低品位锂辉石对铝矾土尾矿制备莫来石基复相陶瓷的影响

在铝矾土尾矿减量消纳利用制备陶瓷材料的基础上,探究低品位锂辉石的助熔作用对制备莫来石基复相陶瓷的影响。在配料—混料—干燥—成型—烧结的制备工艺过程中外加低品位锂辉石,探究外加剂含量(0%、2%、 5%、10%)和烧结温度(850、900、950 ℃ )对莫来石基复相陶瓷物相行为、显微形貌和力学性能的影响规律。 结果表明,经低温烧结制得莫来石基复相陶瓷的主要物相为石英、莫来石、刚玉,提高烧结温度在热力学和动力学方面均有利于莫来石的形成;锂辉石的助熔作用可增加试样中的莫来石和刚玉等优质耐高温物相,在微观形貌上起到支撑骨架作用,有利于提高试样的力学性能;外加 10%低品位锂辉石时,在 950 ℃ 温度下保温 2 h 获得试样的常温抗压强度为 47. 0 MPa、体积密度为 1. 77 g / cm³。

Influence of Low Grade Spodumene on Preparation of Mulite-based Compound Ceramics with Bauxite Tailings

On the basis of ceramic preparation with reusing of bauxite tailings,explore the influence of melting effect of low grade spodumene on the preparation of mulite-based compound ceramics. The effects of admixture content (0%,2%,5%, 10%) and sintering temperature (850,900,950 ℃ ) on the phase behavior,microstructure and mechanical properties of mullite multiphase ceramics,which are prepared by batching-mixing-drying-forming-sintering were studied. The results show that the main phases of mullite multiphase ceramics prepared by low temperature sintering is quartz,mullite and corundum,increasing sintering temperature is beneficial to mullite formation in both thermodynamic and kinetic aspects. The melting effect of low garde spodumene can increase the high temperature resistant phases of mullite and corundum in the samples,and play a supporting role in the microstructure,which is beneficial to improve the mechanical properties of the samples. The test sample,with the admixture content of 10% and preparation at 950 ℃ for 2 h,was appeared the compressive strength of 47. 0 MPa and the volume density of 1. 77 g / cm³.