Gypsum crystallization was experimented under the conditions of the simulated dihydrate process of phosphoric acid production.The turbidity of the reaction mixture was measured at different periods to determine the induction time and the growth efficiency of gypsum crystal formation.Two kinds of surfactants were added to investigate their effect on the crystallization habits and mechanics property of phosphogypsum
and the internal microstructure of gypsum using Scanning Electron Microscope was studied.The results show that the strength of phosphogypsum is improved after surfactant MN is added
while the strength of phosphogypsum is reduced after surfactant LAS is added.
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references
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