The determination of calcium fluoride in acid-grade fluorspar and other types of fluorspar that can be rendered soluble using the process indicated in the test method is covered in ASTM E815 – 11. The values expressed in SI units are regarded as standard.
Scope:
Fluorspar is used as a flux in the steel and glass industries, as well as in the production of hydrofluoric acid. ASTM E815 – 11 is used to ensure that calcium fluoride content meets compositional criteria. All users of these techniques are expected to be qualified analysts capable of performing common laboratory procedures competently and safely.
Procedure
The fluorine is released by fuming after the sample is destroyed with nitric and perchloric acids. The calcium is titrated with standard EDTA solution after the residue is dissolved in dilute hydrochloric acid and the solution is made alkaline. After extracting the former with dilute acetic acid, calcium present as carbonate is measured in a separate sample using EDTA solution.
Specimen size
Milligrams of calcium (X) in the 50-mL volume
Titration (in millilitres) by 2C sample.
Data
Total calcium, % T=10VC/ab
Where
V = volume of titrant, mL,
C = calcium equivalent of EDTA solution, mg/mL,
a = milliliters of aliquot,
b = grams of sample used,
T = total calcium present
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