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科学通报  2014 

氯化镁矿化利用低浓度烟气CO2联产碳酸镁

DOI: 10.1360/csb2014-59-19-1797, PP. 1797-1803

Keywords: CO2矿化利用,CCUS,氯化镁,电解,碳酸镁

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Abstract:

CO2矿化利用是一种新的CO2减排方式,主要原理是利用天然矿物或工业废料与CO2反应,将CO2矿化为碳酸钙或碳酸镁等固体碳酸盐,同时联产高附加值的化工产品.本文提出采用低能耗的电解工艺利用氯化镁溶液矿化利用低浓度烟气CO2的新方法,该方法将氯化镁转化为活性较高的氢氧化镁,与不同浓度的CO2反应从而矿化CO2.该方法可以直接矿化浓度仅为20%的低浓度CO2,这使得直接矿化利用工业烟气CO2成为可能,避免了较高能耗的CO2捕捉提纯过程.另外,该方法可在较低的能耗下减排大量CO2,同时获取高附加值的碱式碳酸镁或三水合碳酸镁.由于氯化镁自然储量非常丰富,氯化镁矿化利用CO2具有大规模减排的潜力.

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