Magnesium carbon-based castable

A castable, magnesium-carbon technology, applied in the field of magnesium-carbon castables and refractory castables, can solve the problems of poor oxidation resistance and high apparent porosity, and achieve strong oxidation resistance, low apparent porosity and high bulk density. Effect

Active Publication Date: 2014-04-16
江苏苏嘉集团新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of high apparent porosity and poor oxidation resistance of magnesia-carbon castables, and provide a magnesia-carbon castable with better compactness and oxidation resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Step 1: Preparation of surface-modified graphite: mix 500 liters of resol aqueous solution and 1500 liters of aluminum monoacetate aqueous solution. The mixed solution contains 5% (weight percent) of phenolic resin and 20% (weight percent) of aluminum monoacetate. Put 200 kg of graphite and 10 kg of boron carbide (D50≤3 microns) into the mixed solution, stir evenly and filter, and dry the filtered graphite with a hot air dryer at a drying temperature of 250 degrees Celsius. Surface modified graphite is obtained after drying.

[0016] Step 2: The ingredients of the magnesium-carbon castable are (in parts by weight):

[0017] Surface modified graphite 12 parts, magnesia 72 parts, alumina powder 5 parts, aluminum magnesium spinel powder 5 parts, ρ-Al 2 O 3 2.5 parts, 1.5 parts of silica micropowder, 1 part of silica sol, 0.5 part of dispersed alumina M-ADS 1 and 0.5 part of dispersed alumina M-ADW 1 and mix the above materials except silica sol.

[0018] Step 3: Add 1 part of ...

Embodiment 2

[0021] Step 1: Preparation of surface-modified graphite: mix 1500 liters of resol aqueous solution and 500 liters of aluminum monoacetate aqueous solution. The mixed solution contains 20% (weight percent) of phenolic resin and 5% (weight percent) of aluminum monoacetate. Put 150 kg of graphite, 10 kg of boron carbide (D50≤3 microns), 20 kg of metallic silicon (D50≤10 microns), and 20 kg of silicon carbide (D50≤3 microns) into the mixed solution, stir evenly, and then filter. Dry the filtered material with a hot air dryer at a temperature of 150 degrees Celsius. Surface modified graphite is obtained after drying.

[0022] Step 2: The ingredients of the magnesium-carbon castable are (in parts by weight):

[0023] 6 parts of surface-modified graphite, 88 parts of magnesia, 3 parts of silicon carbide, 2.95 parts of silicon micropowder, and 0.05 parts of sodium hexametaphosphate. Mix the above materials except for silica sol.

[0024] Step 3: Add 5 parts of tap water to the above-menti...

Embodiment 3

[0027] Step 1: Preparation of surface-modified graphite: mix 1000 liters of resol aqueous solution and 1000 liters of aluminum monoacetate aqueous solution. The mixed solution contains 10% (weight percent) of phenolic resin and 10% (weight percent) of aluminum monoacetate. Put 200 kg of graphite (D50≤5 micron), 20 kg of boron carbide (D50≤1 micron), and 20 kg of silicon carbide (D50≤1 micron) into the above mixed solution, stir evenly, and then filter. Dry the filtered material with a hot air dryer at a temperature of 250 degrees Celsius. Surface modified graphite is obtained after drying.

[0028] Step 2: The ingredients of the magnesium-carbon castable are (in parts by weight):

[0029] Surface modified graphite 1 part, magnesia 93.8 parts, silicon carbide 3 parts, magnesium oxide powder 1.5 parts, silicon powder 0.5 parts, sodium hexametaphosphate 0.15 parts, sodium tripolyphosphate 0.05 parts, mix the above materials except silica sol uniform.

[0030] Step 3: Add 4.5 parts o...

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Abstract

The invention relates to a magnesium carbon-based castable. The magnesium carbon-based castable comprises the following components in parts by weight: 1-12 parts of surface modified graphite, 72-93.8 parts of magnesia, 3-15 parts of alumina oxide micro powder or / and aluminum-magnesium spinel micro powder or / and silicon carbide, 2-5 parts of binding agent, and 0.05-1 part of water reducer, wherein the binding agent is one or more of Rho-Al2O3, magnesium oxide micro powder, silicon micro powder and silica solution, and the water reducer comprises one or more of sodium tripolyphosphate, sodium hexametaphosphate, dispersing alumina oxide M-ADS1, and dispersing alumina oxide M-ADW1. The magnesium carbon-based castable has the advantages of less water amount for pouring, large volume density and low apparent porosity after molding, and strong oxidation resistance at high temperature, and is not easy to permeate and erode by high temperature steel slag in use.

Description

Technical field [0001] The invention relates to a refractory castable, especially a magnesium-carbon castable, belonging to the technical field of refractory preparation. Background technique [0002] Refractory materials are widely used in metallurgy, chemical industry, petroleum, machinery manufacturing and other fields due to their good refractory properties. The melting point of carbon such as graphite exceeds 3500°C, and the melting point of magnesium oxide can reach 2800°C. Both materials are excellent refractory materials and do not melt at high temperatures. Therefore, the magnesia-carbon brick obtained by compounding magnesia and carbon has the advantages of magnesia and carbon, and has excellent slag erosion resistance, slag permeability and thermal conductivity. It can be used for the lining and tapping of steel-making converters. High-power electric furnace lining, refining furnace lining outside the furnace, ladle slag line and other parts are currently one of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 俞晓东张雪松
Owner 江苏苏嘉集团新材料有限公司
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