中文摘要：

通过正交实验对木质素磺酸钠（SL）和丙烯酰胺（AM）接枝反应的条件进行了优化,考察了合成产物对烟煤成浆浓度、黏度和稳定性的影响,结果表明,当AM与SL质量比为1∶5,温度为40℃,引发剂K2S2O8-NaH SO3含量为3％条件下反应2.5h,得到的产物作为水煤浆分散剂,在添加量为0.8％（占干煤基的比例）,煤浆浓度为69％时,黏度为550 mPa·s,3d后的穿透率达74.75％;相同情况下使用未经改性的SL为分散剂制浆,黏度为610 mPa·s,3d后穿透率为70.68％,明显低于改性分散剂制浆的穿透率,且改性SL所制煤浆同未改性SL所制煤浆的析水率相比也降低了4.45％.

英文摘要：

Optimal conditions for grafting reaction of sodium lignosulfonate （SL） and acrylamide （AM） through orthogonal experiment were determined.And its influence on the slurry concentration,viscosity and stability of bituminous coal were observed with the modified products as coal water slurry （CWS） dispersants.The results of this experiment indicated that when the ratio of AM to SL is 1 ∶ 5,the temperature is 40 ℃,K2S2O8-NaHSO3 as an initiator,and the dosage of which is 3 ％,the reaction keeping time as 2.5 h,then the obtained is effective as a dispersant.When the amount of additive was 0.8％ of the mass of the dry coal,and the concentration of CWS was 69％,the viscosity was 550 mPa · s,and the penetration ratio after 3 d was 74.75％.Under the same conditions,unmodified SL had a higher viscosity of 610 mPa · s than the former,the penetration ratio after 3 d was 70.68％.The dewatering rate decreased by 4.45％ compared to the modified SL.