氧化铝的水热化学研究Ⅱ．α-三水铝石、湃铝石和诺水铝石脱水产物的再水合现象  

STUDIES ON HYDROTHERMAL BEHAVIOR OF ALUMINA Ⅱ.REHYDRATION OF ALUMINAS DERIVED FROM GIBBSITE,BAYERITE AND NORDSTRANDITE

作　　者：李光辉[1] 叶岗[1] 路春茂[1] 张明海[1] 

机构地区：[1]石油化工科学研究院

出　　处：《石油学报（石油加工）》1996年第3期107-112,共6页Acta Petrolei Sinica(Petroleum Processing Section)

摘　　要：用ＸＲＤ方法研究了α－三水铝石在常压及真空中１０００℃以下的脱水产物和湃铝石／诺水铝石在常压１０００℃以下的脱水产物，经１７０℃水热处理和自身压力条件下的晶相变化。结果表明，上述诸脱水产物均可发生再水合现象，最终的转化产物均是薄水铝石，而非它们的原起始物。通过对高温氧化铝部分再水合样品的晶相分析可知，上述各脱水产物的再水合变化历程都是直接生成水合物，而不是原水合氧化铝脱水相变的逆过程。The hydrothermal behavior of various types of alumina was investigated by means of XRD,which were derived from calcination of gibbsite,bayerite and nordstrandite at temperatures below 1000℃ and normal pressures or in vacuo.It was found that not only are χ Al 2O 3 and η Al 2O 3 capable of rehydration,but also all the above mentioned transitional aluminas can be rehydrated when in contact with H 2O under its saturation pressure at temperature of 170℃.Only boehmite was yielded from the rehydration at 170℃ for 96h.The XRD patterns of partial rehydrated aluminas calcined at high temperatures showed that dehydrates were directly rehydrated to the hydrates,thus the rehydration process was not the inverse process of dehydration.

关 键 词：氧化铝 薄水铝石 三水铝石 湃铝石 诺水铝石 

分 类 号：O614.31[理学—无机化学] O611.62[理学—化学]