Experimental Study on Comprehensive Utilization of Kaolin Ore in Guangdong
The occurrence state of iron minerals in a kind of kaolin ore in Guangdong is relatively complex.A portion of iron minerals is irremovable as they disseminate in the lattice of kaolinite,illite and other minerals in an isomorphic manner.For this reason,the calcined kaolin concentrate possesses a lower whiteness than the natural whiteness.In order to efficiently exploit and utilize the kaolin ore,a process consisting of slurry tamping,spiral classifier classification and hydrocyclone classification was adopted,resulting in a kaolin concentrate grading 30.02%Al2 O3 at 61.70%recovery with the content of impurity Fe2 O3 at 1.15%,which can reach grade Ⅲ standard of kaolin for ceramic industry.The classification downflow was then subjected to a process consisting of grinding,magnetic separation and hydrocyclone classification,resulting in a quartz sand concentrate and a sericite concentrate.The quartz sand concentrate,containing 97.11%SiO2 and 0.058%Fe2 O3,can satisfy the standard for low quality quartz for glass industry,and the sericite concentrate,containing 7.07%K2 O,31.22%Al2 O3 and 48.32%SiO2,with natural whiteness at 65.53%,can be used in the coating industry.The magnetic separation results in the tailings with a yield of 8.41%and SiO2 content of 76.33%,which can be used as auxiliary materials for building sand.Through this process,different minerals can be effectively separated to achieve the purpose of comprehensive utilization of kaolin ore.
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