ISO 11412-1998 PDF

Full title and description

Carbonaceous materials for the production of aluminium — Calcined coke — Determination of water content. This International Standard specifies a gravimetric method for determining the water (moisture) content of calcined coke used in aluminium production, expressed as a percentage by mass of the solid material.

Abstract

ISO 11412:1998 defines a laboratory procedure for measuring moisture in calcined coke (fragmented, granular carbonaceous and graphite materials) by controlled drying and loss-of-mass measurement. The procedure is based on established national practice (referencing DIN 51904) and gives requirements for apparatus, sample preparation, test procedure, expression of results, precision and test reporting.

General information

• Status: Published (confirmed current by ISO review).
• Publication date: 9 July 1998.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 71.100.10 — Materials for aluminium production.
• Edition / version: Edition 1 (1998).
• Number of pages: 3 pages.

Scope

Applies to the determination of water content in calcined coke intended for use in aluminium production. The standard covers required apparatus, sampling and sample preparation, the drying procedure for a representative laboratory sample, calculation and reporting of results, and provides information on precision (repeatability and reproducibility) for the method. It is intended for use where routine quality control and specification of calcined coke moisture are required.

Key topics and requirements

• Principle: gravimetric determination of moisture by oven-drying to constant mass and calculation of mass loss as percentage water content.
• Reference method origin: method based on DIN 51904 practice and adapted for calcined coke testing.
• Apparatus: drying oven (temperature control), analytical balance, suitable sample containers/trays and sieving equipment for sample preparation.
• Sample preparation: requirements for representative sampling and preparation (sieving, sample mass) to obtain a test portion representative of the lot.
• Procedure: controlled drying (specified temperature range and criteria for constant mass), successive weighings and calculation steps to report moisture content.
• Precision: statements on repeatability and reproducibility and guidance for reporting duplicate test results.
• Test report: required information such as sample identification, test method reference, results, date, deviations and observations.

Typical use and users

Used by aluminium smelters, coke producers and suppliers, independent testing laboratories, quality-control departments and materials engineers. Typical applications include incoming-material inspection, supplier verification, process control for smelting operations and storage/handling assessments where moisture content affects performance.

Related standards

Standards commonly referenced with ISO 11412 include ISO 6375 (sampling of carbonaceous products used for aluminium production) and ISO 5725-1 (accuracy — trueness and precision of measurement methods) as well as the national standard DIN 51904 which influenced the method. Complementary standards address other physical and chemical determinations for carbonaceous materials used in metallurgy.

Keywords

ISO 11412, calcined coke, water content, moisture determination, carbonaceous materials, aluminium production, gravimetric drying method, quality control, sampling, test method.

FAQ

Q: What is this standard?

A: ISO 11412:1998 is an international standard that specifies a laboratory method for determining the water content of calcined coke used in aluminium production.

Q: What does it cover?

A: It covers the principle (gravimetric drying), required apparatus, sample preparation, the drying procedure to constant mass, calculation of results, precision information and test-reporting requirements.

Q: Who typically uses it?

A: Aluminium producers, coke suppliers, QC and R&D laboratories, materials engineers and third‑party testing bodies involved in raw-material verification and process control.

Q: Is it current or superseded?

A: The 1998 edition was reviewed and confirmed by ISO in the systematic review process (confirmation recorded in 2020), so the 1998 edition remains the current published version. Users should check the ISO catalogue for any future revisions.

Q: Is it part of a series?

A: It is part of the family of standards addressing carbonaceous materials for aluminium production and is related to sampling and measurement accuracy standards (for example ISO 6375 and ISO 5725 series), but it is a standalone test method specific to calcined coke moisture.

Q: What are the key keywords?

A: Calcined coke, water content, moisture, carbonaceous materials, aluminium production, gravimetric method, drying oven, sampling, precision, test report.