Preparation of Porous Ceramic Materials from High-Sulfur Copper Tailings and Its Pore Structure Properties
The porous ceramics was preparated using high-sulfur copper-tailings as the main raw material.Firstly,flotation and magnetic separation desulfurization were carried out on the tailings to reduce the total sulfur content from 6.40%to 0.69%.The effects of raw material ratio,grinding time,and foaming agent dosage on the apparent density and compressive strength of porous ceramic materials were studied through conditional experiments.When the amount of desulfurization copper tailings was 60%,the amount of potassium feldspar was 20%,the amount of sodium feldspar was 15%,the amount of silicon micro powder was 5%,the amount of foaming agent SiC was 0.3%,and the grinding time was 40 minutes,the performance of porous ceramics was the best.The apparent density was 412 kg/m3,and the compressive strength was 2.94 MPa.The pore structure of porous ceramics was analyzed using industrial CT,and the total porosity of porous ceramics was 56.93%,with a closed porosity of up to 56.51%,The average throat length was 1 357.1 μ m.It has high sealing performance,providing excellent insulation and thermal insulation performance for porous ceramics.
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