Preparation And Characterization Of Porous Ceramics From Oily Soil And Waste Glass

Oily soil and waste glass are two kinds of solid waste that causes more serious pollution to the environment.The use of oily soil and waste glass to prepare porous ceramics is an effective way to waste into treasure,and has a good economic benefit.On the one hand this method can effectively recover the treatment of oily soil and waste glass,to reduce the environmental pollution pressure.On the other hand,the porous ceramic material has good economic value.It can be widely used in chemical industry,construction and other fields,has a good application prospects.In this study,oily soil and waste glass were used as the main raw materials,while one or more of calcium carbonate,carbon powder and amylum were used as pore-forming agents,and sodium silicate was added as flux.By controlling the firing temperature system,the final preparation of porous ceramic materials.In this paper,we mainly studied the influence of the following conditions on the structure and properties of the samples,including the ratio of different oily soil to waste glass,different pore forming agent and flux addition,different sintering temperature and holding time.The results of this experiment show that: The oily soil and waste glass in the sample were used in higher utilization,and the mixed amount of oily soil was above 25 wt%.When the sintering temperature is 850 °C and the holding time is 20 min,the properties of the samples are balanced,the flexural strength is 3.91~4.43 MPa,the compressive strength is 10.42~12.59 MPa and the thermal conductivity is 0.0722 W/(m·K).The sample can be applied to wall insulation materials.The relationship between the thermal conductivity and its porosity is negatively correlated.When the ratio of pore-forming agent to the ratio of oily soil and waste glass is fixed,the incorporation of flux(sodium silicate)increases,and the three-dimensional network structure between the ions in the sintering process is broken,which can reduce the softening temperature of the system,but the excessive amount of incorporation will lead to the sintering process of the body surface collapse,uneven distribution of pores.When the content of pore-forming agent and flux is fixed with the ratio oily soil and waste glass,the sintering temperature is 850 °C,the pore structure is uniform,the porosity is 52.38%,and the flexural strength is 4.43 MPa.In the range of 750 °C to 850 °C,the improvement of the sintering temperature can promote the softening of the green body,easy to make the hole,increase the porosity and increase the pore size.The sintered body is more compact and the mechanical strength is increased.When the sintering temperature is 850~1050 °C,the pores produced by the pore-forming agent are liable to overflow from the green body,and the surface collapse phenomenon occurs.The porosity of the sample was reduced to 36.48%.In the 0~20 min holding time,the extension of the holding time can promote the formation and growth of stomata.The porosity of the sample reached 51.40%.But when the holding time is more than 20 min,the stomatal shape is difficult to control,and through the increase in stomata,but also the phenomenon of stomatal overflow of the body,so porosity gradually reduced.The main reason for the decrease of the mechanical properties of the samples caused by the irregular shape of the pores.