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Dicalcium phosphate dihydrate
- Chemical
formula CaHPO4.2H2O
- Identification
.....CAS/EINECS
NO: 7789-77-7 / 231-826-1
- Process
The most common
production process used for obtaining
..dicalcium
phosphate dihydrate is dissolving either rock phosphate
..or bones in hydrochloric
acid, purification and precipitation in
..crystals. Under
very precise and controlled process parameters
..Dicalcium phosphate
dihydrate can also be produced from purified
..feed grade phosphoric
acid with a calcium source. The grade of
..hydration can
be checked by means of X-ray diffraction analysis or
..by the thermo-gravimetric
method.
- Chemical
characteristics (typical)
|
Total phosphorus |
17
- 18% |
|
Soluble phosphorus: |
|
|
in
2% citric acid |
95% |
|
in
alk. amm. citrate |
95% |
|
Calcium |
23
- 25% |
|
Ca : P
ratio |
1.3
: 1 |
pH (1% solution)
|
5
- 7.5
|
|
Ash insoluble in HCl |
0,4
- 1,4 % |
|
Moisture |
1% - 2% |
|
Undesirable
substances |
conformto
the European Directives |
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- Physical
properties (typical)
| Appearance |
fine
powder
colour white |
| Apparent
density |
loose 0.6 - 0.9 kg dm-3
tapped 0.9 - 1.1 kg dm-3 |
-
Handling, storage, toxicity
| Handling |
avoid
dust formation |
| Storage |
store
in dry place |
| Shelf-life |
minimum
3 years |
| Toxicity |
non
toxic |
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