有色金属科学与工程2025，Vol.16Issue(1)：25-34,10.DOI:10.13264/j.cnki.ysjskx.2025.01.004
含钙镁渣液离子膜碳化电解制备CaCO3
Preparation of calcium carbonate by ion-exchange membrane carbonization electrolysis of calcium-containing magnesium slag solution
摘要
Abstract
Magnesium slag is a solid waste produced by Pidgeon process.It is found that there are a large number of CaO and Ca2SiO4 phases in magnesium slag,which is a good calcium source.The concentration of CaCl2 solution obtained by adding hydrochloric acid to leach magnesium slag is about 250 g/L,and then converted into Ca(OH)2 solution by electrolysis.Light CaCO3 products can be prepared by introducing CO2 into the cathode of the electrolytic cell.Therefore,in this paper,using 250 g/L CaCl2 solution as the anode liquid,CaCO3 product was obtained by cation exchange membrane electrolysis technology and CO2 was introduced at the cathode.The effects of various factors on the electrolysis process were investigated by changing the cathode NaCl concentration,CO2 flow rate,current density and electrolysis time.The results show that the electrolysis effect is the best when the experimental conditions are cathode NaCl concentration of 50 g/L,CO2 flow rate of 50 mL/min,current density of 0.05 A/cm2 and electrolysis time of 2 h.At this time,the mass of CaCO3 product was 4.41 g,and the energy consumption per unit mass of electrolysis process was 2.79 kW·h/kg.Compared with direct electrolysis to obtain Ca(OH)2,it was found that direct electrolysis had obvious mass loss and increased energy consumption,so it was necessary to introduce CO2 into the cathode during the electrolysis process.关键词
镁渣/阳离子交换膜/电解/Ca(OH)2/CaCO3Key words
magnesium slag/cation exchange membrane/electrolysis/Ca(OH)2/CaCO3分类
冶金工业引用本文复制引用
李广涛,刘燕,张廷安,林胜男..含钙镁渣液离子膜碳化电解制备CaCO3[J].有色金属科学与工程,2025,16(1):25-34,10.基金项目
中国博士后科学基金第16批特别资助(站中)项目(2023T160088) （站中）
国家自然科学基金青年基金资助项目(52304324) （52304324）
