Effect of High Calcium Iron Tailings on Sintering Temperature and Properties of Porous Ceramics
In order to promote the high-value utilization of mining solid waste iron tailings,high-calcium iron tailings were used as the main raw material,kaolin was used as the binder,quartz was used as the aggregate,and silicon carbide was used as the foaming agent,the high-porosity iron tailings porous ceramics were prepared by"grouting molding-direct foaming method".The effects of iron tailings on the sintering temperature and performance structure of porous ceramics were studied by testing the porosity,pore size distribution,bulk density and compressive strength of porous ceramics.The results show that high calcium iron tailings can be used as fluxing agent.When raw material ratios are iron 40%tailings,20%kaolin,40%quartz,0.3%silicon carbide and sintering temperature is 1 160-1 170℃,the porous ceremics have the best properties.The bulk density is 0.38-0.46 g/cm3,the porosity is as high as 80.84%-83.5%,the average pore size is 0.33-0.88 mm,and the compressive strength is 1.95-3.28 MPa.Microscopic analysis shows that CaO produced by the decomposition of calcite in iron tailings at high temperature can react with SiO2 in raw materials to form anorthite,greatly reduce the sintering temperature and liquid viscosity of the material.At the same time,calcite and Fe2O3 in iron tailings can promote the growth of bubbles,which is beneficial to further improve the porosity.
high-calcium iron tailingsfluxing agentdirect foaming methodporous ceramicssintering temperature
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