GB/T 6730.56-2019 prescribes a method for the determination of aluminum content in iron ore by flame atomic absorption spectroscopy (AAS). The standard applies to natural iron ore, iron concentrate, sinter and pellet. The determination principle is described in detail, the required equipment and reagent requirements are clarified, and the sample preparation and analysis steps are standardized. The measurement range (mass fraction) is 0.01% -2.00%, which provides a unified specification for the detection of aluminum content in iron ore and helps to accurately evaluate the mass of iron ore. It is of great significance to steel production and other related fields.