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A method for preparing porous ceramics from waste magnesium oxide

A technology of porous ceramics and magnesia, which is applied in the field of preparing porous ceramics from waste magnesia, can solve the problems of difficult sintering, high sintering temperature, large energy consumption, etc., and achieve the effects of realizing green environmental protection, simple preparation process and reducing zero emission

Active Publication Date: 2021-02-19
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patents CN200710128439.2, CN87102516, CN200710139287.6 and other foam ceramics with MgO as the main body generally have a sintering temperature between 1450°C and 1800°C, and the common temperature is 1650°C. The sintering temperature is high, sintering is difficult, and energy consumption is large.

Method used

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  • A method for preparing porous ceramics from waste magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) MgO waste: 70 parts, Al2O3: 20 parts, MgF2 10 parts, dissolved in 4% carboxymethyl cellulose solution, sand milled at 1300r / min for 1h, passed through a 325 mesh sieve, and dried to obtain A ceramic powder slurry with a solid content of about 50%.

[0023] (2) Soak the polyurethane foam with a pore size distribution of 2-25 holes / cm in the slurry obtained in (1), and hang the slurry every 30 minutes, repeat three times, until the organic foam quality no longer increases after the slurry, after drying, Raise the temperature at a rate of 1°C / min to 1450°C, sinter for 2 hours, and cool down with the furnace to obtain a porous magnesium oxide ceramic.

[0024] The compressive strength of the magnesium oxide porous ceramic material is 2.1MPa.

Embodiment 2

[0026] (1) MgO waste: 85 parts, Al 2 o 3 :10 parts, MgF 2 5 parts were dissolved in 4% carboxymethyl cellulose solution, sand-milled at 1300 r / min for 1 hour, and passed through a 325-mesh sieve to obtain a ceramic powder slurry with a solid content of about 60%.

[0027] (2) Soak the polyurethane foam with a pore size distribution of 2-25 holes / cm in the slurry obtained in (1), and hang the slurry every 30 minutes, repeat three times, until the organic foam quality no longer increases after the slurry, after drying, Raise the temperature at a rate of 1°C / min to 1550°C, sinter for 4 hours, and then cool down with the furnace to obtain porous magnesium oxide ceramics.

[0028] The compressive strength of the magnesium oxide porous ceramic material is 2.7 MPa.

Embodiment 3

[0030] (1) the combined material MgO waste: 80 parts, Al 2 o 3 :15 parts, MgF 2 5 parts were dissolved in 5% carboxymethyl cellulose solution, sand milled at 1300 r / min for 1 hour, and passed through a 325 mesh sieve to obtain a ceramic powder slurry with a solid content of about 50-60%.

[0031] (2) Soak the polyurethane foam with a pore size distribution of 2-25 holes / cm in the slurry obtained in (1), and hang the slurry every 30 minutes, repeat three times, until the organic foam quality no longer increases after the slurry, after drying, Raise the temperature at a rate of 1°C / min to 1450°C, sinter for 2-4 hours, and then cool down in the furnace to obtain a porous magnesium oxide ceramic.

[0032] The compressive strength of the magnesium oxide porous ceramic material is 2.4MPa.

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Abstract

The invention discloses a method for preparing porous ceramics from waste magnesium oxide, which includes organic impregnation. The preparation process of organic impregnation includes the following steps: (1) 70-85 parts of waste magnesium oxide, Al 2 o 3 10‑20 parts, MgF 2 5-10 parts are dissolved in 2-6% carboxymethyl cellulose solution, sand milled for 0.5-2h, and sieved to obtain a ceramic powder slurry with a solid content of 50-60%; (2) the pore size distribution is The polyurethane foam of 2-25 holes / cm is soaked in the slurry obtained in step (1), and hangs the slurry every 20-40min, repeats, until after the slurrying, the quality of the organic foam no longer increases, and rises to 1300-1300 after drying. Sintering at 1550°C for 2-4 hours, and cooling with the furnace to obtain porous magnesium oxide ceramics. The invention adopts magnesium oxide waste for oriented silicon steel, the magnesium element of which is basically recycled, the preparation process is simple and the cost is low, the recovery efficiency reaches 100%, and the invention is economical and environment-friendly.

Description

technical field [0001] The invention relates to the field of preparation of porous ceramics, in particular to a method for preparing porous ceramics from waste magnesium oxide. Background technique [0002] Magnesium alloy has the advantages of high specific strength, specific stiffness and specific elastic modulus, and good damping and shock resistance, so it is widely used in transportation, aerospace, electronic communication and other fields. However, no matter the pure magnesium produced by electrolysis or reduction method contains a variety of inclusions, these inclusions have great harm to the mechanical and corrosion resistance of the material, and further purification is required to meet the use requirements, thus hindering The scope of application of magnesium metal materials has been expanded. Compared with the currently serialized foam ceramics such as Al2O3, ZrO, SiC, Si3N4, etc., the use of MgO foam ceramics to purify magnesium liquid has the advantages of hig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/04C04B35/622C04B35/63C04B35/636C04B38/06
CPCC04B35/04C04B35/62204C04B35/6303C04B35/6365C04B38/067C04B2235/3206C04B2235/3217C04B2235/445C04B2235/96C04B38/0615
Inventor 殷玫婕黄雪松胡义纯倪建春吴昊张明周浩梁黄晓明
Owner BAOSHAN IRON & STEEL CO LTD
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