当前位置: 首页 > 论文中心
学科分类
/ 197
3921 个结果
湖南有色金属新材料产业发展研究
  • 简介:有色金属新材料在湖南新材料产业中占有重要地位,但有色金属新材料产业又是有色金属行业的薄弱环节之一.通过分析国外有色金属新材料产业的发展形势和湖南省有色金属材料产业存在的问题,提出了湖南省有色金属材料产业发展总体目标、战略发展思路、对策措施和政策建议.

  • 标签: 有色金属 新材料产业 现状与发展 研究
降低锌电解直流电耗生产实践
富氧在株冶铅烧结机及鼓风炉的设计选择及生产实践
  • 简介:介绍了株冶粗铅生产的现状、国外铅厂富氧熔炼的应用情况及变压吸附制氧方法,对株冶铅烧结机及鼓风炉富氧熔炼项目的设计选择及生产实践进行了论述.

  • 标签: 粗铅生产 变压吸附 富氧熔炼
株冶低浓度SO2制酸工艺的生产实践与技术改造
  • 简介:介绍了株冶低浓度SO2制酸的工艺流程、工艺特点、生产及技术改造情况,实践证明实现低浓度SO2制酸采用动力波净化WSA制酸是成功的,也指出了要实现长周期稳定运转还需解决的问题及对策.

  • 标签: 动力波 冷凝器 生产实践 技术改造
氯化除汞技术在锌冶炼烟气制酸中的应用
  • 简介:主要介绍了氯化除汞技术在锌冶炼烟气制酸中的应用情况以及生产工艺特点.

  • 标签: 除汞 氯化 烟气 制酸
辰溪锌硫矿可选性试验研究
  • 简介:针对某锌硫矿,从工艺矿物学研究着手,查明矿石性质,通过试验,确定与该矿浮选相适宜的工艺参数的两种选矿方案,取得较好的选矿指标.分别获得含锌品位为57.97%,回收率为98.10%及含锌品位为56.43%,回收率为90.07%的合格锌精矿.

  • 标签: 闪锌矿 浮选 锌精矿
选矿尾矿中绢云母的回收工艺及应用研究
铅锌混合精矿生产理论工艺指标计算方法探讨
  • 简介:主要介绍了铅锌混合精矿生产所遇到的理论工艺指标计算问题,列举了按现有一般方法计算铅锌混合精矿生产理论工艺指标不符实际的现象,提出了一种行之有效且比较符合实际情况的计算方法.

  • 标签: 铅锌混合精矿 理论工艺指标 计算
Study on PVC Grafted with Acrylic Rare Earths
  • 简介:ThecopolymerswereformedbythegraftcopolymerizationofPVCwithacrylicrareearth.TheprincipleandmethodofthegraftcopolymerizationofPVCandacrylicrareearthwerediscussed.ThegraftcopolymerswerecharacterizedbyFT-IRspectraandscanningelectronmicroscope(SEM).Thethermalstabilityofthegraft-copolymerswasstudiedbythermogravimetricanalysis(TG).Theexperimentresultsshowthatthethermalresistanceandtoughnessofthegraftcopolymersareobviouslyenhanced.

  • 标签: 接枝共聚 PVC 稀土 丙烯酸 FT-IR SEM
Structure and Electrorheological Performance of Nanosized Y2O3-Doped TiO2 Particle Materials
  • 简介:Thenanosizedparticlematerialsofdoped-TiO2withY2O3werepreparedbymeansofsol-geltechniqueforuseinelectrorheological(ER)fluids,andtheircrystalstructuresweremeasuredbyX-raydiffraction(XRD)analysis.TocomparewiththepureTiO2,adistinctenhancementintheshearstressunderdcelectricfieldwasfoundbyusingsuchmaterials.Thiscanbeexplainedbytheincreaseofthedielectriclossanddielectricconstantatlowfrequency.TheeffectsofthecrystalstructureoftheparticlesonthedielectricpropertyandERperformanceofmaterialswereinvestigated.

  • 标签: 二氧化钛 纳米材料 掺杂 稀土 XRD 结构
Changes of Structure and Magnetic Properties during Crystallization in Cast Nd60Fe20Al8Co10B2 Alloy
  • 简介:TheNd60Fe20Al8Co10B2alloywaspreparedbysuctioncastingofthemoltenalloyintoacoppermoldunderargonatmosphere.Themicro-structuralandmagneticpropertychangesintheNd60Fe20Al8Co10B2alloyduringcrystallizationwereinvestigatedbyX-raydiffraction(XRD),differentialscanningcalorimetry(DSC),scanningelectronmicroscope(SEM)andthevibratingsamplemagnetometer(VSM).TheprecipitationandNd-richandFe-richphaseshavenosignificanteffectontheintrinsiccoercitityforNd60Fe20Al8Co10B2alloyannealedbelow723K.However,thegrowthofFe-richphasedecreasesthesaturatemagnetizationandremanenceofthealloy.Thehardmagneticbehaviorisdisappearedwhenthealloyisfullycrystallized.

  • 标签: Nd60Fe20Al8Co10B2 铸造合金 结构 磁性能 XRD DSC
Preparation and Properties of La^3+ -Loaded Fluorion Adsorbent
  • 简介:TheLa3+-loadedadsorbentwaspreparedbythereactionbetweenLa3+andethanolamine-modifiedvegetabletannicextract,totreatF--containingwastewater.TheproblemsofheavycolorcausedbyvegetabletannicextractandofturbiditycausedbyreactionbetweenLa3+andF-weresolved.Whenotherconditionswerenotchanged,pH,temperature,stirringtime,anddosewerechangedrespectivelyandtheadsorbancewastestedrespectively.Theresultsshowthatthisadsorbentpossesseshighsaturatedadsorptivecapacity(18.86mg·g-1)whenpHis5~6,T≤80℃,0.2gdosage,and180minagitatingtime,andtheadsorbancereachesthehighest(98.5%).Theadsorbentcanbeeasilyregeneratedwith0.5mol·L-1NaOHatpH12.

  • 标签: 吸附剂 稀土 制备 废水处理 氟离子
Thermochemistry on Coordination Behavior of Neodymium Chloride Hydrate with Diethylammonium Diethyldithiocarbamate
  • 简介:Thecomplexofneodymiumchloridelowerhydratewithdiethylammoniumdiethyldithiocarbamate(D-DDC)wassynthesizedconvenientlyinabsolutealcoholanddryN2atmosphere.ThetitlecomplexwasidentifiedasEt2NH2[Nd(S2CNEt2)4]bychemicalandelementalanalysesandthebondingcharacteristicsofwhichwascharacterizedbyIR.TheenthalpiesofsolutionofneodymiumchloridehydrateandD-DDCinabsolutealcoholat298.15Kandtheenthalpieschangeofliquid-phasereactionofformationforEt2NH2[Nd(S2CNEt2)4]atdifferenttemperaturesweredeterminedbymicrocalorimetry.Onthebasisofexperimentalandcalculatedresults,threethermodynamicparameters(theactivationenthalpy,theactivationentropyandtheactivationfreeenergy),therateconstantandthreekineticparameters(theapparentactivationenergy,thepre-exponentialconstantandthereactionorder)ofliquid-phasereactionofformationwereobtained.Theenthalpychangeofthesolid-phasetitlereactionat298.15Kwascalculatedbyathermochemicalcycle.

  • 标签: 荧光材料 发光性能 稀土 热化学 配合物
Effect of Exogenous Rare Earths on Microbial Characteristics in Paddy Soil
  • 简介:Anincubationstudywasperformedtoelucidateexogenousrareearthelements(RE)influencingonmicrobialbiomass,microbialecophysiologicalparameterscmic/corg,metabolicquotientqCO2andrespiratoryrateinrelationtotemporalavailabilityinpaddysoil.Sixsampleswereaddeddifferentconcentrationsbetween0and2000mg*kg-1REEsinsoil.ResultsshowthatexogenousREhaveslightstimulativeeffectsonmicrobialindicesinpaddysoilatlowconcentrationintheearlystageafteraddingRE,whilehavinginhibitoryeffectsathighconcentration.TheinhibitionisstrengthenedwithincreasingREconcentrationandisweakenedwithincreasingincubationtime.PrincipalcomponentanalysisoftheBIOLOGdataindicatesthatmicrobialcommunitystructureshavechanged,carbonsourcesconsumptionofmicroorganismsinpaddysoilbecomesmuchmorerapidafter8weeks,andunderREstress,thechangeofmicrobialcommunitystructuresisalong-termeffect.

  • 标签: 呼吸速率 稻田 生物量 微生物 稀土 植物生理学
Distribution and Accumulation of Neodymium and Its Effect on Secretion of Progesterone in Mice
  • 简介:DistributionandaccumulationofNd,anditseffectonsecretionofprogesteroneinmicewerestudiedusingradioisotopetracer(147Nd)technique.Followingsingleintraperitonealadministrationofneodymiumtracedwith147Ndatadoseof200mg*kg-1,unevendistributionoftheradioactiveNdoccurredinvarioustissuesandorgans.Muchamountof147Ndaccumulatesinthebone,andtheresidueincreaseswiththelapseoftime.Someamountofradioactivitywasalsodetectedineyes,bloodandbrain,buttheaccumulationdecreasedwiththetimeduetoexcretionandre-distributioninmice.Incomparisonwithcontrols,concentrationofprogesteroneisfoundtobesignificantlylowerintheserumofadministeredmice,indicatingasignificantlyinhibitoryeffectofNdonsecretionofprogesterone.

  • 标签: 小鼠 分泌物 积聚 分布 黄体酮