Graduate Institute of Environmental Engineering, National Taiwan University , 71 Chou-Shan Road, Da-an District, Taipei City, 10673 Taiwan (R.O.C.).
Department of Chemical Engineering and Biotechnology, National Taipei University of Technology , No. 1, Section 3, Zhongxiao E Road, Taipei City, Taiwan 10608, Taiwan (R.O.C.).
Environ Sci Technol. 2015 Oct 20;49(20):12380-7. doi: 10.1021/acs.est.5b02210. Epub 2015 Oct 2.
The high-gravity carbonation process for CO2 mineralization and product utilization as a green cement was evaluated using field operation data from the steelmaking industry. The effect of key operating factors, including rotation speed, liquid-to-solid ratio, gas flow rate, and slurry flow rate, on CO2 removal efficiency was studied. The results indicated that a maximal CO2 removal of 97.3% was achieved using basic oxygen furnace slag at a gas-to-slurry ratio of 40, with a capture capacity of 165 kg of CO2 per day. In addition, the product with different carbonation conversions (i.e., 0%, 17%, and 48%) was used as supplementary cementitious materials in blended cement at various substitution ratios (i.e., 0%, 10%, and 20%). The performance of the blended cement mortar, including physicochemical properties, morphology, mineralogy, compressive strength, and autoclave soundness, was evaluated. The results indicated that the mortar with a high carbonation conversion of slag exhibited a higher mechanical strength in the early stage than pure portland cement mortar, suggesting its suitability for use as a high early strength cement. It also possessed superior soundness compared to the mortar using fresh slag. Furthermore, the optimal operating conditions of the high-gravity carbonation were determined by response surface models for maximizing CO2 removal efficiency and minimizing energy consumption.
采用炼钢行业的现场运行数据，评估了 CO2 矿化和产品利用的高重力碳酸化工艺，作为一种绿色水泥。研究了关键操作因素，包括转速、液固比、气体流量和浆液流量对 CO2 去除效率的影响。结果表明，在气浆比为 40 的情况下，使用碱性氧气炉渣可实现最大 97.3%的 CO2 去除率，每天的捕集能力为 165 千克 CO2。此外，不同碳酸化转化率（即 0%、17%和 48%）的产品用作掺合水泥中的辅助胶凝材料，替代比为 0%、10%和 20%。评估了掺合水泥砂浆的性能，包括物理化学性质、形态、矿物学、抗压强度和蒸压稳定性。结果表明，具有高碳酸化转化率的渣水泥砂浆在早期表现出比纯波特兰水泥砂浆更高的机械强度，表明其适合用作高早强水泥。与使用新鲜渣的砂浆相比，它还具有更好的稳定性。此外，通过响应面模型确定了高重力碳酸化的最佳操作条件，以最大程度地提高 CO2 去除效率和最小化能源消耗。
