本文研究了在1050 ℃至1200 ℃之间温度对以粉煤灰赤泥为原料烧结陶瓷的物相和烧结性能的影响.结果表明:实验用粉煤灰原料的主要矿相组成为石英(SiO_2)和莫来石(3Al_2O_3·2SiO_2),赤泥原料的主要矿相组成有钙铝黄长石(Ca_2Al_2SiO_7)、石英(SiO_2)、钙铁榴石(Ca_3Fe_2+3(SiO_4)_3)和钙钛榴石(Ca_3TiFeSi_3O_(12));以粉煤灰赤泥为原料的5组不同配比试样在1200 ℃时试样气孔率相对降低,体积密度和抗压强度相对程度增大;其中5#试样在经1200 ℃烧结后的气孔率为1.67%,体积密度为2.10 g·cm~(-3),抗压强度为123.23 MPa,达到较好的烧结致密状态,试样主要物相是钙钠长石和莫来石.试样内莫来石的形成及玻璃液相的增加促进烧结并在1200 ℃达到致密烧结状态.
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.
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