Method for producing foamed glass by using copper tailings

A technology of foam glass and copper tailings, which is applied in the field of foam glass manufacturing, can solve the problems of environmental pollution and waste of resources, and achieve the effects of low thermal conductivity, low water absorption, and reduced production costs

Inactive Publication Date: 2008-05-21
SHAANXI UNIV OF SCI & TECH
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AI-Extracted Technical Summary

Problems solved by technology

It pollutes the environm...
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Method used

Embodiment 1, puts into ball mill tank after the waste copper tailings is broken and ball mills to below 300 orders; Waste glass is cleaned up, and after drying, ball mills to below 300 orders; By massfraction, 57% copper tailings are , 35% of waste glass, 0.4% of carbon black, 2.6% of sodium fluorosilicate, and 5% of sodium phosphate are put into a ball mill jar and milled to below 200 mesh; sodium fluorosilicate and sodium phosphate are used as additives, Its function is to effectively reduce the foaming temperature of the foam glass, improve the performance of the foam glass, increase the closed-cell structure, and also enhance the low-temperature viscosity of the glass melt, enhance the toughness, and play a role in stabilizing the foa...
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Abstract

The invention provides a method of producing foam glass with copper tailings. The copper tailings, waste glass, coal black, sodium fluosilicate and sodium phosphate are added in a heat-resistant steel die after being put in a ball milling tank to be milled into 200 orders below. Then, the die is moved into a foaming furnace to obtain foam glass through the preheating, the foaming, the foam stabilizing and the annealing. The invention uses industrial waste copper tailings as raw materials to prepare the foam glass, added with a little additive. The invention is beneficial to the waste utilization and the environment protection. And the obtained foam glass has the advantages of structure with high strength, low water absorption rate, small density and low thermal conductivity. The invention can effectively lower the production cost of the foam glass, protect the environment and change wastes into valuables. The properties of the produced foam glass are that the density is smaller than 0.8g/cm<3>, the water absorption rate is smaller than 1.5vol percent, the average foam diameter is 1-3mm, and the flexural strength can reach to 2.0MPa.

Technology Topic

Examples

  • Experimental program(7)

Example Embodiment

[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.

Example Embodiment

[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.

Example Embodiment

[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.
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PUM

PropertyMeasurementUnit
Flexural strength1.7MPa
Flexural strength1.5MPa
Flexural strength1.3MPa
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Classification and recommendation of technical efficacy words

  • Low water absorption
  • High strength
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