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研究了安徽明光富镁坡缕石和江苏盱眙贫镁坡缕石热处理后的结构变化,结果表明:富镁坡缕石八面体片对称性好,晶体结构稳定性高,结晶度高,热稳定性好;贫镁坡缕石八面体片中存在连续八面体空位,对称性差,晶体结构稳定性低,结晶度差,热稳定性差。在脱除结晶水和羟基过程中,富镁坡缕石由正交晶系转变为单斜晶系,层间距变小,孔道变形、塌陷但一直保持链层结构,显示晶质特性;而贫镁坡缕石的晶体结构发生折叠,链层结构逐步破坏,700℃煅烧后部分四面体片遭到破坏,虽然显示多晶特性为主,但开始出现非晶化现象。
The structural changes of Mg-rich palygorskite in Mingguang of Anhui Province and the poor-quality palygorskite of Castanopsis fargesii in Anhui Province were studied. The results show that the octahedral palygorskite-rich sheet has good symmetry, high crystal structure stability, high crystallinity and thermal stability Good; poorly matured palygorsk octahedral sheet there are continuous octahedral vacancies, symmetry is poor, low stability of the crystal structure, poor crystallinity, poor thermal stability. In the process of removal of water and hydroxyl, the magnesium rich palygorskite changes from orthorhombic system to monoclinic system, the interlayer spacing becomes smaller, the channel deforms and collapses but keeps the chain structure, which shows the crystalline properties; while the poor The crystal structure of the plagiogranulite is folded and the chain structure is gradually destroyed. After calcination at 700 ℃, some of the tetrahedral sheets are destroyed. Although the polycrystalline characteristics are dominant, the amorphous phase begins to appear.