Pit filling and ecological restoration material containing phosphogypsum and preparation method thereof

The invention belongs to the technical field of phosphogypsum harmless treatment and recycling, and particularly relates to a phosphogypsum-containing mine pit filling and ecological restoration material and a preparation method thereof. The phosphogypsum is prepared from 80-96 parts of dry-basis phosphogypsum, 1-5 parts of a fluorine fixing agent, 1-10 parts of a curing agent, 1-3 parts of an exciting agent and 0.5-1 part of an inorganic polymer additive. The phosphogypsum-based pit filling and ecological restoration material is prepared by the following steps of: performing an interaction and complex reaction process on an additive and the phosphogypsum to form a plurality of composite substance mixtures, generating an obvious synergistic effect, exchanging, fixing, trapping, absorbing and adsorbing water-soluble phosphorus, fluorine, heavy metal ions and the like in the phosphogypsum, and aging and curing for a certain time, so as to obtain the phosphogypsum-based pit filling and ecological restoration mat