共查询到20条相似文献,搜索用时 109 毫秒
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通过电感耦合等离子体原子发射光谱法对铬铁矿中三氧化二铬含量进行定量分析,在测量过程中,对影响定量分析结果的不确定度分量包括重复性试验、称样量、定容体积、标准溶液的配制、曲线拟合、氧化物换算系数等进行分析,并对各影响因素的不确定度进行计算和合成,最后获得铬铁矿中三氧化二铬的扩展不确定度.测量不确定度的评定结果表明:影响不... 相似文献
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火焰原子吸收分光光度法测定矿石样品中银的不确定度评定 总被引:9,自引:1,他引:9
文中对火焰原子吸收分光光度法测定矿石样品中银的不确定度进行了评定,测量结果的不确定度由称样质量、标准工作溶液、工作曲线拟合、试液定容体积等引入的不确定度分量组成。在对各个不确定度分量进行量化的基础上,通过合成得到测量结果的标准不确定度,并确定影响银含量测量不确定度的主要分量是工作曲线拟合引入的不确定度。 相似文献
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为了在“全三脱”工艺流程中实现炉渣的高效循环利用,将[w((P2O5))]较低的热态脱碳炉终渣通过渣罐兑入脱磷炉继续发挥脱磷作用。分析结果表明,提高返回渣量及脱磷渣磷分配比均可显著降低脱磷炉石灰消耗量,当渣钢磷分配比及返回渣量控制合适时,脱磷炉可不加入石灰而使半钢磷质量分数达到目标值。对脱碳炉渣在脱磷炉冶炼中的再熔化过程进行计算分析,随着铁水中硅元素的氧化,脱碳渣碱度降低而不断熔化,逐渐发挥脱磷作用。在“全三脱”工艺流程中成功开发了转炉渣热态循环利用工艺,脱磷率提高约6%,返回脱碳渣加入量约为67.13 kg/t,石灰、轻烧白云石和萤石分别节约9.37、1.15 和2.45 kg/t,半钢温度提高约7 ℃。 相似文献
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针对赣南离子型稀土开发现状,根据环境保护“十五”计划实现低劣转化的要求,提出推广高新技术,强化清洁生产管理,引入绿色环保税制等措施,解决赣南稀土开发生态环境保护问题,促进资料优势向经济优势转化,走可持续发展道路。 相似文献
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近年来随着质量体系认证,实验室认可体系在中国不断展开,统计技术作为一种控制手段被应用于化验室检测控制。本文通过建立载金炭中金含量值的 x-R控制图,对检测数据进行统计分析,使检测结果得到有效控制。 相似文献
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在金的光度分析测定研究中,追溯其显色剂的源头,对研究金的光度分析进展具有重要意义;同时,对原有显色剂分子的改进,对分析功能团的修饰,新的分析显色体系的提出,以及合成或发现新显色剂,同样具有重要作用和诱人的前景。通过文献检索,找出了中国光度法测定金的70多种显色剂的研究和应用,并将其分类介绍,以期对该领域进一步探索、改进和开拓。 相似文献
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陈希颖 《中国稀土学报(英文版)》1992,(1)
Application of rare earth in steels has gone through three stages in China.The investigation of rare earthadding method begun at the late 1970's has solved the technical problems caused by rare earth addition.Controlling sulphide morphology,several rare earth treated steel grades with improved properties have been developedand put into production.Rare earth exerts remarkable effect on the performance of low sulphur steel and on thehydrogen behavior in steel.Rare earth used for surface treatment of iron and steel materials expands rare earthutilization. 相似文献
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Morteza N. Orang J. Scott Matyac Richard L. Snyder 《Canadian Metallurgical Quarterly》2008,134(1):96-100
Reliable information on irrigation methods is important for determining agricultural water demand trends. Therefore, a study was conducted during 2002 to collect information on irrigation methods that were used by growers to irrigate their crops in 2001. The results were compared to earlier surveys to assess trends in cropping and irrigation methods. A one-page questionnaire was developed to collect information on irrigated land by crop and irrigation methods. The questionnaire was mailed to 10,000 growers in California that were randomly selected from a list of 58,000 growers by the California Department of Food and Agriculture, excluding rice, dry-land, and livestock producers. From 1972 to 2002, the area planted has increased from 15 to 31% for orchards and from 6 to 16% for vineyards. The area planted to vegetables has remained relatively static, while that planted to field crops has declined from 67 to 42% of the irrigated area. The land irrigated by low-volume (drip and microsprinkler) irrigation has increased by about 33%, while the amount of land irrigated by surface methods has decreased by about 31%. Sprinkler usage has decreased in orchards and vineyards, but it has increased in vegetable crops. 相似文献