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000904030 1001_ $$0P:(DE-HGF)0$$aZhu, Mengyi$$b0
000904030 245__ $$aP removal from Si by Si-Ca-Al alloying-leaching refining: Effect of Al and the CaAl2Si2 phase
000904030 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2021
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000904030 520__ $$aPhosphorus (P) is a critical impurity in metallurgical-grade Si that needed to be removed for solar-grade Si production. The Si-Ca-Al-P system is one of the most crucial alloy systems for Si refining, where P can be separated by either the Si-Al solvent refining or the Si-Ca alloying-leaching process. In this work, a series of Si-Ca-Al alloys were obtained to investigate the role of alloy composition and the CaAl2Si2 phase in P segregation and separation. The used alumina crucible led to heavy Al contamination and resulted in unexpected Si-Ca-Al alloy compositions. CaAl2Si2 and CaSi2 were found as the main precipitates, and relatively higher P content was detected in the CaAl2Si2 phase. Leaching experiments indicate that P removal degree increases with increasing Ca/Al ratio and increasing total alloying amount (Ca + Al). Effects of alloy composition were further analyzed by statistical methods, which indicates Ca firmly plays a strong, positive, and monotonic role in P removal while no strong attraction between Al and P. Theoretical P removal model for the Si-Ca-Al system was established and in good agreement with measured results. Interaction coefficients of Ca and Al to P were fitted as and , which further confirms Ca is the essential driving force for P segregation. Finally, the possibility of P solid solution formation was verified by first-principle simulations that both CaAl2Si2 and CaSi2 are able to dissolve P, especially through the Si site, but the CaAl2Si2 phase is more favourable for P dissolution than CaSi2, which explains the reason of the often detected high P content in CaAl2Si2.
000904030 536__ $$0G:(DE-HGF)POF4-1231$$a1231 - Electrochemistry for Hydrogen (POF4-123)$$cPOF4-123$$fPOF IV$$x0
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000904030 7001_ $$0P:(DE-HGF)0$$aYue, Shengying$$b1
000904030 7001_ $$0P:(DE-Juel1)145147$$aWu, Guixuan$$b2$$ufzj
000904030 7001_ $$0P:(DE-HGF)0$$aTang, Kai$$b3
000904030 7001_ $$0P:(DE-HGF)0$$aXu, Yijiang$$b4
000904030 7001_ $$0P:(DE-HGF)0$$aSafarian, Jafar$$b5
000904030 773__ $$0PERI:(DE-600)2022535-0$$a10.1016/j.seppur.2021.118675$$gVol. 271, p. 118675 -$$p118675 -$$tSeparation and purification technology$$v271$$x1383-5866$$y2021
000904030 8564_ $$uhttps://juser.fz-juelich.de/record/904030/files/1-s2.0-S1383586621003877-main.pdf$$yOpenAccess
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