CN111995417B - Magnesium aluminate spinel castable for aluminum melting furnace - Google Patents
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The invention relates to a magnesium aluminate spinel castable for an aluminum melting furnace, which comprises the following components in parts by weight: 40 to 55 parts of magnesium-rich spinel, 20 to 30 parts of pretreated corundum hollow sphere, 5 to 10 parts of calcium hexaluminate fine powder and alpha-Al 2 O 3 10 to 14 parts of micro powder, 3 to 6 parts of aluminum borate whisker, 2 to 4 parts of barium sulfate, 3 to 5 parts of calcium aluminate cement and 0.2 to 0.4 part of polycarboxylic acid water reducing agent. The castable prepared by the invention has the advantages of energy conservation, good erosion resistance and permeability resistance, and basically no pollution to molten metal.
Description
Technical Field
The invention belongs to the technical field of refractory materials for aluminum melting furnaces. In particular to a magnesium aluminate spinel castable used for an aluminum melting furnace.
Background
The main smelting equipment of the aluminum processing industry in China is an aluminum melting furnace, and the aluminum melting furnace has the characteristics of large capacity, high thermal efficiency, easiness in operation and the like, so that the aluminum melting furnace is widely applied. With the development of the aluminum industry in China and the technical progress, the aluminum melting furnace is continuously enlarged, which puts new requirements on refractory materials for the aluminum melting furnace. The service life of the aluminum melting furnace directly influences the production cost, and the quality of the refractory material directly influences the service life of the aluminum melting furnace; in addition, along with the improvement of the precision requirement of the aluminum alloy, the purity requirement of the aluminum is continuously increased, and the reduction of the pollution of the refractory material for the aluminum melting furnace to the aluminum liquid is also a very critical problem.
The oxidation of silicon carbide in the Chinese patent with the patent number of 200910227628.4 at high temperature leads to poor corrosion resistance; the acid pickling process in the Chinese patent with the patent number of 200910227630.1 needs to discharge a large amount of waste water; in the Chinese patent No. 200910227629.9, fused quartz is adopted to prepare a refractory castable material which is not wetted by molten aluminum, but the crystal form transformation of silicon dioxide is complex and the volume stability is insufficient; in Chinese patent application No. 201610145233.X, the infiltration resistance effect of the matrix is improved by the compound, but the infiltration resistance and the erosion resistance effect of alumina aggregate are poor; the air holes formed by high-temperature oxidation of the graphite added in the Chinese patent with the patent number of 201410527204.0 reduce the corrosion resistance; the addition of the siliceous floating beads in the Chinese patent No. 201310195883.1 can reduce the heat transfer of the casting material to achieve the purpose of energy saving, but simultaneously reduce the erosion resistance; the castable prepared in the Chinese patent with the application number of 201811474906.1 is easily wetted by aluminum liquid, and aggravates the erosion reaction; high-aluminum raw materials, flint clay and silicon dioxide contained in alumina particles respectively used in Chinese patent with the patent number of 200910227631.6 and Chinese patent with the application numbers of 201810966606.9 and 201811366800.X are easy to cause aluminum liquid pollution; the Chinese patent with the patent numbers of 201310315397.9, 201310315399.8 and 201310315674.6 and the Chinese patent with the application number of 201010141976.2 use a large amount of calcium hexaaluminate, so the cost is high; chinese patent nos. 201410323748.5 and 201410324774.X use aluminum nitride as the main raw material, which results in high cost.
Disclosure of Invention
The invention aims to provide a magnesium aluminate spinel castable for an aluminum melting furnace, and the prepared castable has the advantages of energy conservation, good erosion resistance and permeability resistance and basically no pollution to molten metal aluminum.
In order to solve the technical problems, the magnesium aluminate spinel castable for the aluminum melting furnace provided by the invention comprises the following components in parts by weight:
preferably, the magnesium-rich spinel comprises two specifications of 5-3 mm and 1-0 mm in particle size, and the weight parts of the specifications are as follows:
20 to 30 portions of magnesium-rich spinel with the diameter of 5 to 3mm
20 to 25 portions of 1 to 0mm magnesium-rich spinel.
Preferably, the granularity of the pretreated corundum hollow sphere is 3-1 mm.
Preferably, the preparation method of the pretreated corundum hollow sphere comprises the steps of soaking the corundum hollow sphere in aluminum titanate slurry with solid content not less than 35% for 12 hours, filtering the soaked corundum hollow sphere, and drying at 800 ℃ to obtain the pretreated corundum hollow sphere.
Preferably, the particle size of the calcium hexaluminate is less than or equal to 0.088mm.
Preferably, baSO in the barium sulfate 4 The mass percentage of (A) is not less than 98%.
Preferably, al in the calcium aluminate cement 2 O 3 The mass percentage of (A) is not less than 70%.
The invention has the beneficial effects that: the magnesium-rich spinel has good aluminum liquid corrosion resistance; the corundum hollow sphere pretreated by the aluminum titanate is introduced, the aluminum titanate inhibits the wetting of aluminum liquid to the corundum hollow sphere, the heat conduction of the castable is reduced by utilizing the corundum hollow sphere, the energy-saving effect is achieved, and the aim of promoting the stability of the magnesium titanate is achieved by common impurity component magnesium oxide in the magnesium-rich spinel; the calcium hexaluminate fine powder and the aluminum borate whisker are introduced into the castable, the calcium hexaluminate has excellent aluminum liquid corrosion resistance, and the aluminum borate can inhibit the wetting of aluminum liquid, toughen and strengthen a matrix, so that the aim of improving the strength of the castable is fulfilled.
Detailed Description
Example 1
A magnesium aluminate spinel castable for an aluminum melting furnace comprises the following components in parts by weight:
wherein the granularity of the pretreated corundum hollow sphere is 3-1 mm; the preparation method of the pretreated corundum hollow sphere comprises the steps of soaking the corundum hollow sphere in aluminum titanate slurry with the solid content of not less than 35% for 12 hours, filtering the soaked corundum hollow sphere, and drying at the temperature of 800 ℃ to obtain the corundum hollow sphereTo pre-treat corundum hollow spheres; the granularity of the calcium hexaluminate is less than or equal to 0.088mm; baSO in the barium sulfate 4 The mass percentage content of (A) is not less than 98%; al in the calcium aluminate cement 2 O 3 The mass percentage of (A) is not less than 70%.
Example 2
A magnesium aluminate spinel castable for an aluminum melting furnace comprises the following components in parts by weight:
wherein the granularity of the pretreated corundum hollow sphere is 3-1 mm; the preparation method of the pretreated corundum hollow sphere comprises the steps of soaking the corundum hollow sphere in aluminum titanate slurry with the solid content of not less than 35% for 12 hours, filtering the soaked corundum hollow sphere, and drying at 800 ℃ to obtain the pretreated corundum hollow sphere; the granularity of the calcium hexaluminate is less than or equal to 0.088mm; baSO in the barium sulfate 4 The mass percentage content of (A) is not less than 98%; al in the calcium aluminate cement 2 O 3 The mass percentage of (A) is not less than 70%.
Example 3
A magnesium aluminate spinel castable for an aluminum melting furnace comprises the following components in parts by weight:
wherein the granularity of the pretreated corundum hollow sphere is 3-1 mm; the preparation method of the pretreated corundum hollow sphere comprises the steps of soaking the corundum hollow sphere in aluminum titanate slurry with the solid content of not less than 35% for 12 hours, filtering the soaked corundum hollow sphere, and drying at 800 ℃ to obtain the pretreated corundum hollow sphere; the granularity of the calcium hexaluminate is less than or equal to 0.088mm; baSO in the barium sulfate 4 The mass percentage content of (A) is not less than 98%; al in the calcium aluminate cement 2 O 3 The mass percentage of (A) is not less than 70%.
Example 4
A magnesium aluminate spinel castable for an aluminum melting furnace comprises the following components in parts by weight:
wherein the granularity of the pretreated corundum hollow sphere is 3-1 mm; the preparation method of the pretreated corundum hollow sphere comprises the steps of soaking the corundum hollow sphere in aluminum titanate slurry with the solid content of not less than 35% for 12 hours, filtering the soaked corundum hollow sphere, and drying at 800 ℃ to obtain the pretreated corundum hollow sphere; the granularity of the calcium hexaluminate is less than or equal to 0.088mm; baSO in the barium sulfate 4 The mass percentage content of (A) is not less than 98%; al in the calcium aluminate cement 2 O 3 The mass percentage of (A) is not less than 70%.
Example 5
A magnesium aluminate spinel castable for an aluminum melting furnace comprises the following components in parts by weight:
wherein the granularity of the pretreated corundum hollow sphere is 3-1 mm; the preparation method of the pretreated corundum hollow sphere comprises the steps of soaking the corundum hollow sphere in aluminum titanate slurry with the solid content of not less than 35% for 12 hours, filtering the soaked corundum hollow sphere, and drying at 800 ℃ to obtain the pretreated corundum hollow sphere; the granularity of the calcium hexaluminate is less than or equal to 0.088mm; baSO in the barium sulfate 4 The mass percentage content of (A) is not less than 98%; al in the calcium aluminate cement 2 O 3 The mass percentage of (A) is not less than 70%.
The properties of the magnesium aluminate spinel castable for an aluminum melting furnace prepared in the above examples 1 to 5 are as follows:
according to the performance indexes, the magnesium aluminate spinel castable for the aluminum melting furnace has good performance.
The magnesium-rich spinel has good aluminum liquid corrosion resistance; the corundum hollow sphere pretreated by the aluminum titanate is introduced, the aluminum titanate inhibits the wetting of aluminum liquid to the corundum hollow sphere, the heat conduction of the castable is reduced by utilizing the corundum hollow sphere, the energy-saving effect is achieved, and the aim of promoting the stability of the magnesium titanate is achieved by common impurity component magnesium oxide in the magnesium-rich spinel; the calcium hexaluminate fine powder and the aluminum borate whisker are introduced into the castable, the calcium hexaluminate has excellent aluminum liquid corrosion resistance, and the aluminum borate can inhibit wetting of aluminum liquid, toughen and strengthen a matrix, so that the aim of improving the strength of the castable is fulfilled.
The above description is illustrative and not restrictive. Many modifications and variations of the present invention will be apparent to those skilled in the art in light of the above teachings, which will fall within the spirit and scope of the invention.
Claims (6)
1. The magnesium aluminate spinel castable for the aluminum melting furnace is characterized by comprising the following components in parts by weight:
40 to 55 portions of magnesium-rich spinel
20-30 parts of pretreated corundum hollow sphere
5 to 10 portions of calcium hexaluminate fine powder
3 to 6 portions of aluminum borate whisker
2 to 4 portions of barium sulfate
3 to 5 portions of calcium aluminate cement
0.2-0.4 part of polycarboxylic acid water reducing agent;
the preparation method of the pretreated corundum hollow sphere comprises the steps of soaking the corundum hollow sphere in aluminum titanate slurry with the solid content of not less than 35% for 12 hours, filtering the soaked corundum hollow sphere, and drying at 800 ℃ to obtain the pretreated corundum hollow sphere.
2. The magnesium aluminate spinel castable for the aluminum melting furnace as set forth in claim 1, wherein the magnesium-rich spinel comprises two specifications of 5-3 mm and 1-0 mm in particle size, and the specifications are as follows in parts by weight:
20 to 30 portions of magnesium-rich spinel with the diameter of 5 to 3mm
20 to 25 portions of 1 to 0mm magnesium-rich spinel.
3. The magnesium aluminate spinel castable for the aluminum melting furnace according to claim 1, wherein the grain size of the pretreated corundum hollow sphere is 3-1 mm.
4. The magnesium aluminate spinel castable for the aluminum melting furnace according to claim 1, wherein the particle size of the calcium hexaluminate is less than or equal to 0.088mm.
5. The castable of claim 1, wherein the barium sulphate contains BaSO 4 The mass percentage of (A) is not less than 98%.
6. The magnesium aluminate spinel castable for an aluminum melting furnace as set forth in claim 1, wherein the calcium aluminate cement contains Al 2 O 3 The mass percentage of (A) is not less than 70%.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113173796A (en) * | 2021-06-16 | 2021-07-27 | 郑州东豫新材料科技有限公司 | Refractory material resisting aluminum liquid corrosion and preparation method thereof |
| CN115974566A (en) * | 2023-01-03 | 2023-04-18 | 威立雅环保科技(泰兴)有限公司 | Method for prolonging service life of refractory material |
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