共沉淀富集分离-ICP—MS法测定地球化学勘探样品中的超痕量金、铂、钯

建立了碲作为共沉淀剂分离富集,采用ICP—MS测定地球化学勘探样品中超痕量金、铂、钯的方法,并研究了共沉淀时各种因素的影响;确定了采用盐酸和氯酸钾分解试样,以2mg碲对金、铂、钯进行共沉淀分离富集,抽滤,残渣用王水溶解,采用电感耦合等离子体质谱法测定的条件。该方法检出限分别为：Au0．062ng／g、Pt0．041ng／g、Pd0．043ng／g,相对标准偏差（n=12）：Au4．81％、R5．46％、Pd3．50％。采用该方法测定了国家一级地球化学标准物质中的痕量Au,Pt,Pd,测定值与标准值相符合。     

铅试金富集-塞曼石墨炉原子吸收光谱法测定矿石样品中铂钯铑铱

建立了铅试金富集-塞曼石墨炉原子吸收光谱法测定矿石样品中铂、钯、铑、铱的新方法。运用传统的铅试金方法熔融分解矿石样品,且采用留铅灰吹的方法使样品中铂、钯、铑、铱富集在约3 mg的铅合粒中。先用HNO3溶解铅合粒,再加入HCl以形成王水溶解,使铂、钯、铑、铱完全进入溶液,然后采用塞曼石墨炉原子吸收光谱法于选定的仪器参数条件下测定。本方法运用二次方程最小二乘法拟合校准曲线,曲线拟合良好。铂、钯、铑、铱的校准曲线拟合系数分别为0.999 9、0.999 9、0.999 2、0.999 4;特征浓度分别为1.854 2 ng/mL、1.543 5ng/mL、0.488 3 ng/mL、0.481 1 ng/mL;相对标准偏差为:Pt 1.5%~4.5%、Pd 1.1%~2.9%、Rh 3.4%~6.3%、Ir 2.9%~5.8%。运用本方法测定标准物质中铂、钯、铑、铱含量,测定结果与认定值相吻合。     

D_(290)树脂-活性炭吸附电感耦合等离子体原子发射光谱法测定铬精矿中金铂钯

铬精矿试样用过氧化钠熔融,经过D290树脂-活性炭柱分离富集,用电感耦合等离子体原子发射光谱(ICP-AES)法测定金、铂、钯。富集在pH1.0的条件下进行,6mol/L硫脲-0.1mol/L盐酸溶液洗脱。测定时选择267.595,265.945,229.653nm分别作为金、铂、钯的分析线,对于2μg/mL的Au、Pt、Pd,测定溶液中50倍浓度的Fe、Si、Cr、Al、Mg没有干扰。金的检出限为0.041μg/mL,铂、钯的检出限为0.16μg/mL。用本法测定标准样品中金、铂、钯,相对标准偏差均小于5%(n=6),测定结果与推荐值相符。     

锍试金富集-电感耦合等离子体质谱法测定地质样品中铂钯铑铱

建立了锍试金富集电感耦合等离子体质谱法(ICP-MS)测定地质样品中铂、钯、铑、铱的新方法。样品用硫化镍富集,酸处理除去碱金属硫化物,过滤,残渣用盐酸和过氧化氢溶解,ICP-MS法测定。研究了富集时各种因素的影响。方法检出限:Pt为0.11ng/g,Pd为0.038ng/g,Rh为0.016ng/g,Ir为0.040ng/g;相对标准偏差(n=12):Pt为4.09%,Pd为4.75%,Rh为4.53%,Ir为4.78%。测定了国家一级地球化学标准物质中痕量Pt,Pd,Rh,Ir,结果与认定值相吻合。     

负载泡沫塑料富集发射光谱法测定化探样品中痕量金、铂、钯

研究了负载三正辛胺泡沫塑料振荡富集发射光谱测定化探样品中痕量金、铂、钯的方法．并对方法的准确度、精密度、检出限作了相应的讨论。实验表明,该方法同时测定金、铂、钯,准确度高,精密度好(RSD为5．8％～19．7％),检出限(ng／g)为Au 0．5,Pt 1．0,Pd 1．5。该方法可以满足地质化探样品的分析测定要求。     

电感耦合等离子体质谱法测定区域地球化学样品中的金铂钯

地球化学样品中的金、铂、钯含量极低,测定前必须进行有效分离。实验采用氯化钠、浓盐酸和饱和高锰酸钾分解混合液冷浸取分解试样,聚氨酯泡沫塑料富集、灰化,残渣王水溶解,电感耦合等离子体质谱法测定区域地球化学样品中的超痕量金、铂、钯。该方法的检出限分别为Au 0.039 ng/g、Pt 0.040 ng/g、Pd 0.058 ng/g,加入标准物质回收率为95.6%~102.5%,测定结果的相对标准偏差为0.33%~8.20%。该方法操作简单,分析速度快,准确度和精密度良好,适合大批量样品的分析测定。     

从铂钯精矿中回收Au、Pt、Pd

以某冶炼厂铜阳极泥处理过程中产生的铂钯精矿为原料,采用氯化浸出—亚硫酸钠还原分金—氯化铵沉铂—氨水沉钯湿法处理工艺回收Au、Pt、Pd。结果表明,工艺运行稳定,所得海绵钯、海绵铂纯度均大于99.95%,总收率大于98%。     

树脂吸附法从沉金后液中回收金铂钯的实践

采用树脂吸附法,利用QPTU树脂,控制温度30～40℃,回收沉金后液中的Au、Pt、Pd贵金属,可以控制尾液含金、铂、钯在0. 2 mg/L以下。结果显示,该树脂对沉金后液中的Au、Pt、Pd都有很好的吸附效果;在此运行温度条件下并没有发生降解;该树脂的吸附突破顺序依次是Pt、Pd和Au。     

铅试金-电感耦合等离子体原子发射光谱法测定高镍锍中金铂钯

采用铅试金法富集高镍锍中金、铂和钯时,因高镍锍中镍、铜含量较高,严重影响着铅试金的熔炼富集和灰吹效果。实验采用盐酸溶解分离高镍锍中镍、铜等基体组分,得到的含贵金属残渣经包铅灰吹法进一步富集与分离,最终实现了铅试金-电感耦合等离子体原子发射光谱法(ICP-AES)对高镍锍中金、铂和钯的准确测定。实验探讨了盐酸用量、铅箔用量、灰皿类型、灰吹损失、银加入量、分析谱线等因素对测定结果的影响。结果表明,对于5 g高镍锍样品,80 mL盐酸几乎可以将镍、铜等基体组分溶解完全;残渣经0.45 μm滤膜收集后,加入5 mg银并包于6.0 g铅箔中,在950 ℃的镁砂灰皿中灰吹,铅及少量贱金属硫化物被氧化分离而金、铂和钯几乎不损失,形成的银合粒经混合酸分解后,银以氯化银沉淀的形式分离不干扰测定;在王水(1+9)介质中,于分析线Au 267.595 nm、Pt 265.945 nm、Pd 340.458 nm处,采用ICP-AES测定金、铂和钯。各元素校准曲线的相关系数均在0.999以上;方法检出限为0.067 μg/g(Au)、0.085 μg/g(Pt)、0.107 μg/g(Pd)。方法用于测定高镍锍中金、铂和钯,结果的相对标准偏差(RSD,n=7)为2.8%~5.9%。测定结果与行业标准方法(YS/T 252.8—2020)对照测定结果基本吻合。     

2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺分光光度法同时测定铂与钯

提出了以2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺(5-Br-PADAM)作显色剂光度法同时测定铂和钯的新方法。在0.2～3.0mol/L高氯酸介质中,Pd(Ⅱ)与5-Br-PADAM可形成稳定的络合物,其最大吸收波长位于609nm处;在pH3.5～4.8的弱酸性介质中,Pt(与5-Br-PADAM定量反应,铂络合物形成后非常稳定,以强酸酸化可转化为另一种质子化型体。在609nm处,二者的吸光度具有良好的加和性。基于二者显色酸度的差异,建立了铂、钯同时测定新方法,显色反应的摩尔吸光系数分别为εPd=8.2×104L.mol-1.cm-1和εPt=5.5×104L.mol-1.cm-1。铂、钯浓度分别在0～1.1mg/L和0～1.4mg/L符合比尔定律。方法用于合金和催化剂中微量铂和钯的同时测定,结果与AAS法测定结果相符,相对标准偏差在0.50%～2.0%之间。     

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.