高频红外吸收法快速测定硫精矿中高含量硫

采用硫铁矿标准样品绘制硫的校准曲线,并用内控管理样品对曲线进行校准,建立了快速测定硫精矿中高含量硫的高频红外吸收法。对样品的粒度、称样量、燃烧时间和助熔剂的选择进行了研究。结果表明,以约0.400 g铁屑和约1.500 g钨粒作为助熔剂,0.100 0 g样品在高频感应条件下燃烧45 s,然后在选定的仪器工作参数下测定,硫的测定结果与空气燃烧中和滴定法的测定结果相符。对一硫精矿样品进行精密度试验,硫的11次测定结果的相对标准偏差(RSD)为0.39% 。方法可以用于硫精矿中质量分数为40%～50%硫的快速测定。     

冶金焦炭硫形态及其对高炉煤气硫的影响

通过对10种冶金焦炭的分析,探讨焦炭全硫分、焦炭不同形态硫分和焦炭表面吸附硫分对高炉煤气含硫的影响。试验结果表明10种冶金焦炭的全硫为0. 66%～0. 81%,焦炭全硫与高炉煤气含硫没有明显的关系;冶金焦炭中包括无机硫和有机硫,有机硫又分为噻吩、砜和亚砜,噻吩类硫占比为20. 05%～53. 84%;亚砜类15. 28%～26. 14%;砜类2. 91%～34. 92%;无机硫10. 1%～34. 66%。焦炭中噻吩、砜和亚砜等有机硫、焦炭无机硫与高炉煤气含硫关系不明显。随着焦炭中噻吩硫增加,无机硫下降,高炉煤气含硫增加。焦炭的表面附着硫大部分都集中在0. 008%～0. 015%之间。理论计算表明0. 01%的焦炭表面附着硫相当于高炉煤气中硫量增加23. 91mg/m~3。高炉生产实践表明0. 01%的硫对高炉煤气的影响在20～30 mg/m~3。要控制高炉煤气的硫在87mg/m~3,焦炭吸附硫以小于0. 01%为宜。     

含结晶水铁矿中硫的红外吸收测定

红外碳硫 分析仪测定金属中的硫既快又准已有共识,但直接测定含结晶水铁矿中的硫尚未见报道,究其原因主要是结晶水干扰测定,本文提出了仪器改进措施,并采用最佳分析条件直接测定含结晶水铁矿中硫,结果令人满意.一、仪器和试剂EMIA-2200型碳硫分析仪;LECOCS-244碳硫分析仪.纯铁、钨粉(S%<0.001%).     

原子吸收法测定硫精矿中钴量

本试验确立了在硝酸酸性介质中,火焰原子吸收法直接测定硫精矿中钴量。基体中,铁量在50毫克以上,干扰趋于稳定,采用背景扣除干扰,取得了满意的结果,可测定硫精矿中0.00x～x.0%的钴量     

高频红外吸收法快速测定铜精矿中高含量硫

硫含量是铜精矿一项重要的技术指标。测定铜精矿中硫经典方法有重量法[1]和容量法[2],重量法流程长、操作繁琐、劳动强度大,容量法准确度和精密度不理想。用红外碳硫测定仪测定碳硫,方法简单、快速、准确度好,灵敏度高,广泛用于各类样品的分析。美国LECO公司的CS-444碳硫仪,适合于低含量硫的测定,对于高含量硫的测定,误差大。本方法应用含硫很低二氧化硅粉作为稀释剂,样品经适当稀释后,硫的含量落在仪器的检测范围。通过对测定条件进行优化,测定了铜精矿中高含量硫,结果与重量法结果相符,相对标准偏差小于0·73%。1实验部分1·1主要仪器…     

红外吸收法测定金属锰中碳硫含量

介绍一种用钢铁标样直接测定金属锰中碳、硫的高频感应红外碳硫分析方法,方法快速、灵敏、准确,碳、硫测定下限质量分数分别为0.002%和0.0025%,相对标准偏差小于2%.     

电感耦合等离子体质谱法测定稀渣中的铊

稀渣试样采用盐酸、硝酸、硫酸消解,氢溴酸除去大量的锑,挥发除去硫,沉淀除去部分铅、硅、银、铜等成分,用电感耦合等离子质谱法(ICP-MS)测定样品溶液中铊的含量。对基体及主要杂质元素的干扰情况及消除方法进行试验,优化分析方法。该方法简单、快速、准确,相对标准偏差为1. 41%～3. 18%(n=11),加标回收率为92. 7%～103. 1%,在0. 01～10μg/L的范围内线性相关系数均大于0. 999 9,可准确测定稀渣中0. 000 05%～0. 01%的铊。     

红外吸收法测定硅锰合金中碳、硫

应用高频红外碳硫仪 ,建立了硅锰合金中碳、硫的测定方法 ,对测定条件如助熔剂、分析时间等进行了探讨。在最大电流 40 0mA ,载气流速 2 7～ 3 2L/min ,最短分析时间 3 0s(对碳 )、40s(对硫 ) ,比较水平 1 0 0 (对碳 )、2 0 0 (对硫 ) ,坩埚焙烧2h等最佳条件下测定 ,分析结果令人满意     

钢铁中超低碳的分析

用红外碳硫分析仪 ,研究了在陶瓷坩埚中事先加入助熔剂 ,用高频加热打底造浴等一系列方法 ,使碳空白降至可忽略不计且稳定 ,以达到分析钢铁中超低碳的目的。方法的测定范围为 0.0 0 0 5 %～ 0.0 0 3 0 % ,结果令人满意。     

红外吸收法测定钼铁中碳、硫

应用高频红外碳硫仪 ,建立了钼铁合金中碳硫测定方法 ,对选择适当的测定条件如助熔剂 ,分析时间等进行了探讨 ,最佳测定条件 :最大工作电流为 40 0mA ;载气流速为 3L/min ;载气 (氧气 )纯度为 99.99% ;陶瓷坩埚需经 110.0℃灼烧 2h后 ,可使空白降至最小 ;C元素最短分析时间为 3 0s,比较水平为 1 0 0 ;S元素最短分析时为 40s ,比较水平为 5 0 0。     

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.