非洲某铌钽砂矿综合利用研究

为了提高铌钽精矿的质量和品级，针对粗精矿中电气石的比磁化系数和钽铌矿接近，介电常数与锡石相近，后续提纯难以分离的问题，对钽铌粗精矿进行了分级重选—磁选—电选的联合工艺流程试验，研究获得了含Nb2O5 48.595%、Ta2O5 4.468%，回收率Nb2O5为59.03%、Ta2O5为54.37%的铌钽精矿。试验矿物回收率达到国内领先水平，同时其他有用矿物也得到了综合回收利用。     

四川某锂多金属矿选矿试验

针对四川某锂多金属矿钽铌回收率低的问题,通过矿石性质分析,采用锂辉石钽铌矿混合浮选—锂辉石精矿磁选—磁选精矿重选回收钽铌的联合工艺,对含Li_2O 1.65%、Ta_2O_5 0.009%、Nb_2O_5 0.021%的原矿进行选别,获得了锂辉石精矿Li_2O品位为5.94%、回收率为85.82%的试验指标,并有效提高了矿石中钽铌矿的回收率。     

新疆某伟晶岩型锂多金属矿石中伴生元素的回收试验

新疆某伟晶岩型锂多金属矿伴生钽铌锡等有价元素,其中钽铌主要以钽铌铁矿的形式存在,锡主要以锡石的形式存在。为提高伴生元素的回收率,根据矿石性质最终确定了粗磨—重选预富集—强磁选—离 心分离的原则工艺流程,并开展了相关条件试验研究。重液分析确定重选适宜的入选粒度为-0.35 mm,在此条件下,通过螺旋溜槽粗选—摇床精选工艺实现了钽铌锡预富集。对预富集精矿进行锡石与钽铌铁矿的强磁 选分离,适宜的工作参数为磁场强度800 mT、脉动频率260次/min。非磁性产品主要为锡石和锂辉石,在冲洗水量2.0 L/min、给矿浓度30%、给矿量1.0 kg/min的条件下,确定离心选别适宜的重力加速度为50G。根据 条件试验确定的工艺条件,进行螺旋溜槽粗选—摇床精选—弱磁选—强磁选—离心重选全流程试验,最终获得了Ta2O5品位13.90%、Nb2O5品位29.14%、Ta2O5回收率49.50%、Nb2O5回收率58.37%的钽铌精矿及Sn品位 41.45%、Sn回收率54.39%的锡精矿,有效实现了伴生有价矿物的综合回收。     

磁选尾矿综合回收钽铌锂及长石选矿工艺研究

江西宜春地区钽铌锂选矿厂磁选作业排放的尾矿含Li_2O 1.51%、Ta_2O_5 0.031%、Nb_2O_5 0.027%及长石矿物等,具有较好的再回收利用价值。为综合回收尾矿中的有价资源,对其进行了矿石性质和选矿工艺研究。结果表明,采用"‘摇床+铺布溜槽’重选回收钽铌-浮选回收云母-磁选除杂回收长石"的"重-浮-磁"联合工艺,可获得含Ta_2O_5 21.14%、回收率40.92%的钽铌精矿,含Li_2O 4.32%、回收率71.41%的锂云母精矿,含TFe 0.09%、白度75.40%、产率为32.56%的长石精矿。试验指标良好,钽、铌、锂及长石等矿物均得到了较好的综合回收,具有良好的经济和环保效益,为现场工艺优化及同类资源的综合回收提供了有力技术支撑。     

某钽铌尾矿综合回收试验研究

某钽铌原矿经“阶段磨矿—阶段重选”工艺获得回收率大于90%的钽铌精矿。经化学分析,钽铌尾矿中钽铌品位较低,但有价组分锂含量较高且赋存在云母中,钾长石和钠长石含量也较高。为提高矿产资源利用率,回收钽铌尾矿中的其他有价矿物,对钽铌尾矿进行了综合回收试验研究。试验考虑优先回收锂云母和长石,钽铌可作为副产品富集。但由于该尾矿中Fe₂O₃含量为0.17%,会影响长石产品的白度,因此综合回收需要采用强磁选工艺除铁回收长石,同时采用浮选法回收锂云母、重选法富集钽铌。在优化条件试验的基础上进行了全流程综合回收试验,最终可获得长石产品(产率71.48%、Fe₂O₃≤0.006%)、锂云母精矿(Li₂O品位3.51%、回收率77.66%)和钽铌精矿(Ta₂O₅品位4.06%、回收率30.17%,Nb₂O₅品位4.07%、回收率36.39%),较好地实现了该钽铌尾矿中有价矿物的综合回收利用。     

某伴生钽铌锂辉石矿选矿试验研究

西澳某伴生钽铌锂辉石矿为伟晶岩型锂矿,矿石Li₂O品位1.53%、Ta₂O₅品位0.025%、Nb₂O₅品位0.006%;脉石矿物主要为长石、辉石和石英。为高效开发利用该矿石资源,进行了系统的浮选试验研究以及磁选、重选试验研究。确定采用弱磁选除铁—强磁选、重选联合回收钽铌—强磁选尾矿浮选回收锂辉石的选矿工艺。试验结果表明:原矿在磨矿细度-0.076 mm占75%条件下,弱磁选除铁—强磁选回收钽铌工艺分选指标优于螺旋溜槽重选工艺分选指标,强磁选精矿经摇床1次粗选、1次精选获得Ta₂O₅品位21.35%、对原矿回收率23.03%的钽铌精矿;以碳酸钠、氢氧化钠、氯化钙为浮选锂辉石调整剂,以改性脂肪酸类捕收剂T-88为浮选锂辉石捕收剂,对强磁选尾矿进行锂辉石浮选试验,经1次粗选、2次精选、1次扫选、1次中矿再选锂,获得Li₂O品位5.60%、对原矿回收率76.13%的锂辉石精矿,实现了矿石中锂辉石与钽铌矿物的有效回收。试...     

钽铌矿精选的研究现状#$NL

钽铌矿普遍存在品位较低,嵌布粒度较细、性脆易碎、矿物组分复杂等特点,因此钽铌矿石的选矿往往先进行粗选富集,粗精矿再精选获得合格产品。目前,钽铌矿的精选,重选和磁选工艺仍占主导地位;浮选是回收微细粒钽铌矿物最有效的方法;电选常用来去除杂质和综合回收有用矿物;联合工艺是分选钽铌粗精矿最有效的精选工艺;选冶联合既能提高钽铌矿的品位与回收率,又能综合回收利用其他有价元素,     

四川壤塘锂多金属矿石选矿试验研究

四川壤塘锂多金属矿石中主要有用矿物为锂辉石,具有综合回收价值的矿物为钽铁矿、铌铁矿和锡石。根据钽铌铁矿及锡石与锂辉石和脉石矿物的密度差异、钽铌铁矿与锡石的磁性差异以及锂辉石与脉石矿物的可浮性差异,采用分级重选—磁选—浮选联合工艺流程进行选矿试验,获得了锂精矿、钽铌精矿和锡精矿,使矿石中的有价元素得到了较好的综合回收。锂精矿Li2O品位为5.53%,Li2O回收率为72.68%;钽铌精矿Ta2O5和Nb2O5品位为17.00%和32.55%,Ta2O5和Nb2O5回收率为59.38%和66.05%;锡精矿锡品位为52.16%,锡回收率为80.00%。     

某低品位复杂稀土稀有多金属矿综合回收试验

为综合高效回收利用某含铌、钽、稀土、铷低品位复杂多金属矿,在该矿性质研究的基础上,进行了多种回收方案的分析研究,最终确定采用阶段磨矿—强磁分流—铌、钽、稀土混合浮选—铌钽、稀土分离—黑云母浮选回收铷—强磁尾回收石英、长石的联合选矿工艺流程。试验最终获得了Nb_2O_5品位为19.26%、Ta_2O_5品位为1.98%、Nb_2O_5回收率为35.31%、Ta_2O_5回收率为31.86%的铌钽精矿和CeO_2品位为14.90%(REO品位为39.20%)、CeO_2回收率为23.51%(REO回收率为18.49%)的稀土精矿;同时获得了黑云母(含铷矿物)、石英和长石、部分钛铁矿和磁铁矿,对绝大部分有用矿物实现了分流富集,进行了较好的回收,达到了综合回收利用的目的。     

某非金属矿钽铌锂铷综合回收选矿试验研究北大核心

甘肃某非金属矿主要矿物组成为石英、长石、云母,矿石中伴生有锂、铷、钽、铌等有价金属。针对矿石中钽铌比重大、具有磁性且矿石泥化严重、云母嵌布特性复杂等性质特点,采用“高梯度磁选、摇床精选钽铌—钽铌磁选尾矿脱泥浮选云母—云母粗精矿和钽铌精选尾矿合并再磨精选云母—云母浮选尾矿进行长石石英分离”的工艺流程,获得了Ta_(2)O_(5)+Nb_(2)O_(5)品位和回收率分别为30.16%、55.85%的钽铌精矿;Li_(2)O、Rb_(2)O品位分别为3.28%、0.59%,回收率分别为92.80%、42.35%的云母精矿;Rb_(2)O品位为0.18%、回收率为49.51%的长石精矿和SiO_(2)品位为99.23%的石英精矿,长石精矿和云母精矿中Rb_(2)O总回收率为91.86%,钽铌精矿和石英精矿可作为合格产品直接销售,云母精矿和长石精矿作为后续冶炼工艺提取锂铷的原料,研究结果为矿石的综合利用提供了技术依据和支撑。     

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。