Microstructure of Coal Gangue and Precipitation of Heavy Metal Elements

Figure 5

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

(a) Sample number 1

(b) Sample number 2