Simulation of two-stage VPSA separation of CO<sub>2</sub> from lithium concentrate roasting kiln exhaust gas

ZHANG Lin; WANG Jinglin; CUI Qun; WANG Haiyan; MA Zhengfei

doi:10.12434/j.issn.2097-2547.20240302

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Simulation of two-stage VPSA separation of CO₂ from lithium concentrate roasting kiln exhaust gas

更新时间：2025-07-30

- Simulation of two-stage VPSA separation of CO₂ from lithium concentrate roasting kiln exhaust gas
- Vol. 50, Issue 7, Pages: 72-82(2025)
- 作者机构：
  
  南京工业大学化工学院，江苏南京 211816
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20240302
  CLC： TQ028
- Received：17 July 2024，
  
  Revised：24 April 2025，
  
  Published：25 July 2025
- 稿件说明：
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张林,王镜霖,崔群等.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.

ZHANG Lin,WANG Jinglin,CUI Qun,et al.Simulation of two-stage VPSA separation of CO₂ from lithium concentrate roasting kiln exhaust gas[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(7):72-82.
张林,王镜霖,崔群等.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. DOI： 10.12434/j.issn.2097-2547.20240302.

ZHANG Lin,WANG Jinglin,CUI Qun,et al.Simulation of two-stage VPSA separation of CO₂ from lithium concentrate roasting kiln exhaust gas[J].Low-Carbon Chemistry and Chemical Engineering,2025,50(7):72-82. DOI： 10.12434/j.issn.2097-2547.20240302.

摘要

采用变压吸附分离锂精矿焙烧（天然气）窑炉尾气中CO

，以作为锂辉石生产碳酸锂的碳化原料受到广泛关注。针对该窑炉尾气CO

含量较低和温度较高的特点，设计了两阶真空变压吸附（VPSA）分离CO

工艺，采用Aspen Adsorption软件模拟了该工艺过程。结果表明，以13X分子筛为吸附剂，在进料（窑炉尾气）温度373.15 K、再生压力5 kPa和CO

体积分数9%的条件下，由第一阶VPSA将CO

富集到体积分数为65.88%，再进入第二阶VPSA提纯CO

至体积分数为95.31%，CO

总回收率为92.20%；将第二阶VPSA吸附阶段的出塔气回流并入第一阶VPSA进料，CO

总回收率提高至95.20%。两阶VPSA从窑炉尾气中分离CO

纯度（

95%）满足锂精矿生产电池级碳酸锂的碳化工艺要求。本研究可为天然气窑炉尾气CO

分离及资源化利用提供理论基础。

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 CO

concentration and elevated temperature characteristics of the exhaust gas

a two-stage vacuum pressure swing adsorption (VPSA) proc

ess 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 CO

volume fraction of 9%

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 CO

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 CO

recovery rate increases to 95.20%. The CO

purity (

95%) meets stringent requirements for battery-grade lithium carbonate production via carbonation. This study can provide a theoretical foundation for CO

separation and resource utilization from roasting kiln exhaust gas.

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references

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Simulation of two-stage VPSA separation of CO2 from lithium concentrate roasting kiln exhaust gas

DOI：10.12434/j.issn.2097-2547.20240302

摘要

Abstract

关键词

Keywords

references

Simulation of two-stage VPSA separation of CO₂ from lithium concentrate roasting kiln exhaust gas