Graphite Equivalent Evaluation of Anthracite-Associated Graphite by Raman Spectroscopy

Area of Science:

• Geochemistry
• Materials Science
• Analytical Chemistry

Background:

• Anthracite-associated graphite is a valuable resource with diverse applications beyond fuel.
• Accurate quantification of graphite content is crucial for resource evaluation and utilization.

Purpose of the Study:

• To develop and validate a method for evaluating the graphite equivalent of anthracite-associated graphite using Raman spectroscopy.
• To establish a reliable quantitative analysis technique for this important carbon material.

Main Methods:

• Preparation of standard samples of graphite-anthracite with known graphite concentrations.
• Acquisition of Raman spectra using a Raman spectrometer.
• Peak-fitting analysis of D and G peaks to extract spectral parameters (position, intensity ratio, half-width, area).
• Development of a standard curve and fitting equation based on peak area data.

Main Results:

• Trends in Raman spectral parameters (D and G peaks) were identified in relation to graphite content.
• A standard curve and fitting equation with a high goodness of fit (R² = 0.9984) were established.
• The developed method was successfully applied to evaluate graphite content in 100 natural samples.

Conclusions:

• Raman spectroscopy, specifically D and G peak analysis, provides a robust method for graphite equivalent evaluation of anthracite-associated graphite.
• The established quantitative method offers a reliable tool for assessing this significant graphite resource.