雾化热解法制备活性氧化性

以锌焙砂为原料,经氨水、碳酸氢铵浸出,浸出液经雾化热解、煅烧,制得活性氧化锌。研究表明,锌焙砂在NH3/NH4+=2.5∶1、总氨浓度为8 mol/L、液固比=8∶1、时间1 h、温度35℃条件下,一段浸出液锌含量为54.34 g/L,浸出率为82.56%,经过两段逆流浸出,锌含量可达到97.62 g/L,氨浸锌平均浸出率达97%以上。浸出液经锌粉置换除杂,净化后液进行雾化分解,在雾化器进口温度为340℃,出口温度≥180℃的条件下,制得白色前躯体,在400℃条件下用马弗炉煅烧1 h,得到长度不大于2μm的针状活性氧化锌。     

混合铵盐浸出风化壳淋积型稀土矿中稀土的研究

采用氯化铵和硝酸铵配成的混合铵盐作浸出剂,用柱浸模拟风化壳淋积型稀土矿的浸出过程,考察混合铵盐浸出剂的配比、浓度、液固比、pH和流速等对稀土浸出率的影响。结果表明,这种类型的浸出剂对该稀土矿有较高的稀土浸出率,且能较好地抑制黏土矿物的膨胀,最优工艺条件为:NH4Cl和NH4NO3的质量比8∶2、浸出剂质量浓度10g/L、浸出液pH=4.0、液固比2∶1、流速0.5mL/min,在此条件下稀土浸出率为96.29%,黏土矿物的线膨胀率为2.738%。     

从铜铅锌复杂多金属精矿中两段加压浸出锌铜铁试验研究

针对某地铜铅锌复杂多金属精矿,研究了采用两段加压浸出法浸出锌、铜、铁。试验结果表明：以H2 SO4初始质量浓度105 g/L、Fe质量浓度约15 g/L、Zn质量浓度约55 g/L的溶液为浸出剂,在温度120℃、浸出时间2 h、液固体积质量比4 mL/g、总压力1．9 M Pa、搅拌转速600 r/min、添加剂加入量为矿石质量的0．3％条件下进行一次浸出,锌浸出率为72％左右,铜基本不被浸出,溶液中铁去除率为95％;对一次浸出渣,在硫酸初始质量浓度140 g/L、液固体积质量比4 mL/g、总压力1．9 M Pa、搅拌转速600 r/min、温度160℃、浸出时间3 h、添加剂加入量为一次浸出渣质量的0．3％的条件下进行二次浸出,锌、铜、铁浸出率分别为85．91％,77．76％和58．84％;二次浸出液配制浸出剂用于一次浸出。一次浸出液中,H2 SO4及Fe质量浓度较低,便于后续工序净化除杂、获得符合锌电积要求的净化液。     

湿法炼锌浸出渣减量化浸出工艺研究

以常规湿法炼锌工艺锌浸渣为研究对象,对比研究常压酸浸和加压酸浸条件下锌浸渣的酸性浸出减量化效果,以及渣中锌、铜和铟等有价金属的浸出率。结果表明,在常压酸浸条件下,渣量可减少65%以上,渣中锌含量可降至3%左右,锌、铜和铟的浸出率均在91%以上;在加压酸浸条件下,渣量可减少40%以上,渣中锌含量可将至2%以下,锌和铜的浸出率达到95%左右,但铟浸出率仅为70%左右,相对较低。常压酸浸过程锌浸渣中的铁绝大部分浸出,有利于铟的浸出;加压酸浸过程锌浸渣中的铁大量以铅铁矾的形式留在渣中,阻碍了铟的浸出。常压浸出液中铁含量较高,达到25 g/L以上;加压浸出液中铁含量较低,小于2 g/L,有利于后续浸出液中铜、铟的回收。常压浸出渣量少,有利于渣中铅、银的富集,可单独销售;加压浸出由于铁沉淀入渣,致使渣中铅、银富集比低,适合于铅锌联合企业返回铅熔炼炉。     

含铅多金属废料加压浸出铜锌工艺研究

针对复杂含铅多金属废料,采用加压酸浸的工艺对物料进行处理,获得含铜、锌等有价金属的浸出液。通过实验研究获得最佳的浸出条件为初始硫酸质量浓度120 g/L、浸出温度100℃、浸出时间2.0 h、液固比4∶1,最佳条件下铜和锌的浸出率均可达到95%左右而铅的浸出率小于2%。     

氨浸法综合回收挥发窑氧化锌的试验研究

氨浸法综合回收挥发窑氧化锌,开展了锌浸出条件试验,考察了浸出液净化条件,并回收有价金属铟的研究。结果表明,在锌浸出时,在液固比5∶1、浸出时间3 h、氯化铵和氨的摩尔比为2、浸出温度45℃条件下,锌的浸出率达97%以上。浸出液净化时锌粉加入量宜为2 g/L,净化后液进入锌电积工序。氨浸渣经硫酸浸出后,萃取相比为4∶1、反萃相比为20∶1,铟萃取率高达99.87%。     

从中浸渣中氧压酸浸锌、铁的试验研究

研究了从湿法炼锌中浸渣中氧压酸浸锌和铁,考察了氧压、中浸渣粒度、硫酸质量浓度、浸出时间、浸出温度、液固体积质量比、木质素磺酸钠加入量对锌、铁浸出率的影响.结果表明:在液固体积质量3∶1、始酸质量浓度140～150 g/L、浸出温度(150±5)℃、氧气压力0.8MPa、浸出时间80～90 min、木质素磺酸钠用量为渣量的0.15％的最佳条件下,锌浸出率达98％,铁浸出率为60.87％;降低浸出液终酸质量浓度及提高浸出温度可以使铁有效形成沉淀,抑制其浸出.     

NH3-NH4HCO3-H2O体系浸出钢铁厂含锌烟灰

研究了在NH3-NH4CO3-H2O体系下,以钢铁厂含锌烟灰为原料,影响锌浸出的因素.实验表明:影响锌浸出率的主要因素为氨浓度和浸出时间;较优的工艺条件是总氨浓度9.0 mol/L、浸出温度40℃、浸出液初始pH值11.0～11.5、搅拌速度400r/min、液固比4:1、浸出时间1 h.     

氨性体系处理高炉瓦斯泥浸出锌试验研究

采用NH3-(NH4)2SO4-H2O氨性体系从高炉瓦斯泥中浸出锌,考察了液固比、浸出时间、温度、总氨浓度、搅拌速度对锌浸出率的影响,并对浸出渣的物相进行分析。试验结果表明:液固比为6 m L/g、浸出时间为60 min、温度为20℃、总氨浓度为6.0 mol/L、搅拌速度为200 r/min的条件下,锌的浸出率达到85.6%,浸出渣的主要成分是Si O2、Fe2O3、Fe3O4、Ca O,实现了锌从高炉瓦斯泥中选择性高效溶出,与铁、硅、钙等杂质元素的分离。     

SO2-H2SO4体系中锌浸渣还原浸出锌和铟

以锌浸出渣为对象,研究了在硫酸—二氧化硫体系还原浸出锌浸渣过程中反应温度、转速、液固比、初始硫酸浓度、SO2分压对锌和铟浸出行为及浸出率的影响。结果表明:采用SO2对锌浸渣进行还原浸出能够大幅提高锌和铟的浸出率,在SO2-H2SO4体系下锌浸渣还原过程中的锌和铟的浸出行为及动力学特性符合二级反应方程,浸出过程受到化学反应控制,表观活化能分别为21.72和39.16kJ/mol,提高温度能够显著提高锌和铟的浸出速率,提高液固比和初始硫酸浓度对锌和铟浸出速率影响较小,在一定范围内提高二氧化硫分压对锌和铟浸出速率影响较为显著。在反应温度105℃、转速500r/min、液固比8、初始硫酸浓度120g/L、SO2分压200kPa的条件下反应150min,锌浸出率达到96%以上、铟浸出率达到95%以上。     

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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