Carbon dioxide mineralization for the disposition of blast‐furnace slag is an important method for reducing CO₂ emissions and simultaneously dealing with solid waste from the steel industry. However, due to the stable structures and properties of blast‐furnace slag, low mineralization reaction efficiency is a key issue in this process and hinders industrial applications. This work presents a method for enhancing the CO₂ mineralization reaction by the addition of salt solutions (e.g., NaCl 1 mol · L⁻¹) in the slurry of the blast‐furnace slag (<75 μm). The results showed that CO₂ mineralization efficiency could be greatly improved with a high CO₂ storage amount of ∼280 kg ${}_{{\mathrm{CO}}_2}$ · t_BFS⁻¹ at a liquid‐solid ratio (L/S ratio) of 10, a temperature of 150°C and CO₂ pressure of 3 MPa. The mineralization process was systematically characterized to identify the mechanism for mineralization enhancement by saline solution. The results indicated that saline solution could accelerate the dissolution of Ca²⁺ in blast‐furnace slag, reduce the activity of water, and lead to high acidity in the solution, and thus facilitate mineralization and improve the reaction rate. The NaCl solution was not consumed and could be recycled in the process, suggesting that this approach could use the brine and saline water as the medium for solid waste treatment and CO₂ emission reduction in high energy‐consuming industries such as mineral processing, power plants, and the steel industry. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

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用于处置高炉矿渣的二氧化碳矿化：使用NaCl溶液的反应强化

处理高炉矿渣的二氧化碳矿化是减少CO ₂排放并同时处理钢铁行业固体废物的重要方法。但是，由于高炉矿渣的结构和性能稳定，低矿化反应效率是该过程中的关键问题，并阻碍了工业应用。这项工作提出了一种通过在高炉矿渣（<75μm）的浆料中添加盐溶液（例如NaCl 1 mol·L ^-1）来增强CO ₂矿化反应的方法。结果表明，在高〜280 kg的CO ₂储存量下，CO _2的矿化效率可以大大提高。${}_{{\mathrm{一氧化碳}}_2}$ ·液固比（L / S比）为10，温度为150°C，CO ₂压力为3 MPa时的t _BFS ^-1。系统地表征了矿化过程，以确定盐溶液增强矿化的机理。结果表明，盐溶液可以促进Ca ²⁺在高炉渣中的溶解，降低水的活性，并导致溶液中的高酸度，从而促进矿化并提高反应速率。NaCl溶液没有消耗，可以在此过程中进行循环利用，这表明该方法可以使用盐水和盐水作为固体废物处理和CO ₂的介质矿物加工，发电厂和钢铁行业等高能耗行业的减排。©2018年化学工业协会和John Wiley＆Sons，Ltd.