碳酸化Na3VO4溶液分步沉淀NH4VO3和NaHCO3的热力学模拟

扫码查看

原文链接

万方数据

中文摘要：通过热力学模拟,设计了基于调节正钒酸钠溶液的碳酸化以分步沉淀偏钒酸铵和碳酸氢钠的新工艺.首先,利用Bromley-Zemaitis活度系数模型建立含钒酸盐和碳酸盐的水溶液中V(Ⅴ)的化学形态新模型.然后,进行常压或高压碳酸化过程的热力学平衡计算,以揭示钒、碳、钠和杂质的行为.为了保证钒产品的纯度和收率,正钒酸钠溶液先碳酸化至pH值为9.3～9.4,然后加入碳酸铵得到偏钒酸铵沉淀.沉钒后溶液深度碳酸化至最终pH值为7.3～7.5,以沉淀碳酸氢钠,剩余溶液返回用于溶解正钒酸钠晶体.最后,验证实验表明,溶液中99.1％的钒和91.4％的钠分别以偏钒酸铵和碳酸氢钠的形式得到回收.

外文标题：Thermodynamic simulation of stepwise precipitation of NH4VO3 and NaHCO3 from carbonating Na3VO4 solution

外文摘要：Thermodynamic simulation was conducted to design a new process of stepwise precipitating NH4VO3 and NaHCO3 from regulating the CO2 carbonation of Na3VO4 solution.Firstly,a new(V)Ⅴspeciation model for the aqueous solution containing vanadate and carbonate is established by using the Bromley-Zemaitis activity coefficient model.Subsequently,thermodynamic equilibrium calculations are conducted to clarify the behavior of vanadium,carbon,sodium,and impurity species in atmospheric or high-pressure carbonation.To ensure the purity and recovery of vanadium products,Na3VO4 solution is initially carbonated to the pH of 9.3-9.4,followed by precipitating NH4VO3 by adding(NH4)2CO3.After vanadium precipitation,the solution is deeply carbonated to the final pH of 7.3-7.5 to precipitate NaHCO3,and the remaining solution is recycled to dissolve Na3VO4 crystals.Finally,verification experiments demonstrate that 99.1％of vanadium and 91.4％of sodium in the solution are recovered in the form of NH4VO3 and NaHCO3,respectively.

外文关键词：

thermodynamicssodium orthovanadatespeciation modelcarbonationvanadium precipitationsodium bicarbonate

作者：

孟凡成、王永超、柴鑫、刘亚辉、王丽娜、陈德胜

展开 >

作者单位：

中国科学院过程工程研究所战略金属资源绿色循环利用国家工程研究中心,北京 100190

中国科学院大学化学工程学院,北京 101408

关键词：

热力学正钒酸钠化学形态模型碳酸化沉钒碳酸氢钠

基金：

National Natural Science Foundation of ChinaStrategic Priority Research Program of the Chinese Academy of SciencesNational Key Research and Development Program of China

项目编号：

22078343XDA04301032018YFC1900502

出版年：

2024

DOI：

10.1016/S1003-6326(24)66615-X

中国有色金属学报(英文版)

中国有色金属学会

中国有色金属学报(英文版)

CSTPCD

影响因子：1.183

ISSN：1003-6326

年,卷(期)：2024.34(10)