类球状纳米碳酸钙的制备及改性工艺条件研究  

Study on synthesis and modification of spherical-like nanometer calcium carbonate

作　　者：王百年[1] 李强[1] 张胜男[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《化学工业与工程技术》2014年第2期55-60,共6页Journal of Chemical Industry & Engineering

摘　　要：研究了以D-葡萄糖酸钠作为晶形控制剂、石灰乳液碳化法制备类球状纳米碳酸钙的工艺条件,以及十二烷基磺酸钠为改性剂的湿法改性工艺条件.XRD,TEM等表征结果表明：在温度50℃、搅拌转速800 r/min、晶形控制剂质量分数1.5％、Ca（OH）2初始质量分数7％、CO2气体流速60 mL/min时,制备的纳米碳酸钙样品属于方解石型六方晶系,形貌类似球状,粒径均匀（50～100 nm）.吸油量测定结果表明：在改性剂质量分数3.5％、改性温度70℃、改性时间50 min时,改性所得样品吸油量（以100 g计）约44 mL,符合国家工业碳酸钙行业标准（GB/T 19281-2003《碳酸钙分析方法》）一等品的要求[吸油量（以100 g计）小于60 mL].The process conditions to prepare spherical-like calcium carbonate by carbonization method from lime slurry and modification conditions of wet process using sodium dodecyl sulfate as modifying agent are studied using D-sodium gluconateas as crystal controlling agent.The XRD and TEM results show that the as-prepared nanometer calcium carbonate is calcite with hexagonal crystal system and spherical-like with uniform diameter of about 50～ 100 nm when the temperature is 50 ℃,stirring speed is 800 r/min,crystal controlling agent mass fraction is 1.5％,Ca （OH） 2 initial mass fraction is 7％,CO2 gas flow rate is 60 mL/min.The results of oil absorption show that when the mass fraction of modification agent is 3.5％,the temperature of modification is 70 ℃,the modification time is 50 min,the oil absorption of spherical-like nanometer calcium carbonate reaches minimum of about 44 mL/100 g which could meet the first grade standard of national calcium carbonate industry （GB/T 19281-2003） （the oil absorption value should be less than 60 mL/100 g）.

关 键 词：碳化反应 晶形控制剂 类球状碳酸钙 改性 

分 类 号：TQ132.32[化学工程—无机化工]