SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (1): 307-317.DOI: 10.1016/j.cjche.2018.11.016

• Materials and Product Engineering • Previous Articles     Next Articles

Surface and structure characteristics of commercial K-Feldspar powders: Effects of temperature and leaching media

Hamed Salimkhani1, Tohid Joodi1, Aidin Bordbar-Khiabani2, Ali Motei Dizaji1, Behnam Abdolalipour3, Ali Azizi1   

  1. 1 Department of Materials Engineering, University of Tabriz, P. O. Box 51666-16471, Tabriz, Iran;
    2 Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, P. O. Box 14155-4777, Tehran, Iran;
    3 Department of Mining and Metallurgy, Amirkabir University of Technology, P. O. Box 159163-4311, Tehran, Iran
  • Received:2018-09-23 Revised:2018-11-18 Online:2020-03-31 Published:2020-01-28
  • Contact: Hamed Salimkhani

Surface and structure characteristics of commercial K-Feldspar powders: Effects of temperature and leaching media

Hamed Salimkhani1, Tohid Joodi1, Aidin Bordbar-Khiabani2, Ali Motei Dizaji1, Behnam Abdolalipour3, Ali Azizi1   

  1. 1 Department of Materials Engineering, University of Tabriz, P. O. Box 51666-16471, Tabriz, Iran;
    2 Department of Nanotechnology and Advanced Materials, Materials and Energy Research Center, P. O. Box 14155-4777, Tehran, Iran;
    3 Department of Mining and Metallurgy, Amirkabir University of Technology, P. O. Box 159163-4311, Tehran, Iran
  • 通讯作者: Hamed Salimkhani

Abstract: This study presents morphological and structural variations of K-Feldspar mineral after acid treatment. Both organic and inorganic acids such as C2H2O4, HCl, HNO3 and H2SO4 were employed for this purpose. Another aim of this study was to find an optimum experimental condition for iron (Fe) removal with a minimum damage on the structure of K-Feldspar in which high whiteness index is obtained. The effect of different parameters such as concentration, pH and temperature on the final structure of this mineral was investigated. To find out the chemical composition of powder, XRF was utilized. FTIR, XRD and SEM were employed to study the structure of mineral. Spectrophotometry was chosen to analyze whiteness index of powder after acid treatment. It was found that O—Al—O bond at 647 cm-1 for H2SO4 and HNO3 treated sample disappeared. However, HCl and C2H2O4 were ineffective at this band. In addition, the results revealed an increase in K-Feldspar content, a decrease in Fe content, an increase in whiteness index and no significant structural change for C2H2O4 leached sample. Whiteness index of 91% was obtained for C2H2O4 leached sample with the pH of 2.5 to 3 at temperature of 50℃ and during 1 h.

Key words: K-Feldspar, Iron oxide, Organic and inorganic acids, FTIR

摘要: This study presents morphological and structural variations of K-Feldspar mineral after acid treatment. Both organic and inorganic acids such as C2H2O4, HCl, HNO3 and H2SO4 were employed for this purpose. Another aim of this study was to find an optimum experimental condition for iron (Fe) removal with a minimum damage on the structure of K-Feldspar in which high whiteness index is obtained. The effect of different parameters such as concentration, pH and temperature on the final structure of this mineral was investigated. To find out the chemical composition of powder, XRF was utilized. FTIR, XRD and SEM were employed to study the structure of mineral. Spectrophotometry was chosen to analyze whiteness index of powder after acid treatment. It was found that O—Al—O bond at 647 cm-1 for H2SO4 and HNO3 treated sample disappeared. However, HCl and C2H2O4 were ineffective at this band. In addition, the results revealed an increase in K-Feldspar content, a decrease in Fe content, an increase in whiteness index and no significant structural change for C2H2O4 leached sample. Whiteness index of 91% was obtained for C2H2O4 leached sample with the pH of 2.5 to 3 at temperature of 50℃ and during 1 h.

关键词: K-Feldspar, Iron oxide, Organic and inorganic acids, FTIR