溶成ケイ酸カリ肥料の溶解特性と鉱物組成

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The citric- and water-solubilities and mineral composition of fused potassium silicate fertilizer produced in the steelmaking process were examined by chemical and X-ray diffraction methods. The formation of K_2Ca_2Si_2O_7 was analyzed in terms of the reaction of potassium carbonate with the slag, whose CaO/SiO_2 mole ratio was about 0.8. The amount of K_2Ca_2Si_2O_7 formed reached a maximum, when the K_2O/SiO_2 mole ratio was about 0.4,resulting in minimization of water-solubility of potassium to about 13%. In the case of using slag whose CaO/SiO_2 mole ratio was about 1,the water-solubility increased to 17%. The citric-solubility of potassium was higher than 90% for any K_2O/SiO_2 mole ratio. In the experiment with the K_2O-CaO-SiO_2 system reacting at 1,150℃, the amount of K_2Ca_2Si_2O_7 formed was maximum when the K_2O/SiO_2 mole ratio was about 0.5 and the CaO/SiO_2 mole ratio was about 1. The water-solubility of potassium decreased to a minimum of 10%. A higher CaO/SiO_2 mole ratio caused the formation of β-Ca_2SiO_4 and water-soluble amorphous potassium silicate in part, and a lower CaO/SiO_2 mole ratio caused the formation of K_2SiO_3 in part, resulting in an increase in water-solubility. The citric-solubility of potassium was higher than 90%, and a part of potassium was adsorbed into gelatinous silica formed during the weakly acidic dissolution experiment. On substituting magnesium for a part of calcium in K_2Ca_2Si_2O_7,the water-solubility increased because of the formation of K_2MgSiO_4. In the case of adding manganese instead of magnesium, the water-solubility did not increase as mentioned above, because of forming a solid solution substituted manganese for at most about 10% of the calcium in K_2Ca_2Si_2O_7.
2001-12-05

溶成ケイ酸カリ肥料の溶解特性と鉱物組成

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