| 铁离子对磷酸氢二铵结晶过程的影响 |
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| 引用本文： | 孟祥芮,陈慧萍.铁离子对磷酸氢二铵结晶过程的影响[J].硅酸盐通报,2017,36(7):2249-2253. |
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| 作者姓名： | 孟祥芮 陈慧萍 |
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| 作者单位： | 南昌大学资源环境与化工学院,南昌,330031 |
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| 摘 要： | 首先,采用动态激光法测定了不同铁离子含量的磷酸氢二铵溶液结晶介稳区的宽度;其次,借助倒置显微镜,通过单晶生长法来研究铁离子对磷酸氢二铵晶体生长速率的影响;此外,还通过对产品粒度分布的分析,考察了掺杂铁离子对磷酸氢二铵颗粒大小的影响.实验结果发现:随着铁离子质量浓度百分数由0增加至0.007,结晶介稳区宽度由3.32 ℃增大到7.68 ℃.随着Fe3+质量浓度百分数的增大,单晶各个方向的生长速率都逐渐减小.当Fe3+质量浓度百分数X(Fe3+)=0.005时,在过饱和度(△)C=6 g·(100 g)-1的溶液中,磷酸氢二铵晶体x方向的生长速率Gx由未添加Fe3+时的 60.29 nm·s-1减小为28.35 nm·s-1;平均粒径D50由不加Fe3+时267.1 μm减小到137.6 μm;40～80目的晶体粒子体积分率,由未掺杂时的88.85％减小到48.75％.产品粒度分布的重复性下降.
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| 关 键 词： | 铁离子 磷酸氢二铵 介稳区宽度 晶体生长速率 |
Effect of Fe3+ on Crystallization Process of Diammonium Phosphate |
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| MENG Xiang-rui,CHEN Hui-ping.Effect of Fe3+ on Crystallization Process of Diammonium Phosphate[J].Bulletin of the Chinese Ceramic Society,2017,36(7):2249-2253. |
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| Authors: | MENG Xiang-rui CHEN Hui-ping |
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| Abstract: | First of all,the crystallization metastable zone width of diammonium phosphate(DAP)solution with different contents of iron ions(Fe3+)was determined by dynamic laser method.Secondly,the effect of Fe3+ on the growth rate of DAP was studied by single crystal growth method with inverted microscope.In addition,the effect of Fe3+ on the regularity of DAP particles was investigated by analyzing the particle size distribution.The experimental results show that with the increasing of Fe3+ concentration from 0 to 0.007,metastable zone width increases to 7.68 ℃ from 3.32 ℃,the growth rate of the single crystal in all directions is reduced gradually.When the percentage of iron ion mass concentration X(Fe3+)=0.005,the crystal rate of x direction of diammonium phosphate(Gx)decreases from 60.29 nm·s-1(no adding Fe3+)to 28.35 nm·s-1 in the solution with the degree of supersaturation △C=6 g·(100 g)-1,and the average particle diameter D50 decreases from 267.1 μm(no adding Fe3+)to 137.6 μm and the crystal particle volume fraction of 40-80 mesh is reduced from 88.85％(not adding Fe3+)to 48.75％.The repeatability of the product particle size distribution declines. |
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| Keywords: | Fe3+ diammonium phosphate metastable zone width crystal growth rate |
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