Phosphogypsum based plastering gypsum

Abstract

The invention discloses a phosphogypsum based plastering gypsum, and relates to a plastering material for a building wall. The phosphogypsum based plastering gypsum mainly comprises 75 to 95 percent of phosphogypsum based building gypsum, 1 to 3 percent of sierozem powder, 0.1 to 0.5 percent of retarder, 1.1 to 5.5 percent of composite water retention agent, 0.3 to 1 percent of ethylene-vinyl acetate copolymerized latex powder, and 0 to 20 percent of stuffing. The phosphogypsum based plastering gypsum effectively improves water retention property and lowers cost by adopting the combination of cellulose ether water retention agent and bentonite, effectively adjusts settling time and prolongs operable time by adopting the retarder, improves construction property, cohesive property and cracking resistance by doping the stuffing and the latex powder, and reduces adverse effects of impurities on the strength of plastering gypsum by adding the sierozem powder. The phosphogypsum based plastering gypsum has the advantages of good workability and construction property, long operable time, high breaking resistance, compression resistance and adhesion strength, good volume stability, good cracking resistance and lower cost, and can be used for a plastering layer of the building wall.

Description

technical field [0001] The invention relates to a phosphogypsum-based plastering plaster as a plastering material for building walls. Background technique [0002] Phosphogypsum is industrial waste slag discharged during the production of phosphoric acid by wet process. Its main component is calcium sulfate dihydrate and contains a small amount of impurities such as phosphorus, fluorine and organic matter. Due to the influence of harmful impurities in phosphogypsum, it cannot be directly used to produce gypsum building materials. Gypsum plaster is a low-energy wall plastering material that has been vigorously advocated at home and abroad in recent years. Compared with lime mortar and cement mortar, stucco gypsum is friendly to the human body, has low energy consumption, good water retention, strong adhesion, and will not crack, bulge, or fall off. However, the performance of single-phase plaster prepared with traditional natural gypsum is variable and difficult to control;...

AI Technical Summary

Problems solved by technology

In this literature, the addition of retarder and water retaining agent was studied to modify phosphogypsum-based building gypsum to prepare plaster plaster. However, because only single-doped trisodium citrate retarder and inorganic mineral water retaining agent were selected, other modifications were not adopted. Therefore, the prepared stucco plaster has low strength, poor bonding and high cost