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A carbon metal compound composite material

A technology of metal compounds and composite materials, applied in the field of inorganic non-metallic materials, can solve the problems of low density of carbonaceous materials, difficulty in placing aluminum liquid, and low strength of carbonaceous materials, and achieve the effect of weak conductivity

Inactive Publication Date: 2014-10-01
REFRACTORY MATERIAL OF SINOSTEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) The density of carbonaceous materials is small, generally 1.50-1.80g / cm 3 Between, relative to 2.3g / cm 3 For the aluminum liquid with high density, there is a problem that it is difficult to place it in the aluminum liquid
In order to solve the placement problem, only the cathode is made into a special shape, or the material is directly fixed on the cathode, which brings a series of operational problems to the start-up and normal operation of the electrolyzer
[0008] (2) The strength of carbonaceous materials is low, generally 10-30MPa. For the movement of molten aluminum, the material itself is greatly worn. After 100-120 days of operation for a 100mm-high boss, the wear reaches about 50%, which cannot meet the requirements of the first generation. slot order 2000 day requirements
[0009] (3) Carbonaceous materials can only be implemented in the overhaul tank

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 220 kg of SiC with a particle size of 3-1 mm, 44 kg of SiC with a particle size of 1-0.5 mm, 176 kg of SiC with a particle size of 3 N 4 16 kg of Si with a particle size of -1 ), then soaked in asphalt impregnation solution for 60 hours, and finally in nitrogen (the space velocity ratio of nitrogen is 1.8h -1 ) or buried in carbon at 200 ° C for 200 hours (the weight ratio of fixed carbon to carbon metal compound composite material is 0.3:1 when carbon is buried).

[0039] Its properties are: SiC accounts for 53.3% of the total weight, C accounts for 25.1% of the total weight, Si 3 N 4 Accounting for 12.6% of the total weight, porosity 18.2%, bulk density 2.75g / cm 3 , Compressive strength 221MPa, flexural strength 38MPa, high temperature flexural strength (1400×0.5h℃) 41MPa.

Embodiment 2

[0041] 260 kg of SiC with a particle size of 3-1 mm, 52 kg of SiC with a particle size of 1-0.5 mm, 208 kg of SiC with a particle size of 3 N 4 , 80 kg of Si with a particle size of -1 ), then soaked in asphalt soaking solution for 8 hours, and finally in nitrogen (the space velocity ratio of nitrogen is 5.5h -1 ) or buried in carbon at 1500 ° C for 48 hours (the weight ratio of fixed carbon to carbon metal compound composite material is 1.5:1 when carbon is buried).

[0042] Its properties are: SiC accounts for 61.2% of the total weight, C accounts for 12.5% ​​of the total weight, Si 3 N 4 Accounting for 19.2% of the total weight, porosity 21.0%, bulk density 2.58g / cm3 , Compressive strength 185MPa, flexural strength 25MPa, high temperature flexural strength (1400×0.5h℃) 29MPa.

Embodiment 3

[0044] 280 kg of SiC with a particle size of 3-1 mm, 56 kg of SiC with a particle size of 1-0.5 mm, 224 kg of SiC with a particle size of 3 N 4 , 56 kg of Si with a particle size of -1 ), then soaked in bitumen soaking solution for 48 hours, and finally in nitrogen (the space velocity ratio of nitrogen is 2.9h -1 ) or buried in carbon at 600 ° C for 48 hours (the weight ratio of fixed carbon to carbon metal compound composite material is 0.6:1 when carbon is buried).

[0045] Its properties are: SiC accounts for 65.3% of the total weight, C accounts for 12.1% of the total weight, Si 3 N 4 Accounting for 14.4% of the total weight, porosity 4.0%, bulk density 2.85g / cm 3 , Compressive strength 230MPa, flexural strength 50MPa, high temperature flexural strength (1400×0.5h℃) 60MPa.

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Abstract

The invention discloses a carbon metal compound composite material which comprises the following main components: SiC, C, Si3N4 and Si. The preparation method of the carbon metal compound composite material comprises the following steps: (1), weighting, burdening and mixing SiC, C, Si3N4 and Si in proportion, and shaping; (2) nitriding and sintering at the sintering temperature of 1380-1560DEG C for 100-200 hours; (3) dipping in an asphalt impregnation liquid for 8-60 hours; and (4) roasting in nitrogen or storage carbon at 200-1500DEG C for 48-200 hours. By utilizing the carbon metal compound composite material disclosed by the invention, the aluminum liquid flowing state can be effectively improved, and the power consumption of the aluminium refining industry is lowered.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a refractory material-carbon metal compound composite material for an aluminum smelting electrolytic cell. [0002] The present invention also relates to a preparation method of the above-mentioned carbon-metal compound composite material. technical background [0003] Aluminum electrolysis is the main method of aluminum metallurgy at present, and the electrolysis of alumina is used to produce primary aluminum. Electrolyzers usually use carbon anode and carbon cathode, and use aluminum fluoride and other fluorine salts as electrolytes to make Al 2 o 3 An electrochemical reaction occurs, O 2 Molecules escape from the reaction with the anode, and the obtained molten aluminum is purified and clarified before being cast into aluminum. There are six important physical fields in the process in the aluminum electrolytic cell: potential field, current field...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/08C04B35/565C04B35/66C04B35/622
Inventor 薄钧张建芳李勇张永谦张玉涛
Owner REFRACTORY MATERIAL OF SINOSTEEL CORP
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