白云石炼镁收尘灰制备碳酸钙工艺研究  

Study on Preparation of Calcium Carbonate From the Collected Dust of Smelting Magnesium With Dolomite

作　　者：王建军[1] 王博 刘龙治 毛安利 任立庆[1] 温俊峰[2] WANG Jian-jun;WANG Bo;LIU Long-zhi;MAO An-li;REN Li-qing;WEN Jun-feng(School of Energy Engineering,Yulin University,Yulin Shaanxi 719000,China;School of Chemistry and Chemical Engineering,Yulin University,Yulin Shaanxi 719000,China)

机构地区：[1]榆林学院能源工程学院,陕西榆林719000 [2]榆林学院化学与化工学院,陕西榆林719000

出　　处：《当代化工》2023年第1期18-22,35,共6页Contemporary Chemical Industry

基　　金：国家自然科学基金(项目编号:12064046);陕西省榆林市科技局项目(项目编号:2019-kjj045)。

摘　　要：以白云石炼镁收尘灰为原料,利用铵浸-碳化法制备碳酸钙。采用XRD、SEM和EDS对制备的样品进行表征。研究了制备碳酸钙的3个过程中消化水量、消化时间、消化温度、氯化铵浓度、铵浸温度、碳化时间、碳化温度及二氧化碳流速对样品产率影响。得到了制备碳酸钙的最佳工艺:水和炼镁收尘灰的质量比为7∶1、消化温度30℃、消化时间80 min,氯化铵浓度2 mol·L^(-1)、铵浸温度55℃、铵浸时间15 min、二氧化碳流速250mL·min^(-1)、碳化温度30℃、碳化时间9min。最佳工艺下制备的碳酸钙由物质的量比为1∶1的方解石和球霰石两相组成,产率86.62%,纯度97.5%。Calcium carbonate was prepared by ammonium leaching-carbonization method using the collected dust of smelting magnesium with dolomite(CDSMD).The prepared samples were characterized by XRD,SEM and EDS.The effects of quality of slaking water,slaking time,slaking temperature,concentration of NH_(4)Cl,NH_(4)Cl leaching temperature,NH_(4)Cl leaching time,carbonization temperature,carbonization time and the flow rate of CO_(2)on the yield of CaCO_(3)were studied in the slaking,leaching and carbonization process.The best treatment process was determined as follows:the mass ratio of water to collected dust 7∶1,slaking temperature 30℃,slaking time 80 min,NH_(4)Cl concentration 2 mol·L^(-1),NH_(4)Cl leaching temperature 55℃,NH_(4)Cl leaching time 15 min,CO_(2)flow rate 250 mL·min^(-1),carbonization temperature 30℃,carbonization time 9 min.Under these conditions,the prepared calcium carbonate was composed of two phases of calcite and vaterite with the molar ratio of 1∶1,the yield of CaCO_(3)was 86.62%,and the purity was 97.5%.

关 键 词：碳酸钙 产率 消化 铵浸 碳化 

分 类 号：TQ110.6[化学工程—无机化工]