利用X-射线荧光光谱仪分析铁矿石中若干元素

本文介绍了用偏硼酸锂(33%)和四硼酸锂(67%)混合助熔剂熔融制样,加补钴粉做内标,采用X-射线荧光光谱法定量测定铁矿石中的TFe,SiO2,CaO,MgO,Al2O3,P,S含量,经大量实践数据证明,完全符合误差要求,精密度高,准确度可靠,不仅大大缩短了分析时间,提高了工作效率,而且降低了劳动强度.     

X射线荧光光谱法测定镁砂中的主要元素

介绍了采用X射线荧光光谱法测定镁砂中的SiO2、CaO、MgO、Fe203、Al2O3等元素的方法。采用将灼烧后的样品与四硼酸锂混合在高温条件下熔融成片，用x射线荧光光谱仪测定，分析结果的精密度、准确度高，分析速度快，适合于大批量进厂原料的检验工作。     

X-射线荧光光谱法测定硅石中主次成分

采用硅石标准样品及其复配标准样品作为校准样品,建立了熔融制样X-射线荧光光谱法测定硅石中SiO2,Fe2O3,Al2O3,CaO,MgO,K2O,TiO2,MnO,P2O5主次成分的方法。采用熔融法为试料片和校准片的制备方法,通过试验选择四硼酸锂-偏硼酸锂混合熔剂(12∶22,m/m)为助熔剂、1.00 mL LiBr溶液为脱模剂、稀释比为1∶20、熔融时间30 min。采用可变理论α系数对基体效应进行校正。对同一硅石样品进行测定的相对标准偏差(RSD)小于8%,对不同硅石样品进行测定,本法的测定结果与标     

熔融玻璃片法X射线荧光光谱测定铁矿石中的主次量组分

采用四硼酸锂和偏硼酸锂混合熔剂(质量比为67∶33)为助熔剂制备玻璃片,建立了X射线荧光光谱法测定铁矿石中Fe2O3、SiO2、Al2O3、CaO、MgO、P、Ti、K2O、Mn等组分含量的方法。以12个铁矿石的标准物质建立校准曲线,研究了溶剂、稀释比例、脱模剂以及温度和时间的影响,用理论α系数法进行回归校正。方法准确、快速、简便。     

X射线荧光熔融法测定锆质引流剂成分

以四硼酸锂和碳酸锂为助熔剂,采用高温熔融制样,X-射线荧光光谱法对锆质引流剂中的SiO2、Cr2 O3、Fe2 O3、Al2 O3和MgO含量进行了测定.确定了试样与熔剂以1:35的稀释比,以4滴300 g/L溴化铵溶液为脱模剂,在1050℃熔融20 min,熔融制得的玻璃熔片均匀、透明、无气泡,符合测定要求.同时验证...     

熔融制样-X射线荧光光谱法测定钛铁中钛硅锰磷铝

熔融制样-X射线荧光光谱法测定钛铁合金中化学成分,核心技术是合金试样氧化技术,以有效避免样品熔融过程中铂-金坩埚受到侵蚀.在石墨垫底的瓷坩埚内以专用助熔剂将钛铁样品氧化成钛铁熔球,以四硼酸锂与碳酸锂混合熔剂熔融制备成玻璃片,建立X射线荧光光谱法(XRF)测定钛铁中钛、硅、锰、磷、铝含量的方法.试验探讨了熔剂选择、助熔剂...     

X-射线荧光光谱法与红外吸收法联合测定萤石中氟化钙

采用四硼酸锂熔融样品,制成玻璃体熔片,然后用X-射线荧光光谱法测得熔片中总钙含量,减去通过用红外吸收法测得样品中碳含量,换算得到CaCO3中的钙含量,进一步求得萤石中CaF2含量。此方法简便、准确,CaF2含量测得范围广,应用到质量分数为20%~98%氟化钙的测定,测定值与认定值和化学法测定值吻合,最大标准偏差为0.5%,方法能满足日常分析要求。     

熔融制样-X射线荧光光谱法测定镧铈镨钕稀土合金

样品采用硝酸溶解,加入氨水将待测物沉淀,用无灰滤纸过滤,滤渣经过灼烧后用四硼酸锂和偏硼酸锂混合熔剂熔制成试料片,以波长色散X射线荧光光谱仪进行检测,实现了熔融制样-X射线荧光光谱法测定镧铈镨钕稀土合金中镧、铈、镨、钕的含量。以高纯物质配制校准标样,并分别采用干扰系数法进行谱线重叠干扰校正和可变理论α影响系数法(COAL模式)进行基体效应校正。对方法的精密度和回收率进行考察,相对标准偏差(RSD,n=11)小于2%,回收率介于98%~101%之间。对镧铈镨钕稀土合金实际样品进行分析,测定结果同电感耦合等离子体原子发射光谱法的结果相一致。     

X射线荧光光谱法测定氧化锆质耐火材料中主次成分

以无水四硼酸锂和碳酸锂混合熔剂作熔剂,采用玻璃熔片法制样,建立了测定氧化锆质耐火材料中ZrO2、HfO2、Al2O3、SiO2、Fe2O3、TiO2、CaO、MgO、Y2O3等组分的X射线荧光光谱法(XRF)。根据氧化锆质耐火材料中主次成分含量范围,采用有证参考物质和具有成分含量梯度并经其他方法定值的自制标准样品绘制校准曲线。并对熔剂选择、熔融条件及基体效应校正进行了探讨。将X射线荧光光谱法用于3个稳定氧化锆试样的分析,并与ICP-AES法进行比对,测试结果吻合。     

X-射线荧光光谱法测定磷矿中五氧化二磷、氧化钙、三氧化二铁、氧化铝、氧化镁和二氧化硅

采用四硼酸锂和偏硼酸锂混合熔剂[m(Li2B4O7)∶m(LiBO2)=12∶22]熔融磷矿样品制成玻璃样片,用波长色散X-射线荧光光谱仪测定样片中P2O5,CaO,Fe2O3,Al2O3,MgO和SiO2含量。用磷矿标样经同法测定并对测定结果进行理论α系数校正后绘制工作曲线。用本法对一试样测定11次,得到各组分的相对标准偏差小于1.2%。本法已用于磷矿样品分析,测定结果与化学法一致。     

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.