Microstructure of Coal Gangue and Precipitation of Heavy Metal Elements

Figure 4

XRD patterns of the fresh coal gangue. (a) Q: quartz (high); K: kaolinite (high); I: illite; I/M: illite-montmorillonite mixed layer; Cl: Chlorite; S: Smectite; D: dolomite (low); P: pyrite; L: siderite; C: calcite (low); F: feldspar; non: amorphous materials; O: others (low). (b) K: kaolinite (high); Q: quartz (high); I: illite (high); I/M: illite-montmorillonite mixed layer; S: siderite; P: pyrite (low); O: others (low).

(a) Sample number 1

(b) Sample number 2