以鹤壁某燃用高硫煤电厂产生的脱硫石膏为原料,通过氯化铵盐溶液溶解脱硫石膏,在石膏浸出滤液中加入氨水,通入模拟电厂烟气制备微纳米CaCO_(3)。在提取过Ca^(2+)的滤液中加入金属氯化物与SO_(4)^(2-)结合,形成微纳米XSO_(4)沉淀。实验...以鹤壁某燃用高硫煤电厂产生的脱硫石膏为原料,通过氯化铵盐溶液溶解脱硫石膏,在石膏浸出滤液中加入氨水,通入模拟电厂烟气制备微纳米CaCO_(3)。在提取过Ca^(2+)的滤液中加入金属氯化物与SO_(4)^(2-)结合,形成微纳米XSO_(4)沉淀。实验结束后,残余液体仍然为氯化铵溶液,且可循环用于下一次浸出。利用XRD和SEM对样品进行测试。结果表明,制备的碳酸钙是球霰石和方解石的混合晶体,晶粒尺寸为微纳米级,纯度近100%;制得的XSO_(4)晶粒尺寸亦为微纳米级,纯度近100%。通过计算,理论上每吨脱硫石膏可以固定135 kg CO_(2),产生307 kg微纳米碳酸钙,制备718 kg微纳米硫酸盐。该研究为电厂烟气不经捕集而直接利用提供了新途径,将减少高额的CO_(2)捕集费用,为脱硫石膏的资源化利用和碳减排提供一种可商业化运行的途径。展开更多
本文通过配合物转化法,采用有机体系,以氢氧化钙为原料,经络合反应、重结晶及真空高温脱结晶水得到高纯的二苯基丙二酮钙络合物,进而利用该络合物与氟氢化铵反应制备出高纯无水氟化钙。通过差热分析、透射电镜、X射线衍射、电感耦合等...本文通过配合物转化法,采用有机体系,以氢氧化钙为原料,经络合反应、重结晶及真空高温脱结晶水得到高纯的二苯基丙二酮钙络合物,进而利用该络合物与氟氢化铵反应制备出高纯无水氟化钙。通过差热分析、透射电镜、X射线衍射、电感耦合等离子体质谱、氧分析仪等手段对制备的氟化钙进行了分析和表征,证明了该方法可以制得纯度高、无水、氧含量低、结晶度高的氟化钙,有效避免了传统“干法”制备的反应条件苛刻、易引入杂质以及“湿法”制备的氧含量高、产物难以过滤的问题,是一种绿色高效新颖的制备方法,为高纯氟化盐这一大类化合物的制备提供了一种新的方法和思路。In this paper, the complex conversion method was adopted. Using calcium hydroxide as raw material in organic system, high-purity diphenylpropylene glycol calcium complex was obtained by complex reaction, recrystallization and vacuum high temperature decrystallizing water, and then high-purity anhydrous calcium fluoride was prepared by reaction of the complex with ammonium hydroxide. By differential thermal analysis, transmission electron microscopy, X-ray diffraction, inductively coupled plasma mass spectrometry and oxygen analyzer, the prepared calcium fluoride was analyzed and characterized. It was proved that the method can obtain calcium fluoride with high-purity, anhydrous, low oxygen content and high crystallinity. Effectively avoiding the problems of harsh reaction conditions, easy introduction of impurities by traditional “dry” preparation process, and high oxygen content and difficult filtration of products by traditional “wet” preparation process. It is a green, efficient and novel preparation method, which provides a new method and idea for the preparation of high purity fluoride salt.展开更多
文摘以鹤壁某燃用高硫煤电厂产生的脱硫石膏为原料,通过氯化铵盐溶液溶解脱硫石膏,在石膏浸出滤液中加入氨水,通入模拟电厂烟气制备微纳米CaCO_(3)。在提取过Ca^(2+)的滤液中加入金属氯化物与SO_(4)^(2-)结合,形成微纳米XSO_(4)沉淀。实验结束后,残余液体仍然为氯化铵溶液,且可循环用于下一次浸出。利用XRD和SEM对样品进行测试。结果表明,制备的碳酸钙是球霰石和方解石的混合晶体,晶粒尺寸为微纳米级,纯度近100%;制得的XSO_(4)晶粒尺寸亦为微纳米级,纯度近100%。通过计算,理论上每吨脱硫石膏可以固定135 kg CO_(2),产生307 kg微纳米碳酸钙,制备718 kg微纳米硫酸盐。该研究为电厂烟气不经捕集而直接利用提供了新途径,将减少高额的CO_(2)捕集费用,为脱硫石膏的资源化利用和碳减排提供一种可商业化运行的途径。
文摘本文通过配合物转化法,采用有机体系,以氢氧化钙为原料,经络合反应、重结晶及真空高温脱结晶水得到高纯的二苯基丙二酮钙络合物,进而利用该络合物与氟氢化铵反应制备出高纯无水氟化钙。通过差热分析、透射电镜、X射线衍射、电感耦合等离子体质谱、氧分析仪等手段对制备的氟化钙进行了分析和表征,证明了该方法可以制得纯度高、无水、氧含量低、结晶度高的氟化钙,有效避免了传统“干法”制备的反应条件苛刻、易引入杂质以及“湿法”制备的氧含量高、产物难以过滤的问题,是一种绿色高效新颖的制备方法,为高纯氟化盐这一大类化合物的制备提供了一种新的方法和思路。In this paper, the complex conversion method was adopted. Using calcium hydroxide as raw material in organic system, high-purity diphenylpropylene glycol calcium complex was obtained by complex reaction, recrystallization and vacuum high temperature decrystallizing water, and then high-purity anhydrous calcium fluoride was prepared by reaction of the complex with ammonium hydroxide. By differential thermal analysis, transmission electron microscopy, X-ray diffraction, inductively coupled plasma mass spectrometry and oxygen analyzer, the prepared calcium fluoride was analyzed and characterized. It was proved that the method can obtain calcium fluoride with high-purity, anhydrous, low oxygen content and high crystallinity. Effectively avoiding the problems of harsh reaction conditions, easy introduction of impurities by traditional “dry” preparation process, and high oxygen content and difficult filtration of products by traditional “wet” preparation process. It is a green, efficient and novel preparation method, which provides a new method and idea for the preparation of high purity fluoride salt.
