ISO 9035:1989

Name: ISO 9035:1989 — Iron ores — Determination of acid-soluble iron(II) content — Titrimetric method
SKU: ISO 9035:1989
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Iron ores — Determination of acid-soluble iron(II) content — Titrimetric method

Название (английский):

ISO 9035:1989

Iron ores — Determination of acid-soluble iron(II) content — Titrimetric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 17 августа 1989 г.
Издание:: ISO IS 9035 edition 1 version 1
ICS:: 73.060.10

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Описание (английский):

Is applicable to natural and processed iron ores containing from 1 % to 25 % acid-soluble iron(II) and only traces of metallic iron. Is limited for use in conjunction with the reducibility test methods. Is not applicable to ores containing more than 0,3 % (m/m) sulfur (as sulfide) and/or 5 % free carbon. Specifies principle, reagents, apparatus, sampling and samples, procedure, expression of results and test report. Includes three annexes.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 9035:1989 specifies a titrimetric method for determining the acid‑soluble iron(II) content in natural and processed iron ores. The method applies to ores containing 1 % to 25 % acid‑soluble Fe(II) and only traces of metallic iron. It is intended for use in conjunction with reducibility test methods (ISO 4695 / ISO 7215) and includes procedural details, precision data and three annexes (flowchart, derivation of precision and trial data).

Key topics and technical requirements

Scope limits

Applicable to ores with 1–25 % acid‑soluble Fe(II).
Not applicable when sulfide sulfur > 0.3 % (m/m) or free carbon > 5 % (m/m).

Principle

Dissolution of the predried sample in hydrochloric acid under an inert atmosphere or with CO3/CO3– trapping of evolved gases.
Addition of a sulfuric–phosphoric acid mixture, dilution and titration of Fe(II) with potassium dichromate (standard solution; c ≈ 0.01667 mol/L).
Endpoint indicated by sodium diphenylaminesulfonate (indicator).

Reagents and apparatus (selected)

Hydrochloric, sulfuric, phosphoric acids; hydrofluoric acid optional for high‑silica ores.
Sodium carbonate / sodium hydrogen carbonate for neutralization/trapping.
Gockel safety trap or inert‑gas feed (nitrogen/argon), class B burette (ISO 385‑1), 500 ml conical flask.
Standard dichromate solution preparation (e.g., dissolve 4.904 g K2Cr2O7 and dilute to 1 000 ml).

Sample preparation

Crush/pulverize to minus 100 µm (or minus 160 µm for ores with combined water/oxidizable compounds).
Predry at 105 °C ± 2 °C (per ISO 7764).
Typical decomposition at ~90 °C; decomposition time normally ~30 min (max 60 min).

Quality control & precision

Run analyses in duplicate; validate with a certified reference material analyzed in parallel.
Temperature correction for dichromate titre: ~0.02 % relative per 1 °C difference.
Precision quantified by repeatability and reproducibility regression equations; annexes provide trial data and statistical background.

Applications and users

This standard is relevant for:

Metallurgical and analytical laboratories performing iron ores analysis.

Mining companies and QA/QC teams monitoring ore chemistry for processing and reducibility testing.

Research groups and process engineers linking Fe(II) content to reduction behavior and pellet/feedstock characterization. Practical uses include routine chemical quality control, verification of reagent preparation, and validating reducibility test protocols.

Related standards

ISO 4695, ISO 7215 - reducibility test methods (use in conjunction).

ISO 7764 - sample preparation for chemical analysis.

ISO 385‑1, ISO 4791‑1 - laboratory apparatus vocabulary/requirements.

ISO 5725 - statistical treatment of precision data.

Keywords: ISO 9035, acid‑soluble iron(II), titrimetric method, potassium dichromate titration, iron ores analysis, reducibility tests, sampling, certified reference material.

ISO 9035:1989

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

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