Study On Modification Of Kaolin Of Coal Measures Of Inner Mongolia

The reserves of kaolin of coal measures is more abundant than that of Non-soft coal measures kaolin in China. It is the advantage of resources of kaolin of our country. It can be used in a lot of fields extensively through deep processing. Kaolin's reserves of coal measures of area of the Inner Mongolia of our country is abundant., but the utilization ratio of raw materials is low, which cause resources to waste and a large of kaolin of coal measures is piled up. It has important realistic meanings to go on the research of modification on kaolin of coal measures of Inner Mongolia, which can improve its application performance, make the best of it and improve the environment . Su Zhou kaolin is high-quality kaolin, it has already been applied in industry extensively. So my subject of research is going on the research of modificattion on kaolin of coal measures of Inner Mongolia to make it apply to industry extensively as Su Zhou kaolin. the chemical composition and crystal structure of coal measures kaolin of Inner Mongolia and kaolin of Su Zhou have been compared through the means of chemical analyse of the element, XRD ,TEM and SEM. The result indicates that the crystal structure of hard-quality kaolin of coal measures of Inner Mongolia and kaolin of Su Zhou are perfect and the soft kaolin's crystal structure of coal measures of Inner Mongolia is not good; Kaolin of Coal measures of Inner Mongolia contains more carbon,iron and titanium than Su Zhou kaolin, kaolin of hard-quality of coal measures of Inner Mongolia contains lower carbon ,iron and titanium than kaolin of soft-quality of coal measures of Inner Mongolia. Have studied calcination temperature on the effect of the loss of weight, white degree and crystal structure of kaolin of coal measures of Inner Mongolia and kaolin of Su Zhou by calcination and DTA experiment. The characterization of kaolin calcined is described by XRD technology. It is shown that the loss of weight is close for kaolin of hard-quality coal measures of Inner Mongolia and Su Zhou kaolin, while the loss of weight of kaolin of soft-quality coal measures of Inner Mongolia is nearly twice that of them. With the rise of calcination temperature, Kaolin of Inner Mongolia and Su Zhou become whiter . Kaolin of Su Zhou is whiter than kaolin of coal measures of Inner Mongolia at the same calcination temperature. It is very difficult for kaolin to destroy the structure of Kaolinite of kaolin when calcination temperature is less 600 degrees Centigrade, Kaolin can keep the structure sub-Kaolinite when calcination temperature between 700 and 900 degrees Centigrade, sub-Kaolinite begins to become Mullite after calcined at 1000 degrees Centigrade. Research of acid modification of kaolin of coal measures of Inner Mongolia and Su Zhou is carried out, the characterization of acid-modified kaolin is described by pyridine-TPD and BET technology, and study the catalysis reaction performance of acid-modified kaolin and the cracked catalyst made from acid-modified kaolin as host component part. The result shows that calcination temperature has a big influence on extraction ratio of alumina from Kaolinite, the extraction ratio of alumina is higher for sub-kaolinite; In addition, the extraction ratio of alumina increase with the increase of reaction time. Surface acidity of kaolin is very weak before it is treated by acid, surface acidity of kaolin is strengthened with the increase of SiO2/Al2O3 of acid-modified kaolin. The surface area has a remarkable increase and the pore distribution is more centralized for kaolin after it is treated by acid. The cracking reaction shows that cracking performance is better for the same kind of acid-modified kaolin with higher SiO2/Al2O3. The cracking performance of cracking catalyst employing the acid-modified kaolin of hard-quality coal measures of Inner Mongolia as matrix is almost as good as that of acid-modified kaolin of Su Zhu as matrix.