6 flux containing P was studied. After electroslag refining, the Fe content in commercial purity aluminum decreased from 0.48% to 0.30 mass%, and the mechanical properties of commercial purity aluminum were improved, especially in tensile elongation increased by 33%. XRD and TEM analysis of the sludge indicated that the reaction between the melt and the molten slag to form Fe 2 P in the electroslag refining process was the main reason for iron reduction. The thermodynamic phase diagram calculation for Al-Fe-P system accounts for the formation of Fe 2 P theoretically in the electroslag refining process.

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Effects of Na2B4O7 on the elimination of iron from aluminum melt

Cited by 36 publications

References 8 publications

Microstructures and properties of in-situ (ZrB₂ + Al₂O₃)_np/AA6111 composites synthesized under magnetic and ultrasonic fields

Microstructures and properties of in-situ (ZrB₂ + Al₂O₃)_np/AA6111 composites synthesized under magnetic and ultrasonic fields

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

A Novel Method to Remove Iron Impurity from Aluminum

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Effects of Na2B4O7 on the elimination of iron from aluminum melt

Cited by 36 publications

References 8 publications

Microstructures and properties of in-situ (ZrB2 + Al2O3)np/AA6111 composites synthesized under magnetic and ultrasonic fields

Microstructures and properties of in-situ (ZrB2 + Al2O3)np/AA6111 composites synthesized under magnetic and ultrasonic fields

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

A Novel Method to Remove Iron Impurity from Aluminum

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Product

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Microstructures and properties of in-situ (ZrB₂ + Al₂O₃)_np/AA6111 composites synthesized under magnetic and ultrasonic fields

Microstructures and properties of in-situ (ZrB₂ + Al₂O₃)_np/AA6111 composites synthesized under magnetic and ultrasonic fields