Abstract: Lithium slag (LS) is one of waste residues in the lithium battery industry.In this paper, the LS-based artificial aggregate was designed and prepared through alkali-activated technology, during which the mix proportion of lithium slag and alkali activator was experimentally studied. The single-particle strength of LS-based artificial aggregate was measured by a particle strength meter, while the physical properties of such aggregates, such as pelleting types, particle size and water absorption, were characterized according to national standard codes. The microstructure of LS-based artificial aggregate was studied by scanning electron microscope (SEM). In particular, the internal pore structure of the aggregate was further analyzed by X-ray computed tomography (XCT). The results showed that the optimized aggregates (i.e., LS50-6) held the compressive strength of 5.25 MPa, reaching the final compressive strength in 3 days. In terms of microstructure, the density of produced aggregate decreased with the increase of lithium slag content, but increased with the activator dosage. The internal pore distribution of the LS-based artificial aggregate sized up from the surface to the center. These properties of LS-based artificial aggregates indicated that such aggregate could be potentially used in lightweight concrete.
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2021, Vol. 35 
