CO2 Sequestration by Carbonation Processes of Rubblized Concrete at Standard Conditions and the Related Mineral Stability Diagrams,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.)

CO2 Sequestration by Carbonation Processes of Rubblized Concrete at Standard Conditions and the Related Mineral Stability Diagrams
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-04-07 , DOI: 10.1021/acssuschemeng.9b07690
Aiyoub Abbaspour ₁ , Burak F. Tanyu ₁

Affiliation

A study is conducted to evaluate the carbonation processes from rubblized concrete (RC) as it relates to CO₂ sequestration and carbon life cycle analyses for cement and concrete industries. In a one-year time frame, this study demonstrated that, during direct carbonation, RC absorbs up to 56 mg/g of CO₂ when pretreated (suitable for mineral carbonation technology - MCT) and 19 mg/g of CO₂ when unprocessed (suitable to create RC beds). RC is also found to be able to absorb CO₂ during the indirect carbonation process of MCT (including high ionic strength (IS ≈ 0.1 to 0.5 M) and CO₂ injection into solution). This condition results in r = Ca²⁺/SO₄^2– ≈ 1, which favors the precipitation of calcite. However, when RC is treated as a bed of material, the indirect process does not appear to favor the CO₂ absorption as the solution becomes low ionic strength (IS ≈ 0.06 M) and the r values stay close to unity for the entire carbonation process (resulting in gypsum precipitation). As part of the indirect carbonation evaluation from RC, a set of mineral stability diagrams and a Ca–CO₃^2––SO₄^2––H₂O equilibrium system was developed that can provide an accurate prediction of the coexisting minerals from the RC solution.

中文翻译：

标准条件下碳化混凝土碳化过程中的CO ₂固存及相关矿物稳定性图

进行了一项研究，以评估碎石混凝土（RC）的碳化过程，该过程与水泥和混凝土行业的CO ₂固存和碳生命周期分析有关。在一年的时间范围内，这项研究表明，在直接碳酸化过程中，RC进行预处理（适用于矿物碳酸化技术-MCT）时吸收高达56 mg / g的CO ₂，而未经处理时吸收19 mg / g的CO ₂（适合创建RC床）。还发现RC在MCT的间接碳酸化过程中（包括高离子强度（IS≈0.1至0.5 M）和向溶液中注入CO ₂）能够吸收CO ₂。这种情况导致r = Ca ²⁺ / SO ₄² –≈1，有利于方解石的沉淀。但是，当将RC视为材料床时，由于溶液的离子强度变低（IS≈0.06 M），并且整个碳化过程中r值保持接近统一，因此间接过程似乎不利于CO _2的吸收。（导致石膏沉淀）。作为RC间接碳酸盐化评估的一部分，开发了一套矿物稳定性图和Ca–CO ₃^2–– SO ₄^2–– H ₂ O平衡系统，可以准确预测RC中共存的矿物。解。

更新日期：2020-04-07

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11