磷石膏
磷酸
碳化作用
化学
核化学
锶
滴定法
氨
碳酸钙
钙
水解
材料科学
无机化学
原材料
有机化学
作者
Jun Ma,Ping Li,Dehua Zhang,Bei Yan,Long Zhou,Ze Cheng Zi
出处
期刊:Applied Mechanics and Materials
[Trans Tech Publications, Ltd.]
日期:2014-09-01
卷期号:628: 115-119
被引量:2
标识
DOI:10.4028/www.scientific.net/amm.628.115
摘要
Phosphogypsum is a by-product of industrial phosphoric acid producing with wet method, a simple and efficient way to produce high quality CaCO 3 by phosphogysum is presented in this work. Calcium in the phosphogypsum converts into Ca (OH) 2 with the addition of NaOH, acid insoluble substances and metal ion which was also separated from calcium in phosphogypsum by HCl and NH 3 ·H 2 O respectively. The purity and whiteness of CaCO 3 produced by the carbonization of purified CaCl 2 solution are 98% and 96%. The optimum mass ratio of phosphogypsum, NaOH and HCl was 25:12:35. Chemical characterization of the resultant CaCO 3 was performed by XRD, SEM, TG and chemical titration method, which indicate that this method is effective in producing spherical CaCO 3 at room temperature, moreover, the purity, whiteness and thermostability of calcium carbonate can meet most of application requirements for industrial CaCO 3 .
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