Mechanism of Hydration and Salting-Out of Cement-Based Activated Lepidolite Slag
Taking cement-based activated lithium slag salt precipitation as the starting point,mechanical activation,chemical activation,and different humidity curing were used to study the specimen's salting-out phenomenon,product types,and microscopic morphology by XRD,SEM and ICP-MS.The results show that calcium hydroxide and sodium silicate could improve the hardened mechanical properties of lithium slag 1 and lithium slag 2,respectively.The mechanical activation effect was better than chemical activation,and the strength of activated lithium slag with 10%cement can reach 12.3 MPa and 16.4 MPa at 7 d and 28 d in wet curing.However,alkali excitation led to the decomposition of sulfoaluminate minerals in the lithium slag,which increased the concentration of soluble salt to promote the occurrence of salting-out.The humidity condition promotes the ionic mi-gration and diffusion of alkaline-excited lithium slag,which is a necessary condition for the lithium slag gypsum phase to become fibrous and hairy and the occurrence of salting-out.Mechanical activation optimizes the pore structure and specific surface area of lithium slag,which can effectively prevent lithium slag salting-out and increase mechanical properties.
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