红外吸收法测定硫含量的测量不确定度评定

依据ISO4935《高频炉内燃烧后红外吸收法测定钢铁中的硫量》方法，对钢铁中硫含量的测量不确定度进行了分析和评定，测量不确定度主要来源于仪器示值引入的测量不确定度。标准物质的引入及工作曲线的建立也是不确定度来源的重要因素之一。     

脉冲熔融还原-红外吸收法测定电解铁粉中氧含量的不确定度评定

按照分析测试中测量不确定度的方法程序,结合氧分析仪的测量分析原理,对脉冲熔融还原-红外吸收法测定电解铁粉中氧含量的不确定度进行了评定。通过测量过程分析、建立数学模型,计算出了各不确定度分量,测量重复性引起的相对标准不确定度为0.002 360、标准物质引起的相对标准不确定度为0.000 188、仪器校准引起的相对标准不确定度为0.000 584、样品称量引起的相对标准不确定度为0.004 350、仪器示值引起的相对标准不确定度很小可忽略不计,求得扩展不确定度为0.000 490%,脉冲熔融还原-红外吸收法测定电解铁粉中的氧含量结果表示为:W_M=(0.048 800±0.000 490)%,k=2。为电解铁粉氧含量测定的准确性提供了理论基础。     

红外吸收法测定硅铁中碳含量不确定度的评定

依据高频红外碳硫分析仪的工作原理及GB/T 4333.10-2019标准硅铁中碳含量的测定方法要求,针对低w(C)段（0.006 0%～0.025%）硅铁的测量建立数学模型,从样品测量重复性、有证标准物质的不确定度、校准时测量变动、试样称量、仪器显示等多方面评定红外吸收法测定硅铁中碳含量的合成不确定度,并给出评定结果。     

S400G中硫含量检测的不确定度评定

测量不确定度是反映被测量值的分散性、与测量结果相联系的参数,是对测量结果质量的定量表征。结合宝钢特钢检测中心炼钢炉前分析作业区的生产实际,依照国标GB/T 20123—2006,运用高频燃烧红外吸收法对S400G中硫含量进行分析,对样品的测量重复性分量、校正时测量变动性分量进行了A类不确定度评定,对标准物质硫含量分量、称量引起的分量、仪器显示分辨率的分量分别进行了B类不确定度评定,明确了评定过程所需参数的数据采集和计算方法。结果表明,采用高频燃烧红外吸收法的检测可信度较高,同时也为其他钢种的高硫含量测量评定提供了参考依据。     

红外吸收法测定生铁中碳、硫含量的不确定度评定

按照分析测试中测量不确定度及评定的方法程序,对利用CS-902T红外碳硫仪测定生铁中碳、硫含量时重复测量、标准物质、电子天平、分析仪、工作曲线拟合等引入的不确定度分量进行了评定,计算出的碳和硫的合成不确定度分别为0.0136和0.00146,有效自由度分别为164.7和253.0,扩展不确定度分别为0.022和0.0024,碳和硫的测定结果可分别表示为(3.827±0.022)%和(0.0436±0.0024)%。     

红外吸收法测定钢铁中碳含量的测量不确定度评定

通过对红外吸收法测定钢铁中碳含量的各种不确定度因素进行分析,评定了测定碳含量的测量不确定度,从而明确了提高分析准确度的方法。     

高频红外吸收法测定钨精矿中硫量的不确定度评定

研究采用了高频红外吸收法测定钨精矿中的硫含量,采用数学模型分析法确定了检测样品中不确定度的主要来源,并对标准物质、重复性的测定、分析仪器、助熔剂及瓷坩埚等各环节的不确定度分量进行了计算,得到钨精矿中硫含量的合成标准不确定度及扩展不确定度。结果表明:所测试钨精矿样品中硫含量的检测结果为0.24%,相对扩展不确定度为0.009 2%(k=2),最终得出影响不确定度的主要因素是标准物质,为实验室的质量控制提供了参考依据。     

硅锰合金中碳含量的红外吸收法测量不确定度评定

对红外吸收法测定硅锰合金中碳含量的测定过程中不确定度的主要来源进行了识别,从被测样品的测量重复性、标准物质定值、校准曲线的变动性、称量等方面引入的不确定度分量进行了分析与合成,得出硅锰合金中碳含量测量结果不确定度表示为:c(C)=(1.553±0.019)%,k=2。     

红外法测定钛合金样品中碳含量的不确定度评定

本文对高频红外法测定钛合金中碳含量的检测结果进行了不确定度评定,通过对样品检测过程的不确定分量的分析和量化评定,求出了碳含量的标准不确定度和扩展不确定度,最后提出了减小测量不确定度的方法。     

分析测试中测量不确定度及评定 第四部分 实例(3)测定钢中碳量的不确定度评定

讨论和比较了红外吸收法和燃烧气体容量法测定钢中碳量的各种不确定度因素,并评定了两种方法测定碳量的测量不确定度。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.