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A platform for research: civil engineering, architecture and urbanism
MODIFICATION METHOD FOR BORON-CONTAINING SLAG AND METHOD FOR MANUFACTURE OF CIVIL ENGINEERING-CONSTRUCTION MATERIAL WITH USE THEREOF, AND MODIFIED SLAG
To provide a method which can easily and economically suppress elution of boron from a boron-containing substance.SOLUTION: A modification method for boron-containing slag includes the steps: at which by equilibrium calculation based on a composition of slag before modification, a boron concentration C1 calculated before modification, which is a boron concentration in a liquid phase at a prescribed temperature T at which the slag is in a solid-liquid coexistent state, is calculated; at which a modifier, that contains SiO2 of 30% by mass or more and is dissolved in the liquid phase of the slag at the prescribed temperature T, is added to the slag before modification of which the boron concentration C1 calculated before modification exceeds a prescribed threshold C and in the state that the same is the prescribed temperature T or more, and is modified, and a modified slag, in which a boron concentration C2 calculated after modification in the liquid phase at the prescribed temperature T and in the solid-liquid coexistent state that is calculated by equilibrium calculation based on the composition becomes the prescribed threshold C or less, is prepared; and at which the modified slag is flown into a thin layer, and is cooled until a cooling velocity at a central part in a thickness direction of the thin layer becomes 10°C/min or more from the prescribed temperature T to 1000°C.SELECTED DRAWING: None
【課題】ホウ素含有物質からのホウ素の溶出を、簡便かつ経済的に抑制できる方法を提供する。【解決手段】改質前スラグの組成に基づく平衡計算により、該スラグが固液共存状態にある所定温度Ｔでの液相中のホウ素濃度である改質前計算ホウ素濃度Ｃ１を算出すること、前記改質前計算ホウ素濃度Ｃ１が所定の閾値Ｃを超える改質前スラグに対し、前記所定温度Ｔ以上にある状態で、ＳｉＯ２を３０質量％以上含有し、前記所定温度Ｔにて前記スラグの液相に溶解する改質材を添加してこれを改質し、組成に基づく平衡計算により算出される、固液共存状態にある所定温度Ｔでの液相中の改質後計算ホウ素濃度Ｃ２が前記所定の閾値Ｃ以下となる改質スラグを調製すること、及び前記改質スラグを薄層状に流し込み、該薄層の厚み方向中央部における冷却速度が、前記所定温度Ｔから１０００℃まで、１０℃／ｍｉｎ以上となるように冷却することを含む、ホウ素含有スラグの改質方法を採用する。【選択図】 なし
MODIFICATION METHOD FOR BORON-CONTAINING SLAG AND METHOD FOR MANUFACTURE OF CIVIL ENGINEERING-CONSTRUCTION MATERIAL WITH USE THEREOF, AND MODIFIED SLAG
To provide a method which can easily and economically suppress elution of boron from a boron-containing substance.SOLUTION: A modification method for boron-containing slag includes the steps: at which by equilibrium calculation based on a composition of slag before modification, a boron concentration C1 calculated before modification, which is a boron concentration in a liquid phase at a prescribed temperature T at which the slag is in a solid-liquid coexistent state, is calculated; at which a modifier, that contains SiO2 of 30% by mass or more and is dissolved in the liquid phase of the slag at the prescribed temperature T, is added to the slag before modification of which the boron concentration C1 calculated before modification exceeds a prescribed threshold C and in the state that the same is the prescribed temperature T or more, and is modified, and a modified slag, in which a boron concentration C2 calculated after modification in the liquid phase at the prescribed temperature T and in the solid-liquid coexistent state that is calculated by equilibrium calculation based on the composition becomes the prescribed threshold C or less, is prepared; and at which the modified slag is flown into a thin layer, and is cooled until a cooling velocity at a central part in a thickness direction of the thin layer becomes 10°C/min or more from the prescribed temperature T to 1000°C.SELECTED DRAWING: None
【課題】ホウ素含有物質からのホウ素の溶出を、簡便かつ経済的に抑制できる方法を提供する。【解決手段】改質前スラグの組成に基づく平衡計算により、該スラグが固液共存状態にある所定温度Ｔでの液相中のホウ素濃度である改質前計算ホウ素濃度Ｃ１を算出すること、前記改質前計算ホウ素濃度Ｃ１が所定の閾値Ｃを超える改質前スラグに対し、前記所定温度Ｔ以上にある状態で、ＳｉＯ２を３０質量％以上含有し、前記所定温度Ｔにて前記スラグの液相に溶解する改質材を添加してこれを改質し、組成に基づく平衡計算により算出される、固液共存状態にある所定温度Ｔでの液相中の改質後計算ホウ素濃度Ｃ２が前記所定の閾値Ｃ以下となる改質スラグを調製すること、及び前記改質スラグを薄層状に流し込み、該薄層の厚み方向中央部における冷却速度が、前記所定温度Ｔから１０００℃まで、１０℃／ｍｉｎ以上となるように冷却することを含む、ホウ素含有スラグの改質方法を採用する。【選択図】 なし
MODIFICATION METHOD FOR BORON-CONTAINING SLAG AND METHOD FOR MANUFACTURE OF CIVIL ENGINEERING-CONSTRUCTION MATERIAL WITH USE THEREOF, AND MODIFIED SLAG
ホウ素含有スラグの改質方法及びこれを利用した土木建築用資材の製造方法、並びに改質スラグ
KATO YUSUKE (author) / INOUE YOTARO (author) / YAMADA KATSUMI (author) / HOSOHARA SEIJI (author) / WATANABE KEIJI (author)
2022-04-18
Patent
Electronic Resource
Japanese
| European Patent Office | 2022
| European Patent Office | 2021
| European Patent Office | 2021