溶成ケイ酸カリ肥料中の主要鉱物

概要

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A study was made by chemical, X-ray diffraction and electron-microscopic methods of analysis to clarify the chemical composition, formation condition and citric-, water- and 1/2 M-hydrochloric acid-solubilities of an unknown major compound present in fused potassium silicate fertilizer, which had been produced by the reaction of potassium carbonate with the slag obtained during desiliconization of hot metal or molten pig-iron at 1400℃. It was found in the present study that the major compound of the fertilizer was K_2Ca_2Si_2O_7 of tetragonal system with lattice constants of a=0.8784nm and c=0.6961nm. The silicate was easily formed at 1100-1150℃ ; lower temperatures than 1050℃ brought out insufficient reaction to form a mixture of the silicate, K_2SiO_3 and β-Ca_2SiO_4-A part of potassium in the silicate started to be volatilized at 1161℃, and its amount volatilized increased to 0.45% at 1200℃ and 2.23% at 1300℃, respectively, resulting in forming a portion of CaSiO_3. The citric- and water-solubilities of potassium (C-K_2O/T-K_2O and W-K_2O/T-K_2O) in the silicate was 98.4% and 9.9%, respectively, and 1/2 M-hydrochloric acid-solubility of silica (S-SiO_2/T-SiO_2) in the compound was 49.3%.
2001-08-05