随着我国矿山行业的快速发展,尾矿已成为产生量和堆存量最大的工业固废,且尾矿库存在引发环境风险的潜在威胁。为应对这些问题,本文研究了尾矿的资源化利用现状及其在“双碳”背景下通过CO2矿化实现固碳的潜力。实验以镁铁硅酸盐型尾矿...随着我国矿山行业的快速发展,尾矿已成为产生量和堆存量最大的工业固废,且尾矿库存在引发环境风险的潜在威胁。为应对这些问题,本文研究了尾矿的资源化利用现状及其在“双碳”背景下通过CO2矿化实现固碳的潜力。实验以镁铁硅酸盐型尾矿为对象,探讨了矿化反应过程中的pH变化、矿化产物的生成及其对尾矿稳定性的影响。结果表明,尾矿矿化固定CO2的技术具有良好的可行性,并能有效提高尾矿库的结构稳定性。此外,本文提出了一种基于CO2矿化的尾矿库强化治理方案,设计了尾矿库现场矿化系统,验证了其在大规模固碳应用中的潜力。研究表明,通过矿山固废的CO2矿化利用,既能减少环境风险,又能为实现碳减排目标提供新的路径,具有显著的环境和经济效益。With the rapid development of my country’s mining industry, tailings have become the largest industrial solid waste in terms of production and stockpiling, and tailings ponds pose a potential threat to environmental risks. To address these issues, this paper studies the current status of tailings resource utilization and its potential for carbon fixation through CO2 mineralization under the background of “dual carbon”. The experiment took magnesium-iron silicate tailings as the object, and explored the pH changes during the mineralization reaction, the generation of mineralization products and their effects on the stability of tailings. The results show that the technology of CO2 fixation by tailings mineralization has good feasibility and can effectively improve the structural stability of the tailings pond. In addition, this paper proposes a tailings pond enhancement management scheme based on CO2 mineralization, designs an on-site mineralization system for tailings ponds, and verifies its potential in large-scale carbon fixation applications. Research shows that the utilization of CO2 mineralization from mining solid waste can not only reduce environmental risks, but also provide a new path to achieve carbon emission reduction goals, with significant environmental and economic benefits.展开更多
为改善镁合表面高温氧化膜性能,采用CO_(2)矿化技术对AZ80-0.38Nd(质量分数/%,下同)合金表面高温氧化膜进行了处理。对比考察了合金氧化膜CO_(2)矿化处理前后的微观形貌、结构及物相,并采用浸泡和电化学测试技术研究了膜层的腐蚀防护性...为改善镁合表面高温氧化膜性能,采用CO_(2)矿化技术对AZ80-0.38Nd(质量分数/%,下同)合金表面高温氧化膜进行了处理。对比考察了合金氧化膜CO_(2)矿化处理前后的微观形貌、结构及物相,并采用浸泡和电化学测试技术研究了膜层的腐蚀防护性能。结果表明,AZ80-0.38Nd合金表面高温氧化膜具有典型的裂纹与孔洞缺陷,CO_(2)矿化处理很好地修复了合金表面高温氧化膜缺陷,提高了氧化膜层的致密度,并在合金表面构筑由棒状MgCO_(3)·3H_(2)O和层片状4MgCO_(3)·Mg(OH)2·4H 2O组成的矿化膜。相比于氧化膜,矿化膜可将合金自腐蚀电位(E corr)由-1.41 V SCE提高至-1.33 V SCE,将合金自腐蚀电流密度(i corr)由1.62×10^(-4)A/cm^(2)减小至2.47×10^(-5)A/cm^(2)。此外,矿化膜还能将合金局部腐蚀转变为均匀腐蚀,呈现优异的腐蚀防护性能。展开更多
文章介绍了我国CCS及CCUS的基本情况,并对其发展过程中存在的主要困难与问题进行了分析,鉴于CO2地质封存可能成为CCS或CCUS技术发展的主要障碍,作者提出了在我国实现大规模CO2矿化利用的CCU(CO2 capture and utilization)发展新理念,选...文章介绍了我国CCS及CCUS的基本情况,并对其发展过程中存在的主要困难与问题进行了分析,鉴于CO2地质封存可能成为CCS或CCUS技术发展的主要障碍,作者提出了在我国实现大规模CO2矿化利用的CCU(CO2 capture and utilization)发展新理念,选取了可参考的三条CCU技术发展路线,即利用氯化镁矿化CO2联产盐酸和碳酸镁技术路线、固废磷石膏矿化CO2联产硫基复合肥技术路线和利用钾长石矿化利用CO2的技术路线。文章最后就如何在我国发展和部署CCU技术路线方案提出了若干建议。展开更多
文摘随着我国矿山行业的快速发展,尾矿已成为产生量和堆存量最大的工业固废,且尾矿库存在引发环境风险的潜在威胁。为应对这些问题,本文研究了尾矿的资源化利用现状及其在“双碳”背景下通过CO2矿化实现固碳的潜力。实验以镁铁硅酸盐型尾矿为对象,探讨了矿化反应过程中的pH变化、矿化产物的生成及其对尾矿稳定性的影响。结果表明,尾矿矿化固定CO2的技术具有良好的可行性,并能有效提高尾矿库的结构稳定性。此外,本文提出了一种基于CO2矿化的尾矿库强化治理方案,设计了尾矿库现场矿化系统,验证了其在大规模固碳应用中的潜力。研究表明,通过矿山固废的CO2矿化利用,既能减少环境风险,又能为实现碳减排目标提供新的路径,具有显著的环境和经济效益。With the rapid development of my country’s mining industry, tailings have become the largest industrial solid waste in terms of production and stockpiling, and tailings ponds pose a potential threat to environmental risks. To address these issues, this paper studies the current status of tailings resource utilization and its potential for carbon fixation through CO2 mineralization under the background of “dual carbon”. The experiment took magnesium-iron silicate tailings as the object, and explored the pH changes during the mineralization reaction, the generation of mineralization products and their effects on the stability of tailings. The results show that the technology of CO2 fixation by tailings mineralization has good feasibility and can effectively improve the structural stability of the tailings pond. In addition, this paper proposes a tailings pond enhancement management scheme based on CO2 mineralization, designs an on-site mineralization system for tailings ponds, and verifies its potential in large-scale carbon fixation applications. Research shows that the utilization of CO2 mineralization from mining solid waste can not only reduce environmental risks, but also provide a new path to achieve carbon emission reduction goals, with significant environmental and economic benefits.
文摘为改善镁合表面高温氧化膜性能,采用CO_(2)矿化技术对AZ80-0.38Nd(质量分数/%,下同)合金表面高温氧化膜进行了处理。对比考察了合金氧化膜CO_(2)矿化处理前后的微观形貌、结构及物相,并采用浸泡和电化学测试技术研究了膜层的腐蚀防护性能。结果表明,AZ80-0.38Nd合金表面高温氧化膜具有典型的裂纹与孔洞缺陷,CO_(2)矿化处理很好地修复了合金表面高温氧化膜缺陷,提高了氧化膜层的致密度,并在合金表面构筑由棒状MgCO_(3)·3H_(2)O和层片状4MgCO_(3)·Mg(OH)2·4H 2O组成的矿化膜。相比于氧化膜,矿化膜可将合金自腐蚀电位(E corr)由-1.41 V SCE提高至-1.33 V SCE,将合金自腐蚀电流密度(i corr)由1.62×10^(-4)A/cm^(2)减小至2.47×10^(-5)A/cm^(2)。此外,矿化膜还能将合金局部腐蚀转变为均匀腐蚀,呈现优异的腐蚀防护性能。
基金National Engineering Laboratory for Green Chemical Productions of Alcohols,Ethers and Esters and State Key Laboratory for Physical Chemistry of Solid Surface of Xiamen University
文摘文章介绍了我国CCS及CCUS的基本情况,并对其发展过程中存在的主要困难与问题进行了分析,鉴于CO2地质封存可能成为CCS或CCUS技术发展的主要障碍,作者提出了在我国实现大规模CO2矿化利用的CCU(CO2 capture and utilization)发展新理念,选取了可参考的三条CCU技术发展路线,即利用氯化镁矿化CO2联产盐酸和碳酸镁技术路线、固废磷石膏矿化CO2联产硫基复合肥技术路线和利用钾长石矿化利用CO2的技术路线。文章最后就如何在我国发展和部署CCU技术路线方案提出了若干建议。
