铁尾矿制备莫来石复相陶瓷的工艺研究

A Technological Study of Mullite Quartz Composite Ceramics Prepared with Iron Tailings

以铁尾矿为主要原料,通过常压固相烧结制备莫来石复相陶瓷。研究了铁尾矿粉末级配(150目与325目的质量比分别为2:1,1:1和1:2)、烧结温度(1100,1150,1200,1250℃)对陶瓷材料物相、气孔率及抗压强度的影响。结果表明,所制备试样为以石英为主相的莫来石-石英复相陶瓷。随着铁尾矿中细粉含量增加,复相陶瓷的气孔率及抗压强度均先减小后增加,材料的体积密度呈相反的变化趋势。随着烧结温度升高,材料的气孔率逐渐减小,抗压强度呈先降低后增加的趋势。莫来石复相陶瓷材料的最佳制备工艺为:铁尾矿中150目与325目粉末的质量比为1:1,烧结温度为1250℃,此时材料气孔率为6.6%,抗压强度为83.02 MPa。以期为铁尾矿制备莫来石陶瓷提供参考。

Mullite-quartz composite ceramics materials were prepared by solid-phase sintering method at atmospheric pressure using iron tailings as the main raw material.The effects of iron tailings gradation(the mass ratio of powders with the particle size of 150 mesh to that of 325 mesh was 2:1,1:1 and 1:2,respectively)and sintering temperature(1100,1150,1200,1250℃)on porosities and compressive strengths of mullite-quartz composite ceramics materials were studied.The results show that the mullite-quartz composite ceramics materials were prepared successfully.With the increase of powders with the particle size of 325 mesh in iron tailings,the porosities and compressive strengths of mullite-quartz composite ceramics materials all decrease first and then increase.The bulk densities of mullite-quartz composite ceramics materials present an opposite trend.With the increase of sintering temperature,the porosities of mullite-quartz composite ceramics materials decrease gradually and compressive strengths decrease first and then increase.The optimum parameter of mullite-quartz composite ceramics materials were as follows:the mass ratio of powders with the particle size of 150 mesh to that of 325 mesh in iron tailings was 1:1 and the sintering temperature was 1250℃,which could obtain the samples with the porosity of 6.6%and compressive strength of 83.02 MPa.The results provide an idea for the prepare of mullite-quartz composite ceramics materials using iron tailings.