| 一水硬铝石矿-氢氧化钠体系微波焙烧相变规律 |
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| 引用本文： | 黎氏琼春,巨少华,彭金辉,王仕兴,周烈兴.一水硬铝石矿-氢氧化钠体系微波焙烧相变规律[J].北京科技大学学报,2016(2):187-193. |
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| 作者姓名： | 黎氏琼春 巨少华 彭金辉 王仕兴 周烈兴 |
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| 作者单位： | 1. 微波能工程应用及装备技术国家地方联合工程实验室, 昆明650093;云南省特种冶金重点实验室,昆明650093;昆明理工大学冶金与能源工程学院, 昆明650093;2. 微波能工程应用及装备技术国家地方联合工程实验室, 昆明650093;云南省特种冶金重点实验室,昆明650093 |
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| 基金项目： | 国家自然科学基金资助项目(51264022)，云南省应用基础研究计划资助项目(KKSY201232038) |
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| 摘 要： | 以饱和氢氧化钠溶液为添加剂,利用微波加热对一水硬铝石矿进行焙烧处理. 考察微波焙烧温度和氢氧化钠添加量对一水硬铝石矿-氢氧化钠体系相变规律的影响,并对微波加热和常规加热得出的焙烧产物做物相结构的比较. 利用X射线衍射分析和扫描电子显微镜技术对熟料的物相结构和微观形貌进行分析. 结果表明微波加热促进氢氧化钠快速并充分的与一水硬铝石矿反应. 与常规加热相比,微波加热在更低的温度下能生成更多铝酸钠物相. 微波加热后的熟料疏松多孔,有利于后续溶出处理.
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| 关 键 词： | 铝土矿 氢氧化钠 微波加热 相变 |
Phase transformation of the diasporic bauxite--sodium hydroxide system in microwave heating |
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| Abstract: | In this work, microwave energy was used for roasting treatment of diaspora bauxite mixed with saturated NaOH solution as an additive. The influences of microwave heating temperature and NaOH addition on the phase transformation of the diaspora ore-sodium hydroxide system were investigated. The phase constitution of the roasted ore in microwave heating and conventional heating processes was compared under the same experimental conditions. The phase composition and microstructure of the roasted ore were comparatively analyzed by X-ray diffraction analysis and scanning electron microscopy. The results show that microwave roasting can facilitate the rapid and complete reaction between NaOH and the diaspore ore, leading to more NaAlO2 phase forming at lower tempera-ture as compared to conventional heating. After microwave heating, the roasted ore is porous, good for subsequent digestion processes. |
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| Keywords: | bauxite sodium hydroxide microwave heating phase transformation |
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