ISO 19950:2015

Name: ISO 19950:2015 — Aluminium oxide primarily used for the production of aluminium — Determination of alpha alumina content — Method using X-ray diffraction net peak areas
SKU: ISO 19950:2015
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Aluminium oxide primarily used for the production of aluminium — Determination of alpha alumina content — Method using X-ray diffraction net peak areas

Название (английский):

ISO 19950:2015

Aluminium oxide primarily used for the production of aluminium — Determination of alpha alumina content — Method using X-ray diffraction net peak areas

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 25 ноября 2015 г.
Издание:: ISO IS 19950 edition 1 version 1
ICS:: 71.100.10

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Описание (английский):

ISO 19950:2015 sets out an X-ray diffraction method for the determination of the alpha alumina content of smelter grade alumina. The method is applicable to smelter grade alumina containing alpha phase at levels up to 50 %. The percentage by mass of alpha alumina is determined on an "as received" basis.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 19950:2015 specifies an X‑ray diffraction (XRD) method for determining the alpha alumina (α-Al2O3) content in smelter grade alumina. The method measures net peak areas of the corundum reflections and is applicable for samples containing up to 50% alpha phase, reported on an “as received” mass basis. ISO 19950:2015 is based on Australian Standard AS 2879.3‑2010 and provides procedural detail for calibration, sample preparation, measurement and calculation.

Key topics and technical requirements

Principle: Measure integrated peak areas of the (012) and (116) alpha‑Al2O3 reflections and compare with a 100% alpha alumina calibration standard to compute percent alpha by mass.

Calibration standard: Use a certified commercial 100% alpha alumina standard or prepare an in‑house standard by acid washing and high‑temperature calcination (1 300 ± 50 °C) as described.

Sample preparation:

Representative sampling per AS 4538.2.
Grind to particle size with 90% < 45 µm.
Prepare duplicate pressed mounts; inspect for imperfections.

Apparatus: X‑ray diffractometer (XRD), hydraulic press, rotary divider/riffle, grinding mill, furnace and ancillary equipment when preparing in‑house standard.

Measurement settings: Typical 2θ scan windows and tube settings for Co or Cu Kα1 radiation are provided; background positions must be outside peak scan ranges.

Calculations: Net peak area obtained by background subtraction; alpha content calculated separately for each peak and averaged. Formulae for net area and averaging are given.

Precision: Interlaboratory data indicate typical repeatability r ≈ 0.8% and reproducibility R = 0.08·α + 1.0 (α = % alpha alumina), with full precision tables included.

Reporting: Test report must identify sample, test dates, alpha content (% mass), number of results, observations and reference to ISO 19950.

Applications and users

ISO 19950:2015 is intended for:

Alumina refineries and quality control laboratories assessing corundum (alpha alumina) levels in feedstock for aluminium production.

Materials testing and R&D groups characterizing phase composition in refinery products.

Suppliers and purchasers who specify alpha alumina content in contracts and quality agreements. Practical uses include process control, product specification compliance, failure or performance investigations, and comparative testing of smelter grade aluminas.

Related standards and references

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

AS 2879.3‑2010 - Basis for this ISO method

AS 2850 - Interlaboratory test procedures referenced in precision studies

ICDD reference (ICDD file no. 46‑1212) for theoretical corundum peak positions

Keywords: ISO 19950:2015, alpha alumina, X‑ray diffraction, XRD, smelter grade alumina, corundum, calibration standard, peak areas, sample preparation, precision.

ISO 19950:2015

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards and references

Технические детали

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