氮吹水浴-离子色谱法测定黄金冶炼产物氰化渣中氰化物

准确测定黄金冶炼产物氰化渣中CN^-含量，对判断黄金冶炼产物氰化渣中CN^-的危害性有重要意义。利用氮吹-水浴加热蒸馏提取CN^-,避免了加热易燃易爆的危险，通过吸收瓶前加装串联脱硫装置吸附样品中的硫，消除了S^2-对CN^-测定的干扰，最终实现了离子色谱法对黄金冶炼产物氰化渣中CN^-的测定。对淋洗液的种类、浓度、流速等条件进行了优化，确定淋洗液为0.10 mol/L氢氧化钠-0.05 mol/L醋酸钠-0.5%(体积分数)乙二胺混合液，流速为1.0 min/mL。CN^-质量浓度在1～30μg/L范围内与其谱峰面积呈良好的线性关系，相关系数为0.999 3,最小检测浓度为0.15μg/L,方法检出限为2.9μg/kg,定量限为9.6μg/kg。按照实验方法测定3个不同含量水平的氰化渣样品并进行加标回收试验，测定结果的相对标准偏差(RSD,n=6)为2.7%～6.5%,回收率为94%～111%。选取高、中、低含量的固体废弃物中总CN^-<...     

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。     

膨润土对氰化贫液中各离子的吸附

研究膨润土对高浓度氰化贫液中各离子的吸附作用,考察了温度、pH、吸附时间、膨润土用量等对吸附效果的影响。结果表明,膨润土吸附氰化贫液的最适宜的工艺条件为:膨润土投加量10g/L、时间40min、溶液温度25℃、氰化贫液pH=10(即氰化贫液的初始pH)。氰、铜和锌3种离子的吸附率分别达到56%、55%和93%。     

基体分离ICP-AES法测定电解铜中杂质元素

研究了于EDTA存在下 ,氯化钠 -二乙基二硫代氨基甲酸钠 -丙醇体系萃取分离铜 ,用ICP AES法同时测定电解铜样品中Mg ,Al,Fe ,Sb ,Zn ,Ag ,Pb ,Bi,Cr ,Ni,Cd ,Sn ,Mn ,As ,Te ,Se的新方法。方法的检出限为 0.0 0 1～ 0.0 3 6μg/mL ,回收率为 92.4%～ 10 9.5 % ,RSD小于 4.2 %。该法准确、快速、简便 ,应用于电解铜的测定 ,结果满意。     

ICP-AES法测定高纯阴极铜中杂质元素

研究了EDTA存在下 ,氯化钠 -二乙基二硫代氨基甲酸钠 -丙醇体系萃取分离铜 ,用ICP AES法同时测定高纯阴极铜样品中Pb ,Fe ,Bi,Sb ,As ,Sn ,Ni,Zn ,P ,S ,Ag ,Se ,Te ,Si,Mn ,Cr的新方法。方法的检出限为 0.0 0 3～ 0.0 2 8μg/mL ,回收率为 94.5 %～ 10 7.2 % ,RSD小于 4.7%。该法准确、快速、简便 ,应用于阴极铜中杂质元素的测定 ,结果满意     

磷酸三丁酯增塑泡沫塑料富集火焰原子吸收分光光度计法测定氰化液中的金

使用喷洒的方式,将磷酸三丁酯均匀负载到泡沫塑料上,制备了一种磷酸三丁酯增塑泡沫塑料,提高了对金的吸附率。在一定的酸度下,使用磷酸三丁酯增塑泡沫塑料对经过王水处理的氰化液溶液中的金进行富集,被吸附的金使用热的硫脲溶液解脱,以火焰原子吸收分光光度计法测定。对高、中、低3个水平氰化液的管理样品（2 586.4,240.4,25.2 μg/L）进行测定,回收率分别为99.65%、101.08%和101.19%。取200 μg 金标准溶液13份进行平行操作,测定其平均值为198.45μg,相对标准差为2.27%,检出限为4 μg/L。使用0.3 g磷酸三丁酯增塑泡沫塑料,吸附容量在8 mg时,金的吸附率仍然可达到98.37%。与传统的吸附方法相比,本方法吸附率高,操作更简便,能够满足氰化液中金含量分析的要求。     

用分光光度法测定氰化浸金液中的SCN~-

利用Fe3+与SCN~-的配合反应,建立测定氰化浸金液中SCN~-的分光光度法,优化波长、溶液pH、硝酸铁用量等测定最佳参数。方法对氰化浸金液中高浓度SCN~-的测定有很好的适用性,且操作简单、快速,准确性和精密度较高。SCN~-质量浓度与其吸光度在仪器测量范围内呈良好的线性关系,方法检出限为0.30mg/L,相对标准偏差小于2.50%,加标回收率为94.30%～101.13%。     

铝制食具和橡胶制品中锌的快速示波极谱法

在 0.10mol/L乙酸 (pH 2.8)及硫酸联胺底液中 ,锌在滴汞电极上产生一个灵敏的极谱还原波 ,峰电位 (Ep)为 -1 0 6V(vs SCE)。锌浓度在 0.0 3～ 2.0 μg/mL范围内与波高呈良好的线性关系。方法的选择性高、重复性好。用于铝制食具、食品用橡胶制品中锌的测定 ,回收率为 95.6 %～ 110.4% ,RSD <5 % ,结果令人满意。     

氨水络合分离-电感耦合等离子体质谱法测定高温合金中痕量银

详细研究了ICP MS测定银时93Nb1 6 O+ 和91 Zr1 6 O+ 对1 0 9Ag+ 和1 0 7Ag+ 干扰和消除干扰的方法 ,建立了氨水络合分离-ICP MS测定高温合金中痕量银的方法。在 pH9氨性介质中 ,银和氨络合保留在溶液中 ,锆和铌生成沉淀而被分离 ,消除了铌和锆的干扰。加Re或Rh内标校正仪器漂移和基体效应 ,以ICP MS测定。测定结果准确可靠 ,方法的测定范围为0.0 0 0 0 0 5 %～ 0 .0 1% ,检出限为 0.0 0 0 0 0 3 %。     

黄金氰化浸取液中硫氰酸根的测定

从黄铁矿废渣中回收金银,因渣中残硫的存在,在氰化处理过程中,部份残硫转化成硫氰酸盐。钝化了部份氰根对金银的氰化作用,因而硫氰酸盐的转化率为黄金冶炼所 重视。 目前氰化过程中硫氰酸盐的测定方法,文献报导甚少。本方法对氰化过程中贵液贫液中硫氰酸根离子测定,进行了一系列试验     

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.