ISO 7335:1987 PDF

Name: ISO 7335:1987 — Iron ores — Determination of combined water content — Karl Fischer titrimetric method
SKU: ISO 7335:1987
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Iron ores — Determination of combined water content — Karl Fischer titrimetric method

Название (английский):

ISO 7335:1987

Iron ores — Determination of combined water content — Karl Fischer titrimetric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 17 декабря 1987 г.
Издание:: ISO IS 7335 edition 1 version 1
ICS:: 73.060.10

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Описание (английский):

This method ist applicable to a concentration range of 0,05 to 10 % (m/m) of combined water in natural iron ores, and iron ore concentrates and agglomerates including sinter products. The term combined water means that part of the water content of an iron ore that can be removed only at temperatures substantially higher than 100 to 110 °C. Figures show the general arrangement of the test apparatus for the Karl Fischer measurement, the heating tube, and the absorption cell. Includes three annexes.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7335:1987 - "Iron ores - Determination of combined water content - Karl Fischer titrimetric method" specifies a laboratory titrimetric procedure to determine combined water in natural iron ores, concentrates and agglomerates (including sinter). The method covers a measurement range of 0.05 to 10 % (m/m) combined water and defines combined water as the fraction that can be removed only at temperatures substantially higher than 100–110 °C. The standard includes illustrated apparatus arrangements (heating tube, absorption cell, titration cell) and three annexes with additional guidance.

Key topics and requirements

Scope and range: Applicable to iron ores, concentrates and sinter products with combined water from 0.05–10 % (m/m).

Definition: Combined water = water removable only at temperatures well above 100–110 °C.

Principle: Liberation of combined water by controlled heating (predrying at ~105 °C then progressive heating up to ~950 °C) in a dry nitrogen stream; collection of evolved water into an ethylene glycol–methanol absorber; titration by Karl Fischer titration with electrometric end-point detection.

Apparatus: Heating tube, two furnaces (low and high temperature), drying towers, absorption cell, platinum electrodes, electrometric titrator, gas flowmeter and sample boats.

Reagents: Dry nitrogen, desiccants (silica gel, Mg(ClO4)2), ethylene glycol–methanol absorber and Karl Fischer solution standardized on the day of use.

Sampling & sample prep: Laboratory sample prepared per ISO 3081/3082/3083; predried test samples per ISO 7764; recommended particle sizes (e.g., −100 µm or −160 µm for ores with significant combined water/oxidizable compounds).

Quality control: Blank tests, use of certified reference materials, replicate determinations, apparatus conditioning and calibration, and defined repeatability/precision criteria and calculation procedures for reporting results.

Applications and users

Practical for metallurgical laboratories, mining QA/QC teams, iron ore concentrate producers, sinter plant quality control and accredited testing laboratories needing accurate combined water determination.

Use cases: Moisture specification compliance, process control (drying, sintering), material characterization for shipping/sales contracts, and verification of product drying or calcination processes.

Benefits: Provides a standardized, traceable method for combined water measurement that minimizes interference from free moisture and ensures comparable results across labs.

Related standards

ISO 3081 - Iron ores: Increment sampling (manual)

ISO 3082 / ISO 3083 - Sampling and sample preparation

ISO 7764 - Preparation of predried test samples for chemical analysis

Keywords: ISO 7335:1987, combined water, Karl Fischer titrimetric method, iron ores, moisture determination, absorption cell, heating tube, laboratory standard.

ISO 7335:1987 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

ISO 7764:1985

Iron ores — Preparation of predried test samples for chemical analysis

BS EN ISO 308:1998

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BS ISO 3082:2017

Iron ores. Sampling and sample preparation procedures.

ISO 3083:1973

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