基于盐湖镁渣和工业固体废弃物的氧氯化镁水泥的固碳行为

Yuanrui Li , Baolan Li , Weixin Zheng , Jin Zhou , Jing Wen , Jinmei Dong , Chenggong Chang , Qiang Wang
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摘要

随着锂离子电池在电动汽车和储能领域的广泛应用,锂的消耗量急剧增加。锂资源产地面临着越来越大的环境压力,尤其是锂提取过程中产生的镁渣(MR),可持续开发利用的途径尚未建立。在 "净零 "框架下,镁渣被转化为盐湖氧化镁(SL-MgO),并通过各种元素和表面分析方法对其进行表征。氧氯化镁水泥(MOC)由盐湖氧化镁和两种工业固体废物(粉煤灰(FA)和磷石膏(PG))制备而成,并对其固碳能力进行了分析和评估。如果锂提取过程中产生的所有 MR 都用于制造用于二氧化碳封存的 MOC 材料。当 PG 含量为 20% 时,MOC 的二氧化碳封存能力为 0.29 kg/m2,抗压强度为 85.30 MPa,中和了锂提取过程中 220.10% 的二氧化碳排放量。在这一过程中,还发现了可识别的典型可转移碳酸盐产物。总之,利用 MRs 和工业固体废弃物制造新型低碳 MOC 可能成为缓解这些地区环境压力的最直接、最有效的对策。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Carbon sequestration behavior of magnesium oxychloride cement based on salt lakes magnesium residue and industrial solid waste

With the extensive utilization of lithium-ion battery in the electric vehicle and energy storage field, the consumption of lithium has been sharply increasing. Lithium resource occurrence area were facing increasing environmental pressure, particularly the magnesium residue (MR) produced in the lithium extraction process, and a sustainable exploitation pathway have not been established. In the framework of "net-zero", MRs were onverted to Salt lake magnesium oxide (SL-MgO) which was characterized by various elemental and surface analysis methods. Magnesium oxychloride cement (MOC) was prepared form SL-MgO and two industrial solid wastes [fly ash (FA) and phosphogypsum (PG)], and its carbon sequestration capacity was analyzed and evaluated. If all the MRs produced from the lithium extraction process were used to manufacture MOC materials for CO2 sequestration. When the PG content was 20 %, the CO2 sequestration capacity of the MOC was 0.29 kg/m2, the compressive strength was 85.30 MPa, and the MOC neutralized 220.10 % of the CO2 emissions from the lithium extraction process. In this procedure, evidence was found of the typical metastable carbonate products identifiable. Overall, utilizing MRs and industrial solid waste to manufacture new low-carbon MOCs may become the most direct and effective countermeasures to alleviate environmental pressure in these regions.

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