ISO 12977:1999 PDF

Name: ISO 12977:1999 — Carbonaceous materials for use in the production of aluminium — Pitch for electrodes — Determination of volatile matter content
SKU: ISO 12977:1999
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Carbonaceous materials for use in the production of aluminium — Pitch for electrodes — Determination of volatile matter content

Название (английский):

ISO 12977:1999

Carbonaceous materials for use in the production of aluminium — Pitch for electrodes — Determination of volatile matter content

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 10
Дата публикации:: 2 декабря 1999 г.
Издание:: ISO IS 12977 edition 1 version 1
ICS:: 71.100.10

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Цена:150 €

Описание (английский):

La présente Norme internationale décrit une méthode empirique pour la détermination de la teneur en matière volatile des brais pour électrodes par analyse chromatographique en phase gazeuse de leur solution dans le toluène. Un respect rigoureux du mode opératoire est essentiel en raison de la nature empirique de la méthode.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 12977:1999 specifies an empirical gas chromatographic method to determine the volatile matter content of electrode pitch used in aluminium production. The standard defines volatile matter as the total percentage by mass of pitch components whose gas‑chromatographic retention times correspond to atmospheric‑pressure boiling points up to 360 °C under the prescribed conditions. Because the procedure is empirical, strict adherence to the method, reagents and chromatographic conditions is essential.

Key topics and technical requirements

Analytical principle: Simulated distillation by GC - establish a linear relationship between chromatographic retention time and atmospheric boiling point for a set of calibrant compounds, then calculate the mass fraction boiling ≤ 360 °C.

Reagents and calibrants:

Internal standard: dibenzothiophene (≥98% purity). Analysis is performed with and without added dibenzothiophene because it may be present in the pitch.
Calibrant mixture: naphthalene, 2‑methylnaphthalene, acenaphthene, dibenzofuran, fluorene, phenanthrene, fluoranthene and pyrene (all ≈ ≥98% purity).
Solvent: toluene (analytical quality).

Apparatus and chromatographic setup:

Gas chromatograph with heated injector (capable of ~300 °C), flame‑ionization detector (FID) and programmed temperature control (≈50–300 °C).
Non‑polar, low‑bleed capillary column (poly(dimethylsiloxane) type recommended).
Electronic integrator to record retention times and peak areas.

Sample preparation:

Representative sampling per ISO 6257.
Grind and sieve to pass a 212 µm test sieve.
Prepare two test solutions (with and without internal standard) in toluene, using ultrasonic treatment and settling/filtration to minimise insolubles.

Calibration & calculation: Determine response factors from the calibrant solution, construct the retention time vs boiling point relationship and compute the simulated distillation to obtain the volatile matter percentage.

Quality aspects: The standard includes precision, calculation, reporting requirements and an informative annex with boiling points of calibrants.

Applications and users

Who uses it:

Analytical laboratories supporting the aluminium industry
Quality control teams at electrode pitch and carbonaceous material manufacturers
Process engineers monitoring feedstock properties in aluminium smelting

Practical uses:

Quality assessment of pitch for electrodes
Process control and material specifications verification
Raw material acceptance testing and supplier qualification

ISO 12977:1999 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 6257:2002

Carbonaceous materials used in the production of aluminium — Pitch for electrodes — Sampling

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