文献类型：期刊文献

英文题名：Study on agglomeration mechanism of ammonium paratungstate pentahydrate and controllable preparation of pure monodisperse crystals

作者：Li, Kangli[1,2];Li, Junjie[1];Peng, Haoyu[1];Liu, Yanbo[1];Wei, Xuemei[3];Shen, Runpu[3];Xu, Shuang[4];Yu, Chunrong[4];Chen, Mingyang[1,2];Zhou, Ling[1];Gong, Junbo[1,2,3]

机构：[1]Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300072, Peoples R China;[2]Tianjin Univ, Zhejiang Inst, Shaoxing 312300, Peoples R China;[3]Shaoxing Univ, Zhejiang Engn Res Ctr Fat Soluble Vitamin, Shaoxing 312000, Zhejiang, Peoples R China;[4]Jiangwu HC Starck Tungsten Prod Co Ltd, Ganzhou 341000, Peoples R China

年份：2024

卷号：438

外文期刊名：POWDER TECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:001299982700001)、、EI(收录号：20241215757790)、Scopus(收录号：2-s2.0-85187666220)、WOS

基金：Kangli Li thanks the Shaoxing People's Government for a supporting of her post-doctoral research. This work was financially supported by the Opening Project of Zhejiang Engineering Research Center of Fat-soluble Vitamin (22278270) , the Key R & D Program of Zhejiang (2022C01208) , the Key R & D Program of Tianjin (21JCZDJC00400) and the National Natural Science Foundation of China (22078234) .

语种：英文

外文关键词：Ammonium paratungstate; Evaporative crystallization; Agglomeration mechanism; Thermal decomposition

外文摘要：Ammonium paratungstate (APT) is an important intermediate for the production of tungsten-containing products. However, its morphology problems caused by crystal agglomeration affect its properties. In this paper, the mechanism of agglomeration during the evaporative crystallization of APT was studied. The experimental result reveals that the temperature, as a critical parameter, significantly affects hydrates purification of crystallization. Combined with on-line and off-line analysis, it is proposed that the crystal agglomeration mainly results from hydrate transformation from heptahydrate to pentahydrate. Furthermore, based on this agglomeration mechanism, the strategy of adding seeds was applied to control the supersaturation within the metastable region and to avoid the nucleation of heptahydrates. The effect of seeds properties, such as the effect of its mass and size on the particle size distribution and agglomeration degree of the products, were investigated in batch crystallization. Finally, we obtained monodisperse crystals of pure APT center dot 5H2O 2 O with better performance.