焙烧氰化尾渣中氧化铁的磁化焙烧研究

对金精矿焙烧氰化浸金工艺产生的尾渣用煤粉作还原剂进行了磁化焙烧研究,通过对尾渣中铁的物相分析表明,尾渣中的铁主要以Fe2O3的形态存在。主要研究了煤粉的加入量、焙烧温度和焙烧时间对尾渣中铁的还原度的影响。结果表明,以煤为原料通过磁化焙烧可以获得Fe3O4,磁化焙烧的较优条件为焙烧温度750℃,焙烧时间1 h,煤粉用量为尾矿重量的10%,可以使焙烧处理的尾矿中Fe2O3的还原度达到51.7%,磁化焙烧后渣中的磁性矿中铁达到72.75%。     

硫铁矿烧渣直接还原回收有价金属

研究了采用回转短窑对硫铁矿烧渣进行焙烧以回收有价金属的方法,考察了不同的工艺条件对硫铁矿烧渣焙烧的影响。研究结果表明:在还原温度在1 250℃下、还原时间为60min下,硫铁矿烧渣得到充分的还原。金、银、铜、铅、锌的挥发率中试分别达到93.26%,82.20%,82.55%,88.53%和83.48%,此时球团的硬度可以达到2 100N。     

硫铁矿还原烧渣酸浸液试验研究

研究了硫铁矿精矿还原硫酸烧渣酸浸液及其反应机理。试验结果表明:当浸出液中Fe3+浓度为1.1 mol/L时,在液固比为3∶2、90℃、搅拌速度500 r/min的条件下,反应3 h,酸浸液中的Fe3+的还原率达到96.5%,其反应级数为1.66,表观活化能为60.26 kJ/mol。     

铁矾渣还原焙烧制备磁铁矿的研究

对某锌冶炼厂的铁矾渣进行了粉煤还原焙烧-磁选试验研究,考查了焙烧过程中Zn、Fe、S等主要元素的行为。研究结果表明,在900℃时还原焙烧可以产出磁性很强的磁铁矿,Zn转化为铁酸锌。超过900℃时会有有碱性硫化物生成。粉煤还原焙烧铁矾的最佳条件是:温度900℃,粉煤用量为45g/kg,焙烧时间75min。此时烧渣含S3.07%,含Fe55.94%,烧渣水浸后含S降低到1.47%。在最佳条件下进行焙烧—磁选,精矿含Fe在58.99%～58.72%之间,精矿中Zn含量均比尾矿高约1%,烧渣中大部分S与磁性产物在一起,磁选精矿含S在2.5%～3%之间。     

从硫铁矿渣中提取铁精矿粉

利用氧化脱硫——磁化焙烧——湿式磁选工艺,从硫铁矿渣中提取铁精矿粉。     

硫铁矿烧渣资源化利用的试验研究

用硫铁矿烧渣生产铁精粉,可为铁矿资源日益紧张的钢铁工业提供炼铁原料。本文针对三种品级的硫铁矿烧渣,研究了各自适宜的处理工艺。对于TFe(铁品位)相对较高的棕色型烧渣,通过磨矿-弱磁选-强磁选工艺,依次分选出磁铁矿、赤铁矿,将TFe从61.21%提高到64.06%;对于TFe中等的红色型烧渣,通过磁化焙烧-磨选工艺,将烧渣在温度650～700℃、CO/(CO+CO2)为10%～20%的条件下焙烧,烧渣中赤铁矿可较好地还原转化成磁铁矿,再经弱磁选分离,可使TFe从53.51%提高到64%以上;对于TFe较低的黑色型烧渣,通过磨矿-弱磁选工艺,TFe从44.83%提高到64.73%。通过分选试验,三种硫铁矿烧渣的TFe都可提高到64%以上,回收率可达77%以上。本研究为不同类型的硫铁矿烧渣选择适宜的处理工艺提供了依据和借鉴。     

钡盐脱硫渣合成铝酸钡循环利用的实验研究

对钡盐脱硫渣火法合成铝酸钡进行了热力学分析,并探讨其合成的最优条件。试验结果表明:在焙烧时间80 min、焙烧温度1400℃、Al2O3/BaO分子比1.1的条件下,合成率可达96%,合成铝酸钡用于脱硫剂循环利用,脱硫率可达80%。     

无氧条件硫化亚铁还原氧化锰矿的过程与机理

无氧条件下以硫铁矿为还原剂,探究硫基对Mn(IV)的还原作用。考察了S/Mn、焙烧温度、焙烧时间对焙烧产物与锰浸出率的影响。实验结果表明:硫基对Mn(IV)有较强的还原作用,在ω(S/Mn)为0.28、焙烧温度为650℃、焙烧时间为20 min的条件下,焙烧产物中锰的物相主要为Mn O与Mn SO_4,锰浸出率可达94.42%。     

流态化焙烧炉处理赤铁矿渣的研究与应用

本文提出充分利用湿法炼锌产出的赤铁矿渣含铁量高的优点，将赤铁矿渣与硫铁矿混合配料，利用流态化焙烧炉进行焙烧产出铁渣的思路。分析赤铁矿渣和硫铁矿流态化焙烧的机理，对焙烧炉本体、除尘及排渣设备进行局部改造，从而满足锌精矿焙烧炉改烧硫铁矿和赤铁矿渣混合料的工况要求，实现锌系统资源的内部协同。利用焙烧炉处理赤铁矿渣和硫铁矿混合物料，可产出含硫量小于0.5%、含铁量大于55%的铁渣，减少吨锌浸出渣回转窑处理量，节约生产成本，具有较好的经济效益。     

无取向电工钢RH脱硫渣系的研究

在15 kg真空感应炉上,用CaO-Al2O3-SiO2-MgO渣系进行脱硫试验,探讨了脱硫渣系碱度、MI、Al2O3、CaF2对脱硫效果的影响。研究结果表明,随脱硫渣系碱度、MI、Al2O3和CaF2含量的增加,脱硫率都呈现先增加后减少的趋势。初始硫含量为0.009 33%~0.010 73%,加入脱硫渣系4 min时间内表观脱硫速率为(0.000 96~0.001 49)%/min,平均脱硫率为81.2%,最高达86.8%。当脱硫渣中w(CaO)=58.15%、w(SiO2)=4.85%、w(Al2O3)=25%、w(MgO)=6%、w(CaF2)=6%,脱硫效果最好,此时钢液中硫为0.001 33%。     

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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