工艺参数对铁尾矿制备泡沫玻璃性能的影响

Influences of Process Parameters on Preparation of Foam Glass from Iron Ore Tailings

以铁尾矿为主要原料、CaCO3和Na2CO3为发泡剂、Na3PO4-12H2O和硼砂(Na2B4O7-10H2O)为稳定剂,制备了性能良好的泡沫玻璃材料,并研究了工艺参数对制品性能的影响,结果表明,CaCO3为主要发泡剂,Na2CO3含量对制品性能影响不大;Na3PO4-12H2O为主要稳定剂,Na2B4O7-10H2O含量不宜过多;发泡温度升高使制品孔径变大、容重和抗压强度降低;而烧结温度升高使制品的容重和抗压强度均先减小后增大.制备泡沫玻璃适宜的工艺参数为(%,ω):基础玻璃84,CaCO33,Na2CO32,Na3PO4-12H2O8,Na2B4O7-10H2O3,发泡温度900～950℃,烧结温度1100℃.由此制得的泡沫玻璃材料容重约为2.05g/cm3,抗压强度达62MPa左右.

Foam glass with good capabilities was prepared from iron ore tailings with CaCO3 and Na2CO3 as blister, sodium phosphate and borax as stabilizer. The influences of different process parameters on sample capabilities were also studied. The results show that CaCO3 is the main blister, and Na2CO3 content has little effect on sample capabilities. Sodium phosphate is the main stabilizer, while the borax content should not be high. With the increase of foaming temperature the diameter size of sample increase, while bulk density and compression strength are reduced. The bulk density and compression strength all decrease firstly and increase subsequently when the sintering temperature increases. The optimal process parameters of preparation of foam glass are basic glass content 84%, CaCO3 3%, Na2CO3 2%, sodium phosphate 8%, borax 3%（ω）, foaming temperature 900-950 ℃, and sintering temperature 1100 ℃. Under above conditions, foam glass is made with bulk density 2.05 g/cm^3 and compression strength around 62 MPa.