摘要
为研究煤胶体在多孔介质中的运移行为,提取并分析了1~2μm、2~5μm、5~10μm三种不同粒径的煤胶体的粒度分布及Zeta电位特征.通过穿透曲线实验考察了pH在4~9内、离子强度由1mmol·L^( -1)变化到0.001mmol·L^( -1)时不同粒径煤胶体在多孔介质中的迁移特征.结果表明:煤胶体带负电,且其Zeta电位绝对值随pH的增大而增大,随离子强度的增大而减小;煤胶体在多孔介质中的运移能力与粒径成反比;当pH为7时,煤胶体在多孔介质中的能力最强;三种粒径的煤胶体穿透能力随着溶液的离子强度由1 mmol·L^(-1 )变化到0.001 mmol·L^(-1 )时增强,表明无机离子导致煤胶体在多孔介质中沉降从而限制其迁移.
In order to study the migration characteristics of coal colloid in porous media,the particle size distribution and Zeta potential characteristics of coal colloid with different particle sizes of 1~2μm,2~5μm and 5~10μm were extracted and analyzed.The migration characteristics of coal colloid with different particle sizes in porous media were investigated by the breakthrough curve experiment when the pH range was 4~9 and the ionic strength changed from 1 mmol·L ^(-1 ) to 0.001 mmol·L^(-1 ).The results show that the colloid is usually negatively charged.The absolute value of zeta potential of the coal colloid increases with the increase of pH,while decreases with the increase in ion concentration.The transport ability of the colloid in porous media is negative related with its size.Under the condition of experiment,the transport ability of the colloid in porous media reach the highest when pH=7.The migration capacity of coal colloid with three particle sizes was enhanced with the change of the ionic strength of the solution changes from 1 mmol·L^(-1 ) to 0.001 mmol·L^(-1 ).The inorganic ions made the coal colloid deposit and restrained the transport of the colloid in porous media.
作者
戴梦嘉
许端平
DAI Mengjia;XU Duanping(College of Resources and Environment Engineering,Liaoning Technical University,Fuxin 123000,China)
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2020年第6期491-497,共7页
Journal of Liaoning Technical University (Natural Science)
基金
国家自然科学基金(41373125)
辽宁工程技术大学生产技术问题创新研究基金(20160005T)
辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金(LNTU15KF13)
关键词
煤胶体
多孔介质
粒径
离子强度
运移行为
colloids from coal
porous media
particle size
ionic strength
migration behavior
