Overview
ISO 15967:2007 is an international standard developed by the International Organization for Standardization (ISO) that provides a standardized method for determining the tumble and abrasion indices of hot briquetted iron (HBI). This standard is specifically designed to evaluate the resistance of direct reduced iron (DRI) in HBI form to size degradation caused by impact and abrasion during handling, transport, and processing.
By applying this method, industries involved in the production, quality control, and transportation of direct reduced iron can reliably assess the physical durability of HBI. The test results serve as a valuable indicator for product quality, helping to minimize losses from particle breakdown and ensuring consistency in material performance.
Key Topics
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Scope:
The standard specifies procedures to measure the relative resistance of hot briquetted iron to mechanical degradation through impact (tumbling) and abrasion.
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Sampling and Sample Preparation:
Sampling must follow ISO 10835 for direct reduced iron and HBI. Test samples are oven-dried to constant mass and sieved to remove oversized particles.
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Testing Equipment:
The apparatus includes a steel tumble drum with lifters, a rotation mechanism capable of precise speed control, appropriate test sieves (40 mm, 6.30 mm, and 500 µm), and a weighing device with 1 g accuracy.
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Test Procedure:
- A test portion (~15 kg) is placed in the drum and tumbled at 25 revolutions per minute for 200 revolutions.
- After tumbling, material is sieved to separate fractions greater than 6.30 mm and less than 500 µm.
- The tumble index is calculated as the percentage of material retained above 6.30 mm.
- The abrasion index is calculated as the percentage of material passing below 500 µm.
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Results Interpretation:
The indices provide a quantifiable measure of the mechanical strength of HBI. Higher tumble and abrasion indices indicate better resistance to degradation.
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Test Report:
Must include reference to ISO 15967:2007, sample identification, laboratory details, test dates, results (indices), and any deviations or special conditions during testing.
Applications
ISO 15967:2007 is vital for:
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Quality Control:
Manufacturers of direct reduced iron use this test to ensure HBI products meet durability standards before shipment.
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Contractual Specifications:
The indices serve as acceptance criteria in trade agreements, enabling both buyers and sellers to verify product quality.
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Research and Development:
Researchers develop improved HBI formulations and production processes by measuring changes in mechanical toughness.
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Logistics and Handling:
Shipping and transport companies assess the risk of material degradation during bulk handling and transport, helping to optimize packaging and loading systems.
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Process Optimization:
Steel producers and iron ore processors use these parameters to improve operational handling and reduce fines generation.
Related Standards
- ISO 10835:2007 - Sampling and sample preparation of direct reduced iron and hot briquetted iron.
- ISO 3310-1:2000 - Technical requirements for metal wire test sieves.
- ISO 3310-2:1999 - Technical requirements for test sieves of perforated metal plate.
- ISO 11323:2002 - Vocabulary related to iron ore and direct reduced iron.
These complementary standards ensure the proper preparation, testing, and terminology are applied consistently across iron ore and direct reduced iron testing practices.
Keywords: ISO 15967:2007, hot briquetted iron, direct reduced iron, tumble index, abrasion index, HBI durability testing, mechanical degradation, impact resistance, abrasion resistance, steel industry standards, quality control in iron production, bulk material handling.