新技术、新设备在三山岛金矿新立选矿厂的研究与应用

三山岛金矿新立8 000 t/d选矿厂采用HP500圆锥破碎机、高压辊磨机以及大型球磨机MQY5.5×8.5 m和KYF-1600大型浮选机等新型选矿设备,为矿山的稳定生产提供了有力的保障,选矿自动化控制的应用更是达到了生产过程集中操作的目的。三山岛金矿新立选矿厂致力打造现代化、智能化的一流选矿工程。     

高压辊磨机降低选厂能耗研究

采用高压辊磨机破磨云南白牛厂铜矿样品效果十分显著,大大降低了产品粒度,优化了粒度组成。提高了球磨机产能和降低电能消耗,选矿综合能耗降低20%以上,球磨机处理能力可以提高30%。     

提高选矿厂磨矿系统效能的技术改造及应用研究

选矿厂磨机运行的优劣程度对于整个选矿厂生产经营工作的重要性不言而喻,因此,如何采用简便、高效且实际可操作的方法来提高磨矿效能一直是广大选矿工作者研究的重点。目前,选矿厂衡量磨矿效能的参数主要有磨机利用系数、单位磨矿能耗和磨矿成本等。某选厂对球磨机运行状态进行了大量的检测及研究,通过优化磨机内部结构、调整内部钢球级配来适应磨矿负荷的变化,确保达到球磨机内部参数的最优状态,从而实现以较少的投入提高磨矿效能的目标。     

MQY4585中心传动球磨机的设计

球磨机历来是选矿厂最重要的设备之一,在选矿过程中它发挥着不可替代的作用,在选矿工艺中粗碎过的矿石再细碎的过程中,只能使用球磨机或棒磨机,其能耗占整个选矿厂的30%～60%,而且它的产能状态直接影响着整个选厂的生产能力。随着现代科学日新月异的发展,磨机也趋向于大型化、节能化发展。有些新建的选矿厂在选矿流程设计时,为了节约使用成本,采用了新型的球磨机-中心传动球磨机。本文将对现场实际情况分析,设计MQY4585中心传动球磨机。     

江西某铁矿选矿系统增产降耗的可行性研究

针对江西某铁矿选矿厂球磨系统入磨粒度粗,入磨金属含量低、选矿比高的特点,引进高压辊磨设备,采取干式磁选-高压辊磨-粗粒湿选优化方案,对碎矿产品进行超细碎,矿石抛废、磨前粗粒湿式抛尾,大幅度提高球磨机的处理能力,最终达到提高选厂生产能力、降低选矿成本的目的。     

高压辊磨机在选矿厂的应用与探讨

讲述了高压辊磨机的作用机理,对高压辊磨机在选矿厂不同破碎工段的应用情况做了介绍,提出了使用高压辊磨机的几点建议。     

高压辊磨机在选矿厂的应用与探讨

讲述了高压辊磨机的作用机理,对高压辊磨机在选矿厂不同破碎工段的应用情况做了介绍,提出了使用高压辊磨机的几点建议.     

梅山铁矿石高压辊磨试验研究与应用探讨

采用德国洪堡公司的RP80/25型高压辊磨机对梅山选矿厂细碎产品进行了半工业试验,研究了能耗、水分、通过量及循环负荷等因素对辊压效果的影响.闭路试验结果表明,梅山铁矿石适合采用高压辊磨机粉磨,而且作业能耗降低25%～30%,有利于工序的节能降耗,同时有利于提高生产效率和改善磨矿效果.依据上述试验结果,提出了梅山应用高压辊磨机的技术方案,同时指出了工艺配置中亟待解决的一些技术问题.     

黄金矿山大型球磨机综合节能研究及应用

球磨机是岩金矿山选矿厂的重要设备,同时也是能耗大户。以三山岛金矿8 000 t/d新立选矿厂MQY5.5 m×8.5 m大型球磨机为工程实例,简要介绍了球磨机磨矿效能的影响因数,着重分析研究了大型球磨机磨矿效能影响因素优化节能、大型球磨机设计及参数优化节能、磨矿自动化及磨矿系统最大临界负荷节能。综合节能研究及生产应用取得了磨矿能耗降低17.24%的显著效果。     

沂南金矿选矿工艺的改进

随着选矿工艺的不断进步和选矿设备的不断优化,用高效率的选矿设备代替陈旧高能耗的设备成为趋势。沂南金矿用水力旋流器代替分级机与格子型球磨机组成闭路磨矿系统的实践经验和思路,为新选厂的设计创造了条件。山东黄金集团沂南金矿始建于1957年,分级机与格子型磨机联合应用组成闭路磨矿已在本矿使用半个世纪有余,矿区属大型金铜铁多金属矿,其中金的嵌布粒度较细。沂南金矿现有三个选矿厂,对     

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.