用离子交换树脂从硫代硫酸铵溶液中吸附金和铜

在湿法提金中 ,硫代硫酸盐是很有希望取代氰化物的化学试剂。溶液中存在氨和铜时 ,在碱性范围内 ,金更易被硫代硫酸盐浸出 ,形成金 -硫代硫酸盐配合物 :4Au 8S2 O2 - 3 O2 2 H2 O 4Au(S2 O3) 3- 2 4OH- (1 )当氨和铜的比例适当时 ,通过下列机理强烈催化上述反应 :Au Cu(NH3) 2 4 4S2 O2 - 3Au(S2 O3) 3- 2 Cu(S2 O3) 3- 2 4NH3(2 )4Au(S2 O3) 3- 2 O2 2 H2 O 1 6NH34Cu(NH3) 2 4 8S2 O2 - 3 4OH- (3 )与常规氰化过程相比 ,硫代硫酸盐浸出过程毒性低 ,试剂消耗低 ,浸出速率快 ,尤其对难处理矿石 ,如碳质金矿石。但…     

石墨炉原子吸收测定地球化学样品中痕量金

试样经灼烧,用王水加热分解,并在Fe^3＋存在下,于王水介质中用泡沫塑料吸附Au;吸附Au后的泡沫塑料再用10g／L硫脲溶液解脱,采用斜坡升温技术在220ZS石墨炉原子吸收光谱仪测定超痕量金．根据实验得出最佳分析条件,该方法检出限为0．1ng／g,精密度（RSD,n=12）4．2％-10．8％,经国家一级标准物质分析验证,结果与标准值相符．     

NH_3·H_2O—H_2O系仲钨酸铵溶解度研究

采用测试和回归方程求极限的方法 ,得出温度87～95℃ ,终点NH32mol/L的条件下 ,5(NH4)2O·12WO3·5H2O的平衡溶解度。5(NH4)2O·12WO3·5H2O的溶解度与温度(t)的线性关系为 :y= -588.08+7.28t,其与终点NH3 浓度(mol/L)的线性关系为 :y=36.76+18.86x。中国离子交换法所产5(NH4)2O·12WO3·5H2O溶解度较低 ,其可能原因是晶体中的Si含量较低 ,而NH4Cl含量较高 ,以及由于结晶过程NH4Cl的大量存在 ,水的活度较低 ,致使结晶产物中存在少量溶解度较低的5(NH4)2O·12WO3·7H2O     

感偶等离子体-发射光谱法测定微量金

在一定浓度的王水溶液中加入泡沫塑料吸附金,以0.1％硫脲解脱金于溶液中,以感偶等离子体-发射光谱法进行定量分析。方法的相对均方差在5.80—8.50％之间,分析范围0.25—150克/吨金。一、设备与工作条件等离子体发生器 GP3.5-D1型高频发生器,最大输出功率3.5瓩,频率30—35兆赫,     

ICP-发射光谱法测定地质样品中金

试样经王水分解,在5%～15%的王水介质中,用聚醚型泡沫塑料对金进行分离富集.用硫脲溶液(20g/L)解脱被吸附在泡沫塑料上的金,解脱液在ICP-发射光谱上测定金.方法的检出限为0.020×10~(-6),回收率为97.60%～100.20%,本法具有干扰小,准确度高,快速简便等优点.     

离子交换工艺解吸钨过程中Cl、P、Sn等杂质行为的研究

对湿法冶金离子交换制取APT工艺解吸钨过程中Cl-、P、Sn等杂质的行为进行研究 ,并采取适当的解吸液切割 ,获取纯净的(NH4)2WO4 溶液(AT液) ,以保证结晶APT的质量     

原子吸收法测定矿石中痕量金

本文提出用o.4％硫脲溶液解脱泡沫塑料吸附金,解脱液可直接用火焰法或石墨炉法测定ppb～ppm含量的金,测定范围宽,应用范围广。回收率在97～110％之间,灵敏度为2.5×10~(-11)g/l％,定量下限3ppb,相对标准偏差为6.1％。 目前,广泛采用火焰原子吸收法测定ppm含量金,无焰原子吸收法测定ppb含量金,火焰法和无焰法对金的富集分离。     

封闭溶样-AAS法测定特高品位矿石中的金银

影响特高品位矿石中Au、Ag准确测定的因素主要有AgCl、PbCl2沉淀和Au、Ag矿物的硅酸盐包裹体,W、Mo、Sb和Pb等竞争吸附,容量分析的滴定终点干扰,以及待测溶液的介质及浓度等。研究确定了HCl-HNO3-KClO3（-NH4 HF2）和（ NH2）2 CS封闭溶样,泡沫塑料分段富集（或活性炭富集）,AAS法硫脲介质测定矿石中的Au、Ag。该方法可有效避免各影响因素干扰,且操作简便、不污染环境,分析结果的精密度（ RSD ）为0．66％～0．93％,国家标准样品加标回收率为98％～102％。     

用硫脲浸出、离子交换吸附法从有色金属二次物料中回收金

有色金属废料中的元素金在有氧化剂存在的情况下(如Fe_2(SO_4)_3或H_2O_2)易于被酸性硫脲溶液浸出.浸出时间主要取决于氧化剂的浓度和金复盖膜的厚度.金以Au[SC(NH_2)_2]_2~+络合物的形式进入溶液,用阳离子交换树脂几乎可以完全得到回收,溶液中最后残留的金不大于6μm.脱金后的溶液可以再用于浸出.将饱和的载金阳离子交换树脂(载金量达30～60克/升)烧掉,以回收其中的金.对于用阳离子交换树脂吸附金和铁的研究表明,金的吸附纯粹是通过离子交换机理发生并且金络合物的健力明显地大于铁化合物的键力.     

钼精矿中金的测定

钼精矿中Au经王水溶解、泡塑吸附、硫脲解脱、原子吸收方法分析,钼元素含量高严重影响泡塑对Au的吸附,造成检测结果偏低。试验用NH3·H2O沉淀分离试样中的钼元素,从而除去这些元素的干扰,残渣中Au经王水溶解分离后,再用泡塑吸附,硫脲解脱,原子吸收法测定。此方法的检出限为0．05μg／g。经实验证明,分析结果准确,对Au含量为5．30μg／g和18．0μg／g的样品分别平行测定10次,平均值分别为5．30μg/g和18．0μg/g,RSD分别为1．34％和1．05％,加标准回收率为98．5％-102．4％。     

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。     

Shijiazhuang will Build the World's Biggest Replacingcopper-with-aluminum Cable Production Base

正Shijiazhuang City will build the world’s biggest replacing-copper-with-aluminum cable production base,the annual output value can reach 100 billion yuan,in the future it will develop replacing-copper-with-aluminum highend industry cluster.This piece of news was learned by the reporter at the Rare Earth highiron Aluminum Alloy[Nonferrous Business Opportunity:Aluminum alloy door]Cable Conductor New Technology Application Seminar held at the provincial capital.     

Chongqing is Preparing to Set Up Nonferrous Metal Exchange,in a Bid to Become the Transit Place of Kazakhstan Copper

正Since the beginning of Chongqing’s upgrading to a municipality directly under the Central Government,Chongqing City has established direct friendly relationship with Almaty,Kazakhstan,and carried out a series of cooperation in commerce and trade,and culture     

Guangxi Baise Extends Industrial Chain to Combat Loss in Aluminum Business

正"For each tonne of aluminum being produced,the upstream enterprise on the aluminum industrial chain will suffer loss about 2000yuan."Said Liang Xiao,Deputy Director of Pingguo Industrial Park Management Committee under the Guangxi Baise City,one of the four major aluminum industry bases in China,on August 11.Extending aluminum     

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL ANNUAL CONTENTS Volume 21(2014)

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Chinalco Straightened Out Copper Assets,and Delegated Stock Equity of Yunnan Copper

正Immediately after the news that Chinalco transferred 58%stock equity of Yunnan Copper Group to its wholly-owned subsidiary China Copper Corporation Limited free of charge was disclosed on July 9,many individual investors couldn’t help but to think:Does it mean China Copper Corporation Limited will assemble assets for overall listing?At present,among main copper business companies under China Copper Corporation     

The Development and Reform Commission Encourages Private Capital to Enter Geological Prospecting Field

正At the press conference recently held by the National Development and Reform Commission under the theme"Deepen Reform in Investment AuditApproval System",when answering questions from reporters,Huang Min,Director of the Department of Fixed Assets Investment of the National Development and Reform Commission,said that in the future it would continue to intensify efforts in geological prospecting,and actively guide social capital to enter this field.     

Guangxi's first Nickel Industry Development Research Report Was Released

正Recently,Guangxi Metallurgical Research Institute,a subsidiary of Guangxi Nonferrous Metals Group,completed survey on laterite and related manufacturers in the region,by combining the current development status of laterite both at home and abroad,it compiled Guangxi’s first"Research Report on the Development of Guangxi Nickel Industrial Chain"which adopted laterite as the study subject.This report expounded on the current     

China’s Major Non-ferrous Metals Imports & Exports(End of September. 2014)

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China's Major Non-ferrous Metals Imports & Exports

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