某铜铅锌矿早强胶凝材料配比试验与优化

Proportioning Test and Optimization of Early-Strength Cementitious Materials in a Copper-lead-zinc Mine

针对某铜铅锌矿已建成的胶凝材料混料系统,采用脱硫石膏、碱性激发剂、早强剂等材料作为矿渣微粉复合激发剂,开展满足该矿充填采矿早凝、早强要求的胶凝材料配方正交试验。结果表明:脱硫石膏掺量为3%时,充填体胶结成形较好,在硫酸盐的激发作用下,矿渣中的活性成分能够不断地反应生成水硬性钙矾石(AFt);随着碱性激发剂掺量增加,胶结充填体强度显著提高,并在25%时达到最优,表明该掺量下使得矿渣水化程度较好;在此基础上,对比了几种早强剂对胶凝充填体3d强度的影响,并无增强效果;当脱硫石膏、碱性激发剂、矿渣微粉的掺量分别为3%、25%、72%时,胶结充填体3d的抗压强提高到0.69MPa,终凝时间小于30h,可满足该矿充填采矿对胶凝材料早强的要求,且成本控制在合理范围。

Aiming at the established cementitious material mixing system of a copper-lead-zinc mine,desulphurized gypsum,alkaline activator,early-strength agent and other materials were used as slag powder composite activator to carry out the orthogonal test of cementitious material formula which met the requirements of early-coagulation and early-strength of filling mining.The results showed that:when the amount of desulfurization gypsum was 3%,the cementation of filling body was good.Under the action of sulfate,the active components in the slag can continuously react to form hydraulic ettringite(AFt).With the increase of content of alkaline activator,the strength of cemented backfill was significantly improved,and was optimal at 25%,which proved that the hydration degree of slag was better under this dosage.On this basis,the effects of several earlystrength agents on the strength of cemented fillings in 3 d were compared,and there was no enhancement effect.Finally,when the content of desulfurization gypsum,alkaline activator and slag powder was 3%,25%,72% respectively,the compressive strength of the cemented backfill in 3 d was increased to 0.69 MPa,and the final coagulation time was less than 30 h,which met the requirements for the early-strength of the cementitious material in the filling mining,and the cost control was in a reasonable range.