Overview
ISO 567:2021 is an internationally recognized standard developed by the International Organization for Standardization (ISO) that specifies a precise method for determining the bulk density of coke using a small container. This standard applies specifically to coke samples with a nominal top size not greater than 125 mm and involves measuring the mass of coke in a cubical or cylindrical container with a capacity of 0.2 cubic meters. Bulk density measurement is crucial for understanding the physical characteristics of coke, such as particle shape and size distribution, which impact its behavior in industrial applications.
Key Topics
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Scope of Measurement
ISO 567:2021 targets the determination of coke bulk density in small containers, either cubical or cylindrical, with a volume of 0.2 m³.
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Sample Preparation and Sampling Techniques
Representative coke samples should be collected according to ISO 13909-5 or ISO 18283 standards to ensure consistent and reliable testing results. Recommended sample masses range from 600 kg to 1,000 kg depending on particle size.
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Apparatus Specifications
The standard requires a rigid, waterproof container with a smooth inner surface and precisely known volume. Weighing equipment with accuracy better than 0.1% error or 250 g is essential for both empty and filled container masses.
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Test Procedure
The process includes:
- Determining the empty container mass and verifying its volume using water filling.
- Charging the container with coke in layers with a controlled fall height (not exceeding 250 mm).
- Leveling the surface and weighing the container plus coke.
- Performing duplicate tests for accuracy.
- Measuring total moisture content following ISO 579 and applying it to calculate dry bulk density.
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Calculations and Results Reporting
Bulk density is calculated as the mass of coke per container volume, corrected for moisture content. Results must be reported to three significant figures and include test conditions, sample information, and moisture content for transparency.
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Precision and Repeatability
The standard specifies that duplicate tests by the same operator should not vary by more than 30 kg/m³, assuring test repeatability. However, reproducibility between laboratories is not defined due to potential sample alterations during transport.
Applications
The ISO 567:2021 method is widely used in industries where coke quality and characteristics substantially impact operational efficiency and product quality, including:
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Metallurgical Processes
Precise bulk density data are essential in blast furnace operations and coke handling to optimize combustion, packing, and airflow.
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Quality Control and Product Specification
Coke producers and consumers use this standard to verify product quality, ensuring that coke meets specified physical requirements.
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Research and Development
Bulk density measurements contribute to developing new coke types or refining existing products by analyzing physical behavior in controlled conditions.
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Material Handling and Storage
Determining coke bulk density helps design appropriate storage containers, transport mechanisms, and handling protocols based on material weight and volume relationships.
Related Standards
ISO 567:2021 complements and references several related ISO standards for comprehensive coke analysis, including:
- ISO 579 - Coke: Determination of total moisture content, crucial for dry basis bulk density calculations.
- ISO 728 - Coke: Size analysis by sieving, for understanding particle size distribution.
- ISO 13909-5 and ISO 13909-6 - Hard coal and coke mechanical sampling and sample preparation protocols.
- ISO 18283 - Manual sampling methods for coke ensuring representative sample acquisition.
- ISO 1013 - Coke: Determination of bulk density in large containers, providing an alternative approach for larger volume samples.
By adhering to ISO 567:2021, industries worldwide can achieve standardized, accurate, and reliable coke bulk density measurements essential for process optimization and product consistency. For more information or to obtain the standard, visit ISO’s official website.