关键词: 粉煤灰赤泥;物相;烧结性能

Abstract: The effects of temperature on the phase characteristics and sintering properties of fly ash and red mud between 1050 ℃ to 1200 ℃ had been studied. The results showed that the main mineral phase of fly ash was quartz (SiO_2) and mullite(3Al_2O_3·2SiO_2), the major mineral phases of red mud were gehlenite (Ca_2Al_2SiO_7), quartz (SiO_2), andradite(Ca_3Fe_2+3(SiO_4)_3) and morimotoite (Ca_3TiFeSi_3O_(12)). Different ratio of fly ash and red mud samples got the relatively lower porosity, the higher bulk density and compressive strength at 1200 ℃. The 5# sample sintered at 1200 ℃ got the porosity of 1.67%, bulk density of 2.10 g·cm~(-3), compressive strength of 123.23 MPa, achieving sintering dense state, and the dominant phase was (anorthite,sodian) and mullite. The formation of mullite and addition of glass phase in the samples contributed to dense sintering at high temperature.

Key words: fly ash and red mud;phase;sintering properties