ISO 18842:2015 PDF

Name: ISO 18842:2015 — Aluminium oxide primarily used for the production of aluminium — Method for the determination of tapped and untapped density
SKU: ISO 18842:2015
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Aluminium oxide primarily used for the production of aluminium — Method for the determination of tapped and untapped density

Название (английский):

ISO 18842:2015

Aluminium oxide primarily used for the production of aluminium — Method for the determination of tapped and untapped density

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 10 августа 2015 г.
Издание:: ISO IS 18842 edition 1 version 1
ICS:: 71.100.10

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Описание (английский):

ISO 18842:2015 describes methods for the determination of tapped and untapped bulk density of smelter grade aluminium oxide primarily used for the production of aluminium. Methods using the fall of sample into a receptacle have been found to be sensitive to flow rate variations, which are caused by physical properties of the aluminium oxide. ISO 18842:2015 minimizes flow rate variations.

Abstract

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Overview

ISO 18842:2015 specifies a laboratory method for determining tapped and untapped bulk density of smelter‑grade aluminium oxide (alumina) used primarily in aluminium production. The standard defines a controlled sample delivery and receiving arrangement that minimizes flow‑rate variations seen in simple “fall into a receptacle” methods. Results are reported on a moisture‑free (300 °C) basis and are suitable for production control, quality assurance and materials specification.

Key topics and requirements

Scope: Applies to smelter‑grade alumina for aluminium production; minimizes sensitivity to particle flow properties.

Sample preparation:

Condition sample in laboratory atmosphere for a minimum of 2 hours in a layer ≤ 5 mm, mix and split according to sampling guide (AS 4538.2).
Typical test portions: ~300 g for density tests, ~50 g for moisture (loss on ignition at 300 °C).

Apparatus:

Sample delivery apparatus with a 5.0 mm orifice and impact plate (abrasion‑resistant materials such as stainless steel, brass or aluminium).
Receiver: cylindrical container nominally 200 ± 10 ml and a length‑to‑diameter ratio ≈ 6:1; volume precisely determined by temperature‑corrected water mass.
Balance capable of 0.1 g readability, sieves (300–1 000 µm), straight edge, tapper and brush.

Procedure:

Untapped density: allow narrow stream to fill receiver, level with straight edge, weigh.
Tapped density: compact sample by controlled tapping while adding sample until no further settling; level and weigh.
Moisture correction using loss of mass at 300 °C (ISO 806).

Calculations and reporting:

Densities are calculated on a moisture‑free basis and reported in kg/m3 (rounded to nearest 1 kg/m3).
Test report must identify sample, reference ISO 18842:2015, provide untapped and tapped densities, test date and any unusual observations.

Precision:

Reported repeatability and reproducibility (95% confidence): untapped r = 13 kg/m3, R = 31 kg/m3; tapped r = 14 kg/m3, R = 52 kg/m3.

Applications and users

Primary users: alumina producers, aluminium smelters, materials testing laboratories and quality control teams.

Practical uses:

Incoming inspection of smelter‑grade alumina shipments.
Process control and specification compliance for aluminium production feedstock.
Comparative testing for product development, procurement and contract verification.

Related standards

ISO 806 - Determination of loss of mass at 300 °C and 1 000 °C (moisture correction).

AS 4538.2 - Guide to sampling of alumina (sample preparation).

AS 2850 - Interlaboratory precision guidance.

Keywords: ISO 18842:2015, aluminium oxide, alumina, tapped density, untapped density, bulk density, smelter grade, moisture‑free, MOI, aluminium production.

ISO 18842:2015 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

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