Ammonium aluminum sulfate hydroxide[NH4Al（SO4）2·12H2O], the precursor of Al2O3, was prepared with the method of sintering, leaching and adjusting the pH value by using fly ash and ammonium sulfate as raw materi...Ammonium aluminum sulfate hydroxide[NH4Al（SO4）2·12H2O], the precursor of Al2O3, was prepared with the method of sintering, leaching and adjusting the pH value by using fly ash and ammonium sulfate as raw materials.High-purity alumina was prepared by calcining NH4Al（SO4）2·12H2O.The effects of the temperature and time of sintering, molar ratio of（NH4）2SO4 vs the Al2O3 in fly ash and the grain size of fly ash on the extraction efficiency of Al2O3 from fly ash were studied.The efficiency of Al2O3 extraction could reach 95.6 percent under the optimum conditions.The purity of the Al2O3 from calcining NH4Al（SO4）2·12H2O that was refined by recrystallization was higher than 99.9 percent.展开更多
随着我国进入老年化社会,骨质疏松症已经成为严重威胁老年人健康的常见疾病之一。骨质疏松表现为骨量减少,易发生骨折,影像学检查包括 X 线片、CT、MRI、核医学检查和骨密度测量,在骨质疏松症的防治中发挥重要作用。骨质疏松症防治涉及...随着我国进入老年化社会,骨质疏松症已经成为严重威胁老年人健康的常见疾病之一。骨质疏松表现为骨量减少,易发生骨折,影像学检查包括 X 线片、CT、MRI、核医学检查和骨密度测量,在骨质疏松症的防治中发挥重要作用。骨质疏松症防治涉及多学科和多专业合作,但目前缺乏统一的共识,影响学科发展和规范临床服务,为此由来自放射、骨科、内分泌、影像技术和核医学专业专家组成的共识专家组,在充分复习国际指南、共识、文献以及国内最新研究成果的基础上,结合我国医疗实际情况,针对骨质疏松的影像学和骨密度检查技术、诊断标准和鉴别诊断形成共识,为临床医务工作者在骨质疏松的影像学与骨密度临床应用方面提供科学、具体的指导,促进我国骨质疏松的影像学与骨密度诊断规范化发展。展开更多
文摘Ammonium aluminum sulfate hydroxide[NH4Al（SO4）2·12H2O], the precursor of Al2O3, was prepared with the method of sintering, leaching and adjusting the pH value by using fly ash and ammonium sulfate as raw materials.High-purity alumina was prepared by calcining NH4Al（SO4）2·12H2O.The effects of the temperature and time of sintering, molar ratio of（NH4）2SO4 vs the Al2O3 in fly ash and the grain size of fly ash on the extraction efficiency of Al2O3 from fly ash were studied.The efficiency of Al2O3 extraction could reach 95.6 percent under the optimum conditions.The purity of the Al2O3 from calcining NH4Al（SO4）2·12H2O that was refined by recrystallization was higher than 99.9 percent.
文摘随着我国进入老年化社会,骨质疏松症已经成为严重威胁老年人健康的常见疾病之一。骨质疏松表现为骨量减少,易发生骨折,影像学检查包括 X 线片、CT、MRI、核医学检查和骨密度测量,在骨质疏松症的防治中发挥重要作用。骨质疏松症防治涉及多学科和多专业合作,但目前缺乏统一的共识,影响学科发展和规范临床服务,为此由来自放射、骨科、内分泌、影像技术和核医学专业专家组成的共识专家组,在充分复习国际指南、共识、文献以及国内最新研究成果的基础上,结合我国医疗实际情况,针对骨质疏松的影像学和骨密度检查技术、诊断标准和鉴别诊断形成共识,为临床医务工作者在骨质疏松的影像学与骨密度临床应用方面提供科学、具体的指导,促进我国骨质疏松的影像学与骨密度诊断规范化发展。
