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

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a phosphogypsum-based lightweight thermal insulation board and a preparation method thereof. Background technique [0002] Phosphogypsum is an industrial by-product produced during the wet production of phosphoric acid. Phosphate rock reacts with sulfuric acid to form a slurry-like mixture, which contains liquid phosphoric acid and solid calcium sulfate residues. Phosphoric acid and calcium sulfate are separated by filtration and washing , The resulting calcium sulfate residue is phosphogypsum. Phosphogypsum contains residual phosphoric acid and hydrofluoric acid from the above-mentioned reactions, and random stacking pollutes natural resources such as soil and groundwater and damages the ecological environment. At present, the cumulative discharge of phosphogypsum in the world has exceeded 5.6 billion tons, and the stockpile of phosphogypsum in my country has also exce...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN203213386U adopts the method of gypsum board compounding or bonding reflective thermal insulation coating or thermal insulation coating to achieve thermal insulation effect, but its process is complicated and the cost is high

Chinese patent CN102584321A discloses a method of using solid waste such as iron tailings to add adhesives, fluxes, toughening agents, and foaming agents, and mix and sinter to obtain light-weight insulation materials. However, high-temperature sintering consumes a lot of energy, and The requirements for the mold are also high