Genesis of Mayouom kaolin deposit (western Cameroon)

Potential of a low-cost bentonite for heavy metal abstraction from binary component system

“…The SieO bending vibration was indicated by absorption bands at 1163.11e1008.8 cm À1 , while the SieO stretching vibrations were observed at 798.56e644.25 cm À1 . The presence of the AleO bending vibration was revealed by the band at 914.29 cm À1 , while absorptions at 538.16e432.07 cm À1 correspond to the AleOeSi skeletal vibrations (Njoya et al, 2006;Vempati et al, 1996). After the adsorption of Ni(II) and Mn(II) ions from the binary solution by UAB, there were shifts in the frequency of absorption from 3443.05 cm À1 to 3446.91 cm À1 , 2360.95 cm À1 to 2347.45 cm À1 , 1631.83 cm À1 to 1629.9 cm -1 and the disappearance of the band at 3416.05 cm À1 which indicated the use of the negatively charged eOH group for binding of positively charged metal ions to the surface of UAB.…”

Cumulative pore volume, pore size distribution and phases percolation in porous inorganic polymer composites: Relation microstructure and effective thermal conductivity

“…A standard kaolin form Mayouom, Cameroon [15], was calcined for 4h at 700°C and ground to fine powder under 80 µm. The Si/Al molar ratio of the standard metakaolin (MK) was 1.14 far from the ideal Si/Al ratio for solid geopolymer precursors which is described to be between 2 and 3 [3,4].…”

Fourier transform infrared spectroscopy and thermal analyses of kaolinitic clays from South Africa and Cameroon

“…Diko (2012) further observed that end products from the studied South African deposits are often characterized by defects such as warping, cracking, 4 ] is a common phyllosilicate mineral, widely employed as raw material in ceramics, paper filling and coating, refractory, fiberglass, cement, rubber and plastics, paint, catalyst, pharmaceutics and agriculture (Ekosse, 2010;Diko et al, 2011). The minerals of the kaolin group comprises kaolinite, dickite, nacrite, and halloysite with kaolinite being the most common (Murray, 2007). Structurally they consist of the so-called 1:1 layers of combined silicate sheets (Si 2 O 5 ) bonded to aluminium oxide/hydroxide [Al 2 (OH) 4 ] layers, which are continuous in the a-and b-axis directions and are stacked one above the other in the c-axis direction.…”

“…Structurally they consist of the so-called 1:1 layers of combined silicate sheets (Si 2 O 5 ) bonded to aluminium oxide/hydroxide [Al 2 (OH) 4 ] layers, which are continuous in the a-and b-axis directions and are stacked one above the other in the c-axis direction. Generally, the differences in kaolin minerals are related to the number of unit layers and manner in which they are stacked above each other (Murray, 2007;Vaculíková et al, 2011).…”