直接还原焙烧—弱磁选回收河南某金冶炼渣中铁

河南某黄金冶炼渣铁品位为27.24%,铁主要以赤铁矿的形式存在。为回收该渣中铁,采用直接还原焙烧—弱磁选工艺进行试验。结果表明:在还原剂焦煤加入量为15%、氧化钙加入量为5%、焙烧温度为1 150℃、焙烧时间为80 min、焙烧产品磨细至-0.045 mm占75%、弱磁选磁场强度为60 k A/m时,可以获得铁品位为91.4%、回收率为79.5%的铁精矿,实现了该黄金冶炼渣中铁的高效回收。     

国外某赤铁矿石悬浮磁化焙烧—磁选试验

国外某微细粒嵌布的赤铁矿石中有回收价值的元素是铁,含量为44.08%,FeO含量仅为0.14%,主要脉石矿物成分SiO_2和Al_2O_3含量分别为13.44%和5.80%;主要铁矿物为赤铁矿,主要脉石矿物为石英;矿石中99.10%的铁为赤(褐)铁。对悬浮磁化焙烧—弱磁选工艺加工、处理矿石的可行性进行了研究。结果表明,在给料粒度为-0.074 mm占55%,焙烧温度为560℃,CO的浓度为30%,还原时间为20 min,弱磁选给矿粒度为-0.038 mm占95%条件下处理矿石,可获得铁品位为58.29%、铁回收率为91.45%的精矿。悬浮磁化焙烧—弱磁选工是实现该类型铁矿石开发利用的有效工艺。     

磁化焙烧—磁选工艺中硫酸渣矿物特征变化的研究

本文采用岩相矿相分析、Ｘ射线衍射分析和电子探针分析等检测手段,对南化硫酸渣在磁化焙烧－磁选工艺中矿物特征的变化进行了研究。南化硫酸渣中铁矿物和脉石矿物之间存在着复杂的嵌布关系和相互浸染现象,导致选矿难度增大;磁化焙烧过程能将弱磁性的赤铁矿还原为强磁性的磁铁矿,而且能改善磁铁矿的结晶度和纯度;磁化焙烧－磁选所得铁精矿中磁铁矿结晶度和纯度较好、蜂窝状结构较少;磁选所得尾矿中铁矿物结晶度和纯度较差,与脉石矿物之间的包裹和浸染现象较严重,导致尾矿中铁品位偏高,而且难以降低     

某含锰赤铁矿石焙烧-弱磁选-强磁选试验

针对某赤铁矿石中褐锰矿含量较高的特点,通过磁化焙烧将赤铁矿还原为磁铁矿,然后采用弱磁选将铁与锰及脉石分离,并对弱磁选尾矿进行强磁选富集回收锰矿物,取得了铁精矿产率为71.32%、铁品位为64.18%、铁回收率为94.79%,锰精矿产率为13.78%、锰品位为27.98%、锰回收率为79.45%的试验指标,使铁和锰得到了较好的综合回收。     

电炉渣高温改性过程中铁物相的行为变化

通过高温改性回收电炉渣中的铁, 研究了保温时间、缓冷时间、盐类添加剂及其用量对电炉渣中铁物相转变的影响, 利用XRD衍射分析电炉渣改性前后的铁物相的赋存状态, 并对改性焙烧产物进行磁选验证了改性效果。结果表明: 焙烧温度1 350 ℃, 焙烧时间120 min, 缓冷时间180 min, 盐类添加剂用量为w(66.7% CaCO₃+ 33.3%MgCO₃)/w(SiO₂)=3/4条件下, 电炉渣中铁橄榄石全部转化为赤铁矿和磁铁矿, 经磁选可得品位50.12%、回收率72.67%的铁精矿。焙烧时间的增加有利于磁铁矿物相的析出和长大; 延长缓冷时间促进赤铁矿物相的形成; 碳酸钙和碱式碳酸镁的组合使用有利于提高铁精矿品位和回收率。     

河北某铁尾矿工艺矿物学研究

河北某铁尾矿堆存于尾矿坝中,占用土地,危害周边环境。为给该尾矿利用提供依据,进行了工艺矿物学研究。结果表明,试样金属矿物主要有赤铁矿和磁铁矿,铁主要赋存在赤铁矿和磁铁矿中,主要脉石矿物为石英;赤铁矿的粒度极细小,大部分为微量级,无法单体解离,赤铁矿集合体的粒度较粗大,但集合体中夹杂较多的脉石矿物,这些脉石矿物粒度极细小,无法从赤铁矿中解离出去,所以赤铁矿很难回收;磁铁矿主要呈自形、半自形粒状产出,粒度较细小均匀,嵌布关系较简单,相对容易单体解离,但磁铁矿含量低,试样中铁较难回收。     

某氰化尾渣预氧化—蓄热还原同步提铁试验研究

辽宁新都黄金选金焙烧氰化尾渣总氰含量719 mg/kg，尾渣中铁矿物主要以赤铁矿的形式存在，TFe品位为35.08%。采用预氧化—蓄热还原同步提铁技术处理氰化尾渣，可实现在氰化物高效分解的同时回收铁精矿。研究结果表明，将氰化尾渣样品预先在550 ℃的空气气氛下焙烧25 min，可将氰化尾渣中的总氰含量降至检出限以下，同时完成对氰化尾渣的蓄热。将预氧化处理后的尾渣在还原温度560 ℃、还原时间30 min、CO浓度40%、总气量500 mL/min的条件下进行蓄热还原试验。焙烧产品使用棒磨机磨至-0.038 mm占82.02%，后在磁场强度143.28 kA/m条件下进行弱磁选，最终得到TFe品位58.94%，回收率89.93%的铁精矿。该工艺不仅将氰化物有效分解，还实现了氰化尾渣中铁矿物的高效回收利用。     

还原焙烧浸出低品位含铜硫酸渣中的铜

某低品位含铜硫酸渣铜品位为0.29%,铁品位为56.11%,直接采用浮选或硫酸浸出均无法回收硫酸渣中的铜,且影响最终铁精矿的质量,造成铜、铁资源浪费。研究发现,硫酸渣经还原焙烧后,铜主要以硫化铜形式存在,矿物嵌布粒度较细。探讨了浸出剂硫酸浓度、磨矿细度、浸出温度、液固比、浸出时间等参数对还原焙烧后硫酸渣中铜浸出的影响。在浸出剂H2SO4体积浓度为3%、磨矿细度-0.045mm占74.55%、浸出温度70℃、固液比1∶4(g/mL)、浸出时间为3h的最佳浸出条件下,铜的浸出率为77.63%,浸渣Cu含量为0.066%。硫酸渣原样经还原焙烧—磨矿—铜浸出—磁选分离试验,铜的浸出率可达82.68%,还可得到铁品位为66.45%、含铜品位为0.052%的合格铁精矿。实现了硫酸渣中铜、铁资源的回收。     

辽宁某氰化尾渣中铁、铅综合回收试验研究

摘 要 辽宁某黄金冶炼企业氰化尾渣中铁、铅含量分别为35.93%、3.88%,具有一定的综合回收价值。针对此尾渣开展了还原焙烧—熔分法回收铁和铅的试验研究,重点考察了焙烧温度、焙烧时间、还原剂用量 和添加剂用量对铁金属化率和铅挥发率的影响。结果表明,在焙烧温度为1 250 ℃、焙烧时间为60 min、焦粉用量为20%、CaO用量为25%的条件下,氰化尾渣的铁金属化率和铅挥发率分别达到99.85%和95.92%;X射线 衍射和扫描电镜分析结果表明,添加剂CaO可以促进焙烧过程中铁还原、铅挥发和金属铁颗粒的聚集长大,并且具有一定的脱硫作用。将焙烧渣在1 600 ℃下熔分1 h,可获得TFe品位达90.02%、硫含量为0.016%、铁回 收率为88.92%的铁锭。熔分渣的各项毒性浸出指标远低于控制标准,实现了氰化尾渣的无害化、资源化利用。     

铜尾渣直接还原焙烧——磁选 回收铁的试验

某铜冶炼渣浮选尾渣中含铁36.80%,铁主要铁橄榄石和磁铁矿的形式赋存,根据其矿石性质特点,以烟煤为还原剂,应用直接还原焙烧—磁选工艺回收铜尾渣中铁。试验结果表明:将铜尾渣与烟煤和作为助还原剂的CaO按100∶30∶20的质量比混合,在焙烧温度1 200℃,焙烧时间为60 min,磨矿细度为-0.045 mm含量占80%,磁场强度为127.32 kA/m的条件下,可获得铁品位为91.68%、铁回收率为82.24%的铁精矿。     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered     

铜熔炼中锍品位对杂质元素分配行为的影响

借助于多相、多成分系统中平衡计算的手段，开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟，分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响，并讨论其热力学分析结果对生产实践的指导意义。     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,