| 利用水合硅酸钠钙渣回收碱并用于制备硅灰石纳米粉体的实验研究 |
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| 引用本文： | 王晓艳,马鸿文,俞子俭,王霞.利用水合硅酸钠钙渣回收碱并用于制备硅灰石纳米粉体的实验研究[J].现代地质,2011,25(1):163-168. |
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| 作者姓名： | 王晓艳 马鸿文 俞子俭 王霞 |
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| 作者单位： | 1. 中国地质大学矿物材料国家专业实验室,北京,100083
2. 陕西大秦矿业有限公司,陕西西安,710065 |
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| 基金项目： | "十一五"国家科技支撑计划课题 |
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| 摘 要： | 从高硅含铝原料霓辉正长岩中提取氧化铝时,硅以水合硅酸钠钙的形式排出。实验研究了水合硅酸钠钙渣的高效利用技术。利用水合硅酸钠钙自身的水解作用和在NaOH溶液中使之分解两种方法来回收其中的Na2O,所得NaOH溶液经蒸发浓缩后可循环利用。回收碱后剩余的固体渣用来制备硅灰石粉体。实验得出回收碱的优化条件为温度180℃,起始溶液的Na2O浓度为20 g/L,液固比为4∶1,洗涤6~7次。在此条件下,碱回收率可达90%以上。对回收碱后所得固体渣进行差热-热重分析,确定制备硅灰石粉体的煅烧温度。在820℃下煅烧2 h,制得颗粒尺寸为50~100 nm的α-CaS iO3纳米粉体,对其反应机理进行了初步的探讨。
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| 关 键 词： | 非水溶性钾矿 高压水化学法 回收碱 硅钙渣 α-硅灰石 |
An Experimental Study on Preparation of Nanocrystalline Wollastonite Powders from Sodium-Calcium Siliceous Hydration Residue |
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| WANG Xiao-yan,MA Hong-wen,YU Zi-jian,WANG Xia.An Experimental Study on Preparation of Nanocrystalline Wollastonite Powders from Sodium-Calcium Siliceous Hydration Residue[J].Geoscience——Journal of Graduate School,China University of Geosciences,2011,25(1):163-168. |
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| Authors: | WANG Xiao-yan MA Hong-wen YU Zi-jian WANG Xia |
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| Institution: | WANG Xiao-yan1,MA Hong-wen1,YU Zi-jian2,WANG Xia1(National Laboratory of Mineral Materials,China University of Geosciences,Beijing 100083,China) |
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| Abstract: | This study is focused on the efficient utilization technique of sodium-calcium siliceous hydration residue,which is remained after treating the high silicon aluminum-containing materials aegirine-augite syenite.The alkali of sodium-calcium siliceous hydration was recycled by its self-hydrolysis and decomposition in NaOH solution.The obtained diluted NaOH solution can be recycled after being concentrated.The influences of temperature,L/S ratio,initial Na2O concentration and washing times were experimentally ... |
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| Keywords: | insoluble potassium ore high pressure hydro-chemical process alkali recovery calcium silicate residue α-wollastonite |
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