A type of dry-type phosphate fertilizer. It is produced by adding additives to phosphate rock and calcining it in air or a stream of steam to decompose the main mineral, fluorapatite, and solubilize the phosphorus. There are three established industrial production methods: (1) reacting with sodium carbonate to produce rhenanite CaNaPO4 , (2) reacting with steam at high temperatures to defluorinate in the form of hydrogen fluoride, and (3) a combination of (1) and (2). An example of (1) is the German Rhenania phosphate, and an example of (2) is the American defluorinated calcined tricalcium phosphate. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
乾式リン酸肥料の一種。リン鉱石に添加剤を加えて,空気中または水蒸気気流中で焼成し,主体鉱物のフッ素リン灰石を分解し,リンを可溶化する方法で製造する。工業的製法が確立されているのは,(1)炭酸ナトリウムと反応させレナニットCaNaPO4をつくる,(2)水蒸気との高温反応でフッ化水素の形で脱フツさせる,(3)上の(1)と(2)の折衷型,の3種である。(1)の例はドイツのレナニアリン肥Rhenania phosphate,(2)の例はアメリカの脱フツ焼成リン酸三石灰である。
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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