Method for producing foamed glass by using copper tailings

[0016] In Example 1, the waste copper tailings were crushed and put into a ball mill tank and ball milled to below 300 mesh; the waste glass was washed clean, and ball milled to below 300 mesh after drying; 57% of the copper tailings, 35% by mass fraction The waste glass, 0.4% carbon black, 2.6% sodium fluorosilicate, and 5% sodium phosphate are put into a ball mill tank and ball milled to below 200 mesh; the sodium fluorosilicate and sodium phosphate are used as additives. In order to effectively reduce the foaming temperature of the foamed glass, improve the performance of the foamed glass, increase the closed-cell structure, in addition, it can also enhance the low-temperature viscosity of the glass melt, enhance the toughness, and stabilize the foam. Then add the above ball milled batch to the heat-resistant steel mold, and then move the mold into the foaming furnace to heat; from room temperature at a temperature rise rate of 10°C/min to 400°C, keep it for 20 minutes, and then at 20°C/min The temperature rise rate is raised to 920℃ and the temperature is kept for 30min; the rapid cooling stage, the cooling rate is 20℃/min, the cooling rate is 500℃, and the constant temperature is 30min; the annealing stage, the cooling rate is 1℃/min, and the foam glass is annealed below 50℃. . The formed foam glass has a uniform structure and a density of 0.8g·cm -3 , The water absorption rate is 1.5vol%, the average bubble diameter is 1.5mm, and the flexural strength reaches 1.8MPa.

[0017] In Example 2, the waste copper tailings were crushed and put into a ball mill tank to be ball milled to below 300 mesh; the waste glass was cleaned, and ball milled to below 300 mesh after drying; 51% copper tailings, 42% by mass fraction The waste glass, 0.5% carbon black, 5% sodium fluorosilicate, 1.5% sodium phosphate are put into the ball mill tank and ball milled to below 200 mesh; the above ball milled batch is added to the heat-resistant steel mold, and then Move the mold into the foaming furnace and heat it; from room temperature to 400°C at a heating rate of 11°C/min, hold for 23min; then at a heating rate of 18°C/min to 900°C, hold for 40min; rapid cooling stage, cooling The speed is 20°C/min, cooling to 550°C, and the constant temperature is 40min; in the annealing stage, the temperature cooling speed is 1.5°C/min, and the foam glass is obtained by annealing to below 50°C. The formed foam glass has a uniform structure and a density of 0.7g·cm -3 , The water absorption rate is 1.0vol%, the average bubble diameter is 1.4mm, and the flexural strength reaches 1.7MPa.

[0018] In Example 3, the waste copper tailings were crushed and put into a ball mill tank to be ball milled to below 300 mesh; the waste glass was washed clean, and ball milled to below 300 mesh after drying; 50% copper tailings, 45% by mass fraction The waste glass, 0.2% carbon black, 2.5% sodium fluorosilicate, 2.3% sodium phosphate are put into a ball milling tank and ball milled to below 200 mesh; the above ball milled batch is added to a heat-resistant steel mold, and then Move the mold into the foaming furnace and heat; rise from room temperature to 400°C at a heating rate of 12°C/min and hold for 26 minutes; then rise to 880°C at a heating rate of 15°C/min and hold for 52 minutes; rapid cooling stage, cooling rate It is 18℃/min, cooled to 540℃, and kept constant for 50min; in the annealing stage, the cooling rate is 2℃/min, and the foam glass is obtained by annealing to below 50℃. The formed foam glass has a uniform structure and a density of 0.7g·cm -3 , The water absorption rate is 0.8vol%, the average bubble diameter is 1.5mm, and the flexural strength reaches 2.0MPa.