Hoʻolālā kūikawā ʻia ka ʻōwili wili kiʻekiʻe kiʻekiʻe no ka wili mua ʻana i nā clinkers sima, ka ʻōpala mineral, nā ʻili kila a pēlā aku i loko o nā granule liʻiliʻi, e ʻohi loa i nā minela metala (ka hao, manganese ores, copper ores. , na hua kepau-zinc, vanadium ores a me na mea e ae) a e wili i na minelala non-metala (ka lanahu gangue, feldspar, nephe-line, dolomite, limestone, quartz, etc.) i pauda.