气化炉渣对铁尾矿烧结墙体材料性能的影响

为了降低铁尾矿烧结墙体材料体积密度和提高保温隔热性能,在尾矿中添加部分气化炉渣,采用挤出成型方法制备了铁尾矿烧结墙体材料.结果表明,在950℃烧结时,添加20%气化炉渣可以制备出密度低于1.45g/cm3导热系数低于0. 23 W/(m·K)、抗压强度高于30 MPa的墙体材料,为利用尾矿制备具有节能、利废、保温、隔热、低密度的新型墙体材料提供了一条新的途径.     

大比例掺用铁尾矿制备轻质保温墙体材料

以水泥为胶凝剂、黄石市灵乡铁矿尾矿为主要原料制备轻质保温墙体材料,研究了轻骨料膨胀珍珠岩、铁尾矿及其碱性激发剂掺量和水灰比对试件抗压强度、容重、导热系数的影响。结果表明：试验用碱性激发剂对铁尾矿的活性有显著的激发作用,从而可提高铁尾矿的掺用比例、减少水泥用量;当水泥、铁尾矿、激发剂、膨胀珍珠岩的质量比为1∶2.5∶0.25∶0.63,水灰比为0.8时,试件28 d的抗压强度＞5 MPa、容重＜900 kg/m3、导热系数<0.231 W/（m·k）,满足轻质保温墙体材料的性能要求。     

铁尾矿和废石制备建筑外墙防火保温陶瓷材料

利用河北某铁尾矿和废石为原料制备了建筑外墙防火陶瓷保温材料。对铁尾矿和废石进行了ICP-AES分析、化学成分分析、X射线衍射物相分析、TG-DSC热分析和放射性检测。在此基础上研究了原料配比、原料粉磨细度、发泡剂用量、发泡剂粒度、烧成制度与建筑外墙陶瓷保温材料性能之间的关系。结果表明,以放射性合格的铁尾矿和废石制备建筑外墙防火陶瓷保温材料技术可行。合适的物料配比为铁尾矿用量为40%~55%,废石用量为45%~60%,发泡剂外掺量为0.5%;原料粉磨细度控制在7.45μm(D50)左右;发泡剂粉磨细度为0.037mm(D90);烧成温度1160℃,烧成时间60 min;制备的建筑外墙防火陶瓷保温材料干密度为350 kg/m3,吸水率为0.48%,导热系数为0.09 W/(m·K),抗压强度为2.20 MPa,抗折强度为1.46 MPa,防火等级为A级。     

利用邯郸铁矿尾矿制备轻质隔热墙体材料

以邯郸铁矿尾矿为原料,采用淀粉糊化固化法制备轻质隔热墙体材料。研究了淀粉添加量、烧成温度、加水量等工艺条件对轻质隔热墙体材料气孔率和耐压强度的影响。结果表明,随着淀粉添加量的增加,制品的气孔率增高,耐压强度降低;随着烧成温度的提高,制品的气孔率降低,耐压强度增高;水分添加量对制品性能的影响没有烧成温度和淀粉添加量明显。用本方法可以制备体积密度不超过0.85 g/cm3、耐压强度大于0.5 MPa、导热系数不超过0.18 W/(m.K)的轻质隔热墙体材料,为铁尾矿的综合利用提供了新途径。     

烧成温度对铁尾矿墙体材料性能的影响

研究了以90.8%的某铁尾矿、4.2%的水泥、5%的黏土为原料生产的新型墙体材料试样的物理性能、结构特征、化学成分受烧成温度的影响;比较了900 ℃下烧成的新型墙体材料试样与目前市场上的墙体材料的体积密度、隔热性能、耐压强度等重要性能指标。研究表明,900 ℃下烧成的试样基本具备新型轻质隔热墙体材料的性能。     

某铁尾矿和废石制备建筑外墙防火保温陶瓷材料

利用河北某铁尾矿和废石为原料制备了建筑外墙防火陶瓷保温材料。对铁尾矿和废石进行了ICP-AES分析、化学成分分析、X射线衍射物相分析、TG-DSC热分析和放射性检测。在此基础上研究了原料配比、原料粉磨细度、发泡剂用量、发泡剂粒度、烧成制度与建筑外墙陶瓷保温材料性能之间的关系。结果表明：以放射性合格的铁尾矿和废石制备建筑外墙防火陶瓷保温材料技术可行。合适的物料配比为铁尾矿用量为40~55%,废石用量为45~60%,发泡剂外掺量为0.5%;原料粉磨细度控制在7.45μm(D₅₀)左右;发泡剂粉磨细度为0.037mm(D90);烧成温度1160℃,烧成时间60min;制备的建筑外墙防火陶瓷保温材料干密度为350kg/m₃,吸水率为0.48%,导热系数为0.09W/(m?K),抗压强度为2.20MPa,抗折强度为1.46MPa,防火等级为A级。     

铁尾矿基陶粒混凝土的制备及性能研究

随着矿冶行业的快速发展,尾矿堆积量逐年增多,特别是铁尾矿已成为国内研究者关注的焦点。先用铁尾矿制备轻质高强陶粒,然后以该陶粒作为轻骨料制备陶粒混凝土。采用正交试验研究水灰比、减水剂用量、砂用量、增稠剂用量对陶粒混凝土抗压强度及陶粒上浮的影响。通过试验确定该铁尾矿基陶粒混凝土的最佳方案为水灰比0.25、减水剂用量0.5%、砂用量20%、增稠剂用量0.12%。最终制得28 d抗压强度为67.33 MPa、抗折强度为8.1 MPa、体积密度1 940 kg/m3的高性能陶粒混凝土。研究中解决了轻骨料陶粒混凝土中陶粒上浮问题,实现了资源二次开发。      

萝北某石墨尾矿铁含量对制备发泡陶瓷性能影响研究

通过磁选工艺降低石墨尾矿混合原料的铁含量,研究了铁含量对制备发泡陶瓷的性能影响。结果表明,磁选工艺可以显著降低石墨尾矿的铁含量;当磁选给矿?0.074 mm含量为71.64%、磁场磁感应强度为0.8 T、矿浆质量浓度为15%时,石墨尾矿TFe₂O₃含量从6.37%降低到2.18%。通过发泡陶瓷制备试验发现,磁选后的混合原料的TFe₂O₃含量从4.65%降低到1.81%,制备的发泡陶瓷外观颜色明显改善,抗压强度从7.2 MPa提高到7.9 MPa,导热系数从0.33 W/(m·K)提高到0.36 W/(m·K);抗压强度有所提高,保温性能有所降低,整体上磁选前后发泡陶瓷的性能差异较小。      

铁尾矿干压免烧砖的制备

以陕西某铁尾矿为主要原料,添加少量水泥及适量当地河砂,制备MU15级干压免烧砖,研究了铁尾矿与河砂的质量比、水泥用量、拌和用水量、成型压力以及化学外加剂对尾矿免烧砖抗压强度的影响。结果表明：在成型压力为15 MPa条件下,铁尾矿与河砂的质量比为1.25∶1.00,水泥在固体干料总量中占10%,拌和用水量为固体干料总量的8%,萘系高效减水剂掺量为水泥量的0.8%,葡萄糖酸钠缓凝剂掺量为水泥量的0.03%时,可制得28 d抗压强度达到16.4 MPa的铁尾矿免烧砖,其各项性能指标符合JC/T 422-2007《非烧结垃圾尾矿砖》标准的规定。     

利用四川某铜矿尾矿制作轻质免烧砖的工艺研究

对四川某铜矿选别尾矿的化学成分、矿物成分及相对含量、粒度及其分布进行测试分析表明,该尾矿的矿物成分主要是石英、钠长石,粒度集中分布在40～140目。以该尾矿作骨料,适量水泥作胶结料,石灰作激发剂,分别加入混凝土发泡剂和废弃聚苯泡沫粒作预孔剂,通过浇注和捣打成型、养护等工艺制备了轻质免烧砖。研究了不同原料配比和养护条件下制品密度和抗压强度等性能。当尾矿用量达70～80%时,制品干燥容重仅为页岩实心砖的1/2～2/3,抗压强度达到3.6～10.4MPa,适用于建筑物承重和非承重填充砌块,属低能耗环保型墙体材料。     

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。