Table 2 The intensity ratio of D and G bands (ID/IG) and 2D and G bands (I2D/IG) for the graphite obtained from those attached to rocks via acid-extraction (AEG) after subjecting to heat treatment at different temperatures.

From: Sustainable mining of natural vein graphite via acid-extraction from waste attached to rock pieces of vein banks

500 °C

600 °C

700 °C

800 °C

ID/IG

I2D/IG

ID/IG

I2D/IG

ID/IG

I2D/IG

ID/IG

I2D/IG

0.04

0.65

0.02

0.55

0.04

0.58

0.06

0.55

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