| 湿法氟化制备水合氟化钆的脱水机制及其氧的行为 |
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| 引用本文： | 郝占忠.湿法氟化制备水合氟化钆的脱水机制及其氧的行为[J].有色金属(冶炼部分),2010(5). |
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| 作者姓名： | 郝占忠 |
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| 作者单位： | 包头师范学院化学学院,包头,014030 |
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| 基金项目： | 内蒙古自治区高等学校科学研究项目 |
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| 摘 要： | 以水合氟化钆为原料,通过TG-DTA热分析法和多因素组合实验法,研究了湿法氟化制备水合氟化钆的脱水机制及其氧的行为。结果表明,水合氟化钆的化学式为GdF3.0.53H2O,83℃前脱去0.2mol结晶水,259℃前脱去0.23 mol结晶水,568℃前脱去0.1 mol结晶水,270℃开始发生水解反应,生成GdOF使氟化钆产物中氧含量增加,除溶解和吸附氧外,O以GdOF形式存在;水合氟化钆脱水过程中加入NH4HF2可降低其氧含量;将水合氟化钆在空气中灼烧后加入8%NH4HF2混合压块,在300℃下充氩保温后进行真空脱水,可获氧含量为0.09%的低氧氟化钆。
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| 关 键 词： | 湿法氟化 氟化钆 氧 行为 |
Dehydration Mechanism and Oxygen Behavior of Hydrous Gadolinium Fluoride by Hydrofluoric Acid Precipitation |
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| HAO Zhan-zhong.Dehydration Mechanism and Oxygen Behavior of Hydrous Gadolinium Fluoride by Hydrofluoric Acid Precipitation[J].Nonferrous Metals(Extractive Metallurgy),2010(5). |
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| Authors: | HAO Zhan-zhong |
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| Abstract: | Dehydration mechanism and oxygen behavior of hydrous gadolinium fluoride was studied by TG-DTA analysis and combinative experiment method.The chemical formula of hydrous gadolinium fluoride is GdF3·0.53H2O,0.2 mol crystal water is removed before 83 ℃,0.23 mol crystal water is removed before 259 ℃,0.1 mol crystal water is removed before 568 ℃.The remaining crystal water reacts with GdF3 to form GdOF at 270 ℃,make oxygen content of gadolinium fluoride products increased,except for dissolved and adsorbed oxygen,O exists in the form of GdOF;added NH4HF2 in hydrous gadolinium fluoride can reduce the oxygen content of products for dehydration process,Roasted hydrous gadolinium fluoride in atmosphere,mix and press one with 8% NH4HF2,constant temperature at 300 ℃ after filled with argon,carry on vacuum dehydration,low oxygen gadolinium fluoride of 0.09% oxygen can be obtained. |
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| Keywords: | Wet fluorination Gadolinium fluoride Oxygen Behavior |
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