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。     

铁尾矿基轻质高强陶粒的制备及应用研究

以铁尾矿为主要原料烧制轻质高强度陶瓷颗粒,研究铁尾矿含量、发泡剂添加量和烧成温度对陶粒性能的影响.结果表明,采用100％铁尾矿为原料,0.1％碳化硅(SiC)为发泡剂,在1150℃保温20 min,制得陶粒的堆积密度为0.99 t/m3,筒压强度为16.3 MPa,吸水率为4.25％.再以此陶粒作为骨料制备陶粒混凝土,...     

利用铁尾矿制备发泡水泥

为提高铁尾矿的利用率,以普通硅酸盐水泥为基质材料,铁尾矿为掺和料,通过化学发泡法制备发泡水泥。研究了铁尾矿掺量、发泡剂用量、水灰比、硬脂酸钙等因素对发泡水泥抗压强度和密度的影响,并确定最佳原料配比。结果表明,原料最佳配比为:铁尾矿55%,普通硅酸盐水泥45%,发泡剂8%,硬脂酸钙0.35%,聚丙烯纤维0.3%,在水胶比为0.43的条件下,发泡水泥7 d和28 d抗压强度分别为1.35 MPa和1.65 MPa,干密度为698.25 kg/m~3。     

外墙泡沫保温材料的技术现状及用铁尾矿试制

铁尾矿的大量堆存对于环境和经济的可持续发展造成重大威胁。在国家提倡外墙保温材料革新以及铁尾矿资源化利用的背景下,将铁尾矿制成多孔矿物聚合材料用于外墙保温,不但能实现建筑节能,而且可以改善生态环境。在介绍了国内外对于外墙泡沫保温材料研究现状的基础上,进行了铁尾矿外墙泡沫保温材料的试制。试验中以鞍山式铁尾矿为主要原料,用偏高岭石调节Si/Al摩尔比,双氧水为发泡剂,硅酸钠为碱激活剂,试制出了具有一定性能和外观的外墙泡沫保温材料,可以用于建筑外墙保温,说明了试验技术路线的可行性。但是,若要制成满足建筑要求并且成本低的外墙泡沫保温材料,还需要后续进行原料的配体优化以及反应条件的调节等一系列试验。     

山西某碱铝硅质型铜尾矿制备高强陶粒的正交试验研究

我国尾矿资源的综合利用一直是一个难题。以山西某碱铝硅质型铜尾矿为主要原料制备了高强陶粒轻集料。基于原料化学成分分析进行物料配比试验、粉磨试验、造粒试验及设计L₁₆（45）烧成制度正交试验研究,结果表明,优选试验配方（质量配比）为:铜尾矿50%、长石25%、白云石10%、废弃土15%、黏结剂水玻璃的用量（原料质量比）为5%。确定最优烧成制度为:预热温度800℃、预热时间20 min、烧成温度1 170℃、烧成时间15 min。最终烧制出的尾矿陶粒轻集料堆积密度为874 kg/m3,筒压强度达到7.5 MPa,吸水率为2.1%,为铜尾矿的高附加值综合利用提供了一个新的解决方案。      

偏高岭土制备外墙保温材料试验

市场上现有无机保温材料导热系数低、保温性能差,为此,以偏高岭土为主要原料、水玻璃为碱激发剂、双氧水为发泡剂,通过聚合反应制备新型外墙保温材料,考察水玻璃用量、发泡剂用量和养护温度对保温材料密度、抗压强度和导热系数的影响。结果表明：当水玻璃与偏高岭土质量比为1.0、双氧水用量为偏高岭土质量的2%、养护温度为60 ℃时,获得的保温材料导热系数为0.115 W/(m·℃)、密度为356 kg/m3、抗压强度为0.821 MPa。试验结果可以为偏高岭土制备外墙保温材料工艺提供技术支持。     

钻井岩屑烧制轻质高强陶粒的研究

采用钻井岩屑为主要原料,加入黏土、钾长石,结合发泡剂经高温烧成得到轻质高强陶粒,对陶粒的堆积密度、筒压强度、吸水率、放射性和有害元素浸出量进行测试。结果表明,采用80%钻井岩屑,10%黏土和10%钾长石,添加原料总质量0.4%的发泡剂,在1 110℃下烧成保温10 min,可制备筒压强度11.3 MPa、堆积密度732 kg/m~3、吸水率4.6%的轻质高强陶瓷颗粒,其放射性及有害元素浸出量均满足国家标准要求。     

全尾矿基轻质发泡陶瓷的制备及正交试验研究

以四川某钒钛磁铁矿浮选尾矿、长石尾矿和高岭石型硫铁尾矿为主要原料,制备轻质发泡陶瓷.基于原料化学成分分析进行物料配比、磨矿细度、SiC用量试验及L16(44)烧成制度正交试验.结果表明,优选试验质量配比为:钒钛磁铁矿尾矿30％、长石尾矿50％、高岭石型硫铁尾矿20％,外掺发泡剂碳化硅质量分数0.4％.确定最优烧成制度为...     

生活垃圾焚烧飞灰-粉煤灰基多孔保温材料的制备

以生活垃圾焚烧飞灰和粉煤灰作为原料, 以油酸钠为稳泡剂、双氧水为发泡剂制备多孔保温材料, 研究了原料配比、添加剂用量等因素对多孔保温材料抗压和隔热性能的影响。研究结果表明, 在飞灰/粉煤灰配比1∶1、油酸钠用量0.4%、水玻璃模数2.5、水玻璃用量10%、双氧水用量2%、水添加量40%条件下, 制备的多孔保温材料抗压和隔热性能优异, 其抗压强度和导热系数分别为0.48 MPa和0.091 W/(m·K)。     

铁尾矿制备轻质隔热保温建筑材料的研究

介绍了新型轻质隔热保温材料的制备工艺,以铁尾矿、废旧聚苯乙烯泡沫为主要原料,普通硅酸盐水泥为胶凝剂,制备轻质隔热保温材料.试验研究表明,当铁尾矿/(水泥 铁尾矿)取40%、泡沫/(水泥 铁尾矿)取4%、水/水泥取0.48时,所制备的试块7 d抗压强度可达0.94 MPa,28 d抗压强度可达1.05 MPa,而干燥容重仅740.6 kg/m3,导热系数仅0.109 W/(m·K),为综合利用尾矿和废弃泡沫提供了一条新的技术途径.     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel