Up-grading of Locally Produced Metallurgical Grade Silicon (MG-Si)

Document Type : Original Article

Authors

1 Minerals Technology Department – Pyrometallurgy Lab., Central metallurgical Rsearch & Development Institute (CMRDI)

2 Minerals Technology Department – Pyrometallurgy Lab., Central metallurgical Rsearch & Development Institute (CMRDI)

3 Physical Chemistry , Faculty of Science(Girls), Al-Azhar University

Abstract

Locally produced metallurgical grade silicon (MG-Si ~ 97%) was upgraded by using wet-milling process. This is including milling of MG-Si in presence of 2M HCl solution for different time periods up to 60 min. The effect of milling time in HCl solution was studied. Soaking of the milled products (at optimum milling time 15 min) with continuous stirring in the same solution of 2M HCl for interval time up to 240 min also were investigated. Finally, the effect of addition of 2M HF to the milled product was discussed. The leached samples were investigated by X-ray fluorescence (XRF), and scanning electron microscope (SEM). It was found that, 99.92% purity of MG-Si was achieved after 15 min milling time with 2M HCl followed by addition 2M HF for 240 min with continuous stirring. About 97 % removal efficiency of the impurities was obtained.

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Egyptian Journal of Chemistry
Volume 61, Issue 1 - Serial Number 1
January and February 2018
Pages 155-161

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History

  • Receive Date: 28 November 2017
  • Revise Date: 18 December 2017
  • Accept Date: 20 December 2017

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