重量法测定草酸铌中的铌量

文章建立了重量法测定草酸铌中铌量的方法。通过采用正交试验优化了测定的工艺参数，将草酸铌灼烧成五氧化二铌，通过质量的减少测定草酸铌中铌量。该方法的相对标准偏差小于0．4％，通过与不同方法的结果对照，方法的准确度和精密度良好，操作简便快速，易于掌握，完全能够满足生产工艺的需要。     

用于核燃料包复层的含铌锆合金

用于核燃料包复层的有优良的耐腐蚀性的含铌锆合金。包括如下组成：铌0．8％-1．2％(质量分数，下同)、选自铁，钼，铜，和锰的一种或多种元素，含量各是0．1％-0．3％；或铌1．3％-1．8％、锡0．2％-0．5％、一种选自铁，钼，铜，锰的元素，为0．1％-0．3％；或铌1．3％-1．8％、锡0．2％。0．5％、铁0．1％-0．3％、一种选自铬，钼，铜和锰的元素，     

用工业硫酸作反铌液制取生产铌铁用的氢氧化铌试验研究

在HF-H_2SO_4-仲辛醇体系中用工业硫酸代替化学纯硫酸作反萃铌液进行湿冶钽铌,生产的铌液用液氨中和制取氢氧化铌,再经调洗、烘干、煅烧后所得之五氧化二铌完全能满足制作GB-7737-87标准的铌铁。经分离后之钽液制成的K_2TaF_7其质量亦满足钠还原制取各种牌号的钽粉。     

纸上色层重量法测定铌矿和铌渣中五氧化二铌

对包头铌矿、铌渣中五氧化二铌(>5%)的分析过去是采用单宁二次沉淀五氧化二铌重量法测定,但是此方法得到的五氧化二铌沉淀无法与五氧化二钽及一定量的二氧化钛分开,方法存在系统正误差。而铈量滴定法测定铌精矿中的铌[1]方法虽然快速简便,可终点不易观察。本文采用纸上色层重量法测定铌矿、铌渣中的五氧化二铌,可很好地将五氧化二铌与五氧化二钽、二氧化钛分开,并且准确度高,精密度好,满足科研和生产的需要。1　实验部分1 1　主要仪器和试剂色层筒:以两个塑料桶(1000mL)制成10个高约30cm、直径约10cm左右的密封桶;氨中和器:大干燥器的…     

电感耦合等离子质谱法测定氧化钽、氧化铌中钾量和钠量

用氢氟酸、硝酸分解试样，在稀酸介质中以氩等离子体光源离子化，直接用电感耦合等离子质谱法测定氧化钽、氧化铌中钾量和钠量。同时介绍了试验仪器、样品制备、结果计算和分析。该测定方法稳定性好、精度较高，钾钠的相对标准偏差为1．45％～6．5％，加标回收率在98．8％～106．3％之间。     

钢中钒的测定方法试验

本研究了用高氯酸溶样，硝酸破坏碳化物，冒烟后，在磷硫混酸中，再次用高锰酸钾将低价钒氧化成五价。然后用硫酸亚铁铵标准溶液进行滴定。该法采用了快速溶样、两次氧化，测定结果稳定、重现性好。可测定普钢中0．01％-0．5％范围内的钒。     

氯代磺酚C示差分光光度法测定高含量铌

氯代磺酚C是一种灵敏度较高的显色剂,它与铌生成1:1紫色的络合物,由于稳定性和选择性好,往往不必预先分离其它元素即可直接测定,国内已普遍应用于低含量铌的测定。本文着重试验了氯代磺酚C的用量与被测铌量的关系。确定了每毫升0.1％的氯代磺酚C能与110微克左右的五氧化二铌显色,若用示差分光光度法测定,高达700微克的五氧化二铌/50毫升尚符合比耳定律(北京化工厂试剂,其它厂的试剂在示差法中测定的上限较低)。据此拟定的方法可测定含量高达75％的铌合金试样,其准确度能     

专利名称：用于核燃料包覆层的含铌锆合金

用于核燃料包复层的有优良的耐腐蚀性的含铌锆合金。包括如下重量组成：铌0．8％～1．2％、选自铁，钼，铜，和锰的一种或多种元素，含量各是0．1％～0．3％；或铌1．3％～1．8％、锡0．2％～0．5％、一种选自铁，钼，铜，锰的元素，为0．1％～0．3％；或铌1．3％～1．8％、锡0．2％～0．5％、铁0．1％～0．3％、一种选自铬，钼，铜和锰的元素，为0．1％～0．3％；或铌0．3％～1．2％、锡0．4％～1．2％、铁0．1％～0．5％、一种选自钼，铜和锰的元素，为0．1％～0．3％；其余成分为氧600～1400mg／kg；硅80～120mg／kg和其余量的锆。     

氢氟酸法合成氢氧化铌的化学组成分析

以五氧化二铌(Nb2O5)为原料,采用氢氟酸法合成了氢氧化铌。湿产物室温下晾干一周后,分别在65,75,85,95和105℃烘箱中烘12 h得到最终样品。通过傅里叶红外光谱(FTIR)和热重(TG)分析技术对不同样品进行表征。红外分析结果表明,在1404 cm-1处出现了NH4+的特征峰,说明氢氧化铌的分子结构中存在NH4+;在1200 cm-1以下未发现M-OH的特征峰,说明该物质分子中不存在Nb-OH结构;3393 cm-1处的OH的伸缩振动峰和1630 cm-1处的H-O-H的弯曲振动峰可能是由物质中存在的分子水导致的。热重测试结果表明,氢氧化铌分子中的水是以吸附水和分子水这两种形式存在的;不同温度下烘干得到的样品中五氧化二铌的含量随着烘干温度的升高呈现增加的趋势,依次为80.55%,82.24%,83.61%,85.25%,85.84%。结合红外和热重分析,对采用氢氟酸法制备的氢氧化铌提出了较为合理的分子表达式(NH4)xNbO2.5+0.5x·yH2O。进一步通过蒸馏-酸碱滴定法测定出样品中NH3的含量,结合热重分析测得的五氧化二铌的含量,计算得到不同烘干温度下获得的氢氧化铌的分子表达式。从中可以看出随着烘干温度的升高,氢氧化铌中的氨含量几乎不变,而水含量有减小的趋势。因此65～105℃的氢氧化铌的分子表达式可表述为(NH4)0.4NbO2.7·yH2O(0.67≤y≤1.14)。     

电感耦合等离子体质谱法测定高纯五氧化二铌中25种痕量杂质元素

采用电感耦合等离子体质谱法(ICP-MS)测定高纯五氧化二铌中痕量Mg、K、Ca、Cr、Fe时,因质谱干扰严重,从而导致其背景等效浓度值(BEC)较高进而无法准确测定。实验采用氢氟酸-硝酸体系以微波消解方式消解样品,以标准加入法补偿基体效应,控制基体质量浓度为500μg/mL,建立了ICP-MS测定高纯五氧化二铌中包括Mg、K、Ca、Cr、Fe在内的25种痕量杂质元素的分析方法。研究表明:采用屏蔽矩冷等离子体技术,在500μg/mL的五氧化二铌基体溶液中,Na、Mg、Al、K、Ca、Cr、Fe、Cu、Co、Ni、Mn的BEC得到明显改善,尤其是Mg、K、Ca、Cr、Fe的BEC改善效果最为显著,由常规模式下的56.5~194ng/mL降至冷等离子体模式下的0.012~0.203ng/mL;使用经实验室亚沸蒸馏提纯的电子级氢氟酸及硝酸可有效地降低试剂空白值。各元素校准曲线线性相关系数均大于0.9990;方法中各元素的检出限在0.001~0.010μg/g之间,测定下限在0.003~0.033μg/g之间。采用实验方法对高纯五氧化二铌样品中25种杂质元素进行测定,结果表明,各元素测定结果的相对标准偏差(RSD,n=11)为0.90%~12.7%,回收率为91%~111%。方法应用于两批纯度为99.999%的超高纯五氧化二铌实际样品分析,结果与辉光放电质谱法(GD-MS)基本一致。     

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.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.