Lithium slag filled paper and preparation method thereof

The invention provides lithium slag filled paper and a preparation method thereof, and belongs to the technical field of papermaking filler, and the preparation method comprises the following steps: providing lithium slag filler which is prepared by pretreating lithium slag waste; lithium slag filler liquid is provided, and the lithium slag filler liquid contains lithium slag filler and deionized water; providing mixed pulp, wherein the mixed pulp is prepared by defibering and pulping a plant fiber pulp board; mixing the lithium slag filler liquid with the mixed slurry, and adding a retention and drainage aid to prepare paper slurry; and forming the paper slurry on a net, and then squeezing and drying to obtain the lithium slag filled paper. The pretreatment of the lithium slag waste comprises acid treatment, and acid for acid treatment is weak acid. According to the method, the lithium slag waste is used as the papermaking filler after being pretreated, so that the mechanical strength of the filled paper can