低品位褐铁矿制粒—气基磁化焙烧研究

针对某铁品位为30.16%低品位褐铁矿,采用制粒—气基磁化焙烧—磁选工艺进行了试验研究。结果表明,对小球粒度为5～2 mm,混合气体CO、CO2、N2体积比为1∶2∶2,磁化焙烧料层厚度200 mm,焙烧温度为725℃,保温时间为10 min的磁化焙烧产品进行磨选试验,在磨矿细度为-0.074 mm占85%、弱磁选磁场强度为100 kA/m情况下,可以获得铁品位为59.78%、铁回收率达86.19%的弱磁精矿。     

镜铁矿粉矿回转窑磁化焙烧-磁选试验研究

以碳作为还原剂,对某镜铁矿0～15 mm粒级粉矿进行了回转窑磁化焙烧-磁选试验研究。结果表明,还原剂与镜铁矿配比为2.5%,在焙烧温度820 ℃、焙烧时间30 min条件下经回转窑磁化焙烧,焙烧矿磨至-0.048 mm粒级占80%,在磁场强度120 kA/m条件下弱磁选获得铁精矿,其中给矿粒级0～0.5 mm所得弱磁选精矿平均全铁品位57.27%、平均铁回收率83.24%; 0.5～1.0 mm粒级所得弱磁选精矿平均全铁品位57.55%、平均铁回收率82.92%; 给矿粒级1～5 mm所得弱磁选精矿平均全铁品位57.58%、平均铁回收率89.31%,给矿粒级5～15 mm所得弱磁选精矿全铁品位58.36%、铁回收率84.40％; 全粒级弱磁选精矿平均全铁品位57.70%、平均回收率84.97%。     

海南儋州鲕状褐铁矿选矿研究

针对海南儋州某褐铁矿矿石性质,采用阶段磨矿多段分选工艺,进行了强磁选、絮凝浮选、磁化焙烧及弱磁选等选矿试验研究。第一段磨矿细度为-0．074mm68％的原矿经一次强磁粗扫选,混合精矿进入二次磨矿,-0．074mm占95％的磨矿产品絮凝去泥后进入混合胺反浮选,浮选精矿再磁化焙烧一弱磁选,可得到铁品位60．45％、回收率52．48％的最终精矿。     

镜铁山5～15mm粒级镜铁矿石磁化焙烧—弱磁选试验

甘肃镜铁山矿采用竖炉磁化焙烧—弱磁选—反浮选工艺处理100~15 mm的镜铁矿石,可获得铁品位58.5%左右、铁回收率78%左右的铁精矿;对15~0 mm的粉矿采用磨矿—强磁选工艺处理,仅能获得铁品位为47.5%左右、铁回收率为60%左右的铁精矿。为了提高粉矿分选指标,改善烧结料的品质,对粉矿中的15~5 mm粒级进行了磁化焙烧—弱磁选试验。结果表明,在煤粉与试样的质量比为2%,煤粉粒度为1~0 mm,焙烧温度为810℃,焙烧时间为60 min,焙烧产物磨矿细度为-0.074 mm占80%,弱磁选磁场强度为91.56 kA/m条件下,可获得铁品位为55.80%、铁回收率为83.97%的铁精矿。     

某菱-赤褐混合型铁矿石回转窑磁化焙烧—弱磁选试验

回转窑磁化焙烧—磁选技术是综合回收处理各类菱-赤褐混合型铁矿石的有效手段。甘肃某菱-赤褐混合型铁矿石铁品位33. 83%,铁主要以赤褐铁矿和菱铁矿的形式存在,占总铁的84. 04%,难以选别。在焙烧温度800℃、还原剂用量2%、焙烧时间30 min、焙烧矿磨矿细度-0. 037 mm 77. 87%的条件下进行磁化焙烧—1粗1精弱磁选试验,可获得铁精矿产率58. 12%、品位58. 76%、回收率87. 31%的良好指标。菱铁矿焙烧过程生成的CO能减少焙烧还原剂的用量,回转窑磁化焙烧—磁选技术适于处理该类菱-赤褐混合型铁矿石。     

难选褐铁矿流态化磁化焙烧—弱磁选工艺研究北大核心

某低品位复杂难选铁矿,铁主要以褐铁矿形式存在,褐铁矿与脉石矿物紧密共生,导致强磁选精矿铁品位偏低,难以获得合格铁精矿。通过试验发现,采用高梯度强磁选预富集—流态化磁化焙烧—弱磁选工艺可以高效利用该褐铁矿,重点考察了焙烧温度、焙烧时间、还原气氛和气量,以及焙烧产品磨矿细度、磁感应强度等参数对强磁精矿磁化焙烧指标的影响。同时,详细分析了焙烧前后试样中铁物相及嵌布特征的变化情况。结果表明,针对铁品位36.58%、粒度为-0.074 mm占83.73%的强磁精矿,在焙烧温度500℃、焙烧时间15 min、还原气体CO浓度20%、总气量600 mL/min,焙烧产品磨矿细度为-0.043 mm占90%、磁场强度0.15 T的试验条件下,采用流态化磁化焙烧—弱磁选工艺,最终获得了产率59.01%、铁品位58.69%和铁回收率85.89%的铁精矿。研究结果为该类难选铁矿资源的高效利用提供了一种新的技术途径。     

某鲕状赤铁矿循环流化床焙烧-磁选试验研究

采用实验室循环流化床装置,以CO与N2的混合气体和电加热方式模拟燃煤还原焙烧气氛,对铁品位为47.20%的鄂西某鲕状赤铁矿进行磁化焙烧-弱磁选试验,结果表明,在合适的焙烧温度、焙烧时间、焙烧气氛、气体流量、磁场强度及-325目占80%的最终磨矿细度下,经过循环流化床焙烧-阶段磨矿-一粗一精两段弱磁选,可获得精矿铁品位为56.60%,对焙烧矿铁回收率为77.79 %的较好选别指标。     

重庆某菱铁矿石磁化焙烧—磁选试验

为了确定重庆某高度氧化的菱铁矿资源的开发利用方案,采用磁化焙烧—磨矿—弱磁选工艺进行了选矿试验。结果表明:在磁化焙烧温度为800℃、焙烧时间为50 min、配碳量为10%、磁化焙烧产物的磨矿细度为-200目占88%、弱磁选磁场强度为119.43 k A/m的情况下,可获得铁品位为58.94%、铁回收率为76.38%的弱磁选精矿;弱磁选精矿中Al2O3、Mg O、Mn O的含量较高,是仅次于Si O2的影响精矿铁品位的因素,这些杂质有待后续反浮选试验脱除。     

大西沟菱铁矿闪速磁化焙烧-磁选探索试验

采用自主研发的闪速磁化焙烧中试装置,对铁品位为21.21%的大西沟铁矿菱铁矿-1 mm粉矿进行闪速磁化焙烧-弱磁选探索性试验,获得了铁精矿产率为38%~40%,铁品位＞56%,金属回收率＞80%的良好试验指标,为难选弱磁性铁矿石的高效利用开辟了新的工艺路线。     

难选铁矿石悬浮磁化焙烧技术研究现状及进展

简述了悬浮磁化焙烧技术的形成历程,分析了预富集-悬浮磁化焙烧-磁选工艺（PRSM）选别复杂难选铁矿的技术优点。铁品位31.63%的东鞍山贫赤铁矿经预富集-悬浮磁化焙烧-弱磁选工艺处理,可获得铁品位为66.55%、回收率为77.01%的优质铁精矿;铁品位10.60%的鞍钢东部尾矿经预富集-悬浮磁化焙烧-弱磁选工艺处理,可获得铁精矿铁品位65.69%、回收率55.33%的技术指标;酒钢粉矿采用悬浮磁化焙烧-弱磁选工艺处理,可获得精矿铁品位60.30%、回收率79.49%的技术指标。东鞍山贫赤铁矿、鞍钢东部尾矿和酒钢粉矿经悬浮磁化焙烧扩大连续试验处理均取得了良好的选别指标,且设备运行稳定。PRSM技术为我国复杂难选铁矿选矿技术的重大突破。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。