氯化铵焙烧生石灰提取可溶性钙  

Extracting Soluble Calcium from Roasting Quicklime with Ammonium Chloride

作　　者：宁志强 桑椿媛 谢宏伟 宋秋实 NING Zhi-qiang;SANG Chun-yuan;XIE Hong-wei;SONG Qiu-shi(School of Metallurgy,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学冶金学院

出　　处：《东北大学学报（自然科学版）》2019年第10期1419-1423,共5页Journal of Northeastern University(Natural Science)

基　　金：国家重点基础研究发展计划项目(2014CB643405)

摘　　要：为实现生石灰的高附加值利用,采用水浸氯化铵与生石灰的焙烧熟料提取氧化钙,考察了焙烧温度、焙烧时间及铵矿物质量的比对生石灰中氧化钙提取率的影响.通过正交试验,确定了最佳提取氧化钙焙烧条件.研究结果表明:最佳的焙烧工艺为焙烧温度250℃,焙烧时间90 min,铵矿物质的量比2.2∶1,此时,氧化钙的提取率可达97.26%.利用差热法进行了机理分析,结果表明氯化铵焙烧生石灰过程总体分三个化学反应步骤.The calcium oxide was extracted by aqueous leaching roasted clinker of ammonium chloride and quicklime,and the effects of the roasting temperature,roasting time and molar ratio of ammonium chloride to quicklime on the extraction ratio of calcium oxide were studied to achieve a high value-added utilization for quicklime.The optimum roasting condition for extracting calcium oxide was obtained through the orthogonal tests.The results indicate that when the roasting temperature is 250℃,the roasting time is 90min,and the mole ratio of ammonium chloride to quicklime is 2.2∶1,the optimum roasting process can be achieved and the extraction ratio of calcium oxide is up to 97.26%.After differential thermal analysis,the process of roasting quicklime with ammonium chloride can be generally divided into three steps.

关 键 词：氯化铵 石灰石 生石灰 氧化钙 氯化钙 

分 类 号：TF111[冶金工程—冶金物理化学]