由玉米秸秆制备水煤浆添加剂及成浆性研究

PREPARATION OF BIOMASS ADDITIVE AND STUDY ON SLURRY ABILITY OF HIGH CONCENTRATION CWS

以廉价的玉米秸秆提取物木质素为原料,通过磺甲基化法改性制备水煤浆（coal wa-ter slurry,CWS）添加剂,实验发现合成磺化木质素的最佳工艺条件是：温度T=90℃～95℃,Na2 SO3与木质素质量比2∶1,时间t=6h,37％的甲醛溶液用量为2 mL;红外光谱表明改性物在979 cm-1和633 cm-1处出现了新的强吸收峰;白金版法测定溶液表面张力可降低至36.806 mN/m,说明木质素磺化改性是成功和有效的.作为分散剂将其用于CWS成浆性实验发现：改性产物对CWS能够起到很好的降黏增浓作用,在分散剂使用量为1％的条件下,CWS浓度可高达70％以上,流动性为A级,流速较快且连续,流型细腻,稳定时间达25 d且无硬沉淀产生.

As a raw material,lignin from cheap maize straw could be modified to synthesizing additive through suffocated method,the optimal process parameters of synthesizing suffocated lignin：temperature is 90 ℃-95 ℃,the ratio of mass of and Na2SO3 and lignin is 2,reaction time is 6 h,the dosage of 37％ HCHO is 2 mL/g（lignin）.The infrared characterization demonstrates that suffocated lignin has new absorption peak at 979 cm 1 and 633 cm-1 ; the surface tension was determined by Baijinban method.It indicates that lignin is modified successfully and effectually.As a dispersant,suffocated lignin is used to study slurry ability of CWS,it is able to reducing apparent viscosity and raising concentration of CWS effectively,when the dosage of dispersant is 1％,the concentration of CWS attains to 70％,liquidity is grade A,velocity faster and unremitting,flow pattern is exquisite,settling time is to 25 d,no hard precipitation.