侯金瑛 董宪姝

(太原理工大学矿业工程学院,山西省太原市,030024)



分散介质流变性对煤泥脱水性能的影响研究∗

侯金瑛 董宪姝

(太原理工大学矿业工程学院,山西省太原市,030024)

摘 要研究了絮凝剂添加量和煤泥粒径分布分别对晋城无烟煤脱水性能的影响规律,并结合分散介质流变性分析其作用机理。试验结果表明,随着絮凝剂添加量的增加,分散介质的粘度增大,过滤时受到的粘滞阻力也增大,导致脱水速率减小并使得滤饼水分增加;当煤泥粒度均匀度低时,细颗粒不易嵌入空隙,同时分散介质粘度小,过滤时粘滞阻力小,过滤速率大,但也造成了微细颗粒增多,使得水分增加;当絮凝剂添加量为50 g/t且煤泥粒度均匀度低时,脱水速率可达到7.51 m L/s,滤饼水分可保持在较低水平,为24.06％。

关键词脱水速率 粘度 粒度分布 絮凝剂

Research on the effect of rheological property of dispersion medium on the dewatering performance of coal slime

Hou Jinying,Dong Xianshu
(College of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

Abstract The influence rule of flocculant dosage and particle size distribution of coal slime on the dewatering performance of Jincheng anthracite was studied,and combining with the rheological property of dispersion medium,the action mechanism was analyzed.The test results indicated that the viscosity of dispersion medium was increased with the increasing of flocculant dosage,which leaded to the increase of viscous resistance and the decrease of dehydration rate,so that the water content of filter cake increased.Fine particles were not easy to be embedded into the gaps when the uniformity of coal slime＇s particle size was low,it leaded to the small viscosity of dispersion medium,the low viscous resistance and the high filtration rate,while it caused the increasing of minute particles and the water content of filter cake.When the flocculant concentration was 50 g/t and the uniformity of coal slime＇s particle size was low,the dehydration rate reached 7.51 m L/s and the water content of filter cake was 24.06％that was at a lower level.

Key words dehydration rate,viscosity,particle size distribution,flocculant

目前选煤厂中湿法选煤方法较多,随着国内外用户对煤炭产品水分要求的提高,对煤炭产品的脱水也提出了更高的要求.煤泥水沉降与压滤过程是在流体运动过程中实现的,其效果与悬浮液的流变特性有关,因此煤炭产品脱水过程中流变特性的研究是十分必要的.

国内外在浆体流变性方面的研究日益受到关注,对浆体的处理具有重要的意义.煤颗粒的大小、分布以及浓度对煤浆流变性有很大的影响,并可通过改变煤浆体系中煤的颗粒分布,在保持较高浓度时制备出具有较低黏度的油煤浆.絮凝污泥悬浮液体……