Amorphous refractory and corrosion resistant material for inert anode aluminum cells and manufacturing method thereof

An aluminum electrolytic cell and an inert anode technology, which is applied in the field of unshaped refractory and corrosion-resistant materials, can solve the problems of unexplained corrosion resistance, unspecified purity, and decreased strength at medium temperature, and achieves good corrosion resistance, uniform particle distribution, The effect of small open porosity

Inactive Publication Date: 2012-02-08
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the prebaked anode aluminum electrolysis technology has achieved good indicators, it has its own inherent defects: for example, the consumable carbon anode needs to be replaced regularly, which not only brings a large workload to the operation, but also brings a negative impact on carbon resources. a lot of pressure; the production process of primary aluminum electrolysis and anode roasting emits a lot of CO 2 , producing more than 1.8 tons of CO for every ton of aluminum produced 2 , and at the same time due to the strong greenhouse gas produced by the anode effect, the actual ton of aluminum is directly equivalent to CO 2 emissions of more than 2.5 tons
Although the material is mainly sintered plate-shaped corundum with high purity, and no silica powder is added, there is no description of the overall purity, nor its corrosion resistance, and more aluminate cement is used in its formula ( 5~10%), not only will introduce more impurities, but also will make the mid-temperature strength drop more

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Each material is configured according to the following weight ratio. Among them, Al of sintered tabular alumina 2 o 3 Content 99.5wt%, Al of calcined alumina micropowder 2 o 3 Content≥99.6wt%, active ρ-Al 2 o 3 Micronized Al 2 o 3 Content 99.8wt% (after removing ignition loss), Al of dispersible alumina 2 o 3 Content 80wt%, Al of pure calcium aluminate cement 2 o 3 Content 73wt%.

[0040] Sintered platy corundum particles, particle size 3-6mm 30%;

[0041] Sintered plate-like corundum particles particle size 1-3mm 22%;

[0042] Sintered plate-like corundum particles particle size 0-1mm 12%;

[0043] Sintered tabular corundum particles, particle size 0-0.5mm 6%;

[0044] Sintered tabular corundum fine powder Particle size ≤0.045mm 13%;

[0045] Calcined alumina micropowder 8%;

[0046] Activated alumina micropowder 2%;

[0047] Activated rho alumina powder 2%;

[0048] Dispersed alumina micropowder 1%;

[0049] Pure calcium aluminate cement 4%;

[005...

Embodiment 2

[0052] Each material is configured according to the following weight ratio. Among them, Al of sintered tabular alumina 2 o 3 Content 99.5wt%, magnesium aluminum spinel fine powder Al 2 o 3 Content ≥ 74wt%, Al of calcined alumina micropowder 2 o 3 Content≥99.6wt%, active ρ-Al 2 o 3 Micronized Al 2 o 3 Content 99.8wt% (after removing ignition loss), Al of dispersible alumina 2 o 3 Content 80wt%, Al of pure calcium aluminate cement 2 o 3 Content 73wt%.

[0053] Sintered plate-like corundum particles particle size 3-6mm 28%;

[0054] Sintered plate-like corundum particles particle size 1-3mm 26%;

[0055] Sintered platy corundum particles, particle size 0-1mm 16%;

[0056] Sintered tabular corundum fine powder Particle size ≤0.045mm 10%;

[0057] Magnesium aluminum spinel fine powder particle size ≤0.045mm 4%;

[0058] Calcined alumina micropowder 8%;

[0059] Activated alumina micropowder 2%;

[0060] Active rho alumina powder 1%;

[0061] Dispersed alumina micr...

Embodiment 3

[0065] Each material is configured according to the following weight ratio. Among them, Al of sintered tabular alumina 2 o 3 Content 99.5wt%, Al of magnesium aluminum spinel particles 2 o 3 Content ≥ 74wt%, magnesium aluminum spinel fine powder Al 2 o 3 Content ≥ 74wt%, Al of calcined alumina micropowder 2 o 3 Content≥99.6wt%, active ρ-Al 2 o 3 Micronized Al 2 o 3 Content 99.8wt% (after removing ignition loss), Al of dispersible alumina 2 o 3 Content 80wt%, Al of pure calcium aluminate cement 2 o 3 Content 73wt%.

[0066] Sintered platy corundum particles, particle size 1-3mm 46%;

[0067] Magnesium-aluminum spinel particle size 0.5-1mm 15%;

[0068] Magnesium aluminum spinel particle size 0-0.5mm 10%;

[0069] Magnesium-aluminum spinel particle size ≤ 0.045mm 5%;

[0070] Sintered tabular corundum fine powder Particle size ≤0.045mm 9%;

[0071] Calcined alumina micropowder 6%;

[0072] Activated alumina micropowder 2%;

[0073] Active rho alumina powder 1...

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Abstract

The invention relates to an amorphous refractory and corrosion resistant material for inert anode aluminum cells and a manufacturing method thereof. The preparation of the material is characterized by employing sintered tabular corundum particles as the aggregate, powder selected from several of sintered tabular corundum fine powder, magnesia-alumina spinel fine powder, multi-peak sintered alumina micropowder with different particle size distributions, activated alumina micropowder, activated Rho-Al2O3 micropowder, dispersion alumina micropowder and pure calcium aluminate cement as the substrate, fiber as the reinforcing and toughening agent for mixing. Able to well resist electrolyte atmosphere corrosion, the amorphous refractory and corrosion resistant material of the invention has the advantages of high hot strength, good thermal shock resistance, easy implementation, long service period, relative low cost, etc. The material provided in the invention is suitable for heat preservation and sealing of industrial inert anode aluminum cells, especially the upper parts of cells, and can be used to directly face a fused electrolyte liquid surface and areas with invaded by an electrolyte atmosphere.

Description

technical field [0001] The invention relates to an unshaped refractory and corrosion-resistant material for an inert anode aluminum electrolytic cell and a manufacturing method thereof. Background technique [0002] Since the advent of Hall-Heroult's cryolite-alumina molten salt electrolysis method, this method has been the mainstream method for producing primary aluminum in industry. The principle is that in the electrolytic cell, the cryolite-alumina molten salt is used as the electrolyte, and the alumina in the molten salt is decomposed by direct current. Aluminum water is precipitated at the cathode, and gas is precipitated at the anode. The density of aluminum water is higher than that of the electrolyte, and the aluminum water gathers at the bottom of the electrolytic cell. When there is a certain amount, the aluminum water is taken out and poured into aluminum ingots. The anode gas overflows, and is emptied or collected after purification and dust removal. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B2235/5244C04B2235/9676C04B2235/5292C04B35/1015C04B2235/5224C04B2235/5248C04B35/76C04B2235/526C04B2235/5436C04B2235/72C04B2235/5264C04B2235/5228C04B2235/5481C04B35/66
Inventor 包生重杨建红李旺兴梁玉东丁成栋
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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