Attapulgite

28 Oct.,2024

 

Attapulgite

Attapulgite differs from other clays in a variety of ways. For example, unlike gels made with bentonite clay, gels made with attapulgite remain stable in the presence of salts and other additives. It has the ability to form stable gels in the presence of salts and other additives.

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This means that attapulgite retains its thickening properties in complex formulations used in applications such as paints, stuccos, and pharmaceuticals. For the same reason, attapulgite is the clay of choice for drilling in salt-contaminated oil and gas formations.

In terms of sorbent properties, attapulgite excels over all other clays as a clarification agent for the edible oils industry. The ability of attapulgite to purify is enhanced by thermal treatment to temperatures over 200°C where it develops a surface acidity optimal for mild but effective oil contaminant removal.

With an emphasis on R&D, the unique properties of attapulgite are fully exploited by Geohellas in existing and new applications and products. Our flexibility in production and extensive reserves make Geohellas the one-and-only European source of attapulgite for a broad range of industry and consumer markets.

Comparing attapulgite and sepiolite

"Analysis shows that the attapulgite clay, in both liquid and powdered form, produced a liquid feed mixture with better viscosity and greater stability than the sepiolite powder."




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"We conducted a series of lab tests to study the performance of liquid and powder attapulgite and sepiolite powder in a liquid feed formulation (see table Liquid feed composition). We measured stability at 24 hours, three days and seven days.

We used a Brookfield viscometer in the first study to take two separate rheological measurements. The 10-rotation per minute (rpm) viscometer measurement represents the viscosity of the feed mixture at rest. The 100-rpm viscometer measurement represents the viscosity of the feed mixture as it is being pumped.

As a rule of thumb, a 10-rpm viscometer reading range of 3,000-13,000 centipoise (cps) indicates that the liquid feed mixture has good at-rest stability. For the 100-rpm viscometer readings, a range of 900-1,300 cps indicates that the feed mixture has good flowability and pumpability.

The attapulgite performance was then evaluated against that of the sepiolite clay additives. Analysis of the seven-day test data for the viscosity index shows that the attapulgite clay, in both liquid and powdered form, produced a liquid feed mixture with better viscosity and greater stability than the sepiolite powder. These rankings held true for both the 10- and 100-rpm viscometer readings.

Syneresis results when density or chemistry differences cause the components that were temporarily co-mingled in a mixed formulation to separate. We geared the second study to measure syneresis control. We took measurements at the seven-day storage period. No syneresis occurred in the mix containing liquid attapulgite clay (see figure Syneresis of various mixtures after seven days). About 2% syneresis occurred in the dry attapulgite clay mixture and about 4% occurred in the sepiolite mixture. This finding indicates that attapulgite is an efficient suspending agent for liquid animal feed mixtures. "

EXCERPT FROM LIQUID FEED: OPTIMIZE YOUR MIX, BY JOHN WOLFORD. PUBLISHED BY FEED MANAGEMENT, JULY/AUGUST , VOLUME 54, NUMBER 6

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