利用铁尾矿制备微晶泡沫玻璃的热处理工艺研究

以商洛某尾矿库现存铁尾矿为主要原料，以废玻璃为增硅剂，CaCO₃为发泡剂，TiO₂和CaF₂作为复合晶核剂，采用粉末法二次烧结法制备微晶泡沫玻璃，研究了发泡工艺和微晶化工艺对其抗压强度、密度以及热导率的影响。结果表明:在1 350℃、保温2 h条件下获得了最佳熔制效果的基础玻璃；铁尾矿掺入质量分数为40%，在900℃时发泡30 min、1 120℃微晶化处理2 h后，制得了孔径尺寸为1.6~2.0 mm、表观密度为1.679 g·cm-3、抗压强度27.22 MPa、热导率为0.107 W·（m·K）-1的微晶泡沫玻璃。 

Research on Heat Treatment Process of Foam Glass-ceramics From Iron Tailings

The foam glass-ceramics were prepared by sintering method using the iron tailings from a tailings pond in Shangluo area as the main raw material, waste glass as silicatization agent, calcium carbonate as foaming agent, titanium dioxide and calcium fluoride as composite crystal nucleating agents. The effects of key parameters in foaming and microcrystallization process on its compressive strength, density and thermal conductivity were discussed. Results showed that when the content of iron tailings is 40%, foamed for 30 min at 900 ℃ and then crystallized at 1150 ℃ for 2 h, the high-strength foam glass ceramics was prepared with average pore diameter of 1.6~2.0 mm, the apparent density of 1.679 g·cm-3, the compressive strength of 27.22 MPa and the thermal conductivity of 0.107 W/(m·k).