| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
Nowadays, the decrease in soil pH, lack of silicate and free iron ion in soil solution are occurring in the paddy fields of Japan. Therefore, the steelmaking slag, a by-product from steelmaking process, has been expected as a costless solution. Both Ca and Si can be easily dissolved from steelmaking slag, however, the water-soluble amount of Fe is not enough even though the content of iron oxides in slag are high. To improve the water solubility of Fe, the use of a glassy phase majorly consists of CaO-SiO2-FeOx has been proposed in this study. The relation among the water solubility of glassy phase, chemical composition, and structure has been studied. In addition, through the control of chemical composition and cooling method, a slag which can simultaneously supply Ca, Si, and Fe with large amounts has been successfully synthesized, and this indicate it is possible to achieve a new type of fertilizer made of steelmaking slag which can easily supply Ca, Si, and Fe into paddy fields.
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