Abstract: 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. 

Key words: Slag, Desulfurization ash, Consolidation agent, Fluidity, Water retention, Unconfined compressive strength