Basic Oxygen Furnace slag contains heavy metals, including vanadium, chromium and molybdenum. The leachability of these elements determines the industrial applicability of slag-based building products. This study investigates the post‑carbonation leaching of heavy metals from activated BOF slag pastes with the focus on the activator dosage and type (sodium and potassium citrate). Results reveal that the high degree of brownmillerite hydration boosts the leachability of heavy metals as its hydration product- hydrogarnet is less stable upon carbonation. With two leaching procedures, it is demonstrated that the carbonation resistance of pastes becomes the main attribute in preventing the leaching of heavy metals. It can be enhanced by optimising the activator dosage to facilitate the hydration of C₂S and consequent structural densification.

碱性氧气炉渣含有重金属，包括钒、铬和钼。这些元素的可浸出性决定了矿渣基建筑产品的工业适用性。本研究调查了活化转炉渣浆中重金属的碳酸化后浸出，重点是活化剂的用量和类型（柠檬酸钠和柠檬酸钾）。结果表明，高度的褐铁矿水合提高了重金属的浸出性，因为其水合产物水石榴石在碳化时稳定性较差。通过两个浸出程序，证明了浆料的抗碳化能力成为防止重金属浸出的主要属性。可以通过优化活化剂用量来促进 C ₂的水合S 和随之而来的结构致密化。