大型综合医院整体迁建项目中医疗设备配置管理实践

在大型综合医院迁建项目中,医疗设备配置规划管理工作是一项重要内容。结合首都医科大学附属北京天坛医院迁建前后医疗设备配置实践,从医疗设备配置规划管理原则、具体方案,以及方案实施过程中的经验和建议3个方面,阐述了医院迁建项目中医疗设备配置规划管理工作的详细内容,并结合当前医疗设备配置规划的热点问题提出建议。

PDCA循环法对医疗设备计量检定覆盖率的影响分析

目的:探究戴明循环法(PDCA循环法)用于医疗设备计量检定中对提高检定覆盖率的影响。方法:运用PDCA循环法分析医疗设备计量检定工作中人员、管理、制度和流程4方面的问题,并有针对性地制定出解决方案,检定工作完成后采用随机抽查方式,抽取2015-2017年6种被抽查设备的计量检定数量和计量检定覆盖率对比。结果:被抽查设备2015-2017年的计量覆盖率由2015年的46.50%提高至2017年的97.50%,2015年与2016年、2016年与2017年和2015年与2017年比较,其差异有统计学意义(x2=11.357,x2=7.826,x2=8.144;P<0.05);被抽查设备的计量检定数量逐年增加,2015年与2016年、2016年与2017年和2015年与2017年比较,其差异有统计学意义(t=18.982,t=16.144,t=15.037;P<0.05)。结论:PDCA循环法能提高医疗设备计量检定覆盖率,可为医疗设备的安全和有效使用提供保障。

Cyclic metallurgical process for extracting Ⅴ and Cr from vanadium slag: Part Ⅰ. Separation and recovery of Ⅴ from chromium-containing vanadate solution

The separation and recovery of V from chromium-containing vanadate solution were investigated by a cyclic metallurgical process including selective precipitation of vanadium,vanadium leaching and preparation of vanadium pentoxide.By adding Ca(OH)_(2) and ball milling,not only the V in the solution can be selectively precipitated,but also the leaching kinetics of the precipitate is significantly improved.The precipitation efficiency of V is 99.59%by adding Ca(OH)_(2) according to Ca/V molar ratio of 1.75:1 into chromium-containing vanadate solution and ball milling for 60 min at room temperature,while the content of Cr in the precipitate is 0.04%.The leaching rate of V reaches 99.35%by adding NaHCO_(3) into water according to NaHCO_(3)/V molar ratio of 2.74:1 to leach V from the precipitate with L/S ratio of 4:1 mL/g and stirring for 60 min at room temperature.The crystals of NH_(4)VO_(3) are obtained by adjusting the leaching solution pH to be 8.0 with CO2 and then adding NH_(4)HCO_(3) according to NH_(4)HCO_(3)/NaVO_(3) molar ratio of 1:1 and stirring for 8 h at room temperature.After filtration,the crystallized solution containing ammonia is reused to leach the precipitate of calcium vanadates,and the leaching efficiency of V is>99%after stirring for 1 h at room temperature.Finally,the product of V_(2)O_(5) with purity of 99.6%is obtained by calcining the crystals at 560℃ for 2 h.

Separation and recovery of Ni from copper electrolyte by crystallization of nickel ammonium sulfate double salt

The separation and recovery of Ni from the copper electrolyte by crystallization of nickel ammonium sulfate double salt were studied.It is found that the solubility of copper sulfate at the same temperature is less than that of nickel sulfate,while the solubility of copper ammonium sulfate is greater than that of nickel ammonium sulfate.So,by adding(NH_(4))_(2)SO_(4),the Ni can be selectively crystallized from the copper electrolyte.By adding(NH_(4))_(2)SO_(4)at the molar ratio of(NH_(4))_(2)SO_(4)/NiSO_(4)≤0.8,and crystallizing at−15℃for 10 h,the Ni in the copper electrolyte can be crystallized in the form of Ni(NH_(4))_(2)(SO_(4))_(2)×6H_(2)O.The qualified product of NiSO_(4)×6H_(2)O can be obtained by pyrolyzing the crystals,dissolving the pyrolysis product in water,and then concentrating the dissolved solution for crystallization.The method of double salt crystallization is a clean,environmentally-friendly,cost-effective and efficient method for separating and recovering nickel from copper electrolyte.

钒渣提钒工艺过程钒铬分离现状及展望

介绍了钒渣提钒工艺过程钒铬的分离回收现状,分析了现行钒铬分离回收工艺的优缺点。结合钒铬分离回收研究取得的最新进展,指出钒渣提钒工艺改进的方向是在获得钒铬合格产品的同时,实现主要化工原料及水在工艺过程的循环利用,进一步节能减排。

循环冶金工艺的开发与应用

循环冶金工艺是指,既可经济高效提取有价金属,又能实现工艺过程所用的化工原料及水的循环利用的冶金工艺,是从源头上减少或避免"三废"产生的冶金工艺。随着国家经济转型发展,生态文明建设及环境保护工作的深入进行,冶炼行业面临严峻的挑战,许多传统冶金工艺不得不转型升级。以钒渣提钒液分离回收钒铬及碳酸钠,硝酸退镀液分离回收铜和硝酸,及铜电解液自净化分离回收砷、锑、铋为例,介绍循环冶金工艺的开发与应用。