碱性氧气炉渣浸出-碳化合成高纯稳定的球霰石,ACS Sustainable Chemistry & Engineering

当前位置： X-MOL 学术 › ACS Sustain. Chem. Eng. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

碱性氧气炉渣浸出-碳化合成高纯稳定的球霰石
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2024-02-29 , DOI: 10.1021/acssuschemeng.3c07375
Qifeng Song ₁ , Ming-Zhi Guo ₂ , Tung-Chai Ling ₁

Affiliation

针对碱性氧气炉渣（BOFS）间接碳化生产的沉淀碳酸钙工业应用有限、附加值低的背景，本研究提出了一种简单的方法（利用氯化铵（NH 4 Cl）从BOFS中_提取Ca ²⁺）并随后优化水相碳酸化工艺）以合成具有更高附加值的高纯度球霰石。研究了提高Ca ²⁺浸出效率和最大化碳化封存CO _{2的影响因素。}在很短的时间（10分钟）内，Ca ²⁺浸出率达到60.3%，而通过添加NH ₄ OH获得99.5%的碳化率，产生高纯度（98%）的均质球霰石。使用氨精制溶液的碱性pH值（~10.6）以获得更高的CO ₃^2- /Ca ²⁺比率和溶液过饱和度以刺激球霰石成核。NH ₄⁺和来自BOFS的金属阳离子在球霰石表面的吸附起到结晶控制剂的作用，抑制球霰石向方解石的转变。此外，碳酸化滤液可循环利用至少六次，萃取-碳酸化效率持续超过 60%，同时保持球霰石晶体完整性。固体残渣主要由硅胶和惰性可还原氧化物（RO）相组成，由于其火山灰性质，可用作潜在的补充胶凝材料。这项研究的结果为 BOFS 的价值评估提供了新的见解，以减少 CO ₂排放并促进 BOFS 间接碳酸化工艺的可持续工业应用。

"点击查看英文标题和摘要"

Synthesis of High-Purity and Stable Vaterite Via Leaching–Carbonation of Basic Oxygen Furnace Slag

Against the backdrop of the limited industrial application and low added value of precipitated calcium carbonate produced through the indirect carbonation of basic oxygen furnace slag (BOFS), this study proposed a simple approach (extracting Ca²⁺ from BOFS using ammonium chloride (NH₄Cl) and subsequently optimizing the aqueous carbonation process) for synthesizing high-purity vaterite with greater added value. The influencing factors in the enhancement of Ca²⁺ leaching efficiency and maximization of carbonation to sequester CO₂ were studied. Within a very short time (10 min), a Ca²⁺ leaching ratio of 60.3% was achieved, while a 99.5% carbonation ratio was attained by adding NH₄OH to produce high-purity (98%) homogeneous vaterite. The alkaline pH (∼10.6) of the solution was refined using ammonia to achieve a higher CO₃^2–/Ca²⁺ ratio and solution supersaturation for the stimulation of vaterite nucleation. The adsorption of NH₄⁺ and metal cations from BOFS on the surface of vaterite acted as a crystalline control agent to inhibit the transformation of vaterite into calcite. In addition, the carbonation filtrate can be recycled at least six times with a sustained extraction-carbonation efficiency of over 60% while maintaining the vaterite crystalline integrity. The solid residue was mainly composed of silica gel and inert reducible oxide (RO) phase, which can be used as a potential supplementary cementitious material due to its pozzolanic properties. Findings from this study provide new insights into the valorization of BOFS to mitigate CO₂ emissions and promote the sustainable industrial application of the BOFS indirect carbonation process.

更新日期：2024-02-29

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南