GB/T 10322.9 - 2023 for the determination of the specific surface area of iron ore, using the Burch breathability method. The standard specifies the required equipment, such as the technical parameters of the Burch breathalyzer. Detailed description of the preparation process of iron ore samples, covering particle size requirements, sample weighing and other links. Standardize the test operation process, including key steps such as instrument calibrating and ventilation time determination. Through this standard, the specific surface area of iron ore can be accurately determined, providing an important basis for evaluating the quality of iron ore and optimizing its application in steel smelting and other processes, helping the steel industry to improve production efficiency and product mass.