Preparation of Kilogram Scale α-Hemihydrate Gypsum Powder Using Semi Dry Method and its Process Energy Consumption Calculation
This article uses phosphogypsum and desulfurization gypsum as raw materials and adopts a semi dry process to achieve preparation ex-periment of α-hemihydrate gypsum powder at the kilogram level.Using SEM field emission scanning electron microscopy and Malvin laser par-ticle size analyzer,morphology and particle size distribution of α-semi hydrated gypsum powder were analyzed.Two types of α-phase compo-sition analysis and mechanical property strength of semi hydrated gypsum powder were compared.The results indicate that the conversion rate of hemihydrate gypsum phase in hemihydrate gypsum powder is about90%,and the aspect ratio of crystals is close to1.The mechanical properties of phosphite based gypsum α-hemihydrate gypsum powder are the best,with a 2-hour flexural strength of 2.6 MPa and an absolute dry com-pressive strength of 13.6 MPa.Calculating the energy consumption of the semi dry process,compared with the traditional calcination method,the energy consumption is reduced by about 29.5%.The process is simple and green,proving the feasibility of the mass production preparation of the semi dry process of α-semi hydrated gypsum powder in industry.
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