[Bmim]HSO_4离子液体强化硫脲浸取银矿物

针对硫化银和纯银粉中银的浸出,在以[Bmim]HSO4离子液体调节pH值,Fe2(SO4)3为氧化剂,硫脲为浸出试剂的浸取体系中,研究了pH值、浸出时间、硫脲浓度、氧化剂用量、温度、搅拌速度等因素对银浸出率的影响,并对其强化浸出机制进行了初步探讨。研究结果表明[Bmim]HSO4可强化硫脲浸银,在[Bmim]HSO4浓度为0.30 mol·L-1(pH=1.0),硫脲浓度0.16 mol·L-1,Fe3+浓度11.25×10-3mol·L-1,搅拌速度250 r·min-1,浸出时间24 h,浸出温度298 K的条件下,银的浸出率可以达到78.85%,而以H2SO4调节浸液pH=1时,银浸出率仅为51.10%。对硫脲稳定性的研究表明,[Bmim]HSO4在银浸出过程中不但起到调节浸液pH值的作用,也减少了硫脲的氧化分解,硫脲在[Bmim]HSO4溶液中的剩余浓度比在H2SO4溶液中高12.56%。研究也表明[Bmim]HSO4在银浸出过程中减少了硫化银的二次沉淀。[Bmim]HSO4离子液体作为一种新型浸出溶剂,创造了一个更加有利于银溶解的溶液环境。     

氰化法、硫代硫酸盐法、硫脲法浸出某难浸银精矿比较研究

对某浮选银精矿采用氰化法、硫代硫酸盐法、硫脲法进行银浸出实验,以评估3种不同浸出方法对该银精矿浸出效果．研究结果表明：在最优的工艺参数下[氰化法：碱预处理后加入铵盐,氰化钠浓度0.15 mol/L,pH值为11,液固比（浸出液体积与试样质量之比,单位是mL/g,下同）2∶1,搅拌强度500 r/min,浸出时间为48 h;硫代硫酸盐法：氧化焙烧预处理,氨水浓度1.0 mol/L,硫酸铜浓度0.01 mol/L,硫代硫酸钠浓度0.2 mol/L,pH值为10,液固比4∶1,搅拌强度500 r/min,浸出时间12 h;硫脲法：氧化焙烧和稀硫酸预浸处理,Fe3+浓度7.5×10-3 mol/L,硫脲浓度0.18 mol/L,pH=1.0,液固比为3∶1,搅拌速度250 r/min,浸出时间24 h],硫代硫酸盐方法获得的Ag浸出率为78.58%,硫脲相应获得的Ag浸出率为62.43%,比氰化法获得的浸出率低约3.33%．     

用硫脲从含银湿法炼锌废渣中浸出银

研究了用硫脲从贵州某湿法炼锌废渣中提取银。锌渣球磨至60目,在液固体积质量比5∶1、硫脲浓度1.0 mol/L、Fe3+浓度0.3 mol/L、温度40℃、pH为1.0~2.0条件下浸出2 h,银浸出率达82%以上。     

用NH3-(NH4)2CO3-H2O体系从高炉瓦斯灰中浸出锌试验研究

研究了以NH_3-(NH_4)_2CO_3-H_2O体系从高炉瓦斯灰中浸出锌,考察了温度、总氨浓度、液固体积质量比、[NH_3]/[NH~+_4]、搅拌速度和浸出时间对锌浸出率的影响。结果表明:在25℃、总氨浓度5 mol/L、液固体积质量比4 mL/g、[NH_3]/[NH~+_4]=1/1、搅拌速度300 r/min、浸出时间30 min条件下,锌浸出率达76.71%,浸出效果较好。     

用硫脲从脱硫锌精矿渣中浸出银的试验研究

利用正交试验法研究了用硫脲从脱硫锌精矿渣中浸出银的工艺条件.结果表明,在硫脲浓度0.40 mol/L,渣浆浓度10%, Fe3+浓度0.30 mol/L,浸出时间2 h,反应温度303 K,表面活性剂十二烷基苯磺酸钠质量浓度0.15 g/L,搅拌速率300 r/min的最佳条件下,银的浸出率达86%以上.该方法具有选择性好、试剂毒性小等优点.     

空气氧化—氨浸出废旧电路板中的铜

提出了在氨水—硫酸铵体系下鼓入空气浸出废旧电路板中铜的新工艺。考察了氨水浓度、硫酸铵浓度、固液比、反应温度、通入空气流量和浸出时间对铜浸出率的影响。结果表明,在下述最佳浸出条件下,渣计铜浸出率达到96.67%:氨水浓度2mol/L,硫酸铵浓度2mol/L,固液比1∶20,反应温度25℃、通入空气量8m3/h、浸出时间4h。     

硫氰酸盐—铁(Ⅲ)体系从废电路板中选择性浸出金银

采用硫氰酸盐法从硫酸双氧水体系预处理废电路板金属部分后的渣中选择性浸出金银,并对硫氰酸盐浓度、铁离子浓度、溶液pH、液固比、搅拌速度、温度、浸出时间等因素进行优化。结果表明,在0.1mol/L Fe3+、0.6mol/L SCN-、pH=2、液固比500∶2、搅拌速度200r/min、温度15℃、浸出8h的条件下,金银浸出率分别达到95%和99%,铅浸出率不超过4.5%。     

用硫代硫酸钠从锌浸出渣中浸出银

研究了用硫代硫酸钠从锌浸出渣中浸出银,考察了硫代硫酸钠浓度、液固体积质量比、浸出温度、浸出时间对银浸出率的影响。结果表明:在硫代硫酸钠浓度0.25mol/L、矿浆液固体积质量比4∶1、浸出时间12h、浸出温度40℃条件下,银浸出率为73.96%,银得到有效浸出。     

从金冶炼渣中综合回收铁、金、银

研究了从某金冶炼厂金冶炼渣中回收铁、金、银。考察了硫酸浓度、浸出温度和浸出时间对铁浸出率的影响,以及液固体积质量比、浸出时间、氰化钠用量对金、银浸出率的影响。试验结果表明:在硫酸浓度10.8mol/L、浸出温度90℃、浸出时间2h、液固体积质量比2.5∶1条件下,金冶炼渣中铁浸出率为90.85%;在液固体积质量比3∶1、浸出时间48h、体系pH≈11、氰化钠用量10kg/t条件下,铁浸出尾渣中金、银浸出率分别为72.8%和62.4%。     

SO2-3、NH3?H2O、Cu2＋对高硫金精矿石硫合剂浸出的影响

采用石硫合剂提金法对高硫金精矿进行浸出试验,考察了SO 2-3、NH3? H2 O、Cu 2＋浓度对浸出过程的影响。其结果表明：在磨矿细度-400目80％,液固比6∶1,SO 2-3浓度0．1 mol/L, NH3? H2 O浓度1．6 mol/L,Cu 2＋浓度0．04 mol/L,Na2 CO3浓度0．1 mol/L,搅拌速度500 r/min,浸出温度40℃,浸出时间8 h的条件下,金的浸出率达到88％左右;浸出过程中加入SO 2-3,保证S 2-x和S2 O 2-3的稳定性,并减少因S单质、CuS和Cu2 S的沉积而阻碍浸金传质过程的影响;NH3? H2 O不仅调节浸出pH值,而且与Cu 2＋形成[Cu（NH3）4]2＋,促进金的浸出。     

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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