Selective depression behavior of guar gum on talc-type scheelite flotation

The depression behavior and mechanism of guar gum on talc-type scheelite flotation were systematically investigated by flotation experiments, adsorption tests, zeta-potential measurements, and infrared spectroscopic analyses. The flotation results for monominerals, mixed minerals, and actual mineral samples indicated that guar gum exhibited much higher selective depression for talc than for scheelite. Bench-scale closed-circuit tests showed that a tungsten concentrate with a WO₃ grade of 51.43% and a WO₃ recovery of 76.18% was obtained. Adsorption tests, zeta-potential measurements, and infrared spectral analyses confirmed that guar gum absorbed more strongly onto the talc surface than onto the scheelite surface because of chemisorption between guar gum and talc. This chemisorption is responsible for the guar gum's highly selective depression for talc and small depression for scheelite. The flotation results provide technical support for talc-type scheelite flotation.     

改性瓜尔豆胶印花性能探讨

对改性瓜尔豆胶和海藻酸钠印花糊料的各项性能及其用于棉织物活性染料印花效果进行对比.实验表明,改性瓜尔豆胶的成糊率较高,其PVI值比海藻酸钠印花糊料PVI值低,粘度较大,更接近平网印花对糊料粘度的要求,且印花织物具有较好耐摩擦、耐水洗性能;改性瓜尔豆胶糊料其印花织物的K/S值与海藻酸钠糊料的印花织物相接近.因此,使用改性瓜尔豆胶可以部分替代海藻酸钠作为印花糊料,以降低生产成本.     

不同气体介质中脂松香的热氧化行为

在２５０℃和不同气体介质中对脂松香进行了加速氧化处理。用Ｃ＾＊ａ＾＊ｂ＾＊色度系列测定了松香色度随时间的变化，并用Ｘ－射线光电子能谱仪分析了氧化松香中含碳基团的种类和数量。通过解析色度变化与各种基团的关系，发现松香中双键与氧形成环氧基再水解成羟基是松香氧化的主要途径之一；羰基的形成是松香变红的主要原因。氨气或冷凝回流的松香挥发分的气化能有效地抑制氧化反应。     

新型保护胶BJ和去胶剂QJ的研制

为了替代引进生产线配套使用的保护胶和去胶剂，参照国内现有的工艺条件，研制了新型保护胶ＢＪ和去胶剂ＱＪ     

紫外分光光度法测定200～260℃加氢精制无味煤油中芳烃含量

用一待测200～260℃加氢精制无味煤油试样,利用硅胶吸附、甲醇顶替脱附的办法制取其中的混合芳烃.以异辛烷作为稀释溶剂,求出该混合芳烃在272 nm处的平均吸光系数,然后利用此吸光系数测定与其属同一批原料所生产的其它无味煤油中芳烃含量.在波长272 nm处,本方法的检测下线可达0.57 ug/g,灵敏度指数0.45μg.cm-2,回收率为94%～101%.     

模型血泵相似性设计及验证

以日本磁悬浮离心式血泵为原型,设计制作了放大2倍的模型泵,用不同流体对泵的相似性进行实验验证发现,模型泵和原型泵具有很好的相似性;采用黄原胶溶液模拟血液流体比水的相似性更好,质量分数为0.06%和0.04%的溶液比其他浓度溶液更接近血液流体.在溶液浓度较低时,溶液的非牛顿特性对离心泵的相似设计影响较小,模型泵实测相似临界雷诺数和转速分别与相似设计的临界雷诺数和转速一致;在溶液浓度较高时,溶液的非牛顿特性对离心泵的相似设计影响较大,模型泵实测相似临界雷诺数和转速远小于相似设计的临界雷诺数和转速.     

Synergistic interaction and gelation in cationic guar gum-sodium alginate system

The synergistic interaction between the cationic guar gum (the ammonium hydroxy-propyl-trimethyl chloride of guar gum) and sodium algirmte has been studied. The effects of the mass ratio of them, mixed temperature, balk salt ion concentration, incubation time and pH value on gelation were investigated. It has been observed that there was a gel strength maximum when the mass ratio was 0. 6, the mixed temperature was 70 ~C, the balk salt ion concentration was 1.0 mol ~ L-1 , the incubation time was 30 rain and the pH value was 8. Interaction between molecules of these two polysaccharides was investigated by FT-IR spectrometry.     

无粘土冲洗液的降泵压性能研究

本文讨论了田菁减阻液的试验研究结果,即雷诺数、浓度、管径、机械降解及阳离子等因素对田菁减阻性能的影响。还探讨了紊流减阻的机理及介绍了田菁减阻液在岩心钻探中的初步应用效果.     

糖精生产废水的混凝-生化处理方法研究

运用化学混凝法和生化处理糖精废水，考察了无机高分子混凝剂聚合硫酸铁（PFS）的用量、pH值和羟乙基田菁胶等对混凝处理糖精废水的影响，并探讨了其作用机理。结果表明，在pH=3.7左右，PFS用量为930mg/L，羟乙基田菁胶为10mg/L，处理效果较好。用CaO MgO为中和剂和助凝剂可以加快沉降速度，缩小沉降比，并能有效控制体系的pH值和降低Cu^2＋浓度。经混凝－中和处理后的糖精废水，CODCr去除率达91.5%，脱色率达73.0%，Cu^2 去除率达100%，再经过生化处理可实现达标排放。     

高压电机真空压力浸漆新工艺

在复合绝缘工艺的基础上,对高压电机定子线圈的制造工艺进行了改进,提出了一种新的电机定子线圈的制造工艺——真空压力浸漆工艺,该方法具有占用空间少、环境好、材料工时浪费少、效率高、质量可靠等优点．