Read e-book online Bauxites PDF

By Ida Valeton (Eds.)

ISBN-10: 0444408886

ISBN-13: 9780444408884

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Additional info for Bauxites

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26. , or greater total pressure. ) Bauxites may be supplied with S and CO, from polygenetic soil formation or overburden with lignites or peat bogs. Postdiagenetic minerals formed under fluctuating pH and Eh values are sulphides, sulphates and carbonates such as pyrite, marcasite, green vitriol, alunite, jarosite, gypsum, siderite and calcite. There is metasomatism or precipitation in joints and cavities. In bauxites of the Urals (BENESLAVSKY, 1963) the following zeolites occur: chabasite, phillipsite, ferrierite, heulandite, and harmotome.

When A13+is formed in solution which is slow, they quickly react with the surface conferring a divalent positive charge at the point of reaction and releasing H 3 0 + . 10). 10. The negative logarithm of the number of g-atoms of soluble aluminium per litre of solution (p AIM)in relation to the pH for various reactions taking place upon dissolution of aluminium hydroxide. The ionic species are indicated; curveA and Care for amorphoushydroxide, E and D for corundum, E for bayerite, and F for gibbsite surface.

This is followed by the slow disintegration of tetrahedrons, thus transforming montmorillonite into mixed layers of montmorillonite-kaolinite in a 1/1 proportion. Altschuler’s conception of the formation of defined mixed layers yielding 14-A reflexes from montmorillonite degradation by selective disintegration of tetrahedron layers seems to be more reasonable than the model of “chloritization” by the introduction of Al-hydroxide layers. The detailed process of degradation and transformation of the clay minerals remains to be clarified by future investigations.

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Bauxites by Ida Valeton (Eds.)


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