JB/T 4246-1999 旋转概率筛
时间:2024-05-13 17:10:43 来源: 标准资料网 作者：标准资料网 阅读：8184
基本信息
| 标准名称： | 旋转概率筛 |
| 英文名称： | Rotating probability screens |
| 中标分类： |
矿业 >>
矿山机械设备 >>
筛分设备 |
| ICS分类： |
采矿和矿产品 >>
矿产加工设备
|
| 替代情况： | JB 4246-1986;被JB/T 4246-2012代替 |
| 发布部门： | 全国矿山机械标准化技术委员会 |
| 发布日期： | 1999-06-28 |
| 实施日期： | 2000-01-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2012-11-01 |
| 归口单位： | 全国矿山机械标准化技术委员会 |
| 出版日期： | 1900-01-01 |
| 页数： | 7 页 |
| 批文号： | 国机管[1999]362号 |
适用范围
JB/T 4246-1999 本标准是对 JB 4246-86《旋转概率筛》的修订，修订时仅按有关规定作了编辑，技术内容没有改变。 本标准规定了旋转概率筛的产品分类，技术要求，试验方法，检验规则，标志、标签、使用说明书，包装、运输和贮存。 本标准适用于旋转概率筛。该筛主要用于高水分、中细粒级原煤的分级。
前言
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引用标准
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所属分类： 矿业 矿山机械设备 筛分设备 采矿和矿产品 矿产加工设备
【英文标准名称】:StandardPracticeforConditioningContainers,Packages,orPackagingComponentsforTesting
【原文标准名称】:试验用调节容器、包装件或包装元件的标准实施规程
【标准号】:ASTMD4332-1999
【标准状态】:作废
【国别】:美国
【发布日期】:1999
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:容器;状态调节;条件;环境;包装件;材料
【英文主题词】:conditioning;materials;conditions;packages;environment;containers
【摘要】:
【中国标准分类号】:A80
【国际标准分类号】:
【页数】:
【正文语种】:英语
【英文标准名称】:Workplaceairquality-Determinationoftotalorganicisocyanategroupsinairusing1-(2-methoxyphenyl)piperazineandliquidchromatography
【原文标准名称】:工作场所空气质量.用2-(1-甲氧基苯基)呱嗪和液相色谱法测定空气中的异氰酸盐总量
【标准号】:ISO16702-2007
【标准状态】:现行
【国别】:国际
【发布日期】:2007-12
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC146
【标准类型】:()
【标准水平】:()
【中文主题词】:空气;空气污染;空气质量;化学分析和试验;色谱法;解吸;含量测定;扩散取样器;异氰酸酯;液相色谱法;哌嗪;质量;取样;采样设备;技术数据单;工作地点;工作场所安全
【英文主题词】:Air;Airpollution;Airquality;Chemicalanalysisandtesting;Chromatography;Desorption;Determinationofcontent;Diffusivesamplers;Isocyanates;Liquidchromatography;Piperazine;Quality;Sampling;Samplingequipment;Technicaldatasheets;Workingplaces;Workplacesafety
【摘要】:ThisInternationalStandardgivesgeneralguidanceforthesamplingandanalysisofairborneorganicisocyanate(NCO)compoundsinworkplaceair.ThisInternationalStandardisappropriateforawiderangeoforganiccompoundscontainingisocyanatefunctionalgroups,includingisocyanatemonomersandprepolymers.Examplesofaromaticmonomersincludetoluenediisocyanate(TDI)(both2,4-and2,6-diisocyanatotoluene),naphthyldiisocyanate(NDI)(1,5-diisocyanatonaphthalene)andmethylenebis(4-phenylisocyanate)[MDI,systematicallynamedasdi-(4-isocyanatophenyl)methane].Examplesofaliphaticmonomersincludeisophoronediisocyanate(IPDI,systematicallynamedas1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane),methylenebis(cyclohexylisocyanate)(hydrogenatedMDI,HMDI)and1,6-diisocyanatohexane(HDI)(alsoknownas1,6-hexamethylenediisocyanate).Monomerscontainingasingleisocyanatemoiety(e.g.methylisocyanate,ethylisocyanate,phenylisocyanate,hexylisocyanate)areproducedduringthermaldegradationofpolyurethanes,i.e.flamebondingandlasercutting.Isocyanatepolymers,alsocalledpolyisocyanates,homopolymers,oligomersorprepolymers,arederivedfromthediisocyanatemonomersbyself-condensationorreactionwithpolyols.Polymericdiisocyanatesarewidelyusedinthepolyurethanes,paintsandcoatings,andadhesivesindustries.ThisInternationalStandardisappropriateformeasuringanyproductcontainingfreeisocyanategroups.ItwasdevelopedprimarilyforthecommonlyusedMDI,HDI,andTDI,andtheiroligomersandpolymers[1].IthasalsobeenusedforIPDI,HMDI,andNDI,andtheiroligomersandpolymers.TheexposurelimitforisocyanatesintheUKrequiresmeasurementoftotalisocyanategroups,i.e.monomericdiisocyanates,oligomeric,prepolymericandpolymericdiisocyanatesandmonoisocyanates.Becausethereareawiderangeofisocyanatestructuresandmolecularmasses,thechromatographicconditionsusedwillneedtobevariedaccordingtotheisocyanateformulationbeingdetermined.Ifbothisocyanatesandaminesarebelievedtobepresent,andbothneedtobedetermined,astandardwhichenablesthesimultaneousdeterminationofbothaminesandisocyanatesmaybemoreappropriate[2].Thismethodhasalsobeenmodifiedtoallowdeterminationofmono-isocyanatesproducedduringthermaldegradation[3],theuseofmassspectrometricdetection[4]andothersamplingequipment,e.g.37mmfiltersandotherfiltercassettes,butthesemodificationsarenotcoveredinthisInternationalStandard.Ifamodifiedversionofthismethodisbeingused,itistheresponsibilityoftheusertodemonstratethatthemodificationsarevalid.Themethodisusedtodeterminetime-weightedaverageconcentrationsoforganicisocyanatesinworkplaceatmospheres,andissuitableforsamplingoverperiodsintherange0,5minto8h.Themethodisdesignedforpersonalmonitoring,butcanalsobeusedforfixedlocationmonitoringbysuitablemodification.Themethodissuitableforthemeasurementofairborneorganicisocyanatesintheconcentrationrangefromapproximately0,1μg/m3to140μg/m3fora15lsamplevolume.Thequalitativeandquantitativedetectionlimitsforisocyanate,definedasthreetimesand10timesthestandarddeviationofsixblankdeterminations,havebeenfoundtobetypicallybetween0,001μgand0,004μgofisocyanatepersample,respectively(ECdetection).Fora15lairsample,thesevaluescorrespondtoqualitativeandquantitativedetectionlimitsof0,07μg/m3and0,3μg/m3,respectively.
【中国标准分类号】:C70
【国际标准分类号】:13_040_30
【页数】:35P;A4
【正文语种】:英语