| Kaolin is a kind of clay mineral aggregates with kaolinite as the main mineral composition, possessing many valuable technological properties, such as Such as plasticity, bonding, fire resistance, insulation and heat of the chemical stability, etc. Based on these properties, it can be widely used in ceramics, paper, refractories, rubber, plastics, petrochemicals, household chemicals, pesticides, pharmaceuticals, textile,and electronics space. However, iron, titanium, manganese ions and a large number of organic pigments and carbon in kaolin minerals affect the whiteness of ore and products, which in turn limiting the scope of application of the product. Therefore, deironing and bleaching has become a top priority in kaolin application industry.Fuxin kaolin are soft kaolin, with high sand content and high iron content (up to 5.63%); natural ore whiteness is only 33.57%, which can not be applied directly and must be whitened.In this paper, by XRD, full elemental analysis and scanning electron microscopy of the Fuxin kaolin mineralogy analysis and test, results show that:The main ore minerals in this kaolin mine are kaolin (Al2(Si2O5)(OH)4)with the content of 51.5%, quartz (SiO2) with the content of 45.4%, montmorillonite ((Na; Ca)0.3 (Al; Mg) 2Si4O10 (OH)22nH2O) with the content of 3.2%. With calcination, acid leaching, sedimentation separation and acid leaching and calcination method of combined chemical bleaching, respectively Fuxin region of soft high-speed rail kaolin whitening carried out tests on various processes in the main influencing factors are analyzed. On this basis, the paper by chemical reduction method and the calcination Whitening exploration study with the purpose of arrive at reduction applied to the kaolin bleaching process, and came to restore the best whitening bleaching and calcination process conditions, application in industrial production. |
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