Activated clay particles having similar shapes, method for production thereof and use thereof
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United States of America Patent
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Aug 5, 2003
Grant Date -
N/A
app pub date -
Mar 13, 2001
filing date -
Jun 1, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Activated regular-shaped clay particles forming macropores therein, preserving fine structure of the dioctahedral smectite clay minerals, and having particle diameters controlled to lie within a range in which they exhibit excellent filtering property. The invention further provides method of producing activated regular-shaped clay particles comprising the steps of adjusting the particle size of the dioctahedral smectite clay minerals to possess a volume-based median diameter (D.sub.50) of from 1 to 10 .mu.m as found by a laser diffraction method, mixing an acid-soluble or acid-decomposing inorganic compound to the milled product thereof, granulating the mixture into regular particles having a volume-based median diameter (D.sub.50) of from 10 to 60 .mu.m as found by a laser diffraction method, and treating the regular-shaped particles with an acid while maintaining the particle shapes.
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