Phosphogypsum-based light-weight insulation board and preparation method thereof

The invention relates to a phosphogypsum-based light-weight insulation board and a preparation method thereof. The phosphogypsum-based light-weight insulation board is prepared from the following raw material components in parts by weight: 100 parts of phosphorus building gypsum, 10-30 parts of high-strength gypsum, 3-12 parts of lightweight aggregates, 0.1-0.3 part of a dispersing agent, 0.3-0.5 part of a retarder, 0.2-0.4 part of a water-retaining agent and 0.1-0.3 part of an air entraining agent. The preparation method comprises the following steps: adding water into a stirring machine in a water-cement ratio of (0.70-0.80):1, adding the air entraining agent, the retarder, the dispersing agent and the water-retaining agent, stirring, then adding a dry material, obtained by uniformly mixing the phosphorus building gypsum, high-strength gypsum and lightweight aggregates, into the stirring machine, continuously stirring to obtain slurry, paving basalt fiber mesh cloth in a bottom die of a gypsum board forming die, pouring into the slurry, vibrating for 1 minute, then paving a layer of basalt fiber mesh cloth on the surface layer, closing a cover die of the gypsum board forming die, carrying out roller forming, taking apart the die after solidification, and drying, so that the phosphogypsum-based light-weight insulation board is obtained.