BS 7020 is a series on the analysis of iron ores. Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red. BS 7020-7.2 specifies a combustion method for the determination of the sulfur content of iron ores.
This method is applicable to a concentration range of 0,002 to 0,25 % (m/m) of sulfur in natural iron ores, iron ore concentrates and agglomerates including sinter products. The results are not affected by the presence of fluoride.
BS 7020-7.2 on the determination of the sulfur content of iron ores is useful for:
Ores containing very high quantities of hematite or magnetite (greater than about 60% iron) are known as "natural ore" or "direct shipping ore", meaning they can be fed directly into iron-making blast furnaces. Mixing of the sample with tungstic oxide and heating at 1 200 °C in a resistance furnace, using nitrogen as a carrier gas. Absorption of the evolved sulfur dioxide in a dilute hydrochloric acid solution containing starch and potassium iodide, and titration of the solution continuously during the evolution with a standard volumetric solution of potassium iodate.
The test report includes the information that consists of a reference to BS 7020-7.2, details necessary for the identification of the sample, the result of the analysis, the reference number of the result and any characteristics noticed during the determination, and any operations not specified in BS 7020-7.2 which may have had an influence on the result, either for the test sample or the certified reference material(s). Using BS 7020-7.2 you can specify a combustion method for the determination of the sulfur content of iron ores.
ISO 4690:1986