铜选矿废水对碱激发粉煤灰/矿渣胶凝材料性能的影响

Effect of copper mining wastewater on the properties ofalkali-activated fly ash/slag cementitious materials

为加速铜选矿废水(CMw)的资源化利用,采用CMw作为拌合水制备碱激发粉煤灰/矿渣(AAFS)胶凝材料,研究了不同CMw掺量对AAFS凝结时间、水化特性、水化产物、孔结构和抗压强度的影响。结果表明:在AAFS中掺入CMw会略微延长其凝结过程,但略微促进AAFS的水化过程,这与CMw的酸性、有机药剂残留和金属离子有关。通过掺入不同量CMw, AAFS的凝胶孔不断增加,而过渡孔体积逐渐减小,抗压强度呈现出先增大后略微降低的趋势。当CMw掺量为50%时,AAFS的抗压强度提升幅度最大,分别为12.23%(3 d)、21.07%(7 d)、16.74%(28 d)。研究结果可为铜选矿废水的资源化利用提供新的思路和参考。

This study employs copper mining wastewater(CMw)as mixing water to prepare alkali-activated fly ash/slag(AAFS)cementitious material,aiming to expedite the resourceful utilization of CMw.The influence of varying CMw dosages on the setting time,hydration characteristics,hydration products,pore structure,and compressive strength of AAFS was investigated through this study.The results indicate that the incorporation of CMw in AAFS slightly prolongs its setting process while slightly promoting the hydration process of AAFS.This phenomenon is attributed to the acidity of CMw,residual organic reagents,and metallic ions present.By adding varying amounts of CMw,the gel pores of AAFS continue increasing,while the transitional pores gradually decrease in volume.The compressive strength exhibits a trend of initial enhancement followed by a slight reduction.When the CMw dosage reaches 50%,the compressive strength of AAFS shows the greatest improvement,with increments of 12.23%(3 d),21.07%(7 d),and 16.74%(28 d),respectively.These research findings offer new insights and references for the resource utilization of copper mining wastewater.