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Effect of Al3+ on Tobermorite Crystallinity

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The difference betWeen the systems of CaO-SiO2-H2O and CaO-SiO2-Al(OH)3-H2O, was studied,especially the effect of Al3+ on the crystallinity of tobermorite was focussed. As a result, in the system of CaO-SiO2-H2O, tobermorite formed early, howevey, with reaction time forward, tobermorite was replaced by xonotlite. So far as CaO-SiO2-Al(OH)3-H2O was concemed, hydrothermal reaction was carried out under the same condition as CaO-SiO2-H2O to study the morphological changes of tobermorite crystals. It was found that Al3+ accelerated the crystal growth of tobermorite to some extent and was in favor of platy crystals. Moreover, with the Al3+ content increasing in the starting material, the morphology of tobermorite did not change magnificently, but platy crystals became more and more eminent. As soon as the Al2O3
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D0I:10.13374/j.issn1001053x.2000.04.032 Vol.22 No.4 宋卫东等:程潮铁矿淹井前后采场溜并稳定性数值分析 ·295· 作状态下投入运行. 参考文献 (4)由于加固后的围岩体经历过塑性破坏1于学馥地下工程围岩稳定性分析.北京:煤炭工业出 过程,其强度特性仍然会随外界的剧烈扰动发 版社,1983 生变化.因此,建议现场对放矿过程进行控制, 2 Sharma K G,Pande G N.Stability of Rock Masses Rein- 避免对井壁的严重冲击,在井筒运行期间,对井 forced by Passive Fully-grouted Rock Bolts.Int J Rock Mech Min Sci,1988,25(5):55 筒的状况进行常规监测,及时对破坏部位进行 处理,使井筒始终处于良好的工作环境和状态 之中 Numerical Analysis on the Stope Orepass Stability in the Pit of Chengchao Iron Mine in Front and Behind Submerged Well SONG Weidong"WANG Jin'an,KUANG Zhongxiang 1)Resources Engineering School.UST Beijing.Beijing 100083.China 2)Mining Corp.of Wuhan Iron and Steel Company,Wuhan 430080,China ABSTRACT FLAC 3D is used in the numerical simulation on the stope orepass stability in front and behind sumberged well and reinforcement.The reliability and reasonableness of reinforce technique are verified.Its important reference value could be used to similar stop orepasses. KEY WORDS submerged well;stope orepass;reinforcement;stability analysis 女幸本来章本海本幸存年必在★年督章心本个令女◆春来衣幸女女来本本衣者泰章泰◆单染旅★旋海海旅海冷本章茶★米米哈茶冷◆冷海水将*米冷 Effect of Al"on Tobermorite Crystallinity Fengmei Liu,Deping Chen,Wen Ni,Zhenyuan Cao Resources Engineering School,University of Science and Technology Beijing,Beijing 100083,China (Received 1999-08-03) Abstract:The difference between the systems of CaO-SiO,-H.O and CaO-SiO2-Al(OH),-H2O,was studied, especially the effect of Alon the crystallinity of tobermorite was focussed.As a result,in the system of CaO- SiO:-H2O,tobermorite formed early,however,with reaction time forward,tobermorite was replaced by xonotlite.So far as CaO-SiO,-Al(OH)-H.O was concerned,hydrothermal reaction was carried out under the same condition as CaO-SiO:-H2O to study the morphological changes of tobermorite crystals.It was found that Alaccelerated the crystal growth of tobermorite to some extent and was in favor of platy crystals.Moreover, with the Al"content increasing in the starting material,the morphology of tobermorite did not change mag- nificently,but platy crystals became more and more eminent.As soon as the Al.O,content was over 15.6%, synthetic mineral greatly changed in structure and turned into hibschite different from 1.1 nm tobermorite.Ob- viously,xonotlite was not apt to form in the presence of Al". Key words:calcium silicate hydrate;xonotlite;1.1 nm tobermorite;hibschite (From:Journal of University of Science and Techonlogy Beijing(English Edition),2000,7(2):79)

宋卫 东等 程 潮 铁 矿 淹 井 前 后 采场 溜 井稳 定性 数值 分析 一 作状 态 下 投 入 运 行 由于 加 固后 的 围岩 体 经 历 过 塑 性 破 坏 过 程 , 其 强 度特性 仍然 会 随 外 界 的剧 烈 扰 动 发 生 变 化 因此 , 建议 现 场 对 放 矿 过 程进 行控 制 , 避免对 井壁 的严 重 冲击 在井 筒运 行 期 间 , 对 井 筒 的状况 进行 常规监 测 , 及 时对破 坏 部 位进 行 处 理 , 使井筒 始 终 处 于 良好 的工 作 环 境 和 状 态 之 中 参 考 文 献 于 学馥 地 下 工 程 围岩 稳 定性分 析 北 京 煤炭 工 业 出 版 社 , , 一 , , 七 肠 , 恻万 公, 心 , , , , , 而 而 加 升 脚 , , 肠 , , , , 一 一 一 一 一 一 一 , , ,‘ , 一 , 苏 , 加 , 勿 一 一 一 , 坤 一 一 勿 ,‘ 八 , , , , , , , ,气 场 月阳 粉 舒 万 , , DOI :10.13374/j .issn1001-53x.2000.04.032

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