不同减水剂对某矿高浓度充填料浆输送性能影响研究

本文采用聚羧酸减水剂、萘系减水剂和三聚氰胺减水剂，通过实验分析不同减水剂及添加量对充填料浆塌落度及扩展度的影响，将测得的塌落度值与Murate模型理论相结合，计算料浆屈服应力。结果表明：当加入0.05%的聚羧酸减水剂，料浆的屈服应力从接近400 Pa降为小于60 Pa，有利于管道输送，继续增加聚羧酸减水剂为0.2%时，料浆开始发生离析；加入萘系减水剂的料浆，当添加量为0.5%时，料浆的屈服应力小于60 Pa，流动性达到最优，继续加入萘系减水剂对充填体强度带来负面影响。加入三聚氰胺减水剂的充填料浆，减水剂的最优添加量为0.5%，小于0.5%时，无法满足自流输送的要求，大于0.5%时，将影响高质量料浆的形成。综合三者的屈服应力及经济成本分析，聚羧酸减水剂的使用效果要优于萘系减水剂及三聚氰胺减水剂，更有利于改善料浆的流动性。

Study on the influence of different water reducing agents on the transportation performance of high concentration filling slurry in a mine

In this paper, polycarboxylate superplasticizer, naphthalene superplasticizer and melamine superplasticizer are used to analyze the influence of different superplasticizers and addition amount on the slump and expansion of filling slurry. The measured slump value is combined with murate model theory to calculate the yield stress of slurry. The results show that: when 0.05% polycarboxylate superplasticizer is added, the yield stress of slurry decreases from nearly 400 Pa to less than 60 Pa, which is conducive to pipeline transportation. When the polycarboxylate superplasticizer is continuously increased to 0.2%, the slurry begins to segregate; when the amount of naphthalene superplasticizer is 0.5%, the yield stress of slurry is less than 60 Pa, and the fluidity is optimal The strength of filling body has a negative effect. The optimal dosage of melamine superplasticizer is 0.5%. When it is less than 0.5%, it can not meet the requirements of gravity transportation. When it is more than 0.5%, it will affect the formation of high-quality slurry. According to the yield stress and economic cost analysis, the effect of polycarboxylate superplasticizer is better than that of naphthalene superplasticizer and melamine superplasticizer, which is more conducive to improve the fluidity of slurry.