Mechanism to remove oxide inclusions from molten aluminum by solid fluxes refining method

Liu, Cong; Li, Jianguo; Mao, Yi-zhe; Ji, Jia-cheng

doi:10.1007/s41230-017-7005-2

Cited by 20 publications

(16 citation statements)

References 13 publications

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“…According to the type, wettability, and density of the mentioned inclusions, they can either float or agglomerate inside the melt. For instance, oxides and inclusions with low wettability relative to Al melt are prone to agglomerate, while some inclusions like Al 2 O 3 adsorb gas bubbles and float on the melt surface [10]. Without the sophisticated melt refining and purification process, these oxide inclusions will be retained in the aluminum melt, inducing many troubles and leading to the deterioration of mechanical properties, machinability, and surface quality [11].…”

Section: Introductionmentioning

confidence: 99%

Melt refining and purification processes in Al alloys: a comprehensive study

Wu¹,

Djavanroodi²,

Göde³

et al. 2022

Mater. Res. Express

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Aluminum and its alloys having lots of advantageous properties are among the most-used metallic materials. So, it is of immense importance to find suitable processes and methods leading to high-quality purified Al melt. In this regard, there are numerous challenges in achieving high purity Al melts, such as its propensity to react with air, oxygen, and water vapor, the presence of a variety of oxide, non-oxide, and solid particle inclusions that lead to the production of pores, cracks, pinholes, and dross, finally adversely influencing the overall quality of the product. The main methods of melt refining are fluxing, floatation, and filtration, but more sophisticated methods have also emerged. The best method for purification can be chosen based on the type of impurities and the desired level of purification. With the industrial development, the need to establish more cost-effective and simpler methods has increased, and in addition, methods should be considered for recycling large volumes of scarp Al parts that contain more impurities. Moreover, achieving high purity melt is also a vital issue for use in specific applications. The present article has been written to discuss the above issues and focus on the study of various methods of aluminum purification.

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Section: Introductionmentioning

confidence: 99%

Melt refining and purification processes in Al alloys: a comprehensive study

Wu¹,

Djavanroodi²,

Göde³

et al. 2022

Mater. Res. Express

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“…However, the adhesion behavior between an inert carrier and an adsorbent occurs at high temperatures and results in the loss of reactive sites gradually with chemical reaction processing. Consequently, the efficiency of CaL is suppressed. , …”

Section: Introductionmentioning

confidence: 99%

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

et al. 2021

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The influence of the vacancy defect of the CaO surface on the wettability of molten alkali metal salt was studied by molecular dynamics simulations. The results indicated that in the temperature range of 800–1100 K, the molten Na2SO4 on both VDcalcium and VDoxygen defect surfaces presented a poor wettability compared to that on the complete surface. Measurement of the density profile and the contact angle of the molten Na2SO4 showed that the higher the temperature and defect concentration, the worse the wettability. The micromechanism was revealed by calculating the polarization intensity that the vacancy defect surface led to the formation of the induced dipole moment in the molten Na2SO4. Induced polarization caused by defect surfaces reduces the wettability of Na2SO4. More importantly, as the temperature and defect concentration increase, various defect surfaces form loose and local weak liquidity structures. These structures are beneficial for the diffusion of carbon dioxide into the solid, but the reduction in the spreading area caused by poor wettability causes the efficiency of the CaL to decline. The vibration difference between Na2SO4 and CaO increases with the increased temperature and defect concentration. This means that the thermal energy transportability at the interface is suppressed by poor wettability.

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“…At present, NaCl, NaF and Na 3 AlF 6 are among the most widely used sodium salts in the production of fluxes. NaCl is the basic component of the NaCl-KCl system fluxes, while NaF and Na 3 AlF 6 are considered to be effective components for the removal of nonmetallic oxide inclusions [7,8], and they are widely used in the smelting of recycled aluminum. In order to further clarify the principle of composition design of flux for Al-Mg alloy, it is necessary to study the influence of different sodium-containing fluxes on the residual sodium content of aluminum alloys with high magnesium content.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium-Containing Fluxes on the Residual Sodium Content and Distribution in Al–Mg Alloys

Huang

Liu

Huang

et al. 2021

Metals

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To get an insight into the residual sodium content of Al–Mg alloys, three types of sodium-containing fluxes were introduced into the melt with different magnesium content. The increment, existing form and distribution of sodium in Al–Mg alloys with different magnesium content were analyzed. The results show that the influence of different sodium salts on the increment of sodium in Al–10Mg alloy is significantly different. The NaF raised the sodium level in Al–10Mg alloy to the highest extent, Na3AlF6 coming second, and NaCl did not have an obvious influence. The magnesium element in the aluminum melt was found to be the key factor leading to the increment of sodium level. After the salt fluxing treatment of aluminum alloy with different magnesium content, this increment would be proportional to the content of magnesium. EDS mapping indicates the sodium introduced by the fluxes was distributed in the form of Na-rich particles in Al–Mg alloys and preferentially located near Al3Mg2(β) phase in the situation of high magnesium content.

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Mechanism to remove oxide inclusions from molten aluminum by solid fluxes refining method

Cited by 20 publications

References 13 publications

Melt refining and purification processes in Al alloys: a comprehensive study

Melt refining and purification processes in Al alloys: a comprehensive study

Influence of Vacancy Defect of Calcium Oxide Surface on the Wettability of Molten Alkali Metal Salt in Calcium Looping Process

Effect of Sodium-Containing Fluxes on the Residual Sodium Content and Distribution in Al–Mg Alloys

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