锶的经济地位值得重视

锶是碱土金属，是地壳中含量较多的元素。但锶在地壳中的含量与钙、镁相比，还是较少的。再加上锶的化合物的实际应用不及钙和镁的化合物广泛，因此锶比钙和镁金属相比化被人类认识的较晚。锶是碱土金属中丰度最小的元素，主要的矿物有天青石和碳酸锶矿。     

偶氮胂Ⅲ光度法测定钢中微量锶

微量锶的吸光光度法国内报导甚少。资料报导用偶氮肿Ⅲ吸光光度法测定碱土金属,方法选择性差。我们采用偶氮胂Ⅲ作锶的显色剂,研究了如何提高方法的选择性。提出了在钙、镁、锶、钡混合液中测定微量锶的方法。     

偶氮胂Ⅲ光度法测定锶硅铁中锶

加乙酸钠于试样制备的溶液中,加热水解,基体元素生成碱式盐沉淀与锶钙镁分离,以 DCTA 掩蔽钙镁,锶与偶氮胂Ⅲ显色.测定结果满意.     

铬变酸2R光度法分析铸铁及球墨铸铁中镁

采用铜试剂分离其干扰元素后，在乙醇介质中铬变酸2R与Mg^2＋生成紫红色络合物，借此可在波长560nm处，测定镁含量在0．01％～0．06％球墨铸铁中镁。     

钡锶存在下钙镁连续络合滴定的新方法研究

目前高含量钙,镁化学分析一般均采用络量法。锶,钡,钙,镁因其化学性质相似,共生现象普遍。在其络合滴定测定中由于相互干扰严重,往往辅以较为复杂的分离手续。迄今,钡锶试料中的钙镁络合滴定法仍无一理想的方案。不得不沿用以碳酸铵分离镁后将钙,锶,钡化为硝酸盐,再以丙酮分离钙的复杂手续。     

交替变向电磁场对稀土镁球铁球化衰退的影响

自行研究和设计了交替变向电磁场装置。将采用稀土镁球化处理后的铁水，经不同保温时间后，分别在重力场和电磁场中凝固，利用对比试验的方法考察电磁场对球墨铸铁球化衰退的影响规律。结果表明：交替变向电磁场可加速球化元素镁和稀土的脱S脱O作用，使电磁场中凝固的球墨铸铁S，O含量相对较低，从而抑制了球墨铸铁的球化衰退。     

溶液光谱法测定球墨铸铁中的镁(摘要)

高强度铸铁即球墨铸铁,在机械工业上用途很广。其中镁是决定铸铁性质的重要元素。化学分析测定铸铁中镁,迄今尚无较快的成熟方法。曾用光谱粉末法对铸铁中镁进行测定,但手续繁琐、生产流程长,再现性及准确度均不够理想。为此,我们制定了溶液光谱法测定铸铁中0.02～0.32%的镁,效果良好,完全满足了生产要求,工效提高3～4倍。标准制备:称取0.1658克光谱纯氧化镁(或保证试剂)于250毫升烧杯中,加10毫     

锶合金中锶的分析——EDTA容量法

含锶硅铁中锶的含量约0.5—8%。除主成分硅、铁外,还含有钙、铝、锰及其它重金属元素。用经典方法测定手续繁琐,原子吸收测定较多,化学分析较少。本法采用硝氟酸分解试样,在微碱性(pH7.0—7.5)溶液中加入 Na_2S。此期铁、铝、锰及其它重金属离子生成沉淀,滤液中进行锶钙的测定。取一份溶液加入镁盐,以铬黑 T 作指示剂,控制 pH10,用 EDTA 滴定钙、锶含量。取一份溶液,以钙示剂作指示剂,控制     

硫酸钴中镁的原子吸收光谱测定

本文主要研究不同含量的钴、硫酸以及硫酸钴对测定镁的影响。随着钴、硫酸和硫酸钴含量的增加,镁的吸光度下降。实验证明加入一定量的硝酸镧和氯化锶都不能消除这种干扰。经合成硫酸钴加镁的方法证明了只有在待测样品与标准溶液中硫酸钴的含量相等时,测得结果与加入的镁量完全一致,否则产生偏差得到不真实的结果。     

原子吸收光度法测定铝合金中锶

对铝锶中间合金中锶的测定条件进行探讨，较系统研究了火焰状态、火焰位置、测定体系及干扰元素等对测定结果的影响。     

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.