Study On Preparation And Performance Of Red Mud High Aluminum Fly Ash-based Porous Ceramics By Melting Foaming Method

Porous ceramics are used as filtration components,catalyst carriers,energy storage elements,and electromagnetic shielding,sound absorbing materials,and the like.In recent years,with the use of solid waste high added value,it has been developed using low-cost solid waste resources as a raw material to prepare porous ceramics.In order to expand the coordination of solid waste resources,improve the relevant theory,promote the industrialization process,this paper uses red mud,high-aluminum powder coal ash as the main raw material,respectively as a foaming agent,sodium,potassium longite,for flux,respectively,with Ca CO₃and Si C preparation of red mud-high aluminum powder coal base porous ceramics by high temperature melt foaming method,and the effects of different aggregates,foaming agents and foaming temperatures on porous ceramic preparation,and test analysis of correlation performance.When the bones and high-aluminum powder coal ashes were melt foamed at different temperatures,the aggregate composition ingredients had a large influence,the higher the degree of aggregate melt,and the porous ceramic aperture obtained at the same temperature the larger,the bubble distribution tends to be uniform.With the addition of the foaming agent Ca CO₃,the pore size of the porous ceramic sample obtained under the same conditions is significantly increased,the amount of pores decreases;and the increase in the Ca CO₃content makes it decomposed to form a low melting point to form a low melting point.The phase is achieved,and the degree of aggregate melt is improved.The addition of the foaming agent Si C in the high temperature sintering process changed the viscosity of the aggregate,thereby causing a greater impact on the foaming bubble structure.The effect of flux and foaming processes on the structure of red mud-high aluminum powder coal base porous ceramic cells showed different effects.The addition of sodium potassium and potassium waith has also changed the content of Si O₂in the composition composition of the raw material component,and the change in the formation of the foaming raw material is larger,when the raw material component is in the raw material component When the mass ratio of Al₂O₃is increased from 1.25,1.46 to 1.81,the obtained porous ceramic foam structure is transformed by a closed hole,and a communication hole to the composite biocomposite structure;and the influence of the foaming process has a relatively small effect.The degree of foaming matrix has a great influence,in comparable,foaming temperature is more pronounced in the impact of the thermosetting time on the degree of melt.By controlling the ingredient component of the foaming raw material,a uniform melt having a suitable viscosity at high temperature is a key to preparing high porosity redispere porous ceramics by molten foaming method.With the increase in Si O₂content in the foaming raw material composition,the high-melting level of the high-melting point in the matrix gradually transforms low-melting longite mineral minerals,and the content of the clay mineral mineral content of the tackifier is increased,and therefore,it is conducive to forming the viscosity Uniform melt.When the aggregate is composed of the red mud and the high aluminum powder coal ash,5 wt%Si C is used as a blowing agent,30 wt%sodium,potassium longite is a flux,at 1200°C insulation 1 h The average aperture is 0.98 mm,the apparent porosity is 76.55%,the volume density is 0.92 g/cm³,and the cells distributed more uniform composite cells-high aluminum powder coal-based porous ceramics;The strength is 4.25 MPa,the thermal conductivity is 0.41 W/（m·K）.In addition,the content of Si O₂in the foaming raw material component is increased by silica ash,and the potassium longite is increased,and the same foaming effect is exhibited under the same foaming process conditions,and the cooperative complementary use of solid waste resources is further verified.Feasibility.