Comparative study of microstructural characteristics and stored energy of mechanically activated hematite in different grinding environments |
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| Authors: | Parviz Pourghahramani Eric Forssberg |
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| Institution: | Division of Mineral Processing, Luleå University of Technology, Luleå, Sweden |
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| Abstract: | Hematite concentrate was mechanically treated using different milling machines and experimental conditions in air atmosphere. The changes in phase constitution, particles size, specific surface area, lattice parameters and X-ray amorphous phase fraction of activated hematite were determined. It was found that the agglomeration of the particles take place during extended milling with accessible pores for Nitrogen gas. The higher media surface brought about the largest specific surface area whatever milling devices used. After 9 h of grinding with higher media surface, the maximum and minimum specific surface area resulted from the grinding in the tumbling and vibratory mills, accounting for 6.83 m2/g and 18.42 m2/g, respectively. For the same grinding condition, tumbling mill produced the lowest X-ray amorphous phase. The maximum X-ray amorphous material estimated around 85% from the grinding in the planetary mill with higher media surface for 9 h of milling. |
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| Keywords: | grinding methods mechanical activation line broadening analysis microstructure structural changes |
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