Foamed ceramic material and preparation method thereof

A technology of foamed ceramics and foaming agent, which is applied in the field of manufacturing foamed ceramic materials, can solve the problems of incapable of large-scale use and undisclosed use of tailings, etc., and achieve the effects of low water absorption, low density and high strength

Inactive Publication Date: 2012-10-10
NEW METALLURGY HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned tailings have been researched on the recovery of valuable elements and the utilization of high value-added ceramic materials, glass, and glass-ceramics, they cannot be scaled up yet.
[0004] There have been many reports on the technology of producing foamed ceramics using polished porcelain slag, waste ceramic fragments, waste sludge, industrial waste slag, quartz, clay, etc. as the main raw materials, but the use of tailings, especially tailings with high silica content, has not been publicly disclosed. Technology for preparing foamed ceramic materials as main raw materials

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0017] According to the method for preparing foamed ceramic materials of the present invention, tailings are used as the main raw material to prepare foamed ceramic materials, so that the tailings can be utilized with high added value. Here, the tailings used as the main raw material for preparing foamed ceramic materials can be at least one of iron ore tailings, quartz tailings, kyanite tailings, and bauxite tailings with a silicon dioxide content of more than 60 wt%. Specifically, the foamed ceramic material can be prepared by crushing, molding, and firing the ingredients consisting of the above-mentioned tailings, feldspar, foaming agent, foam regulator, and flux. According to an exemplary embodiment of the present invention, the ingredients used may include 65-85wt% tailings, 10-30wt% feldspar, 1-4wt% foaming agent, 0.05-2wt% foam regulator and 3-10 wt% flux.

[0018] According to an exemplary embodiment of the present invention, the feldspar may be at least one of potass...

Embodiment 1

[0030] The ingredients consisting of 57.8wt% iron ore tailings, 18wt% quartz tailings, 17wt% potassium feldspar, 1.2wt% coal powder, 3wt% boric acid and 3wt% sodium phosphate were crushed and mixed, wherein iron The silicon dioxide content in the ore tailings is 62wt%, and the silicon dioxide content in the quartz tailings is 95wt%. Ball mill the obtained ingredients for 8 hours and pass through a 250-mesh sieve. The under-screen material is manually pounded in a combined mold until it is compacted for molding. Then, the shaped ingredients are fired and puffed, and finally rapid annealed to obtain a foamed ceramic material. . Among them, in the firing and puffing step, the heating rate before 750°C is 8°C / min, the heating rate between 750°C and 1000°C is 5°C / min, and the heating rate between 1000°C and 1180°C The temperature is 3°C / min, and the temperature is kept at 1180°C for 30 minutes. After testing, the pore size of the foamed ceramic material is 1-3mm; the bulk density...

Embodiment 2

[0032] By 50wt% iron ore tailings, 20wt% quartz tailings, 5wt% bauxite tailings, 20wt% albite, 1.5wt% silicon carbide, 2wt% boric acid and 1.5wt% sodium carbonate The ingredients are crushed and mixed, wherein the content of silicon dioxide in iron ore tailings is 68wt%, the content of silicon dioxide in quartz tailings is 93wt%, and the content of silicon dioxide in bauxite tailings is 63wt%. The obtained ingredients are ball-milled for 8 hours and passed through a 250-mesh sieve, and the under-screened materials are mechanically shaken in a combination mold for 1.5 minutes to form, and then the formed ingredients are fired and puffed, and finally rapid annealed to obtain a foamed ceramic material. Among them, in the firing and puffing step, the heating rate before 750°C is 7°C / min, the heating rate between 750°C and 1000°C is 5°C / min, and the heating rate between 1000°C and 1225°C 4°C / min, keep warm at 1225°C for 45 minutes. After testing, the pore size of the foamed cerami...

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Abstract

The invention discloses a foamed ceramic material and a preparation method thereof. The method for preparing the foamed ceramic material comprises the step of: crushing, forming, firing and swelling an ingredient composed of tailings, feldspar, a foaming agent, a foaming regulator and a fluxing agent, wherein the tailings are at least one of iron ore tailings with 60 weight percent of silicon oxide, quartz tailings, kyanite tailings and bauxite tailings. According to the method for preparing the foamed ceramic material, the foamed ceramic material can be prepared by the tailings, so that the high added values of the tailings are utilized. In addition, the prepared foamed ceramic material has the advantages of excellent performances like small density, high strength, low water absorption rate, low heat conduction rate, no combustion, long service life and the like.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a foamed ceramic material used for building heat preservation and a method for manufacturing the foamed ceramic material. Background technique [0002] In recent years, fires caused by building insulation materials have occurred frequently, causing serious casualties and property losses. The "Interim Regulations on Fire Protection of External Thermal Insulation Systems and External Wall Decoration of Civil Buildings" stipulates that the combustion performance of external thermal insulation materials for civil buildings should be Class A, and should not be lower than Class B2. At present, the A-class fireproof and thermal insulation materials on the market mainly include rock wool, glass wool, foam glass, foamed cement, and closed-cell perlite. Rock wool and glass wool contain a large amount of inorganic fibers, which seriously affect the environment and human healt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02B09B3/00
Inventor 刘永锋刘开琪王秉军赵宏伟丁钰
Owner NEW METALLURGY HI TECH GRP
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