BS ISO 8371:2024
Iron ores for blast furnace feedstocks. Determination of the decrepitation index
- Standard No.
- BS ISO 8371:2024
- Release Date
- 2024
- Published By
- British Standards Institution (BSI) GB / BSI
- Latest
- BS ISO 8371:2024
- Introduction
Analysis of the core content of the standard
BS ISO 8371:2024 specifies a test method for evaluating the degree of particle size degradation of iron ore by rapid heating. Its core indicator, hot cracking index (DI-6,3), is defined as the mass percentage of particles passing through a 6.3mm sieve after the sample is heat treated at 700℃.
Technical comparison between the new and old versions
Technical parameters 2015 version 2024 version Specimen drying time Unspecified 24 hours at 105±5℃ Screen type Unspecified Wire mesh in accordance with ISO 3310-1 Heating rate control Vague description 700±10℃ in 30±3 minutes
Key test process
- Sampling preparation: Take -25.0/+20.0mm lump ore according to ISO 3082, and 5kg sample needs to be dried at 105℃ for 24 hours
- Testing equipment: Including 700℃ resistant sample container, central temperature measuring thermocouple, 6.3mm standard sieve, etc.
- Heat treatment: Raise the sample from room temperature to 700℃ within 30 minutes, and maintain the temperature accuracy of ±10℃
- Sieving and weighing: After cooling, sieve with 6.3mm, and accurately weigh the material above/below the sieve (accuracy 0.1g)
Application case
An iron ore enterprise used this method to measure the DI-6,3 index to be 18.7%. Combined with the reducibility test data, it was found that the thermal stability of the ore was negatively correlated with the reduction rate, which provided a basis for optimizing the blast furnace ore blending.
Key points for implementation
- Safety warning: Operations involve high-temperature equipment and protective equipment is required
- Quality control: It is recommended to use internal standard substances to regularly verify equipment repeatability
- Data recording: Key parameters that affect the results, such as screen type and temperature curve, must be recorded
- International comparison: Different laboratories need to unify screening conditions to ensure data comparability
Technical background of the standard
This standard was developed by ISO/TC 102/SC 3 (Iron Ore Physical Testing Subcommittee). The 2024 version mainly responds to the metallurgical industry's refined demand for the evaluation of the thermal stability of blast furnace raw materials. Together with tests such as reducibility and pulverization rate, it constitutes an iron ore metallurgical performance evaluation system.
BS ISO 8371:2024 Referenced Document
- ISO 11323 Iron ore and direct reduced iron - Vocabulary
- ISO 3082 Iron ores - Sampling and sample preparation procedures
- ISO 3310-1 Test sieves - Technical requirements and testing - Part 1: Test sieves of metal wire cloth
BS ISO 8371:2024 history
- 2024 BS ISO 8371:2024 Iron ores for blast furnace feedstocks. Determination of the decrepitation index
- 2015 BS ISO 8371:2015 Iron ores for blast furnace feedstocks. Determination of the decrepitation index
- 2007 BS ISO 8371:2007 Iron ores for blast furnace feedstocks. Determination of the decrepitation index
- 1995 BS ISO 8371:1994 Iron ores. Determination of decrepitation index
