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发明公开
CN102964137A RH精炼炉用低硅再生镁铬捣打料及其制备方法 无效 - 驳回

RH精炼炉用低硅再生镁铬捣打料及其制备方法
摘要：
本发明公开了一种RH精炼炉用低硅再生镁铬捣打料，它由废弃的镁铬砖颗粒回收料按粒径级配组合而成，其中按重量百分比计算，粒径≤0.088mm的颗粒回收料占20~45%，0.088mm＜粒径≤3mm的颗粒回收料占15~45%，3mm＜粒径≤5mm的颗粒回收料占15~45%；且在各粒径级配的颗粒回收料总和中，其化学成份的质量百分比为MgO≥60%、Cr2O3≥15%、MgO+Cr2O3≥85%、SiO2≤1.5%。本发明还公开了该镁铬捣打料的制备方法。本发明制得的镁铬捣打料堆密度好，SiO2含量低，用它来填充RH精炼炉镁铬砖之间的缝隙，具有强度高，使用寿命长，容易施工等优点。本发明全部采用废弃镁铬砖为原料，既避免了废弃镁铬砖对环境的污染，又降低了生产成本，减少了对矿产资源的浪费。
摘要（英）：

The invention discloses a low-silicon regeneration magnesium-chrome ramming material for an RH refining furnace. The low-silicon regeneration magnesium-chrome ramming material is formed by combining recovered waste magnesium-chrome brick particles based on size grading, wherein the recovered particles with granularity not greater than 0.088mm account for 20 to 45%, the recovered particles with granularity more than 0.088mm and not greater than 3mm account for 15 to 45%, and the recovered particles with granularity more than 3mm and not greater than 5mm account for 15 to 45% in percentage by weight; and the total recovered particle at each size grading comprises the following chemical components in percentage by mass: not less than 60% of MgO, not less than 15% of Cr2O3, not less than 85% of MgO and Cr2O3, and not greater than 1.5% of SiO2. The invention also discloses a preparation method of the magnesium-chrome ramming material. The magnesium-chrome ramming material prepared by the preparation method disclosed by the invention is high in bulk density and low in content of SiO2, can be used for filling clearances among the magnesium-chrome bricks of the RH refining furnace, and has the advantages of being high in strength, long in service, and easy for construction. According to the preparation method, the waste magnesium-chrome bricks are used as the raw materials, so that the pollution of the waste magnesium-chrome bricks to the environment can be avoided, the producing cost can be reduced, and the waste of the mineral resources can be reduced.

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