| Nb_2O_5在硫酸中的溶解过程及热力学计算 |
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| 引用本文： | 何起,孙映,李秋菊. Nb_2O_5在硫酸中的溶解过程及热力学计算[J]. 有色金属工程, 2018, 8(5) |
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| 作者姓名： | 何起 孙映 李秋菊 |
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| 作者单位： | 上海大学;省部共建高品质特殊钢冶金与制备国家重点实验室 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 为了提高铌钽矿中铌的溶出率,研究了Nb_2O_5在硫酸中的溶解、反应过程以及酸溶解的热力学条件。利用物量守恒原理计算了整个实验过程中Nb和S的物质流,结合X射线荧光光谱分析(XRF)、X射线电子衍射(XRD)等检测手段,确定了Nb_2O_5在硫酸溶液中的溶解及反应过程和最终产物;利用高温差示扫描量热法(DSC)研究了硫酸溶解Nb_2O_5的热效应,对溶解过程进行了热力学计算,确定了硫酸溶解Nb_2O_5的反应吉布斯自由能。
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| 关 键 词： | 五氧化二铌 物质流 硫酸焙烧 物量守恒 热力学计算 |
| 收稿时间： | 2017-07-25 |
| 修稿时间： | 2017-08-20 |
Dissolution Process and Thermodynamic Calculation of Nb2O5 in Sulfuric Acid |
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| HE Qi,SUN Ying and LI Qiu-ju. Dissolution Process and Thermodynamic Calculation of Nb2O5 in Sulfuric Acid[J]. Nonferrous Metals Engineering, 2018, 8(5) |
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| Authors: | HE Qi SUN Ying LI Qiu-ju |
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| Affiliation: | State Key Laboratory of Advanced Special Steels,Shanghai University,State Key Laboratory of Advanced Special Steels,Shanghai University,State Key Laboratory of Advanced Special Steels,Shanghai University |
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| Abstract: | According to the metallogenic analysis, niobium tantalum ore containing niobium ore phase is the main composition of niobium pentoxide phase. Therefore, the study of the dissolution of niobium pentoxide in acid is of great significance to improve the dissolution rate of niobium in niobium ore. The dissolution and reaction process of niobium pentoxide in sulfuric acid and the thermodynamic conditions of acid dissolution had been discussed in this paper. The dissolution process and final product of niobium pentoxide in sulfuric acid solution were determined by using XRF and XRD, combination of the matter conservation and balance principle and the mass flow of Nb and S in the whole experiment process, And the thermodynamic of the dissolution process and the possibility of dissolution were carried out with DSC. The Gibbs free energy of reaction of sulfuric acid dissolved niobium pentoxide was calculated according to the dissolution heat effect. |
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| Keywords: | Niobium pentoxide mass flow sulfuric acid dissolution thermodynamics calculation |
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