Calcined kaolin anachokera ku United States, poyambirira kuchotsa organic carbon phindu mu kaolin zofewa ndi kusintha whiteness mankhwala.Pambuyo pake, anthu adagwiritsa ntchito njirayi pokonza kaolin yoyezera malasha, ndikupanga zinthu zogwira ntchito, zapamwamba, komanso zamtengo wapatali kuposa ordin...
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