This study focuses on mineralogical and chemical characterization of clay of Sitakunda anticline, Bangladesh and potential suitability of this shale as raw materials in ceramic industries. The shale which is clay in t...This study focuses on mineralogical and chemical characterization of clay of Sitakunda anticline, Bangladesh and potential suitability of this shale as raw materials in ceramic industries. The shale which is clay in texture is composed of chlorite and kaolinite with common illite, smectite, quartz, mica and feldspar. There are two types of samples in color, grey and red. Chemical compositions of clay samples are analyzed by XRF and mineralogical composition of sample analyzed by XRD. Clay samples contain significant amount SiO2, Al2O3 and Fe2O3 with other minor compounds. The plasticity index (12.08 and 16.37) indicates medium ranges of the plasticity of clay. To determine the suitability of ceramic materials, samples were made in a rectangular shape for firing 850°C to 1100°C temperature. The samples were tested for different physical properties such as compressive strength, linear shrinkage, water absorption, porosity and bulk density. Low linear firing shrinkage (0.7% to 2.69%) and water absorption (1.5% to 11%) of the developed ceramic bodies were observed. Scanning Electron Microscope photographs confirm the vitrification of the ceramic bodies. The chemical, physical and ceramic properties of these clays indicate their suitability as raw materials for the production of a wide range of ceramic materials.展开更多
This study is performed to know the contamination level of heavy metals on the surrounding agricultural soils at the site of Barapukuria Coal Mine Company Limited (BCMCL). Total concentrations of eight heavy metals (C...This study is performed to know the contamination level of heavy metals on the surrounding agricultural soils at the site of Barapukuria Coal Mine Company Limited (BCMCL). Total concentrations of eight heavy metals (Cu, As, Cd, Zn, Pb, Cr, Ni and Mn) were measured in that soil. To calculate the contamination level, the enrichment factor (EF), geoaccumulation index (I<sub>geo</sub>) and Hakanson potential ecological risk index were done. I<sub>geo</sub> values indicated that the study areas at all stations were suffering from moderate contamination with As. The results of enrichment factor revealed that soils in all stations were in extremely high enrichment condition by As metal. Under Hakanson potential ecological risk index, the contamination coefficient () and potential ecological risk index () were calculated. The degree of contamination at BCMCL area reflects moderate contamination. By considering the ecological risk index of a particular heavy metal, the order is as follows: Cd > As > Cu > Pb > Ni > Cr > Zn and Cd has the highest risk index and poses the greatest damage to the BCMCL area’s soil. EF, I<sub>geo</sub> values and potential ecological risk index indicate that there is considerable As and Cd pollution, mainly caused by coal mine drainage water.展开更多
文摘This study focuses on mineralogical and chemical characterization of clay of Sitakunda anticline, Bangladesh and potential suitability of this shale as raw materials in ceramic industries. The shale which is clay in texture is composed of chlorite and kaolinite with common illite, smectite, quartz, mica and feldspar. There are two types of samples in color, grey and red. Chemical compositions of clay samples are analyzed by XRF and mineralogical composition of sample analyzed by XRD. Clay samples contain significant amount SiO2, Al2O3 and Fe2O3 with other minor compounds. The plasticity index (12.08 and 16.37) indicates medium ranges of the plasticity of clay. To determine the suitability of ceramic materials, samples were made in a rectangular shape for firing 850°C to 1100°C temperature. The samples were tested for different physical properties such as compressive strength, linear shrinkage, water absorption, porosity and bulk density. Low linear firing shrinkage (0.7% to 2.69%) and water absorption (1.5% to 11%) of the developed ceramic bodies were observed. Scanning Electron Microscope photographs confirm the vitrification of the ceramic bodies. The chemical, physical and ceramic properties of these clays indicate their suitability as raw materials for the production of a wide range of ceramic materials.
文摘This study is performed to know the contamination level of heavy metals on the surrounding agricultural soils at the site of Barapukuria Coal Mine Company Limited (BCMCL). Total concentrations of eight heavy metals (Cu, As, Cd, Zn, Pb, Cr, Ni and Mn) were measured in that soil. To calculate the contamination level, the enrichment factor (EF), geoaccumulation index (I<sub>geo</sub>) and Hakanson potential ecological risk index were done. I<sub>geo</sub> values indicated that the study areas at all stations were suffering from moderate contamination with As. The results of enrichment factor revealed that soils in all stations were in extremely high enrichment condition by As metal. Under Hakanson potential ecological risk index, the contamination coefficient () and potential ecological risk index () were calculated. The degree of contamination at BCMCL area reflects moderate contamination. By considering the ecological risk index of a particular heavy metal, the order is as follows: Cd > As > Cu > Pb > Ni > Cr > Zn and Cd has the highest risk index and poses the greatest damage to the BCMCL area’s soil. EF, I<sub>geo</sub> values and potential ecological risk index indicate that there is considerable As and Cd pollution, mainly caused by coal mine drainage water.
