以环氧氯丙烷(ECH)生产过程的皂化废渣和CO₂为主要耗材,通过铵盐浸取反应、CO₂碳化反应、煅烧反应等工艺步聚,就可以得到绿色高纯轻质碳酸钙、绿色轻质MgO 2个高附加值产品,同时实现皂化废渣的资源化、无害化、减量化和CO₂永久固定的目标。如果采用复合碳化新工艺还可得到纳米级高纯轻质碳酸钙。皂化废渣减量化的关键技术在于采用高比表面积氢氧化钙取代普通氢氧化钙来减少过剩系数,并严格控制其中镁、铁、铝、硅等元素含量,从源头上实现皂化废渣的减量化和降低生产成本的目标。在双碳新时代,这种兼具环境效益、社会效益和经济效益的循环经济项目新技术值得重视与推广。

Taking the saponification waste residue from the epichlorohydrin (ECH) production process and CO₂ as the main raw materials,green high-purity light calcium carbonate and green light MgO can be obtained through the processes such as ammonium salt leaching reaction,CO₂ carbonation reaction,and calcination reaction.The re-utilization,harmless treatment,and reduction of the saponification waste residue are therefore achieved,and the permanent fixation of CO₂ can be realized.If a novel composite carbonization process is adopted,nano-scale high-purity light calcium carbonate can also be obtained.The key technology for reducing the amount of saponification waste residue lies in using calcium hydroxide with a high specific surface area to replace ordinary calcium hydroxide to reduce the excess coefficient,and strictly controlling the content of elements such as magnesium,iron,aluminum,and silicon in residue,thereby achieving the goals that reduces the amount of saponification waste residue and lowers production cost from the source.In the new era of “carbon dioxide emission peaking and carbon neutrality”,this circular economy project new technology that combines environmental benefits,social benefits,and economic benefits deserves attention and promotion.