中国炭灰を用いたケイ酸カリ肥料の組成と溶解性

概要

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The potassium silicate fertilizer was produced from Chinese Daido coal ash by calcining at 850-950℃ for 10-50 min with potassium carbonate, calcium hydroxide and magnesium hydroxide. The products contained 21×10^<-2>kg kg^<-1> K_2O, 0.7-5.5×10^<-2>kg kg^<-1>MgO, and 17.5-12.0×10^<-2>kg kg^<-1> CaO. The citric solubility of K_2O exceeded 90% while 0.5 mol dm^<-3>HCl solubility of SiO_2 reached 90% when the product calcined at 950℃ for 50 min contained 3×1O^<-2>kg kg^<-1> MgO and 14.5×10^<-2> kg kg^<-1> CaO. Major compounds in the products were K_2O・Fe_2O_3・2SiO_2 (KFS_2) containing about 30×10^<-2>kg kg^<-1> K_2O・Al_2O_3・2 SiO_2 (KAS_2), which may form a compound KAS_2・2 KFS_2. Considerable amounts of compounds K_2O・Al_2O_3 (KA), K_O・CaO・SiO_2 (KCS), and 3CaO・MgO・2SiO_2 (C_3MS_2), and a small amount of insoluble MgO・Fe_2O_3 (MF) were also formed.
社団法人日本土壌肥料学会の論文
1995-02-05