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Calcium fluoride(CAS No. 7789-75-5)

Calcium fluoride CaF2 (cas 7789-75-5) Molecular Structure

7789-75-5 Structure

Identification and Related Records

【Name】
Calcium fluoride
【CAS Registry number】
7789-75-5
【Synonyms】
calcium fluoride coating quality balzers
calcium fluoride 99,9 %
calcium fluoride anhydrous
Calcium fluoride 98%
Calciumfluorideprecipitated
Calciumfluoride2
Calciumfluoridepowderednaturalmineral1
Calciumfluoridewhitepowder
Calciumfluoridephosphorgrademicronwhitepowder
Fluorite powder
【EINECS(EC#)】
232-188-7
【Molecular Formula】
CaF2 (Products with the same molecular formula)
【Molecular Weight】
78.07
【Inchi】
InChI=1/Ca.2FH/h;2*1H/q+2;;/p-2
【InChIKey】
WUKWITHWXAAZEY-UHFFFAOYSA-L
【Canonical SMILES】
[F-].[F-].[Ca+2]
【MOL File】
7789-75-5.mol

Chemical and Physical Properties

【Appearance】
white powder or colourless crystals
【Density】
3.18
【Melting Point】
1402℃
【Boiling Point】
2500℃
【Refractive Index】
1.434
【Flash Point】
2500°C
【Water】
INSOLUBLE
【Solubilities】
INSOLUBLE
【Color/Form】
white
【Stability】
Stable. Incompatible with acids.
【HS Code】
28261900
【Storage temp】
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
【Spectral properties】
Index of refraction: 1.4338
【Computed Properties】
Molecular Weight:78.074806 [g/mol]
Molecular Formula:CaF2
H-Bond Donor:0
H-Bond Acceptor:2
Rotatable Bond Count:0
Exact Mass:77.959398
MonoIsotopic Mass:77.959398
Topological Polar Surface Area:0
Heavy Atom Count:3
Formal Charge:0
Complexity:2.8
Isotope Atom Count:0
Defined Atom Stereocenter Count:0
Undefined Atom Stereocenter Count:0
Defined Bond Stereocenter Count:0
Undefined Bond Stereocenter Count:0
Covalently-Bonded Unit Count:3

Safety and Handling

【Hazard Codes】
Xi:Irritant
【Risk Statements】
R36/37/38
【Safety Statements 】
S26;S37/39
【Hazard Note】

Irritant

【PackingGroup 】
Z01
【Sensitive】
Hygroscopic
【Transport】
3288
【Formulations/Preparations】
... THREE GRADES MOST COMMONLY USED IN INDUSTRY, METALLURGICAL GRADE CONTAINS 60% OR MORE CALCIUM FLUORIDE, CERAMIC GRADE 85-97% & ACID GRADE 97% OR MORE.
【Other Preventative Measures】
IN THE MINING OF FLUORSPAR, DUST CONTROL SHOULD BE ... ENFORCED, INCLUDING WET DRILLING, WATERING OF LOOSE ROCK, AND EXHAUST & GENERAL VENTILATION. WHEN HEATING FLUORSPAR, THERE IS ALSO THE HAZARD OF HYDROFLUORIC ACID BEING FORMED, AND THE RELEVANT SAFETY MEASURES SHOULD BE APPLIED.
SRP: Local exhaust ventilation should be applied wherever there is an incidence of point source emissions or dispersion of regulated contaminants in the work area. Ventilation control of the contaminant as close to its point of generation is both the most economical and safest method to minimize personnel exposure to airborne contaminants.
【Disposal Methods】
SRP: At the time of review, criteria for land treatment or burial (sanitary landfill) disposal practices are subject to significant revision. Prior to implementing land disposal of waste residue (including waste sludge), consult with environmental regulatory agencies for guidance on acceptable disposal practices.

Use and Manufacturing

【Use and Manufacturing】
Methods of Manufacturing

MILLING OF FLUORSPAR AND CONCENTRATION BY WASHING, HEAVY MEDIA SEPARATION, OR FLOTATION TO PRODUCE THREE GRADES: METALLURGICAL (ABOUT 80% CALCIUM FLUORIDE), CERAMIC (85-97%), & ACID (GREATER THAN 97%)
... From calcium carbonate plus hydrogen fluoride: O Ruff, Die Chemie des Fluors (Berlin, 1920) p 89; Emeleus in Fluorine Chemistry, Vol 1, JH Simons, ed (Academic Press, 1950) p 36; Kwasnik in Handbook of Preparative Inorg Chem, Vol 1, G Brauer, ed (Academic Press, New York, 2nd ed, 1963) p 233.
U.S. Exports

(1972) 2.51X10+9 GRAMS
(1975) 9.07X10+8 GRAMS
U.S. Imports

(1972) 1.07X10+12 GRAMS (ALL GRADES)
(1975) 9.53X10+11 GRAMS
U.S. import for 1991(214,350 tons), 1992(267,328 tons), 1993(255,293 tons)
U.S. Production

(1972) 2.27X10+11 GRAMS (FINISHED FLUORSPAR)
(1975) 1.20X10+11 GRAMS
U.S. Prod: 1990(63,500 tons), 1991(58,000 tons), 1992(51,000 tons)
Consumption Patterns

(FOR FLUORSPAR): 49% IN MFR OF HYDROFLUORIC ACID; 31% AS A FLUX FOR BASIC OXYGEN FURNACE STEELMAKING; 8% AS A FLUX IN ELECTRIC FURNACE STEELMAKING; 6.5% AS A FLUX IN OPEN HEARTH FURNACE STEELMAKING; 2.6% AS A FLUX IN MFR OF IRON & STEEL CASTINGS; 1% IN GLASS AND FIBERGLASS MFR; AND 1.9% FOR MISC USES (1973)
Apparent consumption in the U.S.: 1987(643,659 tons); 1988(723,804 tons); 1989(693,121 tons); 1990(566,885 tons); 1991(365,831 tons); 1992 (480,376 tons)
【Usage】

Main primary source of fluorine & its compd, in ferrous metallurgy as flux to incr fluidity of slag, synthetic fluorspar is used in optical industry (transmits uv rays), pure form used as catalyst in dehydration & dehydrogenations, used to fluoridate drinking water.

Biomedical Effects and Toxicity

【Biomedical Effects and Toxicity】
RATS EXPOSED DAILY TO 13 MG SHOWED GRADUAL INCR IN EXCRETION OF FLUORIDE FROM 2ND DAY AFTER TREATMENT. ON 1ST DAY FLUORIDE CONCN IN SERUM WAS 2 TIMES HIGHER THAN CONTROL. FLUORIDE LUNG CONCN WAS GREATER THAN OTHER ORGANS & LEVEL IN FEMUR & INCISORS WERE HIGHER THAN CONTROLS.
URINE FLUORIDE EXCRETION RANGED FROM 1.0 TO 9.6 MG F-/L (CONTROLS: 0.3-1.2) IN GROUP OF 50 WORKERS ENGAGED FOR APPROX 30 YR IN PHOSPHATE FERTILIZER PRODN. AMBIENT FLUORIDE (FLUORSPAR) CONCN RANGED FROM 0.15-0.62 MG/CU M & GASEOUS FLUORIDE RANGED FROM 0.04-0.17 MG/CU M.
Gas chromatography was used to measure the maternal and fetal plasma inorganic fluoride values at term in 91 women. They were assigned to one of four groups: group A were untreated controls; group B received a single daily dose of 1.5 mg of fluoride (as calcium fluoride) during the final trimester of pregnancy; group C was given a single dose of 1.5 mg of fluoride (as sodium fluoride) and group D was given 2 daily doses of fluoride (as sodium fluoride) totaling 1.5 mg. There was a significant difference between the cord plasma fluoride levels of the newborns in the untreated group (mean: 27.8 ug/L) and that of the combined supplemented groups B, C and D (mean: 58.3 ug/L). There was no difference between the average fluoride levels in the three supplemented groups. In 17 women, gestation time between 19 and 34 weeks, fluoride levels were measured in the mother (mean: 17.11 ug/L) and in the foetus by cord tapping (mean: 35.64 ug/L). In 4 other mothers, was given a dose of 1 mg of sodium fluoride; one hour later, mean cord fluoride level was 86.5 ug/L. These results indicate that placental transfer of fluoride occurs early during pregnancy and that supplementation during the final trimester of pregnancy will significantly elevate cord plasma fluoride concentrations.

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