赤せき泥でいせきでいMeanings1nounred mud; bauxite tailings; red sludgeTechnical term for the highly alkaline waste product from bauxite refining (Bayer process).赤せき泥でいはアルミナ精せい錬れんの副ふく産さん物ぶつで、強きょうアルカリ性せいの廃はい棄き物ぶつです。Red mud is a byproduct of alumina refining and is a highly alkaline waste material.