FORMATION OF ALUMINUM HYDROXIDES AS INFLUENCED BY ALUMINUM SALTS AND BASES

被引：46

作者：

PRODROMOU, KP ^{[1
]}

PAVLATOUVE, AS ^{[1
]}

机构：

[1] ARISTOTELIAN UNIV THESSALONIKI, SOIL SCI LAB, GR-54006 THESSALONIKI, GREECE

来源：

CLAYS AND CLAY MINERALS | 1995年 / 43卷 / 01期

关键词：

ALUMINUM HYDROXIDES; PSEUDOBOEHMITE; SULFATES;

D O I：

10.1346/CCMN.1995.0430113

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of different ions in the formation of Al(OH)(3) polymorphs has been studied experimentally by promoting stoichiometric reactions between the aluminum salts (AlCl3, Al(NO3)(3), Al-2(SO4)(3)) and bases (NaOH, KOH, NH4OH). In all cases the polymorphs obtained were a mixture of gibbsite, bayerite and nordstrandite or pseudoboehmite with the exception of the reaction between KOH, or NH4OH and Al-2(SO4)(3) which produced amorphous gels. Ageing of these gels at ambient temperature and pressure for 180 days or at 60 degrees C for 20 days resulted in crystalline structure. Specifically, pseudoboehmite was crystallized from the reaction between Al-2(SO4)(3) and NH4OH. Significantly, of all ions present in solution in the present experiment, only the sulphate ones were observed to have a marked influence in the precipitation of Al oxyhydroxides.

引用

页码：111 / 115

页数：5

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