GB/T 29652 - 2013 Determination of carbon and sulfur content in direct reduced iron by high-frequency combustion infrared absorption method. This standard clarifies the determination principle and sets requirements for the performance and accuracy of high-frequency combustion equipment and infrared absorption detection devices. Detailed description of the collection, preparation process and weighing points of direct reduced iron samples, standardize various operations in the combustion process, including temperature control, Gas flow rate adjustment, etc. Through this standard, the carbon and sulfur content in direct reduced iron can be accurately determined, providing a unified method for direct reduced iron production and mass detection, helping to control product mass, and meeting the downstream industry's demand for direct reduced iron quality.