低碳化学与化工2025，Vol.50Issue(7)：72-82,11.DOI:10.12434/j.issn.2097-2547.20240302
两阶VPSA分离锂精矿焙烧窑炉尾气CO2工艺模拟
Simulation of two-stage VPSA separation of CO2 from lithium concentrate roasting kiln exhaust gas
摘要
Abstract
The application of pressure swing adsorption(PSA)to extract CO2 from the exhaust gas of lithium ore roasting(natural gas)furnaces and employ it as a carbonization feedstock in the production of lithium carbonate from spodumene has garnered extensive interest.Considering the low CO2 concentration and elevated temperature characteristics of the exhaust gas,a two-stage vacuum pressure swing adsorption(VPSA)process was specifically designed,and the process was simulated using Aspen Adsorption software.The results show that using 13X zeolite as the adsorbent under feed gas(roasting kiln exhaust gas)temperature of 373.15 K,regeneration pressure of 5 kPa,and CO2 volume fraction of 9％,CO2 is enriched to the volume fraction of 65.88％by the first-stage VPSA,and then purified to the volume fraction of 95.31％by the second-stage VPSA,achieving a total CO2 recovery rate of 92.20％.By recycling the exhaust gas from the adsorption phase of the second-stage VPSA into the first-stage feed,the total CO2 recovery rate increases to 95.20％.The CO2 purity(>95％)meets stringent requirements for battery-grade lithium carbonate production via carbonation.This study can provide a theoretical foundation for CO2 separation and resource utilization from roasting kiln exhaust gas.关键词
锂精矿焙烧窑炉尾气/CO2/VPSA/工艺模拟/13X分子筛Key words
lithium concentrate roasting kiln exhaust gas/CO2/VPSA/process simulation/13X zeolite分类
化学化工引用本文复制引用
张林,王镜霖,崔群,王海燕,马正飞..两阶VPSA分离锂精矿焙烧窑炉尾气CO2工艺模拟[J].低碳化学与化工,2025,50(7):72-82,11.基金项目
国家重点研发计划(2021YFC2103900). （2021YFC2103900）
