Process for preparing compacted pigment granules, process for preparing encapsulated pigment granules, and process for dyeing landscaping and/or construction materials
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United States of America Patent
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Nov 27, 2012
Grant Date -
Oct 2, 2008
app pub date -
Nov 15, 2007
filing date -
Jul 21, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A process for preparing compacted pigment granules, comprising the steps of (1) loading iron oxide powder into a rotating mixer; (2) spraying, while the mixer is rotating, liquid binder solution onto the cascading pigment powder, whereby the cascading pigment powder is compacted into dense granules of approximately 0.3-1.2 mm diameter and having a moisture content of approximately 10-14%; and (3) directing, while the mixer is rotating, heated air at a temperature of 200-600° C. onto the compacted pigment granules, so that the compacted pigment granules are dried at a temperature of approximately 50-100° C., and continuing this process for approximately 2-3 hours until the moisture content of the compacted pigment granules is reduced to approximately 2% or less, whereupon the compacted pigment granules are removed from the mixer, and a process for preparing encapsulated pigment granules.
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Cited Art Landscape
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