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高校地质学报 ›› 2024, Vol. 30 ›› Issue (04): 476-484.DOI: 10.16108/j.issn1006-7493.2023034

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pH 摆动—钢渣矿化固碳工艺经济潜力评估

谢 奎,赵 良*,朱 辰,冯鹤男,孙佳佳,周伊杨   

  1. 南京大学 地球科学与工程学院,南京 210023
  • 出版日期:2024-08-20 发布日期:2024-08-20

pH Swing-Evaluation of Economic Potential of Mineralized Carbon Fixation Process of Steel Slag

XIE Kui,ZHAO Liang*,ZHU Chen,FENG Henan,SUN Jiajia,ZHOU Yiyang   

  1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
  • Online:2024-08-20 Published:2024-08-20

摘要: 基于CO2矿物封存的钢渣铵盐循环固碳工艺具有前景广阔的经济潜力和CO2减排效益,有助于帮助钢铁企业实现钢渣固废和含CO2烟气的废弃资源高价值综合利用。原料损失、反应时长、杂质离子行为直接影响工艺的运行成本与产品品质,最终决定其应用价值。文章通过小试实验研究对钢渣铵盐循环固碳工艺进行经济潜力评估,并从成本控制角度为工艺参数确定及优化方向提出建议。结果显示浸取液在10次循环过程中溶液新鲜度基本保持不变,造成的氯化铵损失的主要原因是溶液体积损失;沉淀过程CO2流速达到15~20 L/min时沉淀时间下降到20~30 min,此时沉淀过程不是工艺运行速率的限制因素;循环溶液中未见杂质离子明显富集,十轮反应的沉淀碳酸钙产品均符合行业标准;该工艺生产沉淀碳酸钙的CO2减排因子为1.543;该工艺吸收1吨CO2的利润为1325.25元,通过减少溶液损耗,利润可达1654.74元,具有显著的经济性。

Abstract: The CO2 mineral sequestration-based ammonium slag recycling carbon sequestration process has promising economic potential and CO2 emission reduction benefits, which can help steel companies achieve high-value comprehensive utilization of steel slag solid waste and waste resources containing CO2 flue gas. Raw material loss, reaction time and impurity ion behavior directly affect the operation cost and product quality of the process, and ultimately determine its application value. In this study, the economic potential of the steel slag ammonium salt recycling carbon fixation process was evaluated through laboratory scale test data, and suggestions were made for process parameter determination and optimization directions from the cost control perspective. The results show that the freshness of the solution remains basically unchanged during 10 cycles of leaching solution, and the main reason for the loss of raw materials is the loss of solution volume; the precipitation process CO2 flow rate reaches 15-20 L/min when the precipitation time drops to 20-30 min, at this time the precipitation process is not a limiting factor of the process operation rate; no obvious enrichment of impurity ions is seen in the circulating solution, and the precipitated calcium carbonate products of ten rounds of reactions are in line with industry standards; the CO2 reduction factor of this process to produce precipitated calcium carbonate is 1.543; the profit of this process to reduce 1 ton of CO2 is 1325.25 RMB, and the profit can reach 1654.74 RMB by reducing the solution loss, which has significant economy. 

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