Enhancing hydration activity of titanium-bearing blast furnace slag based cementitious materials using combined mechanical grinding and chemical agents
Enhancing hydration activity of titanium-bearing blast furnace slag based cementitious materials using combined mechanical grinding and chemical agents
Titanium-bearing blast furnace slag,produced from the smelting process of vanadium-titanium magnetite concentrate,was used as raw material.The hydration activity of the slag was activated through the combined application of mechanical grinding and chemical activators.The activation mechanism was elucidated by analyzing the mineral composition,crystal structure,and particle size distribution of the slag particles using XRD,FTIR,SEM,and a laser particle size analyzer,along with examining changes in the mechanical properties of the samples.The results show that the compressive strength of the samples increases with the extension of mechanical grinding time.The intensity of the characteristic diffraction peak of the crystalline mineral phase CaTiO3 decreases continuously.The crystallinity decreases by 22.7％,25.6％,32.8％and 35.7％after grinding for 1,2,3 and 4 hours,respectively,indicating an increased degree of amorphization.When chemical agents are added to titanium-bearing blast furnace slag powder ground for 3 h,the crystallinity of CaTiO3 is further reduced by 9.21％.Additionally,the chemical agents exhibit an erosive activation effect on the titanium-bearing blast furnace slag,synergistically enhancing the hydration reaction effect through mechanical grinding and promoting the efficient resource utilization of titanium-bearing blast furnace slag.
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