ISO/TC 226/WG 3 - Smelter grade alumina

This document describes methods for the sample preparation of smelter-grade aluminium oxide. It covers the reduction of a bulk sample between 1 kg and 20 kg to produce a sample that is suitable for chemical and physical analysis. The reduced sample produced will be representative of the initial bulk sample. The bulk sample is considered to be from one source. The methods are suitable for dry, free-flowing aluminium oxide. As the moisture content will influence many physical analyses, the method aims to minimize the exposure of the sample to the atmosphere to avoid water absorption.

ISO 23201:2015 sets out a wavelength dispersive X-ray fluorescence spectrometric method for the analysis of aluminium oxide for trace amounts of any or all of the following elements: sodium, silicon, iron, calcium, titanium, phosphorus, vanadium, zinc, manganese, gallium, potassium, copper, chromium and nickel. These elements are expressed as the oxides Na2O, SiO2, Fe2O3, CaO, TiO2, P2O5, V2O5, ZnO, MnO, Ga2O3, K2O, CuO, Cr2O3, and NiO on an un-dried sample basis. The method is applicable to smelting-grade aluminium oxide. The concentration range covered for each of the components is also given.

ISO 2926:2013 specifies a dry sieve method using electroformed sieves for determining the mass distribution of the particle sizes in aluminium oxide used for the production of primary aluminium. This method is applicable to calcined aluminium oxide containing a maximum of 20 % mass fraction of particles having a mean diameter exceeding 150 µm, and containing a maximum of 15 % mass fraction of particles having a mean diameter less than 45 µm. This method is not applicable to the use of woven wire sieves.

ISO 12315:2010 describes methods for calculating and reporting the Al2O3 content of smelter-grade alumina, on either a dry or ignited basis, from the results of the determinations in accordance with ISO 806 and AS 2879.7.

The method based on the determination of the mass of a known volume after a free fall of the product without vibration in a stable container. Expression of the apparent density by division of this mass by the mass of a equivalent volume of water. Replaces ISO Recommendation R 903-1968.

Specifies the preparation of laboratory samples, crude samples for the determination of certain geometric properties and physical and pysico-chemical tests including the determination of moisture content and dried samples. The principle consists in grinding and sieving of the sample until passing completely through a sieve of meshes having apertures of 0,2 mm. Mixing and drying at about 300 °C. Replaces ISO Recommendation R 802-1968.