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- W2016091972 abstract "Previous studies have shown that the metamorphic grade of carbonaceous material (CM) can be quantified by an index known as the degree of graphitization. This index uses XRD to measure the interplaner d-spacings of graphitic material and to assess the degree of polymerization and ordering in the CM structure. Traditional methods employ digestion of the silicate and oxide fractions by HF and HCl acid treatments. Unfortunately, this procedure often leaves behind insoluble residues of heavy minerals and fluorosilicate by-products. A new method was tried, taking advantage of the density difference between CM and the inorganic mineral phases prior to treatment with acids. Using ultrasonic disaggregation, separation is achieved by removing the low-density fraction that floats on top of a ground sample suspension after sedimentation. Subsequently this low-density fraction can be acid treated to concentrate CM. This paper is essentially a comparison of the two techniques for sample preparation with an examination of both pre- and post-treatment products by XRD and an evaluation of the graphitization index." @default.
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- W2016091972 date "1992-11-01" @default.
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- W2016091972 title "An ultrasonic method for the separation of carbonaceous material from schists for the determination of graphitization degree by X-ray diffraction" @default.
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- W2016091972 doi "https://doi.org/10.1016/0009-2541(92)90112-i" @default.
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