Lithium slag-based composite cementitious material and preparation method thereof

A preparation method of a lithium slag-based composite cementitious material, comprising:

• S100, mixing lithium slag with an inorganic acid solution and then performing an activation treatment to obtain an activated material, wherein the components of the lithium slag comprise aluminosilicate and calcium oxide;
• S200, mechanically mixing an alkaline substance with the activated material to obtain a modified material having a pH value of 7 to 10, and then drying the modified material to obtain a modified powder;
• and
• S300, pulverizing the modified powder and an auxiliary material to obtain the lithium slag-based composite cementitious material;
• wherein the alkaline substance in step S200 comprises at least one of carbide slag, steel slag, magnesium slag, calcium hydroxide, or sodium hydroxide;
• the auxiliary material comprises at least one of slag, clinker, fly ash, or gypsum;
• and the mass of the auxiliary material added accounts for 40% to 60% of the mass of the lithium slag.