The chemical composition
of SCBA carried out by X-ray diffraction
between 10°- 65° 2θ is shown in Figure 1,
which consists of quartz (SiO2; JCPDS
85-1054), calcite (CaCO3; JCPDS 83-1762),
iron oxide (FeO; JCPDS 01-1223) and
carbon (C; JCPDS 26-1077), respectively.