提锌二次尾渣制备微晶玻璃的工艺优化

回转窑法提锌是处理钢铁厂含锌粉尘的主要工艺，这一工艺会提取钢铁粉尘中锌等有价元素，同时也会排放大量的高温（1 200~1 300 ℃）二次尾渣。文中以该二次尾渣为研究对象，采用直接熔化、熔化还原除铁、高温(1 500 ℃)吹氧熔化和低温（1 200 ℃）吹氧熔化4种不同工艺获得熔渣，然后采用一步法工艺制备微晶玻璃。实验结果表明:采用熔化还原除铁工艺处理后的微晶玻璃有着最高的抗折强度（123.77 MPa）和吸水率（0.65%）；而采用低温吹氧熔化工艺具有最低的熔融能耗成本，所制备的微晶玻璃有着较好的抗折强度（64.48 MPa）和吸水率（0.48%）。热量平衡的进一步分析表明，在50%热利用效率条件下，吹氧温度不低于1 162 ℃，所放出热量足够使二次尾渣熔化。 

Process optimization of preparing glass-ceramic from secondary slag of zinc extraction

As a common method of dealing with dust with zinc in steel and iron plants,the Waelz process can recover zinc and other recycled materials from the dust from iron and steel industry,and produce a large amount of high temperature(1200~1300℃)secondary slag.In this paper,the secondary slag resulting from the extraction of zinc,as the research object,is treated by four different processes:direct smelting,smelting reduction and iron removal,melting by oxygen-blowing at high temperature(1500℃)and melting by oxygen-blowing at low temperature(1200℃),respectively,to prepare glass-ceramic by one-step process.These results showed that the glass-ceramics treated by the smelting and reduction process had the highest flexural strength(123.77 MPa)and water absorption(0.65%).Low temperature oxygen-blowing melting process cost the least melting energy and produced glass-ceramic with relatively high rupture strength(64.48 MPa)and water absorption(0.48%).Further analysis of the heat balance indicated that the heat released was enough to melt secondary slag on condition that oxygen was blown into the slag at temperatures not lower than 1162℃and the heat utilization efficiency was 50%.