Overview
ISO 1014-1:2025 - "Coke - Part 1: Determination of apparent relative density" specifies a standardized laboratory method to determine the apparent relative density of coke. The standard defines the ratio of the mass of a given volume of dry coke to the mass of an equal volume of water using displacement (Archimedes’ principle). It covers sample preparation, required apparatus, two approved test procedures (elliptical tank weighing and rectangular tank with spout displacement), calculation, precision limits, and reporting requirements.
Key Topics and Requirements
- Scope and principle: Measurement by water displacement; apparent relative density = mass of dry coke / mass of equal volume of water.
- Two validated procedures:
- Elliptical tank method: uses a galvanized-wire cage (~0.03 m3), weighing device above tank, immersion for 15 minutes, 30 s drainage period; calculations use measured masses of cage/coke in air, in water and after draining.
- Rectangular tank with spout: uses displacement collection via spout; sample (~11 kg) immersed 15 minutes; displaced water collected and weighed.
- Apparatus: cage, elliptical or rectangular water tank (dimensions specified), weighing devices (1 g accuracy for small balances, platform scales to 25 g), drainage tray and drying oven.
- Sample preparation:
- Representative sampling per ISO 13909‑6 or ISO 18283 and size analysis per ISO 728 (25 mm sieve).
- Dry to constant mass at 105–200 °C, cool, shake and brush off dust.
- Timing and handling: immersion 15 min; drainage period limited to 30 s to control pore drainage effects.
- Expression of results: formulae provided for each procedure; report mean of duplicates to nearest 0.01.
- Precision: repeatability limit 0.02 (same lab/operator); reproducibility limit 0.03 (different labs).
- Test report requirements: sample ID, reference to ISO 1014‑1:2025, date, results and method used.
Applications and Who Uses It
- Quality control in coke production and blast-furnace feedstock assessment.
- Metallurgical and steelmaking laboratories checking material density and porosity.
- Third-party testing labs, research institutions and process engineers monitoring coke physical properties.
- Useful for product specifications, trade, and conformity testing where apparent relative density affects reactivity, handling and performance in thermal processes.
Related Standards
- ISO 728 - Coke - Size analysis by sieving
- ISO 3310-2 - Test sieves (perforated metal plate)
- ISO 13909-6 - Coal and coke - Mechanical sampling (test sample preparation)
- ISO 18283 - Coal and coke - Manual sampling
- ASTM D167 - (Referenced for displacement procedure details)
Keywords: ISO 1014-1:2025, apparent relative density, coke density determination, Archimedes principle, coke testing, elliptical tank, rectangular tank with spout, sampling, repeatability, reproducibility.
