PAR作指示剂配位滴定硅酸盐样品中的铝

本文研究了以4－（2－吡啶偶氮）－间苯二酚（PAR）为指示剂，配位滴定硅酸盐样品中的铝的方法。实验结果表明：在pH4．3的HAC－NaAc酸性介质中，终点变色灵敏、准确度高。用于硅酸盐样品中铝的测定结果准确可靠。     

用BTAEB作指示剂配位滴定硅酸盐样品中的铝

本文研究了以２－［２－苯骈噻唑偶氮］－５－二乙氨基苯甲酸（ＢＴＡＥＢ）为指示剂，配位滴定硅酸盐样品中的铝的方法。实验结果表明，在ｐＨ３．８￣６．０范围内，终点变色灵敏、准确度高。用于硅酸盐样品中铝的测定结果准确可靠。     

用BTAEB作指示剂配位滴定硅酸盐样品中的铝

本文研究了以2—[2—苯骈噻唑偶氮]—5—二乙氨基苯甲酸（BTAEB）为指示剂，配位滴定硅酸盐样品中的铝的方法。实验结果表明，在PH3．8～6．0范围内，终点变色灵敏、准确度高。用于硅酸盐样品中铝的测定结果准确可靠。     

PAR作指示剂配位滴定硅酸盐样品中的铝

本文研究了以４－（２－吡啶偶氮）－间苯二酚（ＰＡＲ）为指示剂，配位滴定硅酸盐样品中的铝的方法。实验结果表明：在ｐＨ４．３的ＨＡｃ－ＮａＡｃ酸性介质中，终点变色灵敏、准确度高。用于硅酸盐样品中铝的测定结果准确可靠。     

提高立窑水泥质量的技术措施

我厂的生料磨，水泥磨都是Φ2．2m*6.5m带离心式选粉机的闭路系统，立窑规格是直径2．9m*10m和直径2．5m*10m盘塔式机立窑各1台，熟料月平均标号稳定在59．5－62．5MPa，主导产品425号复合硅酸盐水泥一等吕率达到80％以上，525号普通硅酸盐水泥一等吕率达100％，实施ISO水泥强度检验法后，熟料3d和28d抗压强度分别吓降5－7Mpa和7－12MPa抗折强度分别下降0．5－1．0MPa，和0．5MP,a为此，我厂主要从以下几方面采取措施。     

N-丁基-3-甲酰胺基-4-甲基-6-羟基-2-吡啶酮的HPLC测定

研究了用高效液相色谱测定N－丁基－3－甲酰胺基－4－甲基－6－羟基－2－吡啶酮含量的方法，样品在ODS柱上分离，流动相为含0．2％四丁基氯化铵的甲醇－水体系，流速为1．0mL/min，紫外254nm检测，方法简便，快速，测定的变异系数为0．5％－0．9％。     

钛铁试剂分光光度法连续测定陶瓷材料中的铁和钛

研究了钛，铁与钛铁试剂的显色反应。该分析方法的最大优点是可在同一溶液中用光度法连续测定样品中的钛和铁含量。配合物最大吸收波长分期为410nm和565nm，二氧化钛含量在0－200μg/50ml，三氧化二钛含量在0－300μg/50ml范围内符合比尔定律。方法用于测定硅酸盐样品中钛和铁，结果满意。     

3,5—diBr—PADAT作指示剂配位滴定硅酸盐样品中的铝

Studieson3,5-diBr－PADATasaMetallochromicIndicatorforAluminiuminSilicateSamples1前言硅酸盐样品中铝的含量通常采用EDTH配位滴定-CuSO4回滴法测定，为了改善PAN的终点，消除其僵化现象，我们曾采用表面活性剂增溶来改善滴定的终点[1]，并采用磺化法制备的水溶性良好的PAN     

一种高烧结活性氧化铝粉体的制备方法

本发明提供了一种制备高烧结活性氧化铝粉体的方法。其特征在于以含铝无机盐为主要原料，碳酸氢铵为沉淀剂，生成NH4Al(OH)2CO3，更确切地说，铝无机盐为硝酸铝，氯化铝和硫酸铝铵中一种，含铝的无机盐浓度为0．1－1mol/L，碳酸氢铵浓度为1-4mol/L，反应温度为5－50℃，沉淀陈化时间2－24h，沉淀物经去离子水洗涤至无在1100－1200摄氏度煅烧，使之转变为α－Al2O3，晶粒尺寸小于400nm的亚微米及纳米级氧化铝粉体，该方法制取的氧化铝粉体具有硬团聚少和烧结活性高的特点，非常适合于高档氧化铝陶瓷材料的制备。     

DDTC-MIBK萃取火焰原子吸收法测定铜

研究二乙基二硫代氨基甲酸钠－甲基异丁基甲酮（DDTC－MIBK）体系萃取溶液中铜（Ⅱ），火焰原子吸收测定微量铜的方法，测定的灵敏度为0．028μg/ml/1％吸收，检出限为0．020μg/ml，线性范围为0－5．0μg/ml。标准铜加入样品后的回收率为98．2％－105％，相对标准偏差3．07－5．56％，成功地测定了新鲜水果及桔子，黄桃等罐头食品中的微量铜。     

以5-Br-PAN-S作配位滴定指示剂间接测定矿物中铝和钛

对以 5 Br PAN S作配位滴定指示剂测定矿物中的铝、钛进行了研究。在 pH值为 5 .5时 ,用过量的EDTA与Al3 、TiO2 充分配位 ,加入氟化铵使两者的EDTA都释放出来 ,测铝钛总量。再取另一份试液加入苦杏仁酸 ,释放出TiOY2 - 中的EDTA ,可测钛量。终点变色敏锐 ,准确度高 ,选择性好。此方法可用于矿物中铝、钛的测定 ,结果满意。     

可溶性硅酸钠盐水溶液对金属腐蚀性分析

为研究可溶性硅酸钠盐水溶液对金属的腐蚀特性,用钢片和铝片作为测试试样,用金属腐蚀性测试仪对其一周腐蚀速率进行了分析。分别考察了3种不同模数的硅酸钠盐在5种不同浓度时对钢片试样和铝片试样的腐蚀情况。结果表明,可溶性硅酸钠盐水溶液对钢不具有腐蚀性,对铝产生较强的腐蚀性,且对铝的腐蚀性为吸氧腐蚀,腐蚀从气液界面开始,然后向周围蔓延,出现先均匀腐蚀后点蚀的现象。硅酸钠模数大于等于3时,其水溶液对铝的腐蚀性较小,未达到金属腐蚀物的范围。模数小于等于2时,其水溶液对铝的腐蚀速率较快,当质量分数达到一定范围,即可划入金属腐蚀物。同时给出了划入金属腐蚀物的质量分数范围,为日常生产、储存、使用、监管和运输提供了重要的参考。     

A study on adsorption of poly(methyl methacrylate) on aluminium silicate

Effect of temperature, solvent power, and molecular weight on the adsorption of poly methyl methacrylate (PMMA) on aluminium silicate has been studied. Kinetics of adsorption have been also investigated at 30° and 45 °C. The values of rate constants at these temperatures are 1.4 · 10^?2 and 1.0 · 10^?2 min^?1 respectively. The adsorption data have been analysed according to the Langmuir and the Simha -Frisch -Eirich (SFE) isotherms. The results could be adequately explained in terms of the Langmuir isotherm.     

Ageing of some high surface area solids

The ageing (fall in surface area) of samples of aluminium hydroxide has been studied by observing the changes in surface area and porous texture revealed by nitrogen adsorption. Ageing was carried out over phosphorus pentoxide and at 33% r.h. The effect of this change in r.h. depended on the texture of the aluminium hydroxide. Ageing was faster at 33% r.h. in the amorphous form which contained discrete flocs. Pseudoboehmite behaved as a true xerogel and some samples even increased in surface area by swelling when stored at the higher humidity. Some data for calcium silicate hydrates and samples of a commercial pyrogenic silica are included for comparison. The former were prepared in powder and paste (xerogel) form. The two forms responded differently to the two humidities but in the opposite sense to the corresponding aluminium hydroxide textures: thus the surface area of pastes fell more rapidly at the higher r.h. The surface area of samples of the silica fell when they were stored normally in air tight containers. They eventually reached steady values and a reduction of a similar magnitude could be produced rapidly by agglomerating the spherical particles in hot water. Mechanisms of ageing involving simple adhesion and its reverse depending on r.h., hydroxyl group condensation, and sintering aided by dissolution or surface diffusion are discussed.     

Cementitious mixtures containing industrial process wastes suitable for the manufacture of preformed building elements

Mixtures made from materials containing reactive oxides of calcium, aluminium, sulphur and silicon which are able, upon hydration, to generate calcium trisulphoaluminate and silicate hydrates, have been studied with a view to possible applications in the field of preformed building elements. The materials employed were natural gypsum, phosphogypsum, fly ash, blast furnace slag, Portland cement and hydrated lime. The samples were cured at 55, 70 and 85°C and 100% RH for 24 h, followed by further curing at ordinary temperatures and humidities (21°C, 67% RH) for up to 28 days. The cured samples were tested for compressive strength and shrinkage. It has been found that the most important effect on the strength is due to the pre-curing temperature, while the post-curing time has much less effect. In general, the optimum pre-curing temperature is 70°C. Satisfactory strength results were obtained even with systems containing up to 80% waste materials.     

Synthesis of pure zeolite Y using soluble silicate, a two-level factorial experimental design

Four methods were used for the synthesis of pure zeolite Y using soluble silicate as a silica source: (1) the gelling of soluble silicate to silica–alumina gel, by aluminate (or aluminium sulphate), (2) the precipitation of soluble silicate to precipitated silica–alumina gel, by aluminate (or aluminium sulphate), (3) the gelling of soluble silicate by sulphuric acid plus alumina impregnation, and (4) the precipitation of soluble silicate by sulphuric acid plus alumina impregnation. A 2⁴ two-level factorial design was used to study the influence of four different variables on the purity of zeolite Y (expressed in terms of degree of crystallinity). The ageing time turned out to be the most significant variable. Synthesis time, alkalinity and mixing rate were also found to be statistically significant. X-ray diffraction patterns were used to characterize the samples, which ranged from well-crystallized faujasite structures to amorphous materials. The highest purity achieved in method (1) was 38%. The best synthesis condition derived from method (1) was applied to the other three methods. Only method (4) yielded the pure zeolite Y. Therefore, the effect of silica–alumina precursor preparation on producing the pure zeolite Y is extremely important.     

X-ray photoelectron spectroscopy of aluminium-substituted tobermorite

We have synthesised 11-Å tobermorite hydrothermally, both pure and with increasing isomorphic substitution of aluminium for silicon. The samples were analysed by X-ray photoelectron spectroscopy (XPS). Aluminium was found, on the basis of its Al 2p binding energies, to be tetrahedrally coordinated. We observed no changes in Ca/(Si+Al) ratio upon aluminium substitution, implying that charge balancing does not occur via the incorporation of additional calcium into the tobermorite structure. Aluminium substitution into the silicate structure led to a decrease in Si 2p binding energies. This implies one of two alternatives. Firstly, that charge balancing occurs via substitution of OH⁻ for O²⁻ in the tobermorite structure. Secondly, the presence of aluminium in the tobermorite structure may negatively influence the degree of silicate polymerisation. Further work is required to determine which of these possibilities is the case.     

Determination of Fatty Matter,Silicate and Chloride in Soap from a Single Aliquot

A simple, rapid method for analysis of soap samples has been developed. The special features of the method are 1) it enables determination of fatty matter, silicate and chloride in a soap from a single aliquot, 2) it eliminates the requirement of alcohol for determination of silicate (alcohol-insolubles), 3) it makes use of an indicator, bromocresol green that permits better detection of equivalance point, 4) it significantly cuts down the time of analysis to less than one and a half hour. Fatty matter, silicate and chloride can all be determined with reasonable accuracy. The relative standard deviation data for silicates at 10 to 20 per cent levels in soaps are in the range of 0.13 to 0.55 while those for fatty matter at 30 to 70 percent levels lie in the range of 0.14 to 0.47. The method is simple, unsophisticated, utilizes only inexpensive and readily available chemicals and are easily adoptable to any laboratory. The method is particularly useful for process control laboratories where speed is a prerequisite to analysis.     

无机缓蚀剂对铝合金缓蚀作用的研究

通过电化学极化曲线方法和电化学阻抗（ＥＩＳ） 研究了碳族元素含氧酸盐对铝合金在３ ．５ ％ （ 文中所叙述的３－５ ％ 的ＮａＣｌ 均指质量分数,以下不再另注）ＮａＣｌ 溶液中的缓蚀作用．实验结果表明,在氯化钠溶液中添加低浓度的碳酸钠和硅酸钠及高浓度的硅酸钠对铝合金具有较好的缓蚀作用,而添加低浓度的碳酸氢钠后缓蚀效率却很低,甚至没有缓蚀作用．碳酸钠和硅酸钠对铝合金的缓蚀作用是通过抑制铝合金的阴极反应和阳极反应,在铝合金的表面形成不溶的沉淀膜和ｐＨ 效应实现的．碳酸钠在一定程度上能够提高铝合金的抗点蚀的能力．     

陶瓷纤维填充聚烯烃复合材料的导热性能研究

制备了硅酸铝纤维、氧化铝纤维填充聚乙烯(PE)复合材料和硅酸铝纤维、氧化铝纤维填充聚丙烯(PP)复合材料；用稳态法考察了纤维用量对复合材料导热性能的影响。结果表明：硅酸铝纤维和氧化铝纤维填充PP、PE复合材料的热导率基本随纤维用量的增加而增加，在某些用量时稍有波动，纤维质量分数为35％的试样导热效果最好。