利用选钛尾矿制备微晶泡沫玻璃及其性能研究

Study on Preparation and Performances of Microcrystalline Foam Glass from Titanium Tailings

利用攀枝花选钛尾矿为主要原料,添加硼砂助熔剂经熔融、水淬、发泡、微晶、退火等系列工艺制备出微晶泡沫玻璃。研究了发泡剂种类、用量及稳泡剂用量、发泡时间、发泡温度、微晶化温度及时间等因素对微晶泡沫玻璃的表观密度、抗压强度和吸水率的影响。并通过SEM扫描分析制备的试样,内部出现充满连通且封闭的不规则气泡,孔壁较厚,体积膨胀明显的多孔状结构。研究结果表明:当发泡剂CaCO_3的添加量为2%,稳泡剂Na_3PO_4·12H_2O的添加量为5%时,在发泡温度840℃时发泡20 min,550℃微晶化处理90 min后可以制备孔径1.8~2.2 mm,表观密度1.31g/cm^3,抗压强度16.7 MPa,吸水率为11.3%的微晶泡沫玻璃。

Using Panzhihua ilmenite tailings as raw materials and borax as fluxing reagent, the microcrystal- line foam glass was prepared successively through melting, annealing processes. The effects of foaming agent species water quenching, foaming, microcrystallization and and amount, foam stabilizer amount, foaming tern- perature and time, microcrystallization temperature and time, on the apparent density, compressive strength and water absorption of the obtained microcrystalline foam glass were investigated. From SEM of the prepared microcrystalline foam glass, it presents an inflated porous structure with interconnected closed-irregular bub- bles in the interior. It is shown that the microcrystalline foam glass having 1.8 - 2.2 mm of pore diameter, 1.31 g/cm3 of apparent density, 16.7 MPa of compressive strength and 11.3% of water absorption can be ob- tained by foaming at 840 ℃ for 20 rain and microcrystallization at 550℃ for 90 min with addition of 2% Ca-CO3 and 5% Na3PO4 · 12H2O as foaming agent and foam stabilizer, respectively.