磷石膏膏体的流动特性试验及分析

开磷集团将磷石膏、黄磷渣与水混合制成流动性较好的磷石膏膏体,作为采空区的充填料,进行了磷石膏料浆的流动性试验,结果表明坍落度值随着其质量分数的降低而增大;料浆质量分数为68%左右时,有添加剂料浆的坍落度值明显高于无添加剂的料浆,而且,添加CaO比添加巴斯夫minefill501的变化效果更明显。工程实际生产时,可控制料浆质量分数范围在63%~67%。     

水基SiC料浆的分散稳定机制及喷雾造粒

以去离子水为液体介质,引入有机添加剂,配制水基SiC悬浮料浆,研究了水基料浆的分散稳定机制及其喷雾造粒行为,分析了有机添加剂和固相含量对料浆流变性能、造粒粉粒径分布及成型性能的影响机制.结果表明:当料浆pH≥10时,水基碳化硅料浆的分散性和稳定性较好,料浆具有剪切稀化的非Newton体特性:当加入0.2%(质量分数,下同)四甲基氢氧化铵、2.0%聚乙烯醇和1.0%聚乙二醇时,料浆黏度较小:固相含量为50%水基料浆喷雾造粒后,造粒粉的流动性、填充性能及成型性能明显提高,但球状造粒粉需要在一定成型压力下才能完全破碎.     

煤液化残渣制浆研究

对某煤液化残渣进行湿法成浆性实验研究,通过对煤液化残渣料浆在表观黏度、稳定性和流变特性方面的考察,认为在选取合适的添加剂和添加剂加入量的条件下,具备合理粒度分布的煤液化残渣能够制备出高质量分数符合湿法气流床气化工艺要求的料浆。     

有机添加剂对ZrO2流延生坯性能的影响

有机添加剂是流延料浆的关键组元,它们对料浆和流延生坯的性能有很大的影响.文章用流延法制备了YSZ电解质薄膜,并对生坯的力学性能进行了研究,分析了各有机添加剂对生坯力学性能的影响,最终提出了提高生坯及烧结体质量的方法.     

适用于卫生瓷、日用瓷料浆浇注反絮凝作用的分散剂

1、引言在近代的陶瓷工业中,无论是日用瓷或卫生瓷至今存在的一个问题就是控制料浆的浇注。谈到陶瓷方面的工艺技术,很快使我们联想到控制料浆絮凝阶段的材料,一般是使用水玻璃作为添加剂(硅酸钠 Na_2SiO_3)。但是水玻璃并不是控制料浆浇注的唯一的添加剂,另外还有其它的化学制剂诸如:纯碱(碳酸钠 Na_2     

有机添加剂对氧化铝造粒粉性能的影响

讨论了有机添加剂对氧化铝造粒粉性能的影响,实验结果表明：S分散剂对氧化铝陶瓷料浆的稳定分散作用最好,适宜的添加量为0.3％-0.5％;PVA添加量为1.2％-1.5％时,料浆的粘度适中,适合喷雾造粒;消泡剂BYK-603的适宜添加量为0.2％-0.4％。另外,PH值对料浆的稳定性也起到非常重要的作用,料浆偏弱酸性时稳定...     

功能添加剂对不饱和聚酯包覆剂黏度和凝胶时间的影响

应用旋转流变仪和凝胶时间测定仪研究了不同功能添加剂对不饱和聚酯(UP)包覆层料浆的黏度和凝胶时间的影响.结果表明,粉状填料可提高UP包覆层料浆的黏度,层状硅酸盐(MMT)对包覆层料浆黏度影响最大,Sb2O3的影响最小；芳纶纤维(PPTA)和碳纤维(CF)均能显著影响UP包覆层料浆的黏度,当PPTA和2mmCF的质量分数...     

有机添加剂在陶瓷瘠性料浆中的应用研究

本文根据特陶泥浆、全熔块釉浆等系统的解凝实验结果,对有机添加剂在陶瓷瘠性料浆的选择、应用进行了讨论,并对其作用机理进了理论探讨。     

HANa-AANa共聚物作为多功能陶瓷添加剂的研究

通过自由基水溶液微波共聚法合成了腐植酸钠-丙烯酸钠(HANa-AANa)共聚物,将之应用于陶瓷料浆及坯体中,研究了HANa-AANa共聚物对陶瓷料浆流动性、坯体可塑性及坯体干燥强度的影响。通过和腐植酸钠的对比研究表明,HANa-AANa共聚物是一种较好的陶瓷多功能添加剂,对料浆具有良好的解凝性,同时对坯体具有较大的增塑、增强效果。     

酸性磷铵料浆流变行为的研究（Ⅰ）

对磷铵酸性料浆的流动性及流变机理进行了研究。揭示湿法磷酸氨化过程中粘度随中和度变化的规律。当料浆含水量逐渐降低时 ,随磷铵晶体的析出 ,料浆逐渐由牛顿型流体向非牛顿型流体转变 ,剪切变稀的现象逐渐明显 ,而温度升高料浆粘度则降低。     

氯化铈和碘化钾组成的复合添加剂对化学镀镍层耐蚀性能的影响

在添加复合添加剂(CeCl3+KI)的条件下进行化学镀镍.用扫描电镜(SEM)、X射线衍射(XRD)、动电位极化测量和电化学阻抗谱,研究了复合添加剂对镀层的影响.结果表明:复合添加剂可使镀层更加致密和均匀,腐蚀电流密度减小,电荷转移阻力增大,镀层的耐蚀性提高.     

CaCl2-NaCl混合助剂分解钾长石提取钾的实验研究

CaCl2和NaCl按一定比例混合作助剂焙烧分解钾长石提钾,对产物的物相组成及分解反应过程进行了研究. 结果表明,混合助剂能缩短分解反应达到平衡的时间,在较低的焙烧温度和较短的焙烧时间下获得较高的提取率,且温度越低或时间越短效果越明显,在焙烧温度800℃、焙烧时间60 min的条件下,混合助剂的钾提取率为93.65%,比CaCl2高22.57%,比NaCl高39.56%. 超过700℃后,体系进入快速反应阶段,混合助剂有效降低了分解反应温度,适宜的焙烧温度为800~890℃.     

高锰酸钾复剂对给水处理中混凝的强化效应

通过混凝处理前采用高锰酸钾复合药剂预处理,考察了其对混凝水处理的强化效应。实验结果表明:高锰酸钾复合药剂预处理对混凝处理具有很好的强化效应,能显著提高混凝过程对浊度、有机物等污染指标的去除效率,改善出水水质,当高锰酸钾的用量为0.25mg/L时,聚合氯化铝和硫酸铝的投加量分别减少30%和40%。     

高锰酸盐复合药剂的制备及其强化混凝的效能

以高锰酸钾为主剂．研究了高锰酸盐复合药剂中三种成分的配比,同时考察了其对混凝处理的强化效应。研究结果表明：与常规的混凝处理及仅投加高锰酸钾预氧化的混凝处理工艺相比,高锰酸盐复合药剂预氧化对混凝处理具有很好的强化效应,能显著提高混凝对浊度、有机物等污染指标的去除效率。在达到相近的出水水质时,投加0．8mg／L的高锰酸钾、10mgm的A组分和8mg／L的B组分,聚合氯化铝的投加量约减少50％。     

Utilization of ZSM-5/MCM-41 composite as FCC catalyst additive for enhancing propylene yield from VGO cracking

A micro-mesoporous ZSM-5/MCM-41 composite molecular sieve (ZM13) was synthesized and tested as an FCC catalyst additive to enhance the yield of propylene from catalytic cracking of vacuum gas oil (VGO). The catalytic performance of the additive was assessed using a commercial equilibrium USY FCC catalyst (E-Cat) in a fixed-bed micro-activity test unit (MAT) at 520?°C and various catalyst/oil ratios. MCM-41, ZSM-5 and two ZSM-5/MCM-41 composites were systematically characterized by complementary techniques such as XRD, BET, FTIR and SEM. The characterization results showed that the composites contained secondary building unit with different textural properties compared to pure ZSM-5 and MCM-41. MAT results showed that the VGO cracking activity of E-Cat did not decrease by using these additives. The highest propylene yield of 12.2 wt% was achieved over steamed ZSM-5/MCM-41 composite additive (ZM13) compared with 8.6 wt% over conventional ZSM-5 additive at similar gasoline yield penalty. The enhanced production of propylene over composite additive was attributed to its mesopores that suppressed secondary and hydrogen transfer reactions and offered easier transport and accessibility to active sites. Gasoline quality was improved by the use of all additives except MCM-41, as octane rating increased by 6?C12 numbers.     

连续电解精炼阴极铜过程中添加剂的作用

采用循环伏安法研究了浓度不同的几种添加剂(硫脲、聚丙烯酰胺、明胶和骨胶)对铜电解精炼过程的影响。结果发现,与未加添加剂的空白电解液相比,加入单一添加剂后铜沉积电流峰值明显提高,表明单一添加剂的加入会促进阴极铜的沉积。当在电解液中加入3.0 mg/L硫脲和2.4 mg/L聚丙烯酰胺作为复合添加剂时,铜沉积电流峰值与加入单一硫脲与聚丙烯酰胺时相比分别提高了31.2%与5.1%,表明二者有协同作用。结合扫描电镜(SEM)、能谱(EDS)和X射线衍射(XRD)对阴极铜的微观形貌、元素组成与物相进行表征,发现使用上述复合添加剂时,阴极铜的表面形貌与纯度最理想。     

复合添加氮化钛和铝粉对镁碳砖高温性能的影响

首先研究了氮化钛(TiN)加入量(分别外加质量分数1%、2%和3%)对镁碳砖高温性能的影响,然后在确定其加入量的基础上研究了复合加入TiN和Al对镁碳砖高温抗折强度、抗氧化性和抗渣侵蚀性等高温性能的影响,并分析了渣蚀后试样的化学组成及物相变化。结果表明:镁碳砖中外加TiN的质量分数以不超过2%为宜;TiN和Al复合加入到镁碳砖中,可使镁碳砖的高温抗折强度、防氧化效果和抗渣侵蚀性等高温性能均有很大提高,且以复合外加2%质量分数TiN和1%质量分数Al的镁碳砖试样综合高温性能最佳。     

添加剂改性玉米醇溶蛋白复合膜的制备与表征

采用流延法制备高含量玉米醇溶蛋白（Zein）的Zein/壳聚糖（CS）复合膜，通过复合添加剂〔m(甘油)：m(聚乙二醇400)=1:1〕对Zein/CS复合膜共混改性，研究复合添加剂添加量（以总溶液质量计，分别为0、0.5%、1.0%、1.5%、2.0%）对薄膜的力学、光学和热学性能等的影响，并通过SEM、FTIR对薄膜形貌和结构变化进行表征。结果表明，复合添加剂通过削弱Zein和CS之间的分子间作用力，达到增塑效果，薄膜综合机械性能有所改善，随着复合添加剂添加量的升高，薄膜断裂伸长率逐渐增强，拉伸强度呈下降再上升的趋势；水蒸气透过率逐渐增加，水接触角逐渐减小，薄膜亲水性随之增强。与不含复合添加剂的薄膜（ZC-0）相比，当复合添加剂添加量为1.5%时，复合膜（ZC-1.5）的抗拉强度降低了27.40%，断裂伸长率增长了39.87%，水蒸气透过率上升了29.10%。通过SEM和DSC观察，添加复合添加剂改性后，改善了Zein和CS之间的相容性，制备的薄膜表面更加平整光滑。综合性能可得，制备高含量Zein的Zein/CS复合膜，复合添加剂浓度为1.5%时，薄膜性能最优。并在含有1.5%复合添加剂的Zein/CS薄膜中添加了一定量的姜黄素，据测定其能够有效提高薄膜的抗氧化性能至55.18%。     

The influence of activated carbon as an additive in anode materials for low temperature solid oxide fuel cells

The effects of activated carbon (AC) as an additive in multi-oxide nano composite LiNiCuZn–O for application as anode in solid oxide fuel cell (SOFC) is reported. The composite was synthesized using solid state reactions method with varying content of AC in range 0.1%–0.9% for use as anode in the cell. The cell was composed of the synthesized composite as anode, LiNiCuZn–O as cathode and Samaria doped ceria (SDC) as electrolyte. The prepared composites were characterized for morphology and crystal structure by scanning electron microscope (SEM) and x-ray diffraction (XRD) respectively. Furthermore, the crystallite sizes of LiNiCuZn–O and LiNiCuZn–O with AC as an additive have been found in the range from 50 nm to 70 nm. The prepared composite materials were observed porous and the porosity of the sample having 0.5% additive was found highest. The conductivity and power density of the SOFC were studied at temperature of 600 °C. The maximum value of conductivity was found as 4.79 S/cm for the composite containing 0.5% AC as measured by using 4-probe method. The maximum value of power density of the fuel cell with anode comprising of 0.5% AC along with the mentioned cathode and the electrolyte was 455 mW/cm². Therefore, out of the compositions studied, the composite comprising of LiNiCuZn–O with 0.5% AC offered best performance for anode in the cell. This oxide composite is reported as a potential candidate for use as anode in low temperature SOFCs.     

Influence of interfacial adhesion on stress-strain properties of highly filled polyethylene

This paper studied the structure and properties of highly filled polyethylene/magnesium hydroxide composite. A third additive component was introduced to alter interfacial adhesion. Scanning electronic microscopy proved that the filler particles were totally surrounded by additive material. Interfacial adhesion played an essential role in determining the fracture mechanism and, consequently, the mechanical properties of the composites. The composites with good interfacial adhesion had high tensile strength and relatively low elongation at break. Conversely, a poor interfacial adhesion led to a composite with low tensile strength and high elongation.