ISO 11256:2015 PDF

Name: ISO 11256:2015 — Iron ore pellets for shaft direct-reduction feedstocks — Determination of the clustering index
SKU: ISO 11256:2015
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Iron ore pellets for shaft direct-reduction feedstocks — Determination of the clustering index

Название (английский):

ISO 11256:2015

Iron ore pellets for shaft direct-reduction feedstocks — Determination of the clustering index

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 13
Дата публикации:: 4 августа 2015 г.
Издание:: ISO IS 11256 edition 3 version 1
ICS:: 73.060.10

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Описание (английский):

ISO 11256:2015 specifies a method to provide a relative measure for evaluating the formation of clusters of iron ore pellets when reduced under conditions resembling those prevailing in shaft direct-reduction processes. ISO 11256:2015 is applicable to hot-bonded pellets.

Abstract

Overview

Key topics and technical requirements

Scope: Applicable to hot‑bonded iron ore pellets used in shaft direct‑reduction feedstocks. Test results are intended for quality control, contractual specification and research.
Principle: Isothermal reduction of a fixed bed of pellets to 95% degree of reduction, followed by controlled disaggregation in a tumble drum; the clustering index is the mass fraction of material remaining in clusters after disaggregation.
Sample and test portions:
- Representative sample per ISO 3082; sized pellets (typical size fractions described in the standard).
- Test portions: at least five portions ≈ 2 000 g each; one reserved for chemical analysis.
Test atmosphere and gas control:
- Reducing gas composed of CO, CO2, H2 and N2 with specified volume fractions (document specifies approx. 30% CO, 15% CO2, 45% H2, 10% N2) and strict impurity limits.
- Reducing gas flow typically maintained at 40 L/min (reference conditions) with specified preheating and nitrogen for heating/cooling.
Temperature and loading:
- Entire test portion held at 850 °C ± 5 °C.
- Static load applied after initial reduction: 147 kPa ± 2 kPa (via ram and porcelain ball bed).
Apparatus essentials:
- Reduction tube assembly with perforated support plate, furnace with balance, gas supply and flow control, tumble drum (1 000 mm diameter × 500 mm length) rotated at ~25 r/min, weighing equipment.
Result expression:
- Calculation of the Clustering Index (CI) as mass of clustered material after defined tumbler cycles; procedures for repeatability, acceptance and reporting are included.

Practical applications and users

Steelmakers and direct‑reduction plant operators: assess pellet behaviour in shaft reactors and anticipate handling/operational issues.
Pellet producers and metallurgical QA/QC teams: specify product quality, ensure consistency and support commercial contracts.
Test laboratories and R&D groups: compare pellet formulations, bonding methods, and process adjustments with a standardized, reproducible metric.
Engineering consultancies evaluating feedstock suitability for DRI (direct reduced iron) processes.

Related standards

ISO 3082 - Sampling and sample preparation for iron ores
ISO 2597-1 / 2597-2 - Determination of total iron content
ISO 9035 - Acid‑soluble iron(II) determination
ISO 11323 - Vocabulary for iron ore and direct reduced iron

Keywords: ISO 11256:2015, clustering index, iron ore pellets, shaft direct‑reduction, hot‑bonded pellets, tumble drum, reducing gas, pellet quality, DRI feedstock.

Технические детали

Технический комитет: ISO/TC 102/SC 3 - Physical testing
SKU: ISO 11256:2015

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