矿渣-脱硫灰基固结剂的尾砂固结效果

为开发利用矿渣和脱硫渣，以矿渣和脱硫灰为主要原料，掺入少量石灰石和活性激发剂后，粉磨制得矿渣脱硫渣基固结剂（矿渣、脱硫灰、石灰石、激发剂的配合比为81∶13∶2.5∶3.5），并以该固结剂为胶凝材料，以2种不同性质的尾矿为固结对象，对比了固结剂料浆和32.5#水泥料浆的流动度、保水性以及不同养护龄期固结体的无侧限抗压强度。结果表明：固结剂的基本性能指标达到，甚至优于32.5#水泥；固结剂料浆的流动度、保水性均略高于相同条件下的32.5#水泥料浆；提高固结剂的掺量、延长养护时间，其固结体的无侧限抗压强度越高；相同条件下，固结剂固结尾矿的能力明显优于水泥，固结剂掺量为5%时固结体的无侧限抗压强度和水泥掺量为10%的固结体的强度相当。因此，矿渣-脱硫渣基固结剂可以替代32.5#水泥用于尾矿的固结。微观分析表明，随着养护龄期的延长，胶凝材料的水化反应越来越充分，凝胶逐渐充填尾矿颗粒间隙，固结体越来越密实，抗压强度越来越高。

Effect of Tailings Consolidating with Slag-Desulfurization Ash-Based Consolidation Agents

In order to utilize slag and desulfurization ash,consolidation agent is synthesized using slag and ash as the main raw material,and adding a small amount of limestone and activator.The optimum mass ratio of slag,ash,limestone,activator is 81∶13∶2.5∶3.5.Mortar fluidity and bleeding quantity of tailing cementation slurry,and the unconfined compressive strength after different curing times were tested,taking the two tailings different in property as research object.Experimental results showed that the basic properties of consolidation agent are somehow better than that of 32.5# cement.Mortar fluidity and bleeding quantity of tailing slurry by using consolidation agent were higher than that of 32.5# cement.Increasing consolidation agent dosage and extending curing times would be favorable to raise the unconfined compressive strength.The solidification effect of slag-desulfurization ash-based consolidation agent was significantly better than cement under the same conditions.Unconfined compressive strength of indurations compound with 5% consolidation agent is nearly adding 10% cement.Therefore,the slag-desulfurization ash-based consolidation agent can substitute for 32.5# cement in solidify tailings.The microscopic experimental results indicated that the main reason of raising compressive strength was making cementing material hydration react completely with curing time extending.And gel filled interspace between tailing particles in the hydration reaction of cementing material,which caused the tailings solidification bodies relatively more dense and higher compressive strength. 