Blar i NTNU Open på forfatter "Zhu, Mengyi"
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Characterization of Recovered Silicon from End-of-Life PV Modules, and its Refining by Leaching and Vacuum Refining Techniques
Norling, Vilde Frydenlund (Master thesis, 2024)Denne masteroppgaven utforsket rensing av silisium fra utgåtte fotovoltaiske moduler ved hjelp av hydrometallurgiske metoder og vakuumraffinering. Motivasjonen ligger i de kommende utfordringene og mulighetene som følger ... -
Combined silicon refining for boron removal and Si-Kerf recycling using K2O-CaO-SiO2 slags
Zhu, Mengyi; Wu, Guixuan; Tang, Kai; Müller, Michael; Safarian, Jafar (Peer reviewed; Journal article, 2024) -
Combined silicon refining for boron removal and Si-Kerf recycling using K2O-CaO-SiO2 slags
Zhu, Mengyi; Wu, Guixuan; Tang, Kai; Müller, Michael; Safarian, Jafar (Peer reviewed; Journal article, 2024)It is crucial for the photovoltaic (PV) industry to establish a circular materials flow for more sustainable solar silicon production. In the present work, a series of K2O-SiO2 and K2O-CaO-SiO2 slags were examined for the ... -
Comparative kinetics study of different iron-containing pellets with hydrogen at isothermal conditions
Kar, Manish Kumar; Zhu, Mengyi; Safarian, Jafar (Peer reviewed; Journal article, 2023)Using hydrogen to produce iron is a promising way for the steel industry to achieve the goal of carbon neutrality. The reducibility of iron-bearing oxides by hydrogen significantly impacts the productivity and energy ... -
Effects of La2O3 Addition into CaO-SiO2 Slag: Structural Evolution and Impurity Separation from Si-Sn Alloy
Zhu, Mengyi; Wu, Guixuan; Azarov, Alexander; Monakhov, Eduard; Tang, Kai; Müller, Michael; Safarian, Jafar (Peer reviewed; Journal article, 2021)Boron (B) and phosphorus (P) are the most problematic impurities to be removed in the production of solar-grade silicon by the metallurgical process. In this work, the distribution of B and P between CaO-(La2O3)-SiO2 slags ... -
Impurity removal from Si by Si-Ca-Mg ternary alloying-leaching system
Zhu, Mengyi; Wan, Di; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2020)In this work, Si-Ca-Mg alloys were made with different compositions and solidification conditions to investigate the impurity segregation and separation performance from Si, especially for the crucial P impurity at several ... -
New Insights into Silicon Purification by AlloyingLeaching Refining: A Comparative Study of MgSi, CaSi, and CaMgSi Systems
Zhu, Mengyi; Shengying, Yue; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2020)In the present work, a comparative study of the silicon alloying–leaching purification process was carried out on the recently developed Mg–Si system, the Ca–Si system, and the novel ternary Ca–Mg–Si system. Insights were ... -
P removal from Si by Si-Ca-Al alloying-leaching refining: Effect of Al and the CaAl2Si2 phase
Zhu, Mengyi; Yue, Shengying; Wu, Guixuan; Tang, Kai; Xu, Yijiang; Safarian, Jafar (Peer reviewed; Journal article, 2021)Phosphorus (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 ... -
Phosphorus separation from metallurgical-grade silicon by magnesium alloying and acid leaching
Zhu, Mengyi; Azarov, Alexander; Monakhov, Eduard; Tang, Kai; Safarian, Jafar (Peer reviewed; Journal article, 2020)n this paper, the separation of phosphorus from metallurgical-grade silicon was investigated based on an Mgalloying and HCl leaching approach. Experimental results show that P concentration was reduced from initial15.1pp ... -
Recycling of industrial silicon-kerf waste via leaching and flux-melting.
Garshol, Askh Kano; Hannah, Skarsvåg (Bachelor thesis, 2023)Produksjonen av solar grade silisium oblater som brukes i solcelleproduksjon er en lang og kompleks prosess som resultater i at 50% av rent silisium blir kastet vekk etter kutte prossesen. Dette har vært et problem som har ... -
Silicon purification by acid leaching and slag refining techniques
Zhu, Mengyi (Doctoral theses at NTNU;2021:117, Doctoral thesis, 2021)Solar energy has become the most popular and fastest-growing renewable energy resource worldwide. However, it still requires the current solar-grade silicon (SoG-Si, purity 99.9999%) production with a larger manufacturing ... -
Silicon refining through alloying by calcium and magnesium, controlled solidification and leaching
Bergheim, Jarle (Bachelor thesis, 2022)I denne bacheloroppgaven var målet å bedre forstå hvordan avkjølingshastighet påvirker raffinering av silisium, når legeringssystemet Si-Ca-Mg brukes i forbindelse med utluting med syre. Mikrostruktur og effektiv fjerning ...