GB/T 13241-2017 in English

Interpretation of GB/T 13241—2017 National Standard of the People's Republic of China

Standard Background and Revision Notes

GB/T 13241—2017 "Determination of the Reducibility of Iron Ore" was issued in 2017, replacing the old version of the standard in 1991. This revision mainly improves the following aspects:

• Modified normative references
• Clarified the requirements for mass flow controllers of test equipment
• Improved gas control accuracy
• Added an appendix description of CO generator

Core Principles of Determination of Reducibility of Iron Ore

This standard adopts the fixed bed method and uses a mixed gas of CO and N₂ (30% CO ±0.5%, 70% N₂ ±0.5%) for isothermal reduction at 900°C. By measuring the mass loss of an iron ore sample over a certain period of time, its reduction degree and reduction rate index are calculated.

Key term explanation and practical application cases

Comparative Analysis of Standard Frameworks

The following is a comparison of the main technical differences between GB/T 13241—2017 and GB/T 13241—1991:

Implementation suggestions and precautions

Key equipment selection: When selecting a mass flow controller, ensure that its range and accuracy meet the standard requirements (CO: 5 L/min, N₂: 20 L/min, accuracy ±1.5% FS). It is recommended to calibrate the flowmeter and thermocouple at least once a year.

Experimental environment safety:Since the test involves toxic gas (CO), the test site must be well ventilated and equipped with a CO alarm. Operators should wear protective equipment and regularly test the CO concentration in the environment to ensure that it does not exceed 50×10^-6.

Data recording and processing:It is recommended to use a thermogravimetric balance to continuously record the change in sample mass and perform numerical rounding according to GB/T 8170. For the calculation of the reduction index RI and the reduction rate index RVI, it is necessary to strictly follow the standard formula to ensure that the results are accurate to one decimal place.

Summary

GB/T 13241-2017 "Determination of the reducibility of iron ore" significantly improves the accuracy of the determination of the reducibility of iron ore by introducing stricter gas control, temperature control accuracy and equipment calibration requirements. This standard provides a scientific and technical basis for the metallurgical industry, helps optimize the ironmaking process and improve product quality.