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• W1994818862 abstract "The present work focused on the recycle of the sulfate and the metal ions from acidic wastewater discharged by nonferrous metallurgical industry. The effects of the temperature, the reactant concentration, the stirring speed and the metal ions on the reactive crystallization process of calcium sulfate between sulfuric acid and lime were systematically investigated. The morphology of the precipitated crystals evolved from platelet-like and needle-like shape to rod-like shape when the temperature was increased from 25 to 70 °C. An increase in the agglomeration of calcium sulfate was found with increasing lime concentration. Metal ions markedly retard the rate of crystallization of calcium sulfate dihydrate. The crystallization of gypsum was slowed with the existence of Mg2+ in the solution, and the morphology of gypsum was transformed from platelet-like shape to rod-like shape when Mg2+ concentration reached 0.08 mol·L−1. The amorphous ferric hydroxide was coated on the calcium sulfate after the co-precipitation process while Zn2+ and Al3+ ions in the solution enhanced the agglomeration of the calcium sulfate by absorbing on the surface of the crystals. Comprehensive acidic wastewater containing heavy metals was efficiently purified by the two stage lime neutralization technology, and highly agglomerated gypsum precipitates with needle-like shape were obtained. The precipitates could be purified by sulfuric acid washing, and the metal ions were effectively separated from the calcium sulfate by-products." @default.
• W1994818862 created "2016-06-24" @default.
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• W1994818862 date "2013-11-01" @default.
• W1994818862 modified "2023-10-13" @default.
• W1994818862 title "Reactive Crystallization of Calcium Sulfate Dihydrate from Acidic Wastewater and Lime" @default.
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• W1994818862 doi "https://doi.org/10.1016/s1004-9541(13)60626-6" @default.
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