Advances in Materials Science and Engineering / 2016 / Article / Fig 4

Research Article

A Novel Environmental Route to Ambient Pressure Dried Thermal Insulating Silica Aerogel via Recycled Coal Gangue

Figure 4

X-ray diffraction of coal gangue after Na2CO3 activation and H2SO4 wash and typical chemical formula of the mineral components: quartz (SiO2), kaolinite (Al2Si2O5(OH)4), albite (NaAlSi3O8), nepheline (KNa3(AlSiO4)4), lime (CaO), sodium silicate (Na2SiO2), illite (KAl2[(Al,Si)Si3O10]), ankerite (CaMg(CO3)2), siderite (FeCO3), and gismondine (Ca(Al2Si3O10)·3H2O).

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