喷射式浮选机空气反应器数值计算及实验验证

设计了一种喷射式浮选机多喷嘴空气反应器,并深入研究了反应器的性能及特征。应用工程计算流体力学方法,改变喷嘴数量、喷射角度和喷射压力等参数时,模拟分析了浮选机处理量和吸气量的变化规律;对不同参数条件下,空气反应器内部流体的速度、压力分布及湍动能变化进行了计算和分析,揭示了喷射式浮选机的充气浮选机理;解释了多喷嘴充气效果优于单喷嘴;确定了空气反应器最佳参数。实验结果表明：湍动能与充气效果一致性的规律;浮选机充气实验结果与模拟计算结果吻合,证实了数值模拟的可靠性。     

KHD新型充气式浮选机

ＫＨＤ新型充气式浮选机主要由矿浆准备系统、泵、分配器、充气器和机体组成。矿浆在充气器的环形通道内加速至６～１０ｍ／ｓ，压缩空气通过环形通道的缝隙进入高速流动的矿浆中，并分散为微细气泡进行浮选。与机械搅拌式浮选机相比有较多的优点，文中列出了该机在德国和美国选煤厂应用的结果。     

新型脉冲射流浮选机脉冲充气机理研究

为了探讨脉冲射流浮选机的充气搅拌机理,基于工程流体力学计算和样机试验研究,对浮选机充气搅拌单元进行了设计和研究。研究表明:新型脉冲射流浮选机通过增加脉冲反应器,能使矿浆由连续射流状态转变为脉冲射流状态,优化矿浆的吸气能力和混合效率;在矿浆涡旋及空化作用影响下,新型脉冲射流浮选机试验充气量达到1.8 m3/(m2·min),微泡占气泡总量22%,可为浮选作业提供良好的浮选气泡。     

FJC20-6型煤用喷射式浮选机的充气性能

浮选机的充气性能直接影响浮选效果。本文简要介绍有关充气性能的3项指标及充气量测定仪；重点介绍国华公司开发的、国内目前规格和处理能力最大的FJC20-6型煤用喷射式浮选机的单位充气量、充气均匀系数和充气容积利用系数。     

KYF-70充气机械搅拌式浮选机在精选的应用研究

介绍KYF-70充气机械搅拌式浮选机的结构特点,测定70 m3浮选机在精选段作业的矿浆悬浮能力及带矿条件下的充气量.矿浆悬浮能力测试表明KYF-70充气机械搅拌式浮选机对-45μm含量高于80％的矿浆悬浮能力好,槽内矿浆粒度分布均匀,液面稳定.应用情况表明,KYF-70充气机械搅拌式浮选机应用于精选段作业浮选效果良好,...     

煤用喷射式浮选机在望峰岗选煤厂的应用

介绍了装有新型充气搅拌装置的FJC20-4A型煤用喷射式浮选机的工作原理、充气性能以及在望峰岗选煤厂的应用情况。应用情况表明,该新型浸没式充气搅拌装置的可靠性较好。     

搅拌叶轮尺寸对双叶轮浮选机性能的影响

通过对常规机械搅拌式浮选机进行改造,将其搅拌系统设计为2个转子(离心叶轮和搅拌叶轮)配1个定子的结构模式,开发了双叶轮浮选机.为了考察搅拌叶轮直径对双叶轮浮选机性能的影响,试验设计了直径为32、34和36 m m的搅拌叶轮,考察了直径对充气性能、悬浮性能和分选性能的影响.试验表明:浮选机的充气、悬浮和分选性能,与搅拌叶轮的结构特征和浮选机的转速有关.随着转速的增加,充气量越来越大,固体颗粒悬浮质量分数越来越小,而分选效率先增大后减小;在实验室现有搅拌叶轮尺寸条件下,叶轮直径为36 mm时,充气、悬浮和分选效果都达到最佳状态.     

200m^3超大型充气机械搅拌式浮选机工业试验研究

叙述目前国内单槽容积最大的浮选机—200m3超大型充气机械搅拌式浮选机的带矿性能和工业应用效果,测定了浮选机的矿浆悬浮能力、对不同粒级矿物的分选效果、浮选机功耗、带矿条件下的充气量。试验结果表明200m3充气机械搅拌式浮选机矿浆悬浮能力好,槽内矿浆粒度分布均匀,没有粗、细颗粒分层现象,液面稳定。工业试验累计指标与对比流程指标相比:在给矿铜品位低0.001%的情况下,精矿铜品位低0.39%,尾矿铜品位低0.034%,铜回收率高6.77%,浮选效率高6.95%,系统回收率高0.92%,证明超大型浮选机浮选效果好。     

大型贫锡硫化矿浮选机内流场特性的数值模拟

针对广西大厂贫锡多金属硫化矿的浮选特性,利用流体动力学软件FLUENT,对20m3大型贫锡硫化矿浮选机槽内矿浆在不同叶轮转速和充气压力下的湍流强度和含气量进行了仿真研究。研究结果表明,在浮选机叶轮转速为3.3r/s左右,充气压力1.6 MPa时,矿浆分层稳定,槽体内矿浆含气量达到28%。研究结果为20m3大型贫锡硫化矿浮选机的优化研究和工业推广应用起到了重要的指导作用。     

FJCA16-4型煤用喷射式浮选机在临涣选煤厂的应用

由循环泵加压的循环煤浆由混合室进入充气搅拌装置,从喷嘴高速喷出,由于喷射流的抽吸作用,形成负压,空气经吸气管进入充气搅拌装置,经喷射流卷裹剪切,空气被粉碎成气泡并均匀分布于煤浆中,含气煤浆通过喉管射到浮选机假底,完成煤浆充气搅拌过程。     

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。