The application of steelmaking slag as agricultural material through the control of composition and structure

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K18270
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Metal making/Resorce production engineering
• Research Institution: Tohoku University
• Principal Investigator: GAO XU 東北大学, 多元物質科学研究所, 助教 (80707670)
• Co-Investigator(Renkei-kenkyūsha): KITAMURA SHIN-YA 東北大学, 多元物質科学研究所, 教授 (80400422) ; ITO TOYOAKI 東北大学, 大学院農学研究科, 准教授 (10176349)
• Research Collaborator: SHIBATA HIROYUKI 東北大学, 多元物質科学研究所, 教授 (50250824)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 製鋼スラグ系肥料 / 水田 / 遊離酸化鉄 / 非結晶相

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.

Free Research Field

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