Cryolite(Sodium Fluoaluminate, Aluminium Sodium Fluoride)
[Molecular Formula] Na3AlF6
[Molecular Weight] 209.94
[Properties]
Clorless monocrystal crystal, usually appears offwhite, pink, yellowish or black because of impurity, usually present as indiscerptible compact block with glass lustre, specific gravity: 2.9-3.0, melting point: 1000°C; slight soluble in water, aqueous solution is acidic, decompose to toxic hydrogen fluoride gas when meeting with sulfuric acid.
[Uses]
It is mainly used as fluxing agent in aluminum production, insecticide for crops, melting agent and opaquefier for enamel glaze; also used to produce opal glass and as electrolyte in producing aluminum alloy, iron alloy and boiling steel; as ingredient of grindstone and as raw material in dip coating of aluminum on iron and steel.
[Quality Index] Standard: GB 4291-84
Item |
Index |
Note |
Excellent Grade |
First Grade |
Second Grade |
1. the content is based on dry base;
2. usually, the molecular ratio of NaF to AlF3 is 2 to 1; if the other requirement is needed, please declare in contract;
3. cryolite is white powder .
4. the agglomeration larger than 4mm in diameter is allowable, but the weight is not heavier than 5%. |
F£¬%≥ |
53 |
53 |
53 |
Al, %≥ |
13 |
13 |
13 |
Na, %≤ |
31 |
31 |
31 |
SiO2+Fe2O3, %≤ |
0.25 |
0.4 |
0.5 |
Sulfate(SO4), %≤ |
0.88 |
1.2 |
1.5 |
P2O5, % ≤ |
0.02 |
0.05 |
0.05 |
H2O,% ≤ |
0.5 |
0.8 |
1.3 |
[Package] plastic barrel, net weight: 25kg/barrel
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