印度安得拉邦低品位高磷锰矿石联合选矿工艺

采自安得拉邦低品位、易碎锰矿石－2．8＋0．7mm粒级经跳汰选矿，所得精矿锰品位可提高7％－8％，平均产率为57％。跳汰精矿和未经跳汰的－0．7mm粒级合并，并磨至－150μm，然后进行湿式强磁选。磁性产品Mn的含量增加6％，总产率仅50％。－150μm粒级水力旋流器分级结果表明，分级方法对提高锰品位是行不通的，因为矿石中的细粒级是由铁锰氧化矿物和铝硅酸盐脉石矿物组成。但是，－150μm粒级湿式强磁选的非磁性产品进行水力旋流器分级，其沉砂再进行第二次湿式强磁选，则磁性产品锰含量至少可增加7％－8％，总产率约为50％－52％。这两种方法的结合并没有降低产品中磷的含量。从矿石中主要相和磷的分布率的线性关系可以看出矿石磷和其它主要相的复杂性共生关系。     

高效率分级设备——离旋器

<正> 当今重选厂中使用的φ500、φ300、φ125、φ75毫米等各种不同规格的水力旋流器,在分级脱泥作业均起重要作用,但仍有不少问题。分级效率较低,沉砂含泥量高,溢流含砂量也不少,粒级归队不甚理想;脱泥旋流器除上述问题突出外,如φ75毫米脱泥旋流器,沉砂富集比较低,一般为1.5～2倍,浓度也较低,一般为14～20％,溢流金属损失较大。另一主要问题是沉砂嘴较小,一般为φ6～8毫米,容易堵塞,难于正常工作。水力旋流器所存在诸种似乎难于     

凡口铅锌矿充填用细粒级尾砂脱泥与过滤试验

为解决凡口铅锌矿充填用细粒级尾砂过滤困难的问题,对其进行了旋流器脱泥试验,并通过实验室真空抽滤试验和陶瓷过滤机单滤板过滤试验考察了旋流器沉砂的过滤性能。试验结果表明：采用CZI 100旋流器,在合适的条件下,可大量脱除细粒级尾砂中的-9.98 μm微细粒矿泥,并可使沉砂满足浓度大于60%、作业产率大于40%的要求;所得沉砂过滤性能良好,实验室真空抽滤时的滤液透过速度达到现场细粒级尾砂用盘式过滤机给矿的4倍左右,用陶瓷过滤机单滤板过滤时滤饼水分可降至23%以下。     

获各琦铜矿充填站水力旋流器改造实践

获各琦铜矿井下充填系统原使用水力旋流器沉砂进行胶结充填,但随着生产规模的不断增加,充填尾砂量不能满足生产需求,沉砂浓度也仅68%。通过将8台350 mm水力旋流器替换为4台FX150-GX-B×10水力旋流器组,对充填系统进行技术改造。改造后,旋流器沉砂浓度提高到70%,收砂效率提高到72.36%,尾砂利用率提高到60%以上,充填体单轴抗压强度满足生产要求,解决了充填尾砂量不足的问题,减少了尾砂的工业排放,取得了满意的效果。     

云南某铜选厂尾矿再选试验

云南某铜选厂矿石矿泥含量大,导致尾矿铜品位高并还含有大量矿泥。尾矿中铜主要分布在+37 μm粒级,铜在该粒级分布率为66.07%;-10 μm粒级产率为44.39%,而铜在该粒级分布率仅11.41%。采用旋流器预先脱泥、脱碳工艺进行预处理,在旋流器锥角为10°、沉砂口直径为3 mm、给矿压力为0.15 MPa、给矿浓度为11%时,获得的沉砂铜品位为2.35%、回收率为72.41%。沉砂中铜虽然主要以次生硫化铜形式存在,但铜的氧化率达30%以上。为确定沉砂的合理选矿工艺,进行了硫化铜、氧化铜依次选别和硫化铜、氧化铜混合选别探索性对比。结果表明,硫化铜、氧化铜依次选别工艺指标优于硫化铜、氧化铜混合选别工艺。采用硫化铜、氧化铜依次选别工艺,在磨矿细度为-0.074 mm占90%的条件下,以水玻璃、六偏磷酸钠为脉石抑制剂、硫化钠为氧化铜矿物活化剂、丁基黄药为捕收剂进行闭路浮选,获得了精矿铜品位为15.16%、作业回收率为81.05%、对原矿回收率为58.69%的选别指标。     

水力旋流器在尾矿充填浓缩中的研究和应用

中钢苍山铁矿和李官集铁矿的原充填站的尾矿矿浆采用立式砂仓浓缩,存在底部造浆风压不足、溢流浓度较高,尾砂利用率低,不能满足地下采空区要求。通过水力旋流器尾矿浓缩的试验研究,发现采用水力旋流器对尾矿的浓缩效果较好,两个矿山采用旋流器浓缩方案对充填站进行系统的改造后,实际运行效果良好,尾矿浓缩浓度大于65%,尾砂利用率大于70%,满足了采空区对尾矿浓度和尾矿量的要求,矿山达到了采充平衡,同时降低了运营费用。     

青海某金矿浮选尾矿浓缩试验研究与生产实践

青海某金矿选矿厂浮选尾矿难以沉降,浓密机溢流跑浑严重,回水无法使用,浮选尾矿远低于下一工序(氰化浸出)对浓度的要求。为此开展了浮选尾矿浓缩试验研究,试验采用了旋流器预浓缩,分析了旋流器沉砂口及给矿压力对浓缩效率的影响,进行了旋流器溢流絮凝剂筛选试验,确定了适合旋流器溢流的5250絮凝剂及用量。在旋流器给矿浓度为23.94%、-74μm含量为79.83%的情况下,尾矿综合固体浓度达到47.76%,解决了选矿厂回水循环利用及浮选尾矿氰化浸出对浓度的要求。     

江西抚州高岭土矿尾砂研制工艺玻璃

江西抚州高岭土尾砂经淘洗脱泥、球磨后，以８８～４５０μｍ粒级脱泥尾矿作为主要原料成功地研制出了透明玻璃和彩色玻璃制品。     

中线法尾矿筑坝中旋流器底流稀释浓度现场优化试验

为确定中线法尾矿筑坝中旋流器底流适宜的稀释浓度,在攀钢集团马家田尾矿库干滩上开展了3组不同底流稀释浓度的放矿试验,分析了不同底流稀释浓度条件下的沉砂在堆积坡面上的流动性、粒径分布特性和坡面平整度,并进行了旋流器溢流尾砂和适宜底流浓度下的堆积坝沉砂物理力学参数测试。结果表明,稀释浓度70%时,沉砂在堆积坡面上流速适中,颗粒沉积效果好,尾砂运移距离远,堆积坡面较平整;旋流器对尾矿分级效果明显,沉砂固结强度高、渗透性能好。     

马钢南山铁矿东选精矿降铝工艺改造

马钢南山铁矿东选车间铁精矿降铝工艺优化技术改造,利用增加旋流器对分级机溢流预先脱泥,沉砂和溢流分别入选的方案,使精矿中Ａｌ２Ｏ３含量降至１．５９％,精矿品位提高了２个百分点,回收率提高１．６６个百分点。降铝改造后的新工艺流程能适应原矿的波动性,并能保证精矿质量稳定,提高精矿品位和回收率。     

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     

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     

2014 second batch of rare earth quota released

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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