CO_(2) mineralization of carbide slag for the production of light calcium carbonates  

作　　者：Tongyang Zhang Guanrun Chu Junlin Lyu Yongda Cao Wentao Xu Kui Ma Lei Song Hairong Yue Bin Liang 

机构地区：[1]Low Carbon Technology and Chemical Reaction Engineering Laboratory,School of Chemical Engineering,Sichuan University,Chengdu 610065,China [2]Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu 610207,China

出　　处：《Chinese Journal of Chemical Engineering》2022年第3期86-98,共13页中国化学工程学报（英文版）

基　　金：the support from National Natural Science Foundation of China(22078208);the Major Science and Technology Projects of Inner Mongolia Autonomous Region(2020ZD0025);China Chengda Engineering Co.,Ltd.for its software support。

摘　　要：The production of polyvinyl chloride by calcium carbide method is a typical chemical process with high coal consumption,leading to massive flue gas and carbide slag emissions.Currently,the carbide slag with high CaO content is usually stacked in residue field,easily draining away with the rain and corroding the soil.In this work,we coupled the treatment of flue gas and carbide slag to propose a facile CO_(2)mineralization route to prepare light calcium carbonate.And the route feasibility was comprehensively evaluated via experiments and simulation.Through experimental investigation,the Ca^(2+) leaching and mineralization reaction parameters were determined.Based on the experiment,a process was built and optimized through Aspen Plus,and the energy was integrated to obtain the overall process energy and material consumption.Finally,the net CO_(2)emission reduction rate of the entire process through the life-cycle assessment method was analyzed.Moreover,the relationship between the parameters and the CO_(2)emission life-cycle assessment was established.The final optimization results showed that the mineralization process required 1154.69 kW·h·(t CO_(2))^(-1) of energy(including heat energy of 979.32 kW·h·(t CO_(2))^(-1) and electrical energy of 175.37 kW·h·(t CO_(2))^(-1)),and the net CO_(2)emission reduction rate was 35.8%.The light CaCO_(3)product can be sold as a high value-added product.According to preliminary economic analysis,the profit of mineralizing can reach more than 2,100 CNY·(t CO_(2))^(-1).

关 键 词：CO_(2)mineralization Calcium carbide slag Light calcium carbonate Process simulation Life-cycle assessment 

分 类 号：TQ132.32[化学工程—无机化工] X701[环境科学与工程—环境工程]