Abstract:In recent years, accompanying with the tightening of environmental policies and the support and encouragement of government for resource recycling industry, how to recycle, reduce,and harmlessly utilize bulk solid waste has become a hot research topic. As two common types of bulk solid waste, gold tailings and alkali residue occupy land, and their effective components have not been comprehensively utilized and have caused resource waste. In this study, weathered rock type gold tailings and alkali residue are used as main raw materials, insulation porous ceramic products are prepared, and the influence of alkali metals on the properties of porous ceramics are investigated. Porous ceramics are prepared by using a high solid waste content of 88% (79% altered rock type gold tailings (ARGT)+9% alkali residue (SR)). By adding MgO powder, the performance of porous ceramic products can be adjusted. The test sample is sintered at 1 170 ℃. The properties of raw materials and products are characterized by using XRD, XRF, SEM and universal material testing machine. The final product is a porous ceramic product rich in pyroxene phase (with the best results of bulk density and compressive strength of 0.50 g/cm3 and 6.02 MPa respectively), which meets the performance requirements of the Md5 foam block product in the "Tailed Sand Microcrystalline Foam Board and Block" (JG/T 506—2016) (bulk density≤500 g/cm3, compressive strength≥6.00 MPa). This study will provide a theoretical basis for the preparation of porous ceramics while utilizing dual solid waste for resource utilization and reduction.
