An efficient method combining thermal annealing and acid leaching for impurities removal from silica intended for photovoltaic application

Bulletin of materials science

M Hajji²  M Khalifa¹  H Ezzaouia¹ 

[1] Laboratoire de Photovoltaïque, CRTEn, Technopôle de Borj-Cédria, BP 95 CP 2050, Hammam-Lif, Tunisia$$Laboratoire de Photovoltaïque, CRTEn, Technopôle de Borj-Cédria, BP 95 CP 2050, Hammam-Lif, TunisiaLaboratoire de Photovoltaïque, CRTEn, Technopôle de Borj-Cédria, BP 95 CP 2050, Hammam-Lif, Tunisia$$;Laboratoire de Photovoltaïque, CRTEn, Technopôle de Borj-Cédria, BP 95 CP 2050, Hammam-Lif, Tunisia$$Institut Supérieur d’Electronique et de Communication de Sfax, Route de Tunis Km 10, Cité El Ons, B.P. 1163, 3021, Sfax, Tunisia$$Laboratoire de Photovoltaïque, CRTEn, Technopôle de Borj-Cédria, BP 95 CP 2050, Hammam-Lif, TunisiaLaboratoire de Photovoltaïque, CRTEn, Technopôle de Borj-Cédria, BP 95 CP 2050, Hammam-Lif, Tunisia$$Institut Supérieur d’Electronique et de Communication de Sfax, Route de Tunis Km 10, Cité El Ons, B.P. 1163, 3021, Sfax, Tunisia$$Institut Supérieur d’Electronique et de Communication de Sfax, Route de Tunis Km 10, Cité El Ons, B.P. 1163, 3021, Sfax, TunisiaLaboratoire de Photovoltaïque, CRTEn, Technopôle de Borj-Cédria, BP 95 CP 2050, Hammam-Lif, Tunisia$$Institut Supérieur d’Electronique et de Communication de Sfax, Route de Tunis Km 10, Cité El Ons, B.P. 1163, 3021, Sfax, Tunisia$$

关键词: Silica;    acid leaching;    thermal annealing;    ICPâ€�?�AES.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

This work investigates the photothermal treatment of silica sand to reduce impurities to a low level suitable for the production of acceptable solar grade silicon for photovoltaic application. It describes experiment carried out by using a tungsten lamp furnace to purify silica under controlled atmosphere. This process enables to attract impurities to the surface of silica grains where they can be easily extracted by partial dissolution in an acid mixture. Thus obtained silica was investigated by inductively coupled plasma atomic emission spectrometry (ICP�?�AES) method. Major impurities present in silica sand were Al, K, Fe, Na, Ca, Mg and B. Among the new products, almost major impurities were removed effectively. Indeed purity degree, given by characterization of ICP�?�AES, passes from 99.76 to 99.96% and the average impurity removal efficiency is 83.33%.

【 授权许可】

Unknown