Coupling Activation Mechanism Analysis of Ternary Solid Waste Admixture
In order to realize the recycling and utilization of iron tailings solid waste and improve the utilization rate of industrial solid waste,a ternary solid waste admixture(iron tailings,ceramic powder and steel slag)was composed of ceramic powder and steel slag for coupling activation.The activity of iron tailings was improved by mechanical grinding at different times and chemical activation by adding different activators.The coupling activation and mechanical-chemical activation mechanism of ternary admixtures were studied by means of DTA-TG and SEM.The results showed that the activity index of the admixture system could be improved by appropriately increasing the grinding time of the iron tailings,and the active agent Na-2SiO3 was the most obvious factor for the activity deduction of the admixture system.In the ternary admixture system,iron tailings and ceramic powder mainly played the role of filling,while active CaO,C2S and C3S in the steel slag could participate in the hydration reaction to generate more hydration products and improve the late strength.The three materials had coupling effect,and the activity index met the standard of ordinary class Ⅱ admixture,and the highest activity index could reach 88.29%,which had the potential to prepare ternary composite admixture.
iron tailingsceramic powdersteel slagadmixturecoupling activationchemical activation
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