ISO 4696-1:2015

Name: ISO 4696-1:2015 — Iron ores for blast furnace feedstocks — Determination of low-temperature reduction-disintegration indices by static method — Part 1: Reduction with CO, CO2, H2 and N2
SKU: ISO 4696-1:2015
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Iron ores for blast furnace feedstocks — Determination of low-temperature reduction-disintegration indices by static method — Part 1: Reduction with CO, CO2, H2 and N2

Название (английский):

ISO 4696-1:2015

Iron ores for blast furnace feedstocks — Determination of low-temperature reduction-disintegration indices by static method — Part 1: Reduction with CO, CO2, H2 and N2

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 20 августа 2015 г.
Издание:: ISO IS 4696 edition 3 version 1
ICS:: 73.060.10

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Описание (английский):

ISO 4696-1:2015 specifies a method to provide a relative measure for evaluating the degree of size degradation of iron ores when reduced with carbon monoxide, carbon dioxide, hydrogen, and nitrogen, under conditions resembling those prevailing in the low-temperature reduction zone of a blast furnace. ISO 4696-1:2015 is applicable to lump ores, sinters, and hot-bonded pellets.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4696-1:2015 specifies a static laboratory method to determine low-temperature reduction‑disintegration indices (RDI) of iron ores for blast furnace feedstocks. The standard provides a relative measure of the degree of size degradation (disintegration) that lump ores, sinters, and hot‑bonded pellets experience when reduced under conditions similar to the low‑temperature reduction zone of a blast furnace. Results support quality control, contract specifications and research into blast furnace feed behaviour.

Key Topics and Requirements

Test principle: Isothermal reduction at 500 °C ± 5 °C for 60 minutes in a fixed bed followed by mechanical tumbling and sieving to calculate RDI values.

RDI indices: Mass percentages reported for:

material > 6.30 mm,
material < 3.15 mm,
material < 500 µm.

Reducing gas composition: CO 20.0% ± 0.5%, CO2 20.0% ± 0.5%, H2 2.0% ± 0.5%, N2 58.0% ± 0.5%; impurities limited (e.g., O2 ≤ 0.1%).

Gas flow rates: Reducing gas at 20 L/min ± 1 L/min; heating/cooling N2 flows specified (e.g., 5 L/min during heating, increased to 20 L/min for equilibration).

Sample preparation: Size fraction −12.5 mm +10.0 mm, oven‑dry to constant mass; minimum test sample 2 kg dry basis; prepare at least four test portions ~500 g each.

Apparatus and procedure: Reduction tube with perforated support plate, furnace, tumble drum (300 revolutions at ~30 r/min), and sieves conforming to ISO 3310. Weighing accuracy 0.1 g.

Safety: CO and reducing gases are toxic - work in well‑ventilated or hooded areas and follow local safety regulations.

Applications - Who Uses ISO 4696-1:2015

Steel producers and blast furnace operators use RDI data to assess feedstock stability during low‑temperature reduction and to optimize burden blend.

Iron ore producers and traders include RDI in product specifications and contracts to demonstrate handling and reduction behaviour.

Metallurgical laboratories and QA/QC teams apply the method for routine quality control and comparative testing across lots.

Researchers studying ore reducibility, disintegration mechanisms, and sinter/pellet performance in BF process development.

Related Standards

ISO 3082 - Sampling and sample preparation for iron ores

ISO 3310‑1 / ISO 3310‑2 - Test sieves (metal wire cloth / perforated plate)

ISO 11323 - Iron ore vocabulary

ISO 4696‑2 - Part 2: Reduction with CO and N2

Keywords: ISO 4696-1:2015, iron ores, blast furnace feedstocks, reduction‑disintegration indices, RDI, low‑temperature reduction, CO, CO2, H2, N2, lump ores, sinter, pellets, static method.

ISO 4696-1:2015

Abstract

Похожие стандарты

Overview

Key Topics and Requirements

Applications - Who Uses ISO 4696-1:2015

Related Standards

Технические детали

BS ISO 3310-2:2013

Test sieves. Technical requirements and testing. Test sieves of perforated metal plate.

BS ISO 3082:2017

Iron ores. Sampling and sample preparation procedures.

BS ISO 3310-1:2016

Test sieves. Technical requirements and testing. Test sieves of metal wire cloth.

BS ISO 11323:2010

Iron ore and direct reduced iron. Vocabulary.

ISO 4696-2:2015

Iron ores for blast furnace feedstocks — Determination of low-temperature reduction-disintegration indices by…