绿色矿冶

In this paper, the particle size, composition, radioactivity, corrosion and leaching toxicity of a tungsten tailings in Hunan were analyzed. The results show that the main components of the tungsten tailings are SiO_2, CaO and Fe₂O₃, which are basically consistent with the mineral composition required for cement hydration. The radioactive, corrosive and leaching toxicity indexes are lower than the limit values of national standard, indicating that the tungsten tailings are harmless to the environment and can be explored for resource utilization. On this basis, using the tungsten tailings as the main raw material, a new type of composite admixture was prepared by physical excitation and chemical excitation, using reasonable raw material mix ratio and advanced preparation process, and the performance of the new composite admixture was tested and analyzed by mortar method and test cake method respectively. The test results show that the 28d activity index of 1^# and 2^# samples of the new composite admixture with moderate amount of tungsten tailings micropowder, large amount of grinding aid admixture and alkaline activator is ≥95%, and the stability of five samples is qualified. When the amount of tungsten tailings powder is constant, the increase of activity index of new composite admixture is proportional to the amount of grinding aid admixture and alkaline activator, and the activation effect of alkaline excitation plays a certain role in promoting the increase of activity index.