ISO/TR 9686:2017 PDF

Name: ISO/TR 9686:2017 — Direct reduced iron — Determination of carbon and/or sulfur — High-frequency combustion method with infrared measurement
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Direct reduced iron — Determination of carbon and/or sulfur — High-frequency combustion method with infrared measurement

Название (английский):

ISO/TR 9686:2017

Direct reduced iron — Determination of carbon and/or sulfur — High-frequency combustion method with infrared measurement

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 17 мая 2017 г.
Издание:: ISO TR 9686 edition 1 version 1
ICS:: 73.060.10

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Описание (английский):

ISO/TR 9686:2017 specifies a method for the determination of the mass fraction of carbon and/or sulfur in direct reduced iron by infrared measurement after high-frequency combustion. This method is applicable to mass fractions of carbon between 0,05 % and 2,5 %, and/or mass fractions of sulfur between 0,001 % and 0,05 % in direct reduced iron.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview - ISO/TR 9686:2017 (Direct reduced iron, HF combustion + IR)

ISO/TR 9686:2017 specifies a laboratory method for the determination of carbon and/or sulfur mass fractions in direct reduced iron (DRI) using high-frequency (HF) combustion followed by infrared (IR) measurement of CO2 and SO2. The method applies to carbon levels from 0.05 % to 2.5 % and sulfur levels from 0.001 % to 0.05 %. It describes sample preparation, reagents, crucible preparation, calibration, blank tests and instrument operation for commercial HF combustion/IR analyzers.

Key topics and technical requirements

Principle: Combustion of a weighed test portion in oxygen in a refractory crucible within an HF furnace; CO2 and SO2 measured by IR absorption.

Scope limits: Carbon 0.05–2.5 % (mass fraction); sulfur 0.001–0.05 % (mass fraction).

Sample: Laboratory sample milled to −160 µm and predried at 105 °C ± 2 °C (per ISO 10835 / ISO 7764). Typical test portion: 0.400 g.

Reagents & materials: Oxygen (≥ 99.5 %), magnesium perchlorate, ascarite (for C), tungsten accelerator (low C/S content), tin capsules, barium carbonate for carbon calibration and potassium sulfate standard solutions for sulfur calibration.

Crucibles: Ceramic combustion crucibles must be pre‑ignited (≥ 1 350 °C for general use; 1 100 °C if only sulfur is determined) and precisely dimensioned for the instrument.

Calibration & blanks: Multi-point calibration using prepared standards (BaCO3 for carbon; K2SO4 solutions for sulfur). At least three blank burns are recommended to establish zero adjustment.

Instrumentation & operation: Uses commercial HF combustion/infrared sulfur analysers; follow manufacturer instructions for oxygen flow (typically ~2.0 L/min during combustion), filter maintenance and stabilization.

Safety: Addresses combustion hazards, oxygen handling and high-frequency radiation screening.

Applications and users

ISO/TR 9686:2017 is intended for:

Steelmakers, iron producers and DRI manufacturing labs monitoring carbon and sulfur content for process control and product specification.

Quality control and metallurgical laboratories performing routine compositional analysis of direct reduced iron.

Equipment manufacturers and analytical service providers implementing or validating HF combustion + IR analyzers for DRI.

Practical benefits include fast, direct measurement of C and S in DRI, clear calibration procedures, and guidance on sample preparation and instrument setup.

Related standards and annex material

Related ISO references cited for sampling and glassware: ISO 10835, ISO 7764, ISO 7550, ISO 1042.

Annexes provide crucible loading sequences, calibration flowsheets, features of commercial analyzers, repeatability/tolerance derivations and international precision data.

Note: ISO/TR 9686:2017 replaces ISO 9686:2006 and is published as a Technical Report (not a referee method).

Keywords: ISO/TR 9686:2017, direct reduced iron, HF combustion, infrared measurement, carbon determination, sulfur determination, DRI analysis, barium carbonate calibration, potassium sulfate standard.

ISO/TR 9686:2017 PDF

Abstract

Похожие стандарты

Overview - ISO/TR 9686:2017 (Direct reduced iron, HF combustion + IR)

Key topics and technical requirements

Applications and users

Related standards and annex material

Технические детали

ISO 9686:2006

Direct reduced iron — Determination of carbon and/or sulfur — High-frequency combustion method with infrared…

ISO 10835:1995

Direct reduced iron — Sampling and sample preparation — Manual methods for reduced pellets and lump ores

ISO 7764:1985

Iron ores — Preparation of predried test samples for chemical analysis

SIST ISO 7550:1995

Laboratory glassware -- Disposable micropipettes

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