Depressing effect of hydroxamic polyacrylamide on pyrite

The performance of hydroxamic polyacrylamide(HPAM) in mineral flotation was tested on the samples of calcite, diaspore and pyrite. It is found that HPAM expresses intensive depression on pyrite and can be used as effective depressants for pyrite. The depression mechanism of HPAM to pyrite was investigated by the determination of contact angle, zeta potential, adsorptive capacity for collectors and infrared spectrum. A lower contact angle,more negative zeta potential, less xanthate adsorptive capacity, and the formation of chemical bonding were determined, which reveals that the strong chemical interactions exist between HPAM and pyrite surface. The group electronegativity of HPAM was calculated to explain the differences of interaction between reagent and minerals.     

增塑剂DIOA合成中的催化体系

介绍了己二致二异辛酯(DIOA)合成中的催化荆体系,并对其发展前景进行了展望.     

白炭黑的表面改性及应用

白炭黑是水合SiO2，属于纳米材料。白炭黑能大幅度提高胶料的物理机械性能，减少胶料滞后、降低轮胎的滚动阻力，受到广泛的关注。白炭黑具有特殊的表面结构（带有表面羟基和吸附水）、特殊的颗粒形态（粒子小，比表面积大等）和独特的物理化学性能，广泛应用于橡胶、塑料、涂料、医药、日用化工诸多领域。本文介绍了国内外白炭黑的表面改性研究趋势，指出白炭黑是一种有发展前景的产品。     

Density functional calculation of equilibrium geometry and electronic structure of pyrite

1　ＩＮＴＲＯＤＵＣＴＩＯＮＰｙｒｉｔｅ (ＦｅＳ2 )ｉｓａｔｙｐｉｃａｌ 3ｄｔｒａｎｓｉｔｉｏｎｍｅｔａｌｍａｔｅｒｉａｌ.Ａｃｏｍｐｒｅｈｅｎｓｉｖｅｓｔｕｄｙｏｆｅｌｅｃｔｒｏｎｉｃｓｔｒｕｃ ｔｕｒｅｏｆＦｅＳ2 ｉｓｈｅｌｐｆｕｌｔｏｕｎｄｅｒｓｔａｎｄｉｎｇｔｈｅｓｅｒｉｅｓｏｆｅｌｅｃｔｒｏｎｉｃｓｔｒｕｃｔｕｒｅｏｆｔｒａｎｓｉｔｉｏｎｍｅｔａｌｄｉｓｕｌｆｉｄｅＭＳ2(Ｍ =Ｆｅ ,Ｃｏ ,Ｎｉ ,Ｃｕ ,Ｚｎ)ｗｉｔｈｔｈｅｐｙｒｉｔｅｓｔｒｕｃｔｕｒｅｂｅｃａｕｓｅｏｆｔｈｅｉｒｗｉｄｅｒａｎ…     

红烧肉的真空冷冻干燥试验

通过正交试验得出不同指标下真空冷冻干燥红烧肉过程中加热板温度、物料厚度、升华压力和解析压力的最佳参数值,并得出四种因素对指标影响的次序。经复水试验得到复水量在原含水量的140%～150%,复水温度在65℃～85℃,复水时间在20min-30min之间为最优。     

猪肉香料香精的酶解法制备

主要研究了以猪肉为主要原料,采用酶解技术与美拉德反应相结合制备天然肉味香料香精的新工艺,实验结果表明:(1)在美拉德反应前先对鲜肉进行酶解,可以克服反应时间过长的缺点;(2)经过酶解的产品,风味增强,对人体感官能够形成较强的刺激;(3)美拉德反应中温度控制在100～104℃时,反应产物的香气特征更逼真.     

泰国复杂高岭土矿除铁的试验研究

对泰国复杂高岭土矿样的物相分析表明影响其白度的主要杂质为含铁矿物。试验证明,常规处理方法不能达到除杂目,而化学漂白与螯合剂强化漂白的联合处理方法可以除去大部分含铁杂质,得到白度高、铁含量低的高岭土精矿。     

Depressing effect of phenoxyl acetic acids on flotation of minerals containing Ca^2＋/Mg^2＋ gangues

Phenoxyl acetic acids were applied to determine their depressing effect on minerals containing Ca2 /Mg2 gangues. Calcite, mixture of calcite and fluorite, and nickel ore were used in the flotation. And the depression mechanism was studied by the determination of contact angle, zeta potential, adsorptive capacity of collector, and IR analysis as well. It is found that 0.1 mmol/L of phenoxyl acetic acid derived from pyrogallol or gallic acid exhibits strong depressing ability on calcite in almost zero yields at pH value of 9.8, and calcite can be depressed in the flotation of calcite/fluorite mixture for approximate 87% yield of fluorite. The flotation result of practical nickel ore containing serpentine indicates that these two depressants may also show better depression performance to serpentine than traditional depressants such as sodium fluosilicate and carboxylmethyl cellulose. Analysis for the depression mechanism reveals that there exists strong chemical interaction between the depressants and minerals.     

基于荧光寿命的光纤温度传感器

基于荧光寿命建立的光纤温度传感器不仅优于其他的.光纤传感器,而且具有防电磁干扰、绝缘、测量精度高等优点,它的可测量温度范围在0～200℃.……     

人工景观水体健康状况的综合评价方法

针对人工景观水体的特点,建立了水体健康状况的综合评价指标体系和模糊层次评价模型,并对整治前的同济大学三好坞人工景观水体进行健康诊断。结果表明,三好坞水体处于亚健康状态,水质保障是整治重点。研究成果可为2010年上海世博会园区景观水体建设与管理提供科学决策的依据,也可为其他景观水体的维护和修复提供参考。