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自发分散
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  spontaneous dispersion
     A Study on Spontaneous Dispersion Rate of V_2O_5 on the Surface of γ-Al_2O_3
     V_2O_5在γ-Al_2O_3表面上自发分散动力学研究
短句来源
     For the VO_x/Al_2O_3 catalyst prepared by mechanical grinding,although there was an interaction between V_2O_5 and Al_2O_3,no obvious spontaneous dispersion phenomenon was observed;
     机械研磨法制备的VOx/Al2O3催化剂在升温过程中虽然VOx与Al2O3之间存在相互作用,但并没有观察到明显的自发分散现象,V2O5一直以晶体氧化物形式存在.
短句来源
     The effect of spontaneous dispersion may be characterized with principles of the spontaneous monolayer distribution.
     自发分散效应可以称为自发单层分散原理。
短句来源
     The effect of spontaneous dispersion may be characterized with principles of the spontaneous monolayer distribution,the principles of the spontaneous monolayer distribution may be used to improving and understanding the preparative procedures for heterogeneous catalysts or to solving relevant problems of the surface structure.
     自发分散效应可以称为自发单层分散原理,这一自发单层分散原理可用于解释和改进多相催化剂制备工艺条件、解决相关的表面结构问题.
短句来源
     Spontaneous dispersion of oxides and salts to zeolites as a principle and method for modification of zeolites might have extensive applications.
     氧化物和盐类在分子筛上自发分散是分子筛改性的一个重要原理和方法,有广泛的用途。
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  “自发分散”译为未确定词的双语例句
     It has been shown by in situ XRD that V_2O_5 can disperse spontaneously ontothe surface of silica gel,but the dispersion temperature is relatively high.
     用原位XRD方法证明V_2O_5能在硅胶表面自发分散,但所需温度较高.
短句来源
     The results showed that La_2O_3 could disperse spontaneously on Y zeolite and the limiting value was high.
     结果表明 :La2 O3 在Y型沸石上自发分散 ,且分散阈值较高 ;
短句来源
     Simultaneously,a part of(NH4)2SO4 decomposes,and the sulfate ion interacts with the surface of Fe2O3 to form a surface sulfato complex of Fe involved in the sites responsible for the acidic and catalytic properties of sulfate promoted iron oxide.
     研究结果表明,热处理时存在着(NH4)2SO4在Fe2O3表面上自发分散过程。 同时在表面形成S-Fe配合物。
短句来源
     The dispersion has been verified by XRD,XPS,EXAFS etc.
     这种自发分散现象已为XRD,XPS和EXAFS等多种谱学实验所证实。
短句来源
     The structure of CuO/ZrO 2 catalysts and their reduced states has been characterized by means of XRD, EXAFS and ESR. It is found that CuO is the only compound containing copper in CuO/ZrO 2 and the ZrO 2 support has influence on the structure of CuO. CuO in CuO/ZrO 2 can disperse spontaneously at a proper calcination temperature.
     以XRD,EXAFS和ESR等手段考察了CuO/ZrO2催化剂及其还原态的结构.结果表明,在CuO/ZrO2中铜以CuO的形式存在,ZrO2载体对所负载的CuO的结构有影响.CuO的分散度与焙烧温度有关,在适当的温度下焙烧,负载于ZrO2上的CuO可自发分散.在还原态试样中铜主要以金属铜的形式存在;
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  相似匹配句对
     Dispersion of Urea in Natural Clinoptilolite
     尿素在斜发沸石上的自发单层分散
短句来源
     Dispersion of Particles
     颗粒分散
短句来源
     Spontaneous Monolayer Dispersion of Some Organic Compounds on Oxide-supports
     某些有机物在氧化物载体表面的自发单层分散
短句来源
     Dispersion of Clay
     粘土的分散
短句来源
     Spontaneous remission of epilepsy
     癫痫的自发缓解
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  spontaneous dispersion
Spontaneous dispersion of the composite in water at various component ratios makes it possible to prepare a sol or gel of hydrated aluminum oxide.
      
From spontaneous dispersion to mechanical alloying
      
Phenomena of spontaneous dispersion, mechanical alloying, and plastic deformation of metals and ionic crystals in the air and in the presence of surfactants within a wide range of thermodynamic and mechanical forces are compared.
      
A model of spontaneous dispersion of crystalline tetracene in water under heating was suggested.
      


This paper presents a general introduction to the main developments of mineral processing science and technology in China in 1986,including theoretical research, pretreatment of crude ore,processes,equipment,reagents,wear-resistant materials, mathematical model and computer application,comprehensive utilization of natural resources and enviormental protection. By the instrumental analysis of PES,without the collector molecules in the pulp, the elemental sulphur was monitored on the surface of galena.In this...

This paper presents a general introduction to the main developments of mineral processing science and technology in China in 1986,including theoretical research, pretreatment of crude ore,processes,equipment,reagents,wear-resistant materials, mathematical model and computer application,comprehensive utilization of natural resources and enviormental protection. By the instrumental analysis of PES,without the collector molecules in the pulp, the elemental sulphur was monitored on the surface of galena.In this case,it is pro- ved that the mechanism of galena flotation in the collector molecule free pulp is due to the formation of elemental sulphur hydrophobic film on the mineral surface,The study of seperation between cupric ion activated pyrite and chalcocite shows that it can be effectively achieved by using chelating reagent.When tartaric acid is used,the adsorption of tartaric radicals on the surface of activated pyrite makes its hydrophi- bility increase and molecule adsorption bf collector decrease.However,it rarely ma- kes difference to chalcocite.In the pulp of nickel sulfide ore from Jinchuan Mine, the large amount of Mg(Ⅱ)is present.In the medium of alkaline,the flotability of pentlandite which is the main valuable mineral in the deposit is markedly depressed. By means of PES,AES and ESR,the investigation was made.The mechanism of Mg(Ⅱ)affection is proved to be the result of surface compound film of magnesium hydroxide being formed.The reagent of sodium meta-phosphate serves as a chelating agent and is able to dissolve the magnesium hydroxide on mineral surface so that the flotability of pentlandite can be greatly improved.The pre-adsorption of cupric ion is able to prevent the hydroxidization of pentlandite surface.In the process of shear flocculation-flotation for ultrafine wolframite,the main aim of high speed stirring is to overcome the repulsive energy barriar between ultraflne wolframite particles and facilitate the formation of flocs.As the result,the particle size of wolframite for flotation can be increased from 4.1μm to 8.5μm and rate of shear flocculation flotation is 4.1 times as quick as that of conventional flotation. Finely ground hematite can be aggregated in the presence of ultrafine magnetite which has natural magnetism.This hypothesis gives a better interpretation of selective flocculation-desliming process for the raw material of which is finely ground in Bao Tao iron oxide mine. The new point of view about rate equation of flotation model has been given in the study of flotation kinetecs.The one-to one correspondence between the integrated form of rate equation for a batch process and the distribution of rate constents at initial time is proved.The relationship between the average rate constant of flotation material presented in the cell and time t is reduced from the distribution of rate cons- tants.It is that the instantaneous decreasion rate of K(t)is directy proportional to he variance of the distribution of rate constants at any moment t. In the development of new processes and equipment,for the efficiency enhancement of raw material pretreatment,the vibrating feeding-screeningwashing process is intro- duced in Yichun tantalite-columbite mine.Screening and desliming of crude ore in co- nveying process are carried out and clogging problem in crushing circuit is avoided. Sequential branch flotation processes has been applied in practice.The reagent co- nsumption is 29.2% lower and copper grade of concentrate is 2.41% higher in Dexin Copper Mine when this technology is used.In the flotation practice of lead-zinc co- mplex ore,multi stage fine grinding and benzal-dithiophosphate are applied.The reco- very of lead and silver is up to 30% when flowsheet of selective flotation for lead, bulk flotation for zinc-sulphur and zinc-sulphur seperation is assigned.The extractive metallurgy of gold has achieved important advance.Two processing plant using car- bon-pulp method were set up,leaching recovery of gold reached to 95-98%.Pile leac- hing technology was adopted to treat ores with low gold content and metal recovery is about 70% with 0.6Kg/T of sodium cynide consumption. New types of gravity seperatiou equipment have been developed including 24m~2jig,LX-200mm double drum centrifugal concentrator and belt-vibrating sluice. Flotation machine,reagent feeder,magnetic separator and filter of latest version have been offered and apprciation from user obtained. Industry practice shows that sodium hydroxamite mixing with butylxanthate can be used to considerablly improve the technical performance in the flotation of copper oxide ore with lower expense.Research work shows that the nonionic polar collector containing bivelent sulphur like isopropylthiocarbamate(Z-200)and diethylthiocarba- mate(E-105)can be employed to extract iron oxide from copper oxide ore by means of flotation and the technical performance is obviously better than that of xanthate. Good result have been got in the flotation of galamine using organic ammonium salt as collector.In the flotation of scheelite from calcium bearing gangue mineral,a kind of collector with two radicals of opposite charge has been proved to have good sele- ctivity.SG series of sesbania and its derivatives are the new types of flocculant.They have characteristics of excellent solubility in a wide range temperature,lower energy consumption,no poisoning,no secondary contamination and high effectiveness with small amount adding and so on.High energy radiation of gamma-ray can be used to increase the efficiency of some types of collector.When water solution Aerosol-22 is exposed to the radiation of Co-60,the concentration of sulfonate will increase and the improvement of collecting ability can make the cassiterite recovery 20-30% higher. Rubber liner wear-resistant material is now widely applied in mineral processing plant.Polyurethane synthesis material has shown great advantage.The attention has been paid to materials and shape of grinding media and its technique of manufactu- ring.The hardness and some other mechanical properties can be improved when pro- per material and pretreatment of heating are assigned and therefore the consumption of media will be eonsiderablly lowered. The computer application in mineral processing field of reseach,design,techno- logy development in industry and enterprise manegment is more pubic.The explicit programm must be orgnized and the strategy must be made to strengthen the research about computer technology and develop more systematically. The advance of slag and residue treatment and utilization has be gained.Gold and iron concentrate are recovered from slag of pyrite roasting process.The further recovery can be realized by processing dross from smelting furnace.

本文介绍了1986年中国选矿科技的主要进展,包括选矿理论研究、选前作业、选矿工艺、选矿设备、选矿药剂、耐磨材料、选矿数模及计算机应用、综合利用及环境保护等方面的进展情况。采用光电子能谱在无捕收剂浮选方铅精矿的矿物表面检测到了元素硫的存在,证实了方铅矿无捕收剂浮选的机理是在方铅矿表面氧化生成疏水性的元素硫。被铜离子活化的黄铁矿与辉铜矿浮选分离的研究表明,采用有机络合剂可以实现二者的有效分离。当采用酒石酸时,酒石酸在已活化的黄铁矿表面选择性吸附增加其亲水性,同时还生成比乙基黄酸亚铜更稳定的表面络合物,减少乙基黄药的吸附量,而这两种表面效应在辉铜矿表面均不明显。金川镍矿浮选矿浆中,存在大量的 Mg~(2+),矿浆呈碱性时,Mg~(2+)对镍黄铁矿浮选有抑制作用。电子能谱和顺磁共振技术研究表明,镍黄铁矿表面羟化镁晶态膜的形成是 Mg~(2+)抑制作用的本质。六偏磷酸钠可以溶解镍黄铁矿表面的羟化镁膜,硫酸铜预先与镍黄铁矿作用,使其表面失去对 OH-的吸附活性。黑钨矿的剪切絮凝浮选,强烈搅拌的主要作用是克服粒子间存在的斥力能峰,添加长烃链捕收剂,可显著提高粒子间的引力作用能,导致黑钨矿粒子间产生絮团,使粒度分布 d_(8...

本文介绍了1986年中国选矿科技的主要进展,包括选矿理论研究、选前作业、选矿工艺、选矿设备、选矿药剂、耐磨材料、选矿数模及计算机应用、综合利用及环境保护等方面的进展情况。采用光电子能谱在无捕收剂浮选方铅精矿的矿物表面检测到了元素硫的存在,证实了方铅矿无捕收剂浮选的机理是在方铅矿表面氧化生成疏水性的元素硫。被铜离子活化的黄铁矿与辉铜矿浮选分离的研究表明,采用有机络合剂可以实现二者的有效分离。当采用酒石酸时,酒石酸在已活化的黄铁矿表面选择性吸附增加其亲水性,同时还生成比乙基黄酸亚铜更稳定的表面络合物,减少乙基黄药的吸附量,而这两种表面效应在辉铜矿表面均不明显。金川镍矿浮选矿浆中,存在大量的 Mg~(2+),矿浆呈碱性时,Mg~(2+)对镍黄铁矿浮选有抑制作用。电子能谱和顺磁共振技术研究表明,镍黄铁矿表面羟化镁晶态膜的形成是 Mg~(2+)抑制作用的本质。六偏磷酸钠可以溶解镍黄铁矿表面的羟化镁膜,硫酸铜预先与镍黄铁矿作用,使其表面失去对 OH-的吸附活性。黑钨矿的剪切絮凝浮选,强烈搅拌的主要作用是克服粒子间存在的斥力能峰,添加长烃链捕收剂,可显著提高粒子间的引力作用能,导致黑钨矿粒子间产生絮团,使粒度分布 d_(80)由4.1微米增加到8.5微米,并使浮选速度增加4.1倍。微细粒磁铁矿具有天然磁性,其周围细粒赤铁矿在磁力的作用下产生磁团聚。应用这一理论,较好的解释了包头氧化矿细磨后实现选择性团聚脱泥的工艺现象。提出了矿物浮选速度模型新见解,认为速率方程的积分形式与槽内欲浮物料的速率常数初始分布是——对应的。由 K 值分布概念导出平均 K 值随时间变化的规律、即平均 K 值的下降速率与K 值分布的方差成正比研制新设备、采用新工艺提高选前作业效率,介绍了宜春钽铌矿采用振动给矿筛洗工艺,使矿石在输送过程中实现筛分和脱泥,解决了碎矿堵塞难题。分支串流浮选工艺在生产中得到应用。德兴铜选厂采用该工艺,药耗降低29.2%,铜精矿品位提高2.41%。复杂多金属铅锌硫化矿石采用阶段细磨,苯胺黑药优先选铅,锌硫混选而后分离新工艺,使铅、银回收率提高30%以上。黄金选冶工艺获重大进展,建成两个全泥炭浆法提金厂,金浸出率可达95~98%。低品位含金矿石采用堆浸法提金工艺,浸出率为70%左右,氰化钠耗量为0.6公斤/吨。介绍了重选新设备,包括24米~2大型跳汰机、LX-2000毫米双转鼓离心选矿机和振动皮带溜槽。浮选机、加药机、磁选机、过滤机均有新产品推出,受到用户欢迎。生产实践表明,异羟肟酸钠与丁黄药混用浮选氧化铜矿石,精矿品位及回收率均显著提高,且药费降低。研究结果表明,Z-200和酯105这两种含硫非离子型极性捕收剂从氧化铁矿石中浮选氧化铜,其指标明显优于黄药。以胺盐作为捕收剂浮选异极矿,获得了好的结果。一种以两性化合物为基础的混合药剂,从含钙脉石矿物中浮选白钨矿,显示出良好的选择性。SG 型田菁胶及其衍生物是一种新型絮凝剂,该类药剂具有溶解水温范围宽、节能、无毒、不会造成二次污染、用量少等优点。某些药剂经γ射线辐照,可以提高捕收性能。以钴60辐照 Aerosol-22的水溶液,可使溶液中的磺酸盐含量增加,能使锡石回收率提高20~30%。衬胶耐磨材料正在选厂推广,聚氨酯合成材料在试用中显示出更大的优越性。磨矿介质的材质,加工工艺及介质形状均已引起注意,选用适宜的材料,恰当的进行热处理,可提高钢球的硬计算机在选矿科研、设计、生产技术和生产管理等领域的应用日益普及。目前,急需在自发、分散、单项研究的基础上进行统筹规划,明确奋斗目标,制定发展策略,有计划的安排力量,进行系统的研究和开发。废渣的治理和利用取得了进展,从黄铁矿烧渣中回收了黄金和铁精矿。从高炉渣中,可进一步回收铁。

The project of basic research for structure chemistry started in 1986. Peking University is in charge of this project. Professor Tang Youchi is the director. Fudan University, Jiling University, Nanjing University, Institute of Chemistry, Institute of Chemical Metallurgy, Fujian Institute of Matter Structure join this project.

“结构化学基础研究”是国家自然科学基金会1986年重大项目,现已取得很大进展。在生物大分子结构的研究方面已测定了系列Bowman-Birk型抑制剂与胰蛋白酶复合物的晶体结构,在国际上第一个阐明了Bowman-Birk型抑制的立体结构特征。结合过去提出的“氧化物和盐类在载体表面有自发分散倾向”的规律,深入研究了单层分散相的微观结构和生成机理,并根据这些机理制成某些有用的吸附剂推广到工业上应用。建立了研究气相、液相瞬态自由基结构和性质的方法及自由基捕捉技术。开展了多种活泼中间体的结构性能研究。建立了各种结构数据库及分子设计程序包。开展了多种药物的构效关系研究及分子设计。在蛋白质结构预测及分子设计方面也做出了一批成果。

The surfaces of ammonium nitrate treated with different surfactants were studied using XRD, SEM and XPS. It was found that below its m. p. the solid surfactants spontaneously disperse on the surfaces of ammonium nitrate and form a stable monomolecular or submonomolecular layer (with surfactants adsorbed on the surfaces of the nitrate). The reason will be given for the strong absorption of the surfactants on the surfaces.

本文介绍了利用X衍射仪、扫描电镜和X光电子能谱仪研究不同表面活性剂处理的硝酸铵表面的研究结果,讨论了固态表面活性荆在其熔点以下,自发地分散在硝酸铵表面,形成稳定的单分子层或亚单分子层(即固态表面活性剂吸附在硝酸铵表面),并分析了阳离子型表面活性剂能较牢地吸附在硝酸铵表面的原因。

 
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