ISO 6791:1981

Name: ISO 6791:1981 — Carbonaceous materials for the production of aluminium — Pitch for electrodes — Determination of contents of quinoline-insoluble material
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Carbonaceous materials for the production of aluminium — Pitch for electrodes — Determination of contents of quinoline-insoluble material

Название (английский):

ISO 6791:1981

Carbonaceous materials for the production of aluminium — Pitch for electrodes — Determination of contents of quinoline-insoluble material

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 3
Дата публикации:: 1 ноября 1981 г.
Издание:: ISO IS 6791 edition 1 version 1
ICS:: 71.100.10

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Описание (английский):

Specifies a conventional gravimetric method for the determination. A test portion ist reated with quinoline in a beaker at 70 to 80 °C for 15 to 20 min. Then the dissolved test portion and the residue are brought to a Hartley funnel fitted with a filter pad, and are filtered. The washed and dried residue on the filter pad is weighed.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 6791:1981 specifies a conventional gravimetric method to determine the content of quinoline‑insoluble material in pitch for electrodes used in aluminium production. The standard describes sample preparation, extraction with quinoline, filtration through a Hartley funnel fitted with a glass‑fiber filter pad, washing, drying and weighing of the insoluble residue to calculate the percentage insolubles. It is intended for quality control and specification testing of carbonaceous electrode pitches.

Key Topics and Technical Requirements

Scope: Determination of quinoline‑insoluble material in carbonaceous pitches for aluminium electrodes.

Sample prep

Dry sample at 105–110 °C for 1 h, cool in a desiccator and weigh.
If hard, grind to particles < 200 µm; for soft pitches, melt/homogenize (≤150 °C, ≤10 min).
Recommended product particle size: 1–40 µm (mean 6–10 µm).

Reagents

Quinoline (freshly distilled; bp ~235–237 °C) and toluene (for rinsing).
Use analytical‑grade reagents.

Apparatus

Water bath maintained at 70–80 °C.
Hartley funnel (≈70 mm disk) or equivalent and glass‑fiber filter pads (70 mm, ≈98% retention at ~1.2 µm).
Oven for drying at 105–110 °C; balance to 0.005 g.

Procedure

Transfer ~1 g test portion to a beaker with ~1 g diatomaceous support and 25 ml quinoline.
Heat at 70–80 °C for 15–20 min with occasional stirring.
Filter hot through the prepared filter pad, wash the funnel and residue with hot quinoline (multiple ~5 ml rinses until clear), then rinse the beaker residues with toluene (ten 5 ml rinses).
Dry filter + residue at 105–110 °C, cool in desiccator, weigh to 0.005 g; repeat drying/weighing until two consecutive weights agree within 0.005 g.

Calculation

Percent insoluble = (mass of dried filter+residue − mass of filter − mass of added support) ÷ mass of test portion × 100.

Performance data

Reported repeatability ~1% (as per the standard); reproducibility value is given in the document.

Safety: Quinoline is toxic/irritant; toluene is highly flammable-conduct all operations in a well‑ventilated fume hood.

Applications and Users

Quality control laboratories at aluminium smelters and electrode manufacturers.

R&D and materials characterization groups assessing carbonaceous materials, electrode pitches and binder performance.

Third‑party testing labs providing compliance and specification testing for suppliers and customers.

Regulatory or procurement teams specifying pitch properties for electrode performance.

Related Standards

ISO 6257 (sampling and preparation of carbonaceous products for aluminium electrode pitches) is referenced for sampling procedures.

ISO 6791 was developed under ISO/TC 47 (Chemistry) and has supporting approval from IUPAC.

Keywords: ISO 6791:1981, quinoline‑insoluble, pitch for electrodes, carbonaceous materials, aluminium production, gravimetric method, Hartley funnel, filter pad, quinoline, toluene.

ISO 6791:1981

Abstract

Похожие стандарты

Overview

Key Topics and Technical Requirements

Applications and Users

Related Standards

Технические детали

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