纳米奠来石在水介质中的分散稳定性

以六偏磷酸钠作为分散剂，利用沉降实验研究了分散剂用量，pH值及超声处理时间对纳米莫来石在水介质中的分散稳定性的影响。结果表明：pH〉7、超声时间为10min（功率140W）、六偏磷酸钠的浓度为0．5％（wt）时，可以获得较稳定的分散。分散后纳米粒子团聚现象减小，粒子平均粒径从5μm减小为300nm，对纳米莫来石在水基涂料等方面的应用进行了初步探索。     

纳米铜粉在太阳能集热器循环工质中的分散

以阿拉伯树胶和六偏磷酸钠为分散剂,以乙二醇水溶液为分散介质,采用球磨分散法制备用作太阳能集热器循环工质的铜纳米流体.通过分光光度法和沉降法研究分散剂含量和球磨时间等因素对铜纳米流体稳定性的影响.结果表明,阿拉伯树胶和六偏磷酸钠均能有效的分散铜纳米颗粒,得到均匀、稳定的铜纳米流体.当用阿拉伯树胶作分散剂时,质量分数为0.25%、球磨时间为6h时,分散效果最佳.用六偏磷酸钠作分散剂,质量分数为0.1%、球磨时间为2h时,分散效果最佳.阿拉伯树胶对铜纳米颗粒的稳定分散作用主要是通过空间位阻机制来实现的,而六偏磷酸钠对铜纳米颗粒的稳定分散作用则主要是通过静电稳定机制来实现的.     

凹凸棒石超微分散及其在橡胶中的应用研究

采用超声波分散法制备了凹凸棒石纳米棒晶。研究结果表明：在六偏磷酸钠分散剂用量为2%、凹凸棒石矿浆浓度为12%、超声分散时间为25min、超声波功率为160W的条件下,凹凸棒石的分散效果最好,棒晶束聚集体被打开,成为纳米棒晶。采用乳液共混共凝法制备出了凹凸棒石/天然橡胶复合材料,该材料结构致密,经分散改性处理的凹凸棒石,基本上都呈纳米棒状较均匀地分布在天然橡胶基体中。     

盱眙凹凸棒石的超声分散影响因素分析

采用超声波对凹凸棒石进行超声分散,研究了分散剂聚丙烯酸钠用量、凹凸棒石矿浆浓度、超声时间、超声波功率以及超声波工作间隙对凹凸棒石超声分散效果的影响.试验数据表明,当分散剂聚丙烯酸钠用量为0.4%、凹凸棒石矿浆浓度为9%、超声时间为13min、超声波功率为180W、超声波工作间隙为12%的分散务件下,凹凸棒石的分散效果最好.透射电子显微镜(TEM)的分析结果表明,通过超声波分散后凹凸棒石基本上以单个棒晶形式分散,说明通过超声波作用可以破坏棒晶之间的聚集力,从而获得均匀分散的凹凸棒石纳米棒晶.     

微粒菱锰矿与脉石矿物互凝及化学分散作用的研究

本研究使用光电浊度法,扫描电镜和显微电泳仪等试验手段,研究了微粒菱锰矿与石英、方解石的互凝行为和机理及分散剂阻止矿物间互凝的作用和机理。研究阐明了六偏磷酸钠的分散作用机理是:以空间(位阻)效应导致的排斥作用为主,增加粒子表面负电性从而加大静电排斥力为辅,两者同时作用,导致微细粒矿物悬浮体处于分散状态。从而解释了六偏磷酸钠在作分散剂时,与其它分散剂相比,用量很小而分散能力很强的原因。     

马兰8~#煤分散—浮选试验中最佳分散剂的确定

针对泥质煤泥难浮选的问题,采用添加分散剂的方法,减轻泥质煤泥对浮选的影响。试验结果表明,4种分散剂由好到差的分散效果:六偏磷酸钠,单宁酸,水玻璃,氟化钠。其中,六偏磷酸钠浓度为5%,用量为1 100 g/t时,沉淀比(SR)值为0.979 9、析水时间之比(DTR)值为0.807 2、上清液吸光度(A)为2.40、Zeta电位值为-26.991,达到最佳分散效果,分散—浮选的精煤产率提高了3.77%,精煤灰分降低了1.18%,改善了浮选效果。     

超细铜粉的分散及其在导热膏中的应用研究

在测量超细铜粉Zeta电位的基础上,本文选用SHMP,OA,SDBS,PVP,PEG五种分散剂,系统研究了超声时间和分散剂浓度对超细铜粉在无水乙醇中分散性能的影响,进而又研究了超细铜粉的加入量、粒径大小、不同粒径铜粉复配等对导热硅脂导热性能的影响。实验结果表明,在无水乙醇中添加3wt.%的六偏磷酸钠超声50min,铜粉分散效果最好;随着超细铜粉添加量的增加和粒径的增大导热膏的导热系数均先增大后减小;当超细铜粉的总加入量为33wt.%, 且82nm和800nm的铜粉以3:1进行复配时,导热膏的导热系数最大为1.413 W/m.K,其导热性能最优。     

微 细 粒 赤 铁 矿 分 散 行 为 的 研 究

采用单矿物沉降试验,系统考察pH值以及六偏磷酸钠、硅酸钠、三聚磷酸钠和焦磷酸钠4种分散剂对微细粒赤铁矿分散行为的影响。通过DLVO理论计算,分析分散剂提高赤铁矿分散性能的作用机理。4种分散剂对赤铁矿分散能力的顺序为:三聚磷酸钠和焦磷酸钠>六偏磷酸钠>硅酸钠;氢氧化钠作为pH调整剂,与六偏磷酸钠和硅酸钠对微细粒赤铁矿的分散均具有协同作用。     

蒙皂石的湿式超细粉碎试验研究

蒙皂石是一种层状硅酸盐矿物。采用实验室卧式砂磨机对蒙皂石进了超细磨矿试验;研究了矿浆浓度、研磨时间、分散剂(六偏磷酸钠)的用量对磨矿效果的影响。结果表明,采用六偏磷酸钠为分散剂,蒙皂石湿式超细粉碎的适宜工艺条件为:矿浆浓度30%,研磨时间25min,分散剂用量0.6%。     

高纯超细凹土制备的分散剂筛选分析

采用分散剂协同超声水热法可以同时实现凹凸棒石粘土(下简称凹土)的纯化和超细化。实验比较了六种分散剂制备高纯超细凹土的效果，综合考察认为，六偏磷酸钠为制备高纯超细凹土的最佳分散剂。在六偏磷酸钠协助下，超声水热处理后的凹土粒度d90达4．7μm，白度由原来的45提高到87，X衍射实验表明凹土纯度接近100％。     

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     

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     

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.     

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.     

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     

2014 second batch of rare earth quota released

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