Metastable Dissolution Regularity of Nd3+ in Na2CO3 Solution and Mechanism
Metastable Dissolution Regularity of Nd3+ in Na2CO3 Solution and Mechanism
复制标题
Nd3在Na2CO3溶液中的亚稳态溶解规律及机理
DOI：
10.1021/acsomega.9b00453
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发表时间：
2019
期刊：
影响因子：
4.1
通讯作者：
Li Kaizhong
中科院分区：
文献类型：
--
作者：
Yang Youming;Zhang Xiaolin;Li Liu;Wei Tingmin;Li Kaizhong
碳酸盐溶液溶解的稀土具有一定的亚稳化学特征。本文对Nd ~（3+）在Na_2CO_3溶液中的介稳溶解规律进行了系统的研究。结果表明，Nd 3+在Na 2CO 3溶液中具有瞬时饱和溶解度。当Nd ~（3+）的溶解量未达到瞬时饱和溶解度时，溶液处于稳定状态。当Nd 3+浓度超过瞬时饱和溶解度时，溶液不再处于亚稳态，迅速生成碳酸钕复盐沉淀。对亚稳态溶液进行了分子动力学模拟。在高浓度Na 2CO 3溶液中，溶解的Nd 3+与CO 32-发生配位反应。Na+与CO 32-之间存在较强的相互作用，导致可与Nd 3+反应的游离CO 32-的有效浓度降低。因此，这些原因使得溶液呈现亚稳态。在此介稳阶段，溶解的Nd ~（3+）趋于稳定，不易生成碳酸钕复盐沉淀。
The carbonate solution-dissolved rare earth showed some metastable chemical characteristics. In this paper, the systematic investigation of metastable dissolution regularity of Nd3+in Na2CO3solution was carried out. The results showed that Nd3+has an instantaneous saturated solubility in Na2CO3solution. When the amount of the dissolution Nd3+did not reach the instantaneous saturated solubility, the solution was in a stable-state period. Once the concentration of Nd3+exceeded the instantaneous saturated solubility, the solution was no longer in the metastable state and generated the neodymium double salt of carbonate precipitates rapidly. The molecular dynamics simulation of the solution in the metastable state was carried out. In high concentration Na2CO3solution, dissolved Nd3+had a coordination reaction with the CO32–. Also, there was a stronger interaction between Na+and CO32–, which caused the effective concentration of free CO32–which could react with Nd3+to become lower. Thus, these reasons make the solution exhibit a metastable state. In that metastable period, the dissolved Nd3+becomes steady and hard to generate the neodymium double salt of carbonate precipitates.