The photovoltaic generates electricity through direct conversion of sunlight, has fastgrowing recently due to high global energy demand. Photovoltaic main material is silicon which needs refining process to fulfill the requirements. In this paper, the principle of silicon-slag refining was introduced and several types of imposing slag were reviewed. Boron removal from silicon using Si-based alloy and novel slag with active component were mentioned, and effects of slag refining processing parameters were discussed. According to the investigations, slag refining technique can remove a large amount of boron from MG-Si, and the potential industrial applications of slag refining technique were proposed.Представлен принцип переработки кремниевого шлака, рассмотрены несколько типов шлака. Было упомянуто об удалении бора из кремния с использованием сплава на основе кремния (Si) и нового шлака с активным компонентом, обсуждается эффект от процесса рафинирования шлака. Согласно исследованиям, процесс рафинирования шлака может удалить большое количество бора из MG-Si (металлургического кремния), а также предложена потенциальная промышленная технология рафинирования шлака.
Технологія переробки шлаку для металургійного процесу очищення кремнію: огляд. Rowaid Al-khazraji, Yaqiong Li, Lifeng ZhangПредставлено принцип переробки кремнієвого шлаку, розглянуто кілька типів шлакових систем. Розглядається видалення бору з кремнію з використанням сплаву на основі кремнію (Si) та нового шлаку з активним компонентом, обговорюваються наслідки від параметрів рафінування шлаку. За даними досліджень, технологія рафінування шлаку дозволяє видалити велику кількість бору з MG-Si (металургійного кремнію), запропоновано потенційне застосування у промисловості технологій рафінування шлаку.
Boron (B) removal by slag refining using CaO–SiO2–CaCl2 was investigated in metallurgical-grade silicon (MG-Si) and 75 wt% Si–Sn alloy. Experiments were conducted at 1500 °C for 15 min. The microstructure was characterized before and after refining. The effects of acid leaching, basicity, and slag/Si mass ratio on B removal were investigated. Experimental results showed that acid leaching had no effect on B removal from MG-Si but had a clear effect on the refined Si–Sn alloy after slag refining. The final B concentration was highly affected by the CaO/SiO2 mass ratio with minimum value, where the content of B was reduced from 18.36 ppmw to 5.5 ppmw at the CaO/SiO2 = 1.2 for MG-Si slag refining and from 18.36 ppmw to 3.7 ppmw at CaO/SiO2 = 1.5 for 75 wt% Si–Sn alloy. Increasing the slag mass ratio by 2:1 mass ratio also increased B removal efficiency by approximately 15–20% more than an increase by 1:1.
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