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- W2978850672 abstract "To recycle desulfurization slag from phosphorous gypsum,spherical calcium carbonate was prepared from calcium-containing phosphorus gypsum desulfurization slag. The composition of raw materials were analyzed by XRD and SEM. The main substance was calcium oxide and the main impurity was silica. It also contained a small amount of iron,aluminum and magnesium. A new process leaching desulfurization slag by ammonium chloride and subsequent carbonization was firstly proposed. The affecting factors, such as amount of ammonium chloride, ratio of water and desulfurization slag(mass ratio),and temperature on the performance of leaching were investigated. The optimal conditions were: Amount of ammonium chloride 50% of the total weight of the solid,ratio of water and desulfurization slag 9∶1,temperature 40℃. Conversion of calcium was about 67.98% and removal of silica was 97.80% under the optimal conditions. The purity of the obtained calcium carbonate was 97.90%,sedimentation volume was 3.5m L/g and whiteness was 94.2,meeting the norm of first grade product in General Industrial Precipitated Calcium Carbonate(HG/T 2226—2010). Main polymorph of calcium carbonate crystals was vaterite." @default.
- W2978850672 created "2019-10-10" @default.
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- W2978850672 date "2015-01-01" @default.
- W2978850672 modified "2023-09-28" @default.
- W2978850672 title "Preparation of light calcium carbonate from phosphorus gypsum desulfurization slag" @default.
- W2978850672 hasPublicationYear "2015" @default.
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