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Depolymerization and application of kaolin —— Synthesis and characterization of zeolites and silica - alumina aerogel from kaolin

Abstract

所谓高岭土是一种以高岭石族粘土矿物为主的非金属矿产,它广泛应用于造纸、陶瓷、耐火材料、医药、化工,尤其是石油化工等领域。高岭石是地表最常见的粘土矿物之一,其理想化学式为Al4[Si4O10](OH)8,晶体结构是由铝氧二八面体层(O)和硅氧四面体层(T)按TO1:1排列而成,因氧、硅、铝的丰度位于地壳的前三位,因此是廉价合成铝硅酸盐沸石的理想矿物原料。但是晶态的高岭石具有极高的化学稳定性,无法直接用于沸石合成。所以传统的生产工艺在高岭土精矿用于合成沸石之前必须经700~900°C高温煅烧,将其转化为无定形的偏高岭土,以消除高岭土的化学稳定性。但是煅烧工艺需要消耗大量燃料,能耗高、污染重,与低碳...Kaolin is non-metallic minerals of clay mineral and its main component is kaolinite, which are widely used in papermaking, ceramics, refractories, pharmaceutical, chemical, petrochemical and other fields. Kaolinite possesses a 1:1 layer structure constructed of [AlO6] octahedral and [SiO4] tetrahedral sheets, which is the preferable natural material for its low cost and wide availability for synth...学位:工学博士院系专业:材料学院_材料学学号:2072012015331

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