Abstract
Clay minerals in the Hadong Kaolin, Korea were characterized by X-ray diffraction, transmission electron microscopy and chemical analysis. Two kinds of samples, pink DK-7 purified with a high gradient magnetic separator and white WA were separated to <5, <2 and <0.3μm fractions. Clay minerals contained in DK-7 and WA samples were halloysite (10Å), kaolinite and a small amount of sericite. The amount of kaolinite in DK-7 was higher than that in WA. Kaolinite and sericite were not found in the <0.3μm fraction samples. Particles of halloysite (10Å) were a short tube and those of kaolinite and sericite were irregular plates. Chemical composition of halloysite (10Å) in the <5μm fraction sample showed fairly Al2O3-rich composition than ideal one due to the co-existence of low crystalline aluminum hydroxide. The amount of iron in halloysite was around 1wt% and 0.5wt% in DK-7 and WA, respectively.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
