粘结剂种类和用量对粉煤灰纤维板性能的影响

以粉煤灰纤维为基材,分别采用水玻璃、聚乙烯醇、水玻璃/聚乙烯醇混合胶为粘结剂,通过水相分散稀释上胶再网滤定型的方法制备粉煤灰纤维板,探讨了粉煤灰纤维用量、粘结剂种类和用量等对粉煤灰纤维板力学性能和吸湿率的影响.     

高炉渣制备渣棉试验研究

为了提高高炉渣的附加值和回收利用高炉熔渣显热,介绍了目前高炉渣处理的技术现状,并阐述了在处理过程中存在的弊端。依据岩棉成纤原理,提出了高炉渣调质制备用于管道保温材料的矿渣棉的技术构想,并采用高速喷吹手段验证了高炉渣成纤过程,得出酸度系数配制成Mk=1.2,风口压力为0.35MPa,出渣口温度控制在1350℃左右,所得纤维具有较好的理化性能。最后预测未来管道保温材料市场前景和发展新趋势。     

改性膨润土颗粒制备及对微污染水吸附性研究

采用聚乙烯醇(PVA)为粘结剂和不同造孔剂(碳酸氢钠、卡拉胶、淀粉)对微波铝改性膨润土进行造粒,制备改性膨润土颗粒MBG1、MBG2、MBG3。考察了不同制备条件下MBG1、MBG2、MBG3对微污染水中UV254和NH4-N的降低效果。结果表明,MBG1对UV254和NH4-N降低效果优于MBG2和MBG3,MBG1的最佳制备条件为:PVA用量10 g/100m L水,碳酸氢钠用量5 g/100m L水,包埋量(m改性土∶mPVA)=10。在p H值为7、投加量3 g/L、吸附时间20 min的条件下,MBG1对20 mg/L腐殖酸、5 mg/L氨氮的微污染水降低率分别可达98%和20%以上。     

活性凹凸棒土/PVFM纳米复合材料的制备与性能研究

凹凸棒原土经提纯粉碎后,用硅烷偶联剂KH560进行表面改性,获得活性凹凸棒土纳米棒晶。用高速搅拌和超声波振荡的方法使活性纳米凹凸棒土均匀分散在聚乙烯醇缩甲醛(PVFM)泡沫海绵的基体中,制得活性凹凸棒土/聚乙烯醇缩甲醛纳米复合材料。用SEM观察了纳米凹凸棒土和复合材料的微观结构。通过物理力学性能测试表明:当活性纳米凹凸棒土填充量为6g/100g时,可以显著提高聚乙烯醇缩甲醛泡沫海绵的拉伸强度(2.68MPa)和吸水率(14.92g/g),降低材料的表观密度(76.8kg/m3)。     

膨胀珍珠岩/酚醛树脂轻质复合材料的制备及性能研究

以膨胀珍珠岩和热固性酚醛树脂为原料,盐酸磷酸混合酸为固化剂,制备膨胀珍珠岩/酚醛树脂轻质复合材料。运用单因素研究法探究了固化剂用量、加热成型温度、加热成型时间、主要原料的比例及酚醛树脂预热温度对轻质复合材料性能的影响。结果表明,固化剂用量为酚醛树脂质量的12%,固化温度为120℃,加热时间为2 h,酚醛树脂与膨胀珍珠岩的质量比为3.50时复合材料性能最优。其抗压强度为1.476 MPa,抗折强度为1.148 MPa,导热系数为0.048 W/(m·K),密度为320 kg/m3。     

高钛型高炉渣透水砖的制备及性能表征

这是一篇陶瓷及复合材料领域的论文。为实现高钛型高炉渣固废的再次资源化利用，解决大掺量高钛型高炉渣制备透水砖问题，本文以高炉渣为骨料，高岭土、钾长石为粘结剂和助融剂，经坯体成型、烧结制备了透水砖。采用TG-DSC综合热分析法、SEM形貌分析法研究了物料的热性能及高温下的形貌变化；讨论了高炉渣及辅料的配比、高炉渣骨料的粒度、成型压力、烧结温度、保温时间对透水砖性能的影响，确定了透水砖适宜的制备工艺参数。结果表明：选取高炉渣0.18～0.25 mm，高炉渣∶高岭土∶钾长石（质量分数）配比为75∶10∶15，成型压力为10 MPa，烧结温度为1 095℃，保温时间为3 h，此时透水砖的透水系数为0.064 cm/s，抗折强度为12 MPa，具备高透水性和高强度的特性，满足《透水路面砖和透水路面板》（GB/T25933-2010）的要求。     

含钛高炉渣资源化综合利用研究现状与展望

这是一篇陶瓷及复合材料领域的论文。为实现高钛型高炉渣固废的再次资源化利用,解决大掺量高钛型高炉渣制备透水砖问题,本文以高炉渣为骨料,高岭土、钾长石为粘结剂和助融剂,经坯体成型、烧结制备了透水砖。采用TG-DSC综合热分析法、SEM形貌分析法研究了物料的热性能及高温下的形貌变化;讨论了高炉渣及辅料的配比、高炉渣骨料的粒度、成型压力、烧结温度、保温时间对透水砖性能的影响,确定了透水砖适宜的制备工艺参数。结果表明：选取高炉渣0.18~0.25 mm,高炉渣∶高岭土∶钾长石（质量分数）配比为75∶10∶15,成型压力为10 MPa,烧结温度为1 095 ℃,保温时间为3 h,此时透水砖的透水系数为0.064 cm/s,抗折强度为12 MPa,具备高透水性和高强度的特性,满足《透水路面砖和透水路面板》（GB/T 25933-2010）的要求。     

以磷渣—磷尾矿为主要原料的保温板研制

磷渣和磷尾矿都是工业废弃物,它们的堆放不仅占用土地而且对环境构成潜在危害。通过研究磷渣与生石灰的比,水灰比,磷尾矿掺量,水泥用量等得到制备保温板的最佳配比:膨胀珍珠岩10%、磷尾矿60%、水泥3%、磷渣∶生石灰(质量比)=4∶1、水灰比0.24。按此配方配料,成型后经174.5℃、8h蒸压养护所制得的保温板,其容重为1.49g/cm3、抗折强度3.56MPa、抗压强度12.5MPa、导热系数0.143W/(m.K),超过了国标规定的指标。     

聚乙烯醇-魔芋葡甘聚糖/凹凸棒石复合材料的制备与性能

采用溶液共混法制备了聚乙烯醇-魔芋葡甘聚糖/凹凸棒石复合材料。探讨了聚乙烯醇用量(相对于魔芋葡甘聚糖质量分数,下同)、交联剂戊二醛用量和凹凸棒石用量对聚乙烯醇-魔芋葡甘聚糖/凹凸棒石复合材料力学性能的影响。力学性能测试结果表明,当聚乙烯醇用量为80%、交联剂戊二醛用量为3%、凹凸棒石用量为1%时,聚乙烯醇-魔芋葡甘聚糖/凹凸棒石复合材料的力学性能最好。FT-IR和SEM测试结果表明,复合材料中聚乙烯醇、魔芋葡甘聚糖和凹凸棒石之间存在强烈的相互作用和良好的相容性。     

膨胀珍珠岩/磷酸盐保温板材的制备及性能研究

以磷酸、氢氧化铝和膨胀珍珠岩为主要原料,以氧化镁和氧化锌为固化剂制备膨胀珍珠岩/磷酸盐保温板材。运用单因素研究法探究了胶黏剂基料制备温度和时间、样品的干燥温度和时间对保温材料性能的影响。采用X射线衍射和红外光谱技术研究了磷酸盐的固化机制。结果表明,磷酸盐胶黏剂在水浴85℃加热30 min制备;黏结珍珠岩板材的最优制备条件为140℃干燥2 h,其密度为260 kg/m3、导热系数为0.050W/(m·K)、抗压强度为0.63 MPa。     

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