At present,the production of building gypsum from phosphogypsum requires the pH of raw material to be more than 4.5.Using 450 kt/a building gypsum/type Ⅱ anhydrous gypsum flexible production plant by fluidized calcination of phosphogypsum as a platform,experiments are conducted on low pH phosphogypsum with medium temperature flash firing for impurity removal and bagging for aging treatment,exploring its feasibility in industrial application.The results show that the 2 hours flexural strength of product reaches over 2.0 MPa using phosphogypsum with pH of 3.5-4.0,meeting the quality requirements of handmade block products.
low pH phosphogypsumfluidized calcinationmedium temperature flash firingagingbuilding gypsumindustrial production
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