A by-product of the Thomas process steelmaking process, also known as Thomas slag (slag). It is used as a phosphate fertilizer. It is a type of fused phosphate fertilizer in the broad sense that it is produced by the melting process. When calcium oxide (CaO) is added to the phosphorus-containing pig iron melt in the Thomas converter and air is blown in, the phosphorus is oxidized to diphosphorus pentoxide (P 2 O 5) , which enters the slag together with the CaO. This is poured out and allowed to solidify by slow cooling, then crushed to produce the finished product. It is a dark brown, heavy, crystalline powder that is insoluble in water and soluble in weak acids. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
トーマス法製鋼の副産スラグで,トーマス鉱滓(こうさい)(スラグ)とも呼ぶ。リン酸肥料として利用される。溶融法で製造されるという意味では,広義の溶成リン肥の一種である。トーマス転炉中の含リン銑鉄溶融物に酸化カルシウムCaOを加えて空気を吹き込むと,リンが酸化して五酸化二リンP2O5となりCaOとともにスラグ中に入る。これを流し出して徐冷固化させたのち粉砕して製品とする。暗褐色の重い結晶性粉末で,水不溶性,弱酸可溶性である。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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