ケイ酸カリ肥料の結晶質とガラス質の組成と溶解性

概要

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A mixture of fly ashes from domestic and imported coals was blended with potassium carbonate and calcium and magnesium hydroxides and calcined at 850-950℃ for 10-50 min to give potassium silicate fertilizer containing 22×1O^<-2>kg kg^<-1> K_2O, 13×10^<-2>kg kg^<-1> CaO, 5×10^<-2>kg kg^<-1> MgO, 37×10^<-2>kg kg^<-1> SiO_2,18×10^<-2>kg kg^<-1> Al_2O_3. The citric solubility of K_2O reached 93-94%, while 0.5 mol L^<-1> HCl solubility of SiO_2 reached 70-90%. Major compounds in the products were K_2O・Al_2O_3・2 SiO_2 (KAS_2), K_2O・Al_2O_3 (KA), K_2O・CaO・SiO_2 (KCS), and 3CaO・MgO・2SiO_2 (C_3MS_2), all of which were soluble in citric acid and 0.5 mol L^<-1> HCl. Quantitative X-ray analysis of the compounds using spinel as an internal standard showed that the crystalline compounds contained 50-70% of the total K_2O, indicating that a considerable portion of K_2O was present in a glassy phase. Tests on synthetic potassium silicate glass containing CaO, MgO and Al_2O_3 showed that the glass was highly soluble when the O/Si atomic ratio was larger than 3.1 and was hardly soluble when the ratio was smaller than 2.9.
社団法人日本土壌肥料学会の論文
1995-02-05