激冷水合改性镁渣脱硫剂性能实验

为了达到以废治废的目的，对镁冶炼产生的废弃物-镁还原渣通过激冷水合方式制备脱硫剂进行研究。采用XRD获得不同激冷条件下样品的物质组成，通过SEM研究炽热镁渣激冷样品的表观形貌。通过实验室激冷水合实验研究不同水合参数对水合反应以及脱硫性能的影响。对比现场炽热镁渣激冷水合与实验室激冷水合活化方式下水合样品的脱硫性能。结果表明：镁渣激冷后的主要成分为β-C2S，且表面变得粗糙多孔；脱硫钙转化率与水合反应程度间存在抛物线关系；当激冷温度为950℃，水合温度为50℃，实验室炽热镁渣激冷水合反应所制备的脱硫剂在水合时间为6 h时，钙转化率最高，为14.1%，而水合时间为8 h时，水合反应程度最大，为0.16 g·g-1；与实验室炽热镁渣激冷水合样品和自然冷却水合样品相比，现场炽热镁渣激冷水合样品的钙转化率最高，达30.33%。

Experiment on desulfurization performance of magnesium slag modified by quenching hydration

In order to attain the purpose of treating waste with waste, the waste magnesium reducing slag left from magnesium smelting was used for desulfurization by hydration of quenching magnesium slag. The material composition and apparent morphology of different quenching samples were analyzed by XRD and SEM. The effects of different hydration parameters on hydration and desulfurization performance were studied under laboratory conditions. The desulfurization performance of samples of quenching magnesium slag in the field and in the laboratory, were compared. The results showed that the main component of magnesium slag was β-C2S and that its morphology was a rough, pore-rich surface after quenching. There was a parabolic relationship between the degree of hydration and the calcium conversion rate. When the quenching temperature and hydration temperature was 950℃ and 50℃, respectively, under laboratory conditions, the highest calcium conversion rate was 14.1% with hydration time of 6 h, and the highest hydration degree was 0.16 g·g-1 with hydration time of 8 h. The calcium conversion rate of the hydration sample in the field experiment was 30.33%, which was higher than in the laboratory experiment.