Process for bleaching and increasing the ion-exchange capability of sepiolite
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United States of America Patent
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Sep 24, 1991
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N/A
app pub date -
Jul 1, 1988
filing date -
Jul 1, 1987
priority date (Note) -
Expired
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Abstract
The present invention refers to a process for bleaching and increasing the ion-exchange capability of the sepiolite mineral, basically consisting of treating, at high pH and temperature, the sepiolite with a basic salt solution, which results in bleaching the starting material by dissolution of the organic material present in it, and in increasing the ion-exchange capability by a structural transformation of sepiolite. The bleaching can be optionally completed with a reduction treatment with sodium dithionite or with other reducing agents capable of reducing Fe.sup.3+ to Fe.sup.2+.
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