Study on the Regeneration Process of High Calcium Wastewater by CO2 Waste Gas
In this study,the purpose of waste water recycling and waste gas decarburization was realized by using CO2 waste gas to remove Ca from chlorine salt wastewater,which produced by magnesite decalcification,"using waste to treat waste"and collaborative treatment.The optimal conditions for regenerating Ca-containing waste water were as follows:the ratio of waste gas flow to solution is 0.2((mLgas/min)/mLliquid),CO2 content in waste gas was 33％,precipitation temperature was 40 ℃,MgO addition amount was 1.2 times the theoretical amount,and precipitation time was 4 hours,stirring line speed 3.3 m/s.Under these conditions,the calcium precipitation rate is 99.62％,and the calcium carbonate content in the calcium removal slag is 97.35％,which can be used as industrial calcium carbonate products.In addition,the molar ratio of Ca/Mg in the solution is decreased to 0.003 3 after calcium removal,and the solution can be effectively recycled for the decalcification of calcium-containing magnesite,which has significant social and economic benefits.
calcium-containing wastewatermagnesium oxide decalcificationwaste gas decarburizationcarbon peaking and carbon neutralitymagnesite
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