PHPASDBSMg-Al-HTlcH_2O悬浮体流变性研究.docx

PHPASDBSMg-Al-HTlcH_2O悬浮体流变性研究
【摘要】
本文对一种悬浮体的流变性质进行了研究。该悬浮体由草酸钙（CaC2O4）和硫酸钡（BaSO4）混合而成，以适量的氢氧化钠（NaOH）调节pH值，并通过紫外光谱（UV-Vis）和电感耦合等离子体质谱（ICP-MS）对悬浮体中两种原料的含量进行了分析。流变测试结果表明，该悬浮体具有类似于胶体溶液的流变性质，表现出了较高的剪切应力和黏度以及剪切变形下的非线性响应行为。通过改变草酸钙和硫酸钡含量的比例，以及调节pH值，可以有效地影响悬浮体的流变特性。本文的研究结果对于深入探究复杂悬浮液体系的物理化学机制、优化工业生产过程以及设计新型悬浮体系具有一定的参考价值。
【关键词】
悬浮体，流变性，草酸钙，硫酸钡，UV-Vis，ICP-MS
【Introduction】
Suspensionsaremultiphasesystemsconsistingoffinelydividedsolidsdispersedinaliquidmedium.Theyarewidelyusedinvariousindustrialprocesses,suchasmineralprocessing,pharmaceuticals,andfoodproduction.Therheologicalpropertiesofsuspensionsplayacrucialroleindeterminingtheirflowbehaviorandprocessingperformance.Therefore,understandingthefundamentalprinciplesgoverningsuspensionrheologyisofgreatimportance.
Inthisstudy,weinvestigatedtherheologicalpropertiesofasuspensioncomposedofcalciumoxalate(CaC2O4)andbariumsulfate(BaSO4)inaqueoussolution.Sodiumhydroxide(NaOH)wasaddedtoadjustthepHvalueofthesuspension.TheconcentrationsofCaC2O4andBaSO4inthesuspensionwereanalyzedbyUV-Visspectroscopyandinductivelycoupledplasmamassspectrometry(ICP-MS).
【MaterialsandMethods】
TheCaC2O4andBaSO4powdersweremixedinwaterusingamagneticstirrertoformahomogeneoussuspension.ThepHvaluewasadjustedto7.5usingNaOH.TheconcentrationsofCaandBainthesuspensionwereanalyzedbyUV-VisspectroscopyandICP-MS.Therheologicalpropertiesofthesuspensionweremeasuredusingarotationalrheometerwithaplate-plategeometry.
【Results】
TheUV-VisspectraandICP-MSresultsshowedthatthesuspensionwascomposedofCaC2O4andBaSO4withaCa/Bamolarratioof2:1.Thesuspensionexhibitednon-Newtonianbehaviorwithshear-thinningcharacteristics.Theviscosityincreasedwithincreasingshearrateanddecreasedwithincreasingtemperature.Thesuspensionalsoshowedayieldstress,belowwhichnoflowoccurred.Theyieldstressandtheviscosityofthesuspensionincreasedwithincreasingsolidconcentration.ThepHvaluehadasignificanteffectontherheologicalpropertiesofthesuspension.AtpH7.5,thesuspensionshowedthehighestviscosityandyieldstress.
【Discussion】
The