Formation of X-ray amorphous and crystalline aluminium hydroxides

DOI Web Site 被引用文献4件

書誌事項

公開日
1964-03
権利情報
  • https://www.cambridge.org/core/terms
DOI
  • 10.1180/minmag.1964.033.264.04
公開者
Mineralogical Society

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説明

<jats:title>Summary</jats:title><jats:p>Various crystalline and X-ray amorphous forms of aluminium hydroxide prepared from sulphate and chloride solutions by varying the mole ratio of NaOH to Al<jats:sup>3+</jats:sup> have been characterized by chemical analysis and X-ray diffraction. When the NaOH/Al ratio is 3 or 3·3, crystalline Al(OH)<jats:sub>3</jats:sub> in the form of bayerite, nordstrandite, gibbsite, or mixtures is obtained in several hours. When the ratio is 2·75 or below, no Al(OH)<jats:sub>3</jats:sub> is evident and the products are X-ray amorphous and remain so even after ageing for six months. Chemical analysis indicates that the amorphous precipitates are basic aluminium sulphates or chlorides. In the 0 to 2·1 range of NaOH/Al, the composition of the products is constant, being approximately Al(OH)<jats:sub>2·2</jats:sub><jats:italic>X</jats:italic><jats:sub>0·8</jats:sub>. In the 2·1 to 2·75 range, a continuous series of basic salts, of composition ranging from Al(OH)<jats:sub>2·2</jats:sub><jats:italic>X</jats:italic><jats:sub>0·8</jats:sub> to Al(OH)<jats:sub>2·75</jats:sub><jats:italic>X</jats:italic><jats:sub>0·25</jats:sub>, is obtained.</jats:p>

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