Standard No.:	GB/T 6730.61-2005
Chinese Name:	铁矿石碳和硫含量的测定高频燃烧红外吸收法
English Name:	Iron ores—Determination of carbon and sulfur content—High frequency combustion with infrared absorption method
Professional Classification:	D31 Iron ore
Professional Classification:	GB National Standard
ICS Classification:	73.060.10 Iron ores
Issued by:
Issued on:	2005-07-21
Implemented on:	2006-01-01
Status:	VALID
Language:	English
File Format:	PDF
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1 Scope

This Standard specifies the determination of carbon and sulfur content in the iron ores by high frequency combustion with infrared absorption method.
This Standard is applicable to the determination of carbon and sulfur content in the natural iron ore, iron ore concentrate, sinter, pellet and their products, with the determination scope (mass fraction) of 0.01%~2.5% for the carbon and 0.001%~2.0%" for the sulfur.

2 Normative References

The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding corrigendum), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this Standard are encouraged to study whether the latest editions of these documents apply. For undated references, the latest editions apply.
GB/T 6379-1986 Precision of Test Methods - Determination of Repeatability and Reproducibility for a Standard Test Method by Interlaboratory Tests (GB/T 6379-1986, neq ISO 5725: 1986)
GB/T 6682 Water for Laboratory Use - Specifications (GB/T 6682-1992, neq ISO 3697: 1987)
GB/T 6730.1 Methods for Chemical Analysis of Iron Ores - Preparation of Predried Test Samples for Chemical Analysis (GB/T 6730.1-1986, eqv ISO 7764: 1985)
GB/T 10322.1 Iron Ores - Sampling and Sample Preparation Procedures (GB/T 10322.1-2000, idt ISO 3082: 1998)
GB/T 12806 Laboratory Glassware - One-mark Volumetric Flask (GB/T 12806-1991, neq ISO 1042: 11983)
GB/T 12808 Laboratory Glassware - One-mark Pipette (GB/T 12808-1991, neq ISO 648: 1977)

3 Method Summary

The sample is heated and combusted in the oxygen flow of the high frequency furnace, the generated carbon dioxide (or carbon monoxide) and sulfur dioxide are carried by the oxygen to the measuring chamber of the infrared analyzer, the carbon dioxide (or carbon monoxide) and sulfur dioxide absorb certain specific wavelength of the infrared energy, their absorbed energy is proportional to their concentration, the carbon and sulfur content may be measured according to changes of the energy received by the detector.