高效液膜分离富集镍基合金镀层中稀土总量

用ＴＢＰ－ＴＴＡ（协同流动载体）、ＳＰＡＮ８０和煤油高效液膜体系，研究∑ＲＥ＾３＋迁移行为。在适宜条件下，１０ｍｉｎ内，∑ＲＥ＾３＋的迁移率达９９．５％以上。在同样条件下，常见共存金属离子如Ｆｅ＾３＋、Ａｌ＾３＋、Ｎｉ＾２＋、Ｃｒ＾３＋、Ｍｏ＾６＋、Ｃｕ＾２＋、Ｃｏ＾２＋、Ｚｎ＾２＋、Ｃｄ＾２＋等均不被迁移；大量碱金属、碱土金属、Ｃｌ、ＮＯ３、ＣｌＯ４、Ｆ、ＳｉＯ３＾２－、ＳＯ４＾２－等离子也不影     

2－（2－噻唑偶氮）－5－［（N，N－二羧基甲基）氨基］．苯甲酸的合成及其光度特性的研究

合成了一种新的水溶性显色剂２－２－噻唑偶氮）－５－［（Ｎ，Ｎ－二羧基甲基）氨基］苯甲酸（ＴＡＤＣＡＢ）。试验了试剂与２９种金属离子的显色反应，其中１１种离子能显色；同时测定了试剂的离解常数、试剂与ＣＯ２＋、Ｃｏ２＋、Ｎｉ２＋、Ｐｄ２＋、Ｖ（Ｖ）络合物的络合比、稳定常数和摩尔吸光系数等特性数据。     

Al2O3-CoCrAlY 复合陶瓷激光熔覆层的组织与性能

研究了Ａｌ２Ｏ３－ＣｏＣｒＡｌＹ复合陶瓷涂层的组织结构、成分分布及其耐磨性能。结果表明：等离子喷涂层的组织呈层片状,面层由α－Ａｌ２Ｏ３和少量的γ－Ａｌ２Ｏ３组成,层间为机械结合界面,涂层平均硬度为８９７ＨＶ０．２。经激光重熔后的组织为单一的α－Ａｌ２Ｏ３柱状晶,在ＣｏＣｒＡｌＹ与基体间有界面相形成,其界面为冶金结合,层间存在着平缓的成分过渡;Ａｌ２Ｏ３与ＣｏＣｒＡｌＹ间的界面结合状况得到了明显的     

2—（2—噻唑偶氮）—5—[N,N—二羧基甲基）氨基]苯甲酸的合成及其光度特…

合成了一种新的水溶性显色剂２－（２－噻唑偶氮）－５－［Ｎ，Ｎ－二羧基甲基）氮基］苯甲酸。试验了试剂与、２９种金属离子的显色反应，其中１１种离子能显色；同时测定了试剂的离解常数、试剂与Ｃｕ％２＋，Ｃｏ＾２＋，Ｎｉ＾２＋，Ｐｄ＾２＋，Ｖ（Ｖ）络合物的络合比、稳定常数和摩尔吸光系数等特性数据。     

新试剂1—羟基—2—（6—溴—2—苯并噻唑偶氮）—8—氨基—3,6—萘二磺酸…

新苯并噻唑偶氮试剂－１－羟基－２－（６－溴－２－苯并噻唑偶氮）－８－氨基－３，６－萘二磺酸的合成方法简单，提纯容易，产率达７３％。试剂的ｐＫａ３为６．７５。是一个变色敏锐的酸碱指示剂，也可用作Ｃｕ＾２＋，Ｃｏ＾２＋，Ｎｉ＾２＋等金属离子的显色剂。     

非水系中钴和镧钴合金的电沉积

研究了在含Ｃｏ（Ⅱ）或含Ｃｏ（Ⅱ）＋Ｌａ（Ⅲ）的尿素－ＮａＢｒ－ＫＢｒ－甲酰胺体系中钴和镧钴合金的电沉积过程。测定了该体系中电极反应Ｃｏ（Ⅱ）十２ｅ＝Ｃｏ的传递系数及ＣＯ（Ⅱ）的扩散系数。在铜基体上得到含镧达５０Ｗｔ％的镧钴合金电沉积层。     

BTAM分光光度法测钴

研究了新合成的显色剂２－（２－苯并噻唑偶氮）－间二甲氨基酚（ＢＴＡＭ）与ＣＯ２＋的显色反应。在阳离子表面活性剂溴化正辛基三甲基铵及乳化剂ＯＰ存在下，生成紫红色配合物，组成比Ｃｏ：ＢＴＡＭ为１：２，最大吸收波长５４０ｎｍ，摩尔吸光系数２．３４×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，不稳定常数５×１０－１５，Ｃｏ２＋在０～２．ｏμｇ／１０ｍＬ范围内符合比尔定律，Ｎｉ２＋、Ｆｅ３＋、Ｃｕ２＋、Ｚｎ２＋有一定的干扰。方法用于维生素Ｂ１２、工业废水，合金钢中钻含量测定，结果令人满意。     

定氧电池氧化锆电解质中的氧位分布与参比电极的选择

用稳态法求得氧化锆固体电解质内的氧位分布，从理论上阐明了钢液定氧电池参比电极的选择原则，在１６００℃下，钢液含氧量小于３００×１０＾－６时，Ｃｒ／Ｃｒ２Ｏ３参比电极优于Ｍｏ／ＭｏＯ２参比电极，而钢液含氧量大于３００×１０＾－６时，使用Ｍｏ／ＭｏＯ２参比电极比Ｃｒ／Ｃｒ２Ｏ３参比电极的误差更小，氧含量极低时，不宜采用Ｍｏ／ＭｏＯ２作参比电极。     

两种S——烃基异硫脲盐酸盐萃取行为的研究

以Ｓ－十六烷基异硫脲盐酸盐和Ｓ－苄基异硫脲盐酸 固定相，以不同浓度盐酸为展开剂，用反相纸层析法研究了两种萃取剂分别对２５种金属离子的萃取能力。结果表明：在不同酸度时，Ｓ－十六烷基异硫脲盐酸盐对Ｓｒ＾２＋、Ｂａ＾２＋等８种金属离子，Ｓ－苄基异硫脲盐酸盐对Ｍｇ＾２＋、Ｃａ＾２＋等７种金属离子的萃取能力较强。     

合成Co2O3—Cr2O3—F32O3—MnO2系高温黑颜料最佳工艺条件的探讨

本文介绍了Ｃｏ２Ｏ３－Ｃｒ２Ｏ３－Ｆｅ２Ｏ３－ＭｎＯ２系高温黑颜料的合成工艺，研究分析了四种氧化物的不同配比、混合及合成温度等工艺过程对颜料呈色的影响，从而确定了含钴量较低呈色纯正的Ｃｏ－Ｃｒ－Ｆｅ－Ｍｎ系高温颜料的最佳工艺条件，并利用过渡金属络合物吸收光谱理论对Ｃｏ、Ｃｒ、Ｆｅ、Ｍｎ四种元素的变价离子使含Ｂdisplay status     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

用两个形状指数表征粉煤灰颗粒形貌的研究

引用两个形状指数表征颗粒形状的概念,即先将颗粒形状近似为椭圆,再将椭圆图像分离:以圆为基准的颗粒宏观形状指数δ;以光滑椭圆为基准的颗粒轮廓凹凸度,即微观形状指数ζ。分析和发展了近似椭圆模型。并运用图像分析仪对粉煤灰、水泥样品进行实验。结果表明,粉煤灰颗粒的两个形状指数δ和ζ都大于水泥颗粒。证明粉煤灰颗粒的球形度、表面光滑度优于水泥,而且,随着粒径增大,δ和ζ呈下降趋势,表明磨制颗粒越粗。(?)粒形状越不规则。文中还运用近似椭圆模型再现了颗粒的模拟图像。