高温高浓竹浆黑液流变性及膨胀性研究

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1、高温高浓竹浆黑液流变性及膨胀性研究岳小鹏杜蠢徐永建实整室陕西科技太学初座工_程学院摘要：碱回收蒸发系统新技术的应用，使入炉黑液固含量超过70%，因此有必要研宄高固含量黑液的流变性能.如4102在燃烧法除硅工艺中除硅效果极佳，需要探宂其对竹浆黑液膨胀性带来的影响.本文利用AR2000ex动态流变仪，在70°C和98°C高温条件下对固含量为70.19%和79.87%的竹浆黑液的流变特性进行研究，发现在0l00s"1剪切速率范围内竹浆黑液符合假塑性流体的流动特征，且呈现出较强的弹性固体性质.提高温度可

2、以有效降低黑液的表观粘度，减弱黑液的假塑性，削弱其内部结构强度，有助于黑液在碱回收过程中的输送.通过对黑液等温膨胀体积指数(VIE)的测定，发现NaAlOr*加量为0.5%时，黑液的膨胀率最大,继续加大添加量会抑制黑液的膨胀.关键词：黑液;流变特性;假塑性;膨胀性;作者简介.•岳小鹏(1982-),男，山东青岛人，讲师，博士，研宂方向:生物质复合材料作者简介：徐永建(1970_)，男，陕两两安人，教授，博士生导师，研究方向：植物纤维资源高值化利用、清洁生产及碱回收除硅技术，154197301@q

3、q.com收稿日期：2017-07-27基金：国家十二五科技支撑计划项目(2012BAD23B02)StudyonrheologicalpropertiesandexpansionofthickbambookraftblackliquorathightemperatureYUEXiao-pengDUXinXUYong-jianShaanxiJProvinceKevLabora^oryofPapermakingTechnologyandSpecialtyPaper，ShaanxiUniversit

4、yofScience&Technology;Abstract：Itisnecessarytostudytherheologicalpropertiesofblackliquoratahighsolidcontentabove70wt°/oduetothedevelopmentofnewtechnologyfortherecoveryunitinpulpandpaperindustry.Addingsodiumaluminatecanensurehighefficiencyinthemethodo

5、fblackliquorcombustiontoremovesilicon.Nevertheless,theeffectofsodiumaluminateontheexpansionofblackliquorshouldnotbeignored.Therheologicalpropertiesofthickbambookraftblackliquor(70.19wt%and79.87wt%)atdifferenttemperatures(70°Cand98°C)wereinvestigatedb

6、yanAR2000exrotationalrheometer.Theresultsprovedthattheflowabilityofthebambookraftblackliquorobeyedthelawofpseudoplasticfluidintheshearraterangeof0!00sThickbambookraftblackliquorrepresentedstrongelasticsolidproperties.Theapparentviscosityofblackliquor

7、couldbereducedeffectivelywiththeincreaseoftemperature.Hightemperaturealsoweakenedthepseudoplasticcharacteristicsofblackliquor,aswellastheintensityofthemolecularstructureofblackliquor.Therefore,itwasbenefitforthetransportationofblack1iquor.Asanindicat

8、ionofexpansionofblackliquor,thevolumetricisothermalexpansivety(VIE)reachedthemaximumvaluewhentheloadingofsodiumaluminatewas0.5wt%.Theexpansionoftheblackliquorwouldbesuppressediftheloadingwasincreasedcontinued.Keyword：blackliquor;rheologicalproperties