ISO 4277:1977

Withdrawn

Cryolite, natural and artificial Conventional test for evaluation of free fluorides content

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Withdrawn date

16-02-2019

Language(s)

English, French

Published date

01-11-1977

Publisher

International Organization for Standardization

Applicable to products having contents of AlF3 of more than 0.15 % (m/m) or of NaF of more than 0.4 % (m/m). Covers sintering of a test portion with a known quantity of sodium fluoride in a muffle furnace at a temperature of (790 10) C. Under these conditions, aluminium fluoride in excess of that required by the stoichiometric formula AlF3 .3NaF reacts to form cryolite; extraction of the ground sintered mass with boiling water. Acidification with hydrochloric acid solution to a pH less than 3.7 and titration of the excess sodium fluoride with thorium nitrate solution in the presence of alizarin-S as indicator. Has also been approved by the IUPAC.

DocumentType	Standard
Pages	3
PublisherName	International Organization for Standardization
Status	Withdrawn

Standards	Relationship
NBN T 03 445 : 1983	Identical

BS 4993-5:1980	Methods of test for aluminium fluoride for industrial use Determination of moisture content (Karl Fischer method)
BS 4993-9:1980	Methods of test for aluminium fluoride for industrial use Determination of sulphur content (X-ray fluorescence spectrometric method)
BS 5050-11(1980) : 1980	METHODS OF TEST FOR CRYOLITE - DETERMINATION OF SULPHATE CONTENT
BS 5050-9(1980) : 1980	METHODS OF TEST FOR CRYOLITE - DETERMINATION OF MOISTURE CONTENT (KARL FISHER METHOD)
ISO/TR 4277:2009	Cryolite, natural and artificial Conventional test for evaluation of free fluorides content
BS 4993-8:1980	Methods of test for aluminium fluoride for industrial use Determination of sulphate content
BS 5050-13(1983) : 1983	METHODS OF TEST FOR CRYOLITE - DETERMINATION OF PHOSPHORUS CONTENT
BS 5050-10(1980) : 1980	METHODS OF TEST FOR CRYOLITE - DETERMINATION OF MOISTURE CONTENT (GRAVIMETRIC METHOD)
BS 5050-12(1980) : 1980	METHODS OF TEST FOR CRYOLITE - DETERMINATION OF SULFUR CONTENT (X-RAY FLUORESCENCE SPECTROMETRIC METHOD)
BS 4993-10:1983	Methods of test for aluminium fluoride for industrial use Determination of phosphorus content
PD ISO/TR 4277:2009	Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content
BS 4993-6:1980	Methods of test for aluminium fluoride for industrial use Determination of moisture content (gravimetric method)