Preparation and properties of foamed ceramics based on fly ash and lithium slag
In order to prepare low-cost foamed ceramics with high porosity and compressive strength,foamed ceramics samples were prepared at different temperatures(1 180,1 200,1 220 and 1 240 ℃)for different durations(10,20,40 and 60 min),using fly ash,lithium slag,feldspar,talcum and silicon carbide as raw materials.The effects of the lithium slag addition(0,10％,20％and 30％,by mass)on the phase composition,microstructure,porosity,and compressive strength of the samples were studied.The results show that:(1)with the increase of the lithium slag addition,the porosity of the samples increases;the bulk density decreases;the compressive strength fluctuates;(2)the calcium and sulfur components in lithium slag work as the fluxing agent and foaming agent,which reduces the sintering temperature,increases the porosity,improves the pore roundness and enhances the compressive strength;(3)when the lithium slag addition is 20％,for the sample obtained at 1 220 ℃ for 20-40 min,the bulk density is 0.32-0.40 g·cm-3,the porosity is 84.4％-87.6％and the compressive strength is 1.51-2.35 MPa.
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