一种新型絮凝剂的合成及应用

本文论述了聚丙烯酰胺类絮凝剂的国内外的生产状况，针对氧化铝生产工艺中赤泥快速分离确定了絮凝剂的几个主要参数，并在实验室和实际生产中进行了不同絮凝剂絮凝沉降的对比试验，证明该絮凝剂在氧化铝生产工艺中应用性能优良。     

水溶性高分子聚合物在拜尔法赤泥分离中的应用

文章论述了水溶性高分子聚合物的絮凝机理，从絮凝荆的类型选择、分子量分布、用量、添加方式等多方面分析了拜尔法生产氧化铝赤泥沉降分离时影响絮凝剂使用效果的影响因素。     

微生物絮凝剂在氧化铝生产中的应用探讨

本文论述了微生物絮凝剂的研究进展以及生物絮凝剂的絮凝机理，对氧化铝生产当前应用絮凝剂现状作了简要概述。比较微生物絮凝剂和有机、无机高分子絮凝剂的优越性，分析了微生物絮凝剂在氧化铝生产中的应用前景。     

用壳聚糖絮凝剂分离赤泥的比较研究

以虾蟹壳废料为原料制得的天然高分子絮凝剂壳聚糖 ,资源丰富 ,价格低廉。本文研究了壳聚糖对氧化铝烧结法赤泥的絮凝分离 ,比较研究了合成絮凝剂A -2 0 0 0和PAS-1与壳聚糖絮凝剂的絮凝能力 .实验结果表明 :壳聚糖对烧结法赤泥有一定的絮凝能力 ,在实验范围内壳聚糖的最佳添加量为 2 5× 1 0 - 4g (壳聚糖 ) g(干赤泥 ) ,前两分钟内的平均絮凝沉降速度达到 6 85cm·min- 1 .壳聚糖溶液放置 3 0h对絮凝影响不大     

赤泥的絮凝沉降

对用高碱性介质法得到的赤泥浆液进行絮凝沉降试验，结果表明，淀粉和A1000絮凝剂均可加速赤泥浆液的沉降速度，A1000的絮凝效果更好。当溶出时CaO的添加量为矿石质量的8％，浆料稀释至总Na2O质量浓度为350g/L，加入的A1000絮凝剂的质量为干赤泥质量的8％时，分离效果较好。赤泥浆料中碱学提高，赤泥沉降速度减小；CaO添加量增大、矿粉的粒度增大，赤泥沉降速度增大。pH小于14时，赤泥胶粒表面带负电；pH升高，赤泥颗粒迅速失去电荷。絮凝剂的加入有助于通过吸附架桥而加快赤泥沉降。     

拜耳法赤泥沉降分离系统絮凝剂的选型研究

介绍了拜耳法赤泥沉降分离试验采用多种合成絮凝剂试验室的研究情况 ,筛选出河南卫辉PAS - 1 # 为絮凝效果良好且经济方便的絮凝剂。通过 1 0天的工业试验 ,认为河南卫辉PAS - 1 # 絮凝剂可作为中铝山西分公司拜耳法赤泥沉降分离系统的添加剂使用     

高分子絮凝剂在拜耳法生产氧化铝赤泥沉降中的应用

结合理论和生产实际,总结某公司拜尔法氧化铝生产中赤泥沉降操作经验,详细阐述了高分子絮凝剂在拜耳法赤泥沉降过程中的配制与使用。     

拜耳法赤泥沉降分离影响因素探讨

在拜尔法生产氩氧化铝赤泥沉降分离过程中，赤泥分离效率的高低直接影响到产品产量和质量。文章针对矿石成分和品位、磨矿粒度、溶出液苛性比值、赤泥浆液固含、沉降槽温度、絮凝荆选型和用量沉降槽结构八个方面对沉降分离主要影响因素作探讨性分析。     

烧结法赤泥沉降中新型絮凝剂的开发与应用

在烧结法生产过程中赤泥的沉降分离是一个非常重要的环节,本文通过对絮凝剂在沉降过程中的反应机理的分析、研究,以及对PNA-1与现有絮凝剂(A—2000)的试验对照,选取适应烧结法生产的新型高效絮凝剂,以改善赤泥的沉降性能,从而达到提高设备生产效率和降低生产成本的目的。     

高浓度熟料溶出过程中絮凝剂的应用

熟料溶出是影响烧结法生产氧化铝产品质量和经济性的关键环节,本文结合近期所设计的烧结法生产氧化铝工程熟料溶出和赤泥分离洗涤工艺,对如何减少溶出后二次反应的发生,以及通过对溶出浆液絮凝性能的研究,以合理添加絮凝剂的方式来实现溶出浆液与赤泥快速分离作了初步探讨。     

论从实践理解世界的物质性和自然世界的先在性

马克思主义唯物论是一种物本主义形态的唯物论,还是一种超越物本主义形态、从实践理解世界的本质相关问题的实践的唯物主义的唯物论?这是一个我们必须搞清楚的有关马克思主义唯物论的本质规定性和精神实质的重大问题.在考察物本主义的唯物论及其思维方式的局限性的基础上,揭示了马克思主义唯物论是现代的、实践的唯物主义,并重点研讨了马克思主义唯物论关于从实践理解世界的物质性和自然世界的先在性的原理,以期为马克思主义唯物论进一步阐明人类世界的实践性原理奠定基础.     

Effect of cyproheptadine on the ultrastructure of the neurons of the arcuate nucleus in the hypothalamus of the rat

The data are presented on changes in the rat arcuate nuclear neuron ultrastructure after using cyproheptadine (peritol, Egyt Pharmaceutical Works, Hungary) in a water suspension at a dose of 20 mg/kg once daily during 7 successive days and twice a day within 10 days. It was shown that cyproheptadine decreases the functional activity of the arcuate nuclear neurons, depending on the total amount of the drug used. Cyproheptadine-induced inhibition of the forming neurohormone release from neurons is likely to be one of the mechanisms of its therapeutic effect in Itsenko-Cushing's disease.     

Characteristics of the sympathetic innervation of the nictitating membrane and of the vasculature of the nose and tongue of the cat

Vasomotor responses from the nasal mucosa and tongue, and contractions of the nictitating membrane, were recorded on stimulation of the cervical sympathetic or internal carotid nerves. Preganglionic sympathetic nerve fibres which elicited a membrane response possessed a lower threshold than those which evoked nasal vasoconstriction, while the latter displayed a lower threshold than fibres which evoked tongue vasoconstriction. The sympathetic vasodilator fibres to the tongue whose activity was revealed after alpha-receptor blockade, had a similar threshold to the vasoconstrictor fibres. Membrane contraction, nasal vasoconstriction and occasionally tongue vasoconstriction could be evoked by stimulating the internal carotid nerve. The postganglionic fibres innervating the nasal mucosa had a similar threshold to those of the nictitating membrane, which may indicate that there are small myelinated fibres innervating the mucosa. The preganglionic compound nerve action potential had four major components, S1-S4. S1, S2 and usually S3 fibres were associated with membrane contraction; S2, S3 and sometimes S1 fibres were associated with nasal vasoconstriction; and S3, usually S2 and occasionally S1 fibres were associated with vasoconstriction in the tongue. It is concluded that each of these three groups of nerve fibres, but not S4 fibres, may include fibres associated functionally with the three effectors. There was a considerable difference between the relative amplitude of the responses of the three effectors elicited by stimulation of the cervical sympathetic nerve at frequencies between 0.2 and 2 Hz. Vasoconstrictor responses were relatively larger than membrane contractions suggesting differences in the mechanisms of neurotransmission at the neuroeffector junctions.