水玻璃对偏高岭土基地质聚合物材料性能的影响

以800℃煅烧2 h得到高活性偏高岭土为原料,水玻璃为碱激发剂,双氧水为发泡剂,通过缩聚反应制备了偏高岭土地聚合物基轻质材料;当双氧水用量为0.25%,60℃固化24 h,水玻璃与偏高岭土用量比为1∶1时,地质聚合物轻质材料的强度最高;水玻璃模数在1.0~2.5范围内,随着水玻璃模数的增大,地质聚合物的体积密度先增大后减小,抗压强度与其体积密度成正相关关系,当水玻璃模数为1.2时,抗压强度为10.13 MPa,体积密度为1.25 g/cm3。     

高岭土基矿物聚合物材料的制备及抗压强度的影响因素

以高岭土、水玻璃和NaOH为原料,制备矿物聚合物材料,研究高岭土煅烧温度及掺量、水玻璃和NaOH的掺量、养护温度分别对矿物聚合物抗压强度的影响。结果表明,高岭土煅烧温度升高、掺量增大、水玻璃和NaOH的掺量的分别增大,矿物聚合物抗压强度均先增大后减小;提高养护温度,可以显著提高矿物聚合物的早期抗压强度,缩短养护时间;并讨论了各影响因素的作用机理。最后得出矿物聚合物的最佳合成条件为:高岭土在600℃煅烧4h,高岭土、水玻璃、NaOH的配比为7.5∶6∶1,在60℃下养护2h,抗压强度可达70MPa以上。     

矿渣和CaCl_2对偏高岭土地聚合物的力学性能影响

主要探究了矿渣和CaCl_2对偏高岭土地聚合物的力学性能的影响,实验中在偏高岭土地聚合物中掺入不同含量的矿渣和CaCl_2,在高温水浴养护条件下养护3d后测试抗压强度,实验结果证明,随着矿渣掺量的增多,可以明显地提高偏高岭土地聚合物的抗压强度,而随着CaCl_2掺量的增多,偏高岭土地聚合物的抗压强度呈下降趋势。     

RHA和PAN纤维对偏高岭土地聚合物性能的影响

以偏高岭土为主要原料,经碱激发作用后制备地聚合物,研究稻壳灰(RHA)和聚丙烯腈(PAN)纤维掺入对地聚合物力学性能的影响。结果表明:适量稻壳灰和PAN纤维的掺入,能有效提高偏高岭土地聚合物的力学性能。50 ℃养护14 d时,掺入20%稻壳灰偏高岭土地聚合物的抗压强度和抗折强度最高,分别较未掺稻壳灰试样提高了37.5%和30.6%。在此基础上,掺入1.5% PAN纤维地聚合物的抗折强度和抗冲击功最高,分别较未掺纤维试样提高了24.4%和43.5%。稻壳灰具有细化地聚合物孔隙的作用,有利于结构密实;PAN纤维穿插于地聚合物基体中,具有增韧改性的效果。     

粉煤灰基地质聚合物凝结时间的影响因素研究

以粉煤灰为原料,系统研究了水玻璃模数及掺量、水胶比、温度、外掺剂等参数对粉煤灰基地质聚合物凝结时间的影响。研究结果表明,随着温度升高,地质聚合物凝结时间显著降低; 在10 ℃条件下,地质聚合物凝结时间随着水玻璃掺量增加而增加,随水玻璃模数增加先增加后减小,水胶比对地质聚合物凝结时间影响较小,掺入Ca(OH)₂会促进地质聚合物的凝结。在粉煤灰掺量100%、水玻璃模数1.2、水玻璃掺量8%、水胶比0.35、养护温度10 ℃条件下,地质聚合物的初凝及终凝时间分别为65 min和114 min,在养护3 d和28 d后,地质聚合物的强度分别为23 MPa和51.7 MPa。     

含稀土尾矿制备无机矿物聚合物的试验研究

将含有稀土元素的尾矿作为掺合料制备新型无机矿物聚合物,通过对其砂浆试件各性能测试来探索其制备的工艺条件,结果表明,当尾矿掺量为30%,水玻璃模数为1.2,水玻璃掺量(以Na2O计)为4.5%时,液固比为0.6时试件的强度最大抗压强度达到48Mpa,抗折强度达到6.8Mpa     

煤系偏高岭土固化赤泥的强度试验研究

通过煤系偏高岭土固化赤泥,实现对赤泥的处理,达到以废治废的目的。通过对7 d、14 d、21 d、28 d、60 d、90 d共6个龄期下,6种不同煤系偏高岭土掺量的煤系偏高岭土固化赤泥复合体(RM-CMK复合体)抗压强度的测试,探究了煤系偏高岭土掺量和龄期对RM-CMK复合体强度的影响。研究表明:RM-CMK复合体的抗压强度随煤系偏高岭土掺量和龄期的增大而提高,基本符合线性关系。采用高斯-马尔科夫线性模型建立RM-CMK复合体抗压强度二元预测模型,建立RM-CMK复合体的抗压强度与龄期、煤系偏高岭土掺量两个因素的相关关系,实测值与预测值误差在5%左右。     

煤系高岭土固化拜耳法赤泥的强度机理研究

通过测试不同煤系偏高岭土掺量下,煤系偏高岭土固化拜耳法赤泥形成复合体的抗压强度,发现煤系偏高岭土可有效固化拜耳法赤泥。结合X射线衍射(XRD)、微观扫描电镜(SEM)及煤系偏高岭土水化的化学反应方程式,对复合体的物相组成和微观结构进行分析,阐明了煤系偏高岭土固化拜耳法赤泥的强度机理,利用强度机理解释了随着煤系偏高岭土掺量变化,宏观抗压强度变化的原因。     

某铅锌矿破碎带注浆加固之新型无机高强材料性能试验研究

随着开采深度的增加,对注浆材料的强度及固结效果提出了更高的要求,针对某铅锌矿破碎带对高强注浆材料的需求,研制一种新型无机高强材料,以增强注浆材料的强度及固结效果有利于提高开采的安全性,解决破碎带问题。以一种水泥基无机注浆加固材料为基础材料,对硅灰、矿粉、偏高岭土及聚丙烯纤维素四种添加剂的掺量开展正交试验,通过对单轴抗压强度、体积膨胀率极差、均值分析比较得出最佳配比。结果表明：硅灰掺量为0.2%、矿粉掺量为0.1%、偏高岭土掺量为12%、聚丙纤维素掺量为0.05%时,注浆材料强度、膨胀性最佳并且注浆材料固化体的韧性较好,3d、7d注浆材料的最大单轴抗压强度分别为57.47MPa、63.33MPa,体积膨胀率分别为2.78%、3.15%。研制的新型无机高强注浆材料的强度高、膨胀性好,且注浆材料固化体的韧性好,具有较高工程推广价值及应用价值。     

钢渣对碱激发偏高岭土材料强度影响分析

在水玻璃激发偏高岭土胶凝体系中,加入不同掺量的磨细钢渣,考察不同钢渣掺量对碱激发偏高岭土基复合胶凝材料的7 d抗折、抗压强度的影响,并对其影响机理进行分析。结果表明:随着钢渣掺量的增大,碱激发偏高岭土基复合胶凝材料的7 d抗折、抗压强度呈先增大后减小的趋势;当钢渣掺量在5%时,复合材料的7 d抗折强度达到最大值8.59 MPa,相较于空白组提高了10.2%;当钢渣掺量在7.5%时,复合材料的7d抗压强度达到最大值54.81 MPa,相较于空白组提高了20.9%;钢渣中的游离氧化钙与水反应生成氢氧化钙,对偏高岭土有一定的激发效果,进而提高碱激发偏高岭土基复合胶凝材料的力学强度。     

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 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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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.     

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     

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     

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.