Iron ores Determination of silicon content Part 2: Reduced molybdosilicate spectrophotometric method

Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

10-12-1992

Publisher

International Organization for Standardization

The method is based on decomposition of the test portion by fusion with sodium tetraborate and treatment with dilute nitric acid, addition of ammonium molybdate to convert silicate into a molybdatosilicate complex, reduction to molybdenum blue with ascorbic acid, and spectrophotometric measurement of the absorbance of the molybdenum blue complex at a wavelength of approximately 600 nm. Applies to silicon contents between 0,1 % and 5,0 % in natural iron ores, iron ore concentrates and agglomerates, including sinter products, especially for ores containing fluorine.

DevelopmentNote	Supersedes ISO 4686 (04/2001) Also numbered as BS 7020-5.2(1993). (04/2005)
DocumentType	Standard
Pages	8
PublisherName	International Organization for Standardization
Status	Current
Supersedes	ISO 4686:1980

Standards	Relationship
SS-ISO 2598-2:2018	Identical

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ISO 7764:2006	Iron ores Preparation of predried test samples for chemical analysis
ISO 3083:1986	Iron ores — Preparation of samples — Manual method
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