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  2. Krupp–Renn process - Wikipedia

    en.wikipedia.org/wiki/Krupp–Renn_Process

    The rotary kiln's maximum temperature ranges between 1,230 and 1,260 °C, which significantly exceeds the 1,000 to 1,050 °C threshold for iron oxide reduction. The main objective is to achieve a paste-like consistency of the ore gangue. [21] The reduced iron agglomerates into 3 to 8 mm metal nodules called Luppen.