| 霞石正长岩烧结反应的热力学分析与实验 |
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| 引用本文： | 王芳,马鸿文,徐锦明,苏玉柱.霞石正长岩烧结反应的热力学分析与实验[J].现代地质,2006,20(4):657-662. |
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| 作者姓名： | 王芳 马鸿文 徐锦明 苏玉柱 |
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| 作者单位： | 中国地质大学,矿物材料国家专业实验室,北京,100083 |
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| 摘 要： | 霞石正长岩是一种富含K2O、A l2O3、S iO2的矿产资源。在综合分析云南个旧白云山霞石正长岩物相组成的基础上,对以Na2CO3为助剂中温分解霞石正长岩中的铝硅酸盐矿物,提取碳酸钾和氧化铝的技术路线进行了研究。根据热力学理论计算以Na2CO3为助剂,主要烧结产物为NaA lS iO4、KA lS iO4、Na2S iO3时的反应温度,结果表明理论上反应在800 K(527℃)左右开始发生。通过烧结反应实验,得到优化反应温度为800~850℃,霞石正长岩的分解率达95%以上。X射线衍射分析结果表明,烧结产物的主要物相为NaA lS iO4、KA lS iO4和Na2S iO3,与热力学计算结果一致。烧结产物的硫酸酸浸实验表明,硅铝分离效果良好,S iO2、A l2O3、K2O三者的提取率分别高达91.4%、92.2%、92.5%。与前苏联的石灰石烧结法相比,本工艺具有低能耗、低物耗和生产过程清洁高效等优点。
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| 关 键 词： | 霞石正长岩 碳酸钠 烧结反应 硅铝分离 氧化铝 |
| 文章编号： | 1000-8527(2006)04-0657-06 |
| 收稿时间： | 08 9 2006 12:00AM |
| 修稿时间： | 10 19 2006 12:00AM |
Sintering Reaction of Nepheline Syenite: Thermodynamic Analysis and Experimental Study |
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| WANG Fang,MA Hong-wen,XU Jin-ming,SU Yu-zhu.Sintering Reaction of Nepheline Syenite: Thermodynamic Analysis and Experimental Study[J].Geoscience——Journal of Graduate School,China University of Geosciences,2006,20(4):657-662. |
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| Authors: | WANG Fang MA Hong-wen XU Jin-ming SU Yu-zhu |
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| Institution: | National Laboratory of Mineral Materials, China University of Geoscienees, Beijing 100083, China |
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| Abstract: | Nepheline syenite is an important kind of mineral resource rich in K_(2)O,Al_(2)O_(3) and SiO_(2).Thermodynamic calculation shows that the temperature of the sintering reaction is around 800 K(527 ℃),with sodium carbonate as the additive,and the products are mainly NaAlSiO_(4),KAlSiO_(4) and Na_(2)SiO_(3).The sintering experimental results show that the decomposition temperatures of the major aluminosilicate minerals in the nepheline syenite are ranging from 1,073 to 1,123 K(800-850 ℃),and the products are those as expected.The(decomposition) rate of minerals in the nepheline syenite is over 95%.Leaching experiments of the sintered products by acidic solution show that the separation of silica and alumina by the current procedure is superior,with extraction rates of SiO_(2),Al_(2)O_(3) and K_(2)O up to 91.4%,92.2% and 92.5% respectively.The technique developed in this paper is therefore a process with less energy and raw mineral resource consumptions,and cleaning production,compared with the Russian limestone-sintering technique. |
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| Keywords: | nepheline syenite sodium carbonate sintering reaction separation of silica and alumina alumina |
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