增强熔盐氧化的可持续性：废盐再利用和碳酸盐循环补充的热力学启示

发布时间：2025-04-10 03:49

使用土壤改良剂，如硅酸盐，可增强土壤的保水性和肥力。 #生活技巧# #园艺种植技巧# #土壤改良方法#

增强熔盐氧化的可持续性：废盐再利用和碳酸盐循环补充的热力学启示

Qingguo Zhang , Yongde Yan , Yun Xue , Fuqiu Ma , Guanqing Hu , Yuelin Wang , Jingping Wang , Milin Zhang

引用次数: 0

摘要

在高硫含量阳离子交换树脂（CER）的熔盐氧化（MSO）过程中，Li2CO3-Na2CO3-K2CO3 碳酸盐体系表现出卓越的截硫能力和热力学稳定性。然而，MSO 过程中产生的废盐无法再利用，无法降低运行成本并进一步提高还原率。因此，通过对 CERs 的 MSO 工艺进行热力学平衡分析，得出最佳处理氧当量为理论需氧量的 1.08 倍，并在本工作中给出了相应的近似化学式。以平衡分析结果为基础，提出了 MSO 工艺的补充循环（MSO-RC），通过补充消耗的碳酸盐来恢复废盐的二氧化硫吸附能力和处理能力。在实验过程中，MSO-RC 的氧化效率高于 99%，与传统 MSO 相比，体积减少率提高了 12%。此外，MSO-RC 通过在熔盐系统中添加成本效益高的 Na2CO3 和 K2CO3，可在多个循环中保持 80% 以上的硫截留率，并保留 94.7% 以上的 Li2CO3。MSO-RC 工艺显著提高了工艺运行效率，降低了运营成本。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

摘要图片

Enhancing molten salt oxidation sustainability: thermodynamic insights for spent salt reuse and carbonate cycle replenishment†

The Li2CO3–Na2CO3–K2CO3 carbonate system exhibits superior sulfur interception capacity and thermodynamic stability in the molten salt oxidation (MSO) of cation exchange resins (CERs) with high sulfur content. However, the spent salt from the MSO process cannot be reused to reduce the operating cost and further improve the reduction ratio. Therefore, the optimal oxygen equivalent for treatment is obtained by thermodynamic equilibrium analysis of the MSO process of CERs as 1.08 multiples of the theoretical oxygen demand and the corresponding approximate chemical formula in this work. The results of the equilibrium analysis are used as the basis to propose a replenishment cycle for the MSO process (MSO-RC), which replenishes the consumed carbonate to restore the SO2 adsorption capacity and treatment capacity of the spent salt. During the experiments, the oxidation efficiencies of MSO-RC are higher than 99%, and the volume reduction ratio is improved by 12% compared with the traditional MSO. In addition, the MSO-RC maintains sulfur interception rates above 80% across multiple cycles and preserves over 94.7% Li2CO3 by adding cost-effective Na2CO3 and K2CO3 into the molten salt system. The MSO-RC process significantly improves the efficiency of process operation with lower operational costs.

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来源期刊

Green Chemistry

CiteScore

16.10

自引率

7.10%

发文量

677

审稿时长

1.4 months

期刊介绍： Green Chemistry is a journal that provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998), which defines green chemistry as the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry aims to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. The journal welcomes submissions on all aspects of research relating to this endeavor and publishes original and significant cutting-edge research that is likely to be of wide general appeal. For a work to be published, it must present a significant advance in green chemistry, including a comparison with existing methods and a demonstration of advantages over those methods.

期刊最新文献

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