|
|
Aldrich
Diatomaceous Earth
|
|
|
|
IV. DIATOMACEOUS EARTH
|
|
Known by a variety of tradenames, diatomaceous-earth products find common use as filter agents and all-purpose adsorbents, as well as in specialized applications, such as catalyst carriers. These products, also known as diatomaceous silicas, are powders generally having a silicon dioxide assay of about 90%.
The CAFA (Celite® Analytical Filter Aid) product is double-acid-washed to remove trace metal oxides and contains about 97.5% SiO2. It is useful as an analytical filter agent and for high-purity applications.
Celite 521 is acid-washed and contains about 94% SiO2. It is suitable for use where exceptional purity is desired.
The Celatom® products are flux-calcined, with a pH (10% slurry) of 8.0-9.5, and specific gravity of 2.33.
|
| Table 7 |
| Catalog No. |
16,743-6 |
22,179-1 |
24,331-0 |
24,332-9 |
24,333-7 |
24,334-5 |
| Grade |
CAFA |
Celite |
Celatom
FW-14 |
Celatom
FW-50 |
Celatom
FW-60 |
Celatom
FW-80 |
| Flow rate |
100 |
200 |
700 |
2500 |
3000 |
5500 |
| Median size (µ) |
2.5 |
3.5 |
— |
— |
— |
— |
| Clarity |
1000 |
500 |
969 |
940 |
936 |
927 |
| Acid-soluble iron (ppm) |
60 |
15 |
— |
— |
— |
— |
Wet density
(lb/cu ft) |
17 |
19-90 |
19 |
18 |
18 |
17 |
| Avg. particle size (µ) |
7.5 |
14 |
8 |
15 |
19 |
23 |
| Moisture (%) |
1 |
0.5 |
— |
— |
— |
— |
| Color |
white-grey/ pink |
light-pink
to tan |
white |
white |
white |
white |
Celite is a registered trademark of JohnsManville Corp.
Celatom is a registered trademark of EaglePicher Industries, Inc. |
|
