煤矿安全2026，Vol.57Issue(7)：27-39,13.DOI:10.13347/j.cnki.mkaq.20250917
不同离子类型表面活性剂复配增强煤尘润湿性研究
Study on enhancing coal dust wettability by surfactant compounding with different ion types
摘要
Abstract
To improve the wetting effect of surfactants on coal dust,the influences of three compound systems,namely anionic+no-nionic,anionic+cationic,and cationic+nonionic surfactants,on the wettability of coal dust were investigated through experiments and molecular dynamics simulations,and the droplet size distribution was also studied.The results show that the compound surfact-ants exhibit either synergistic or antagonistic effects compared with the two single surfactants in the combination.Based on the ana-lysis of synergistic effects,three types of compound systems were optimized using the spreading work index:anionic+nonionic sys-tem of sodium secondary alkyl sulfonate+alkyl polyglycoside(SAS-60+APG),anionic+cationic system of sodium alcohol ether sulfate+cetyltrimethylammonium chloride(AES+CTAC),and cationic+nonionic system of dodecyltrimethylammonium chloride+alkyl polyglycoside(DTAC+APG).In-depth research on the coal dust wetting performance of these systems was carried out.The AES+CTAC system has the lowest surface tension and contact angle,but shows a long coal dust settling time and poor wetting abil-ity.The main reason is that after the two single molecules dissociate into anions and cations in solution respectively,the residual groups attract each other to form a denser adsorption layer at the gas-liquid interface.This adsorption layer promotes easier spread-ing of the liquid,resulting in lower surface tension and contact angle.The SAS-60+APG system has the shortest coal dust settling time of 104 s for complete settlement,indicating the strongest wetting effect on coal dust.In the droplet size test,the D50 and D90 of the DTAC+APG system are the smallest.The D90 of the SAS-60+APG system is close to that of DTAC+APG,but its D50 is signific-antly larger.This is because the long hydrophobic carbon chain of SAS-60 increases the volume of single micelles in the solution and enhances the steric hindrance effect,making it difficult for the solution to be dispersed into small droplets.The droplet sizes of both systems are much smaller than those of water and AES+CTAC,which is beneficial to collision and settlement with coal dust.Mo-lecular dynamics(MD)simulation results further show that in the SAS-60+APG mixture,surfactant molecules exhibit the strongest attraction to water molecules,promoting the formation of hydrogen bonds and van der Waals forces among water molecules,surfact-ant molecules and coal molecules.This allows more water molecules to adsorb on the coal surface,increases the coal-water overlap-ping area,and weakens the disordered motion of water molecules,exhibiting better wettability toward coal dust.关键词
表面活性剂/离子类型/煤尘/雾滴粒径/分子模拟Key words
surfactant/ion type/coal dust/droplet size/molecular simulation分类
矿业与冶金引用本文复制引用
张旭,李世航,户书达,魏英超,侯淦,靳昊,骆宇晨,任波,屠坤坤..不同离子类型表面活性剂复配增强煤尘润湿性研究[J].煤矿安全,2026,57(7):27-39,13.基金项目
国家自然科学基金面上资助项目(52474259,52174215) （52474259,52174215）
国家重点研发计划资助项目(2023YFC3010604) （2023YFC3010604）
深部煤炭安全开采与环境保护全国重点实验室开放基金资助项目(HNKY2024YB407) （HNKY2024YB407）
