PRODUCTION METHOD OF MODIFIED CONVERTER SLAG AND PRODUCTION METHOD OF GRANULAR MATERIAL FOR ROAD BED MATERIAL

• Main Authors: YOKOYAMA HIDEKI, IMAI TETSUYUKI, HAYASHI KAZUYOSHI, SHIMODA ISAO, KAMO MOMOKI
• Format: Patent
• Language: English; Japanese
• Published: 02.02.2022
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DISPOSAL OF SOLID WASTE; LIME, MAGNESIA; METALLURGY; METALLURGY OF IRON; PERFORMING OPERATIONS; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; RECLAMATION OF CONTAMINED SOIL SOIL; REFRACTORIES; SLAG; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF NATURAL STONE

To modify a converter slag having high basicity generated in a converter refining process, that is, a converter slag having high refining capacity into a converter slag applicable to a road bed material without burden of a steelmaking process by a simple device configuration.SOLUTION: In a production method of a modified converter slag, a reformer mixed slag is obtained by spraying a powdery granulated slag reformer to a molten converter slag during flowing-down or to a position where the molten converter slag flows down into a slag-retaining vessel while flowing down the molten converter slag from the converter into the slag-retaining vessel, and mixing the slag reformer with the molten converter slag. Next, the reformer mixed slag is held in the slag-retaining vessel to form a reformer reaction slag. Next, the reformer reaction slag is discharged from the slag-retaining vessel, cooled and solidified to form a solidified slag. The solidified slag is pulverized and subjected to steam aging to obtain the modified converter slag.SELECTED DRAWING: Figure 1 【課題】転炉精錬工程で発生する塩基度が高い転炉スラグ、すなわち精錬能が高い転炉スラグであっても、簡易な装置構成によって、製鋼工程の負担を伴わずに、道路路盤材にも適用可能な転炉スラグに改質すること。【解決手段】溶融転炉スラグを転炉からスラグ保持容器内に流下しつつ、流下中の前記溶融転炉スラグに対して、または前記溶融転炉スラグが前記スラグ保持容器内に流下される位置に対して、粉粒状のスラグ改質材を吹き付けて、前記溶融転炉スラグにスラグ改質材を混合して改質材混合スラグとし、次いで、前記改質材混合スラグを、前記スラグ保持容器内で保持して、改質材反応スラグとし、次いで、前記改質材反応スラグを、前記スラグ保持容器から放流し、冷却して固化させて固化スラグとし、次いで、前記固化スラグを粉砕し、蒸気エージングを施して、改質転炉スラグを得る、改質転炉スラグの製造方法。【選択図】図１