INORGANICCHEMICALSINDUSTRY ›› 2011, Vol. 43 ›› Issue (4): 52-.
Previous Articles Next Articles
Li Chen1,Zhang Lei1,Zhang Hongxun1,Chen Fangping1,Wang Songbo2
Published:
Abstract: Calcium in waste calcium carbide residue was extracted with aqueous NH4Cl solution,the obtained solution was purified simultaneously and high purity calcium carbonate was prepared by introducing CO2.Effects of aqueous NH4Cl solution concentration,excessive extent,and reaction temperature etc.on Ca extraction and purification were investigated.When aqueous NH4Cl solution concentration was at 3%~27.11% and NH4Cl excessive extent was at 0~25%,the removal rate of impurity Mg was increased with the increasing of aqueous NH4Cl solution concentration,and was slightly increased with increasing of excessive extent;and the extraction rate of Ca was hardly affected.At 15~70 ℃,the leaching temperature hardly improved the extraction rate of Ca,but Mg removal rate was slightly lowered with the temperature rising.Optimum operation conditions to extract and purify Ca were as follows:aqueous NH4Cl solution concentration was 10% (mass fraction),NH4Cl excessive extent 10%,room temperature,and reaction time was 60 min.Adjust pH of CaCl2 solution to 12.00 with aqueous ammonia solution,and react with CO2,the purity of the obtained CaCO3 was 99.44%,white content was 97.8%,impurity Mg content was 0.015%,and particle size was 500 nm.
Key words: calcium carbide residue, ammonium chloride, calcium carbonate
CLC Number:
TQ132.32
LI Chen, ZHANG Lei, ZHANG Hong-Xun, CHEN Fang-Ping, WANG Song-Bo-. Studies on synthesis of high purity calcium carbonate with calcium carbide residue[J]. INORGANICCHEMICALSINDUSTRY, 2011, 43(4): 52-.
0 / / Recommend
Add to citation manager EndNote|Reference Manager|ProCite|BibTeX|RefWorks
URL: http://www.wjygy.com.cn/EN/
http://www.wjygy.com.cn/EN/Y2011/V43/I4/52