Experimental study on preparation of ceramic permeable pavement brick from waste incineration slag
Waste incineration slag is considered as a kind of dangerous solid waste,harmless utilization of waste incinera-tion slag is of great significance.In this study,permeable brick with satisfactory comprehensive performances was prepared by high-temperature sintering process using waste incineration slag as raw material,and the effects of waste incineration slag addition and firing temperature on the properties of samples were explored.The results showed that the strength and safety of the samples could be improved by introducing suitable amount of waste glass and properly increasing sintering tem-perature.When the amounts of waste incineration slag,waste glass and pulverized coal(additional)were 60％,40％,and 20％respectively,the water permeability coefficient,flexural strength and compressive strength of permeable brick fired at 1 200℃ reached 0.58 mm/s,6.23 MPa and 18.58 MPa,respectively.The flexural strength and permeability coefficient had respectively reached the Rf4.5 and B levels,meanwhile,the leaching concentration of Cu2+,Pb3+ and Zn2+ in the product met the GB 5085.3-2007《Identification standard for hazardous waste leaching toxicity identification》standard.The XRD and SEM-EDS analysis results showed that the high-temperature liquid phase derived from melting waste glass dissolved Pb2O3,ZnO and CuO,thus inhibiting the leaching of Cu2+,Pb3+ and Zn2+.It was also found that raising the firing temperature re-duced the porosity of the sample and promoted the dissolution of lead oxide,zinc oxide,and copper oxide,thereby synergis-tically improving the environmental safety of the product.Additionally,it was concluded that the high strength and excellent water permeability of the permeable brick was resulted from the mutual cementation of mullite and glass as well as even dis-tribution of connecting pores.
NETL
NSTL
万方数据
