In order to improve the utilization efficiency of coal asphalt,the MLS(modified sodium lignosulfonate)dispersant was synthesized by sulfonation and condensation reaction with LS(sodium lignosulfonate)as main raw material to prepare coal asphalt slurry.The structure and properties of MLS were analyzed by FTIR(infrared spectroscopy)、XRD and surface tension.The optimum preparation conditions were investigated by response surface method,and the dispersion stability of the slurry was studied.The results show that the optimum preparation conditions of MLS dispersant are as follows:the mass fraction of sulfonated reagent 12％,the mass fraction of formaldehyde 18％,the mass fraction of urea 10％,the reaction temperature 80 ℃,and the reaction time 4 h.When the dosage of MLS is 0.5％,the maximum pulping mass fraction reaches 54.83％,while the maximum pulping concentration of LS is only 51.44％.And the slurry prepared by MLS dispersant belongs to yield pseudoplastic fluid,which conforms to Herschel-Bulkley model and has low yield stress.After standing for 5 d,the water extraction rate of LS and MLS prepared slurry is 3.45％and 2.30％,respectively,indicating that MLS has strong viscosity reduction and stability increase ability,which is conducive to improving the industrial application of coal asphalt water slurry.
关键词
改性木质素磺酸钠/响应曲面法/煤沥青水浆
Key words
modified sodium lignosulfonate/response surface method/coal pitch water slurry
维普
万方数据