Production of building gypsum by fluidized calcination of low pH phosphogypsum
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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