Method for synthesizing porous cordierite-mullite composite material by utilizing solid wastes

Abstract

The method provides a method for synthesizing a porous cordierite-mullite composite material by utilizing solid wastes, belonging to the technical field of synthesis of inorganic nonmetallic materials. In the method, gangue, waste refractory materials (waste magnesium carbon bricks and sliding bricks) and sawdust (a pore-forming agent) are taken as raw materials, 35-55% of gangue, 3-10% of used magnesium carbon bricks, 10-50% of used sliding bricks and 5-40% of sawdust by mass are mixed, and the raw materials are insulated at the temperature of 1340-1460 DEG C for 2-6h in air atmosphere aftermolding to obtain synthetic sintered compact. The porous cordierite-mullite composite material synthesized by the invention has rupture strength of 24.33MPa, apparent porosity of 25.44%, thermal expansion coefficient of 3.8*10<-6>K<-1> and volume density of 1.94g / cm3, and has uniform micro appearance and good high temperature performance. The porous cordierite-mullite composite material not only solves the problem that stack of the solid wastes in quantity results in pollution to the environment and can be applied to kiln furniture in ceramic industry, but also conforms to the industrial policy, circular economy, advocated by the state.

Description

technical field [0001] The invention relates to the technical field of synthesis of inorganic non-metallic materials, in particular to a method for synthesizing a porous cordierite-mullite composite ceramic material at atmospheric pressure using solid waste (coal gangue and waste refractory materials as raw materials, and sawdust as a pore-forming agent) . Background technique [0002] In the process of coal mining, from the roof and floor of the coal seam, those carbonaceous shales with low carbon content and ash content exceeding 40% that are not coal-forming, argillaceous shale, and those around the carbon layer during excavation The blasted argillaceous shale, sandy shale and a small amount of limestone are collectively referred to as "coal gangue". Coal gangue is the solid waste with the largest emission in my country. It is a waste generated during coal production and processing. The emission is equivalent to 8% to 20% of coal output, with an average of about 12%. At...

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Problems solved by technology

[0006] The research on the synthesis of porous cordierite-mullite composite materials at home and abroad has been reported, but the research on the synthesis of porous cordierite-mullite composite materials by completely using solid waste has not been reported. 1. The synthesis of porous cordierite-mullite composite materials from sawdust not only solves the environmental pollution caused by the accumulation of solid waste, but also the synthesized porous cordierite-mullite composite materials can be used in the ceramic industry, which not only saves production At the same time, it has considerable economic benefits and is also in line with the industrial policy of "circular economy" advocated by the state

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