磷石膏矿化CO2反应体系调控碳酸钙晶型的过程参数研究  

Study on process parameters of mineralization reaction system of CO2 with phosphogypsum to regulate crystal form of CaCO3

作　　者：谢安帝 李季[1] 朱家骅[1] 葛敬[1] 吴林 彭玉凤 卢蔚 XIE Andi;LI Ji;ZHU Jiahua;GE Jing;WU Lin;PENG Yufeng;LU Wei(School of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《磷肥与复肥》2020年第6期5-7,10,共4页Phosphate & Compound Fertilizer

基　　金：国家科技支撑计划(2013BAC12B01)。

摘　　要：磷石膏直接矿化CO2生成碳酸钙与硫酸铵,通过调控CaCO3晶型,可实现磷石膏的高附加值利用.实验研究CaSO4·2H2O-NH3-CO2-H2O三相反应体系过程参数对CaCO3晶型的影响规律.结果表明:当温度>30℃、CO2流量<150 mL/min、w(NH3)<2%时,主要产物为方解石型碳酸钙;在温度为25℃、w(NH3)为8%、CO2流量为250 mL/min时,制备了纯度99%的球形微孔球霰石型碳酸钙,证实了磷石膏矿化CO2反应体系直接制备纯净球霰石的可行性.Using phosphogypsum to mineralize CO2 directly producing calcium carbonate and ammonium sulfate,the high added value utilization of phosphogypsum can be realized by adjusting the crystal form of CaCO3.The effects of process parameters of CaSO4·2 H2 O-NH3-CO2-H2 O three-phase reaction system on the crystal form of CaCO3 are experimentally studied.The results show that when the temperature is higher than 30℃,the flow rate of CO2 is lower than 150 mL/min and the mass concentration of ammonia is lower than 2%,the main product of calcium carbonate is calcite.When the temperature is 25℃,the mass concentration of ammonia is8%,and the flow rate of CO2 is 250 mL/min,the spherical microporous vaterite type calcium carbonate with purity of 99%is prepared,which proves the feasibility of direct preparation of pure vaterite by the phosphogypsum mineralized CO2 reaction system.

关 键 词：磷石膏 碳酸钙 球霰石 CO2矿化 

分 类 号：TQ127[化学工程—无机化工] X786[环境科学与工程—环境工程]