Existing form and harmful effects of sodium in Al–4.5%Cu alloy

Feng, Lidong; Sun, Yuanyuan; Zhao, Xiaolin; Wang, Riming; Zhang, Kai; Yang, Jinyue

doi:10.1016/s1003-6326(15)63998-x

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…He considered that sodium probably clustered as particles instead of films, but it was a hypothesis. In addition, Feng [11] suggested that sodium introduced by flux is enriched on the grain boundary of Al-Cu alloy, reducing the bonding force between the matrix and CuAl 2 phase. Sweet [12] observed that sodium exists as discrete particles on the grain boundary in Al-Li alloy.…”

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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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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Reaction Behavior of Na2SO4-Containing Copper Matte Powders in a Simulated Flash Converting Process

Xia

Zhu

et al. 2021

Metall Mater Trans B

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Sodium sulfate accumulation in the water system is a common problem in the production of primary metals from sulfide minerals. In flash smelting-flash converting copper smelters, when molten copper matte quenched in industrial water to produce matte granules, Na2SO4 precipitated and entered the system, which had negative influence on the matte converting process. The reaction behaviors of copper matte powder containing Na2SO4 have been studied through thermodynamic calculation and single-particle experiments. Calculated results showed that a liquid sulfate phase, Na2S containing copper matte, and Cu-Na alloy may form in the processing conditions of the converting process. The influence of the Na2SO4 dosage, fluxing conditions, and processing temperature has been systematically studied, and the results obtained showed that: 1); Na2SO4 physically precipitated on matte particles, and the Cu-Na alloy phase was found within copper phase in reacted particles; 2); Na2SO4 contamination hindered oxygen transfer by forming a low melting sulfate phase, and the de-sulfuration rate of matte powder changed dramatically along with the variation in Na2SO4 amount; 3); CaO flux was able to promote the converting reactions and Na2SO4 transformation; 4); Na2SO4 melt and formed a sulphate layer on matte particles at 1000 ℃, Cu-Na alloy phase was found in samples collected at 1200 ℃, and Cu-Na-O phase was detected in blister copper at 1600 ℃. / 20

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