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Ceramsite non-sticky to aluminum and preparation method of ceramsite

A technology of ceramsite and aluminum dipping, which is applied in the field of non-aluminum ceramsite and its preparation, can solve the problems of high thermal conductivity, high cost, and difficult performance to meet production requirements.

Inactive Publication Date: 2012-07-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Taking aluminum metallurgy as an example, aluminum melting furnaces use commonly used raw materials such as dense ceramsite, fused alumina, and sintered alumina, plus anti-seepage agents such as silicon carbide, aluminum titanate, calcium fluoride, and barium sulfate. Moreover, the thermal conductivity is high and the heat loss is serious; if light raw materials and low-cost high-silicon raw materials are used, aluminization or reaction with molten aluminum is easy to occur, and the performance is difficult to meet production requirements.

Method used

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  • Ceramsite non-sticky to aluminum and preparation method of ceramsite
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  • Ceramsite non-sticky to aluminum and preparation method of ceramsite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0150] Embodiment 1: (soaking)

[0151] Prepare the fluorine-containing compound aqueous solution and the calcium-containing compound aqueous solution first, soak the ceramsite in the fluorine-containing compound aqueous solution, and after drying, soak the ceramsite treated with the fluorine-containing compound aqueous solution in the calcium-containing compound aqueous solution, and the surface generates fluorine Calcium, after washing and drying, put it into a high-temperature furnace for heat treatment. The heat treatment temperature is 800-1200 ° C, and the holding time is 1-4 hours. Finally, a layer of calcium fluoride is coated on the surface of the ceramsite. The specific implementation scheme is shown in Table 1. The distribution of ceramsite before treatment is as follows: figure 1 , where 1 is ceramsite. The cross-sectional view of the ceramsite with calcium fluoride coating obtained by the method is as follows figure 2 , where 1 is ceramsite substrate, 3 is cal...

Embodiment 2

[0166] Embodiment 2 (spraying)

[0167] Prepare the fluorine-containing compound aqueous solution and the calcium-containing compound aqueous solution first, spray the fluorine-containing compound aqueous solution on the surface of the ceramsite for drying, and then spray the calcium-containing compound aqueous solution on the surface of the ceramsite that has been sprayed with the fluorine-containing compound aqueous solution until it is wet, and react Calcium fluoride precipitates are formed, washed with water and dried, then placed in a high-temperature furnace for heat treatment at a temperature of 800-1200°C, and the holding time is 1-4 hours. Finally, a layer of calcium fluoride is obtained on the surface of the ceramsite. The specific implementation scheme is shown in Table 2. The distribution of ceramsite before treatment is as follows: figure 1 , where 1 is ceramsite. The cross-sectional view of the ceramsite with calcium fluoride coating obtained by the method is a...

Embodiment 3

[0182] Embodiment 3: (spraying)

[0183] Commercially purchased or prepared calcium fluoride powder is made into slurry, and the mass fraction of calcium fluoride in the slurry is 10%, 15%, 18%, 22%, 26%, 30%, sprayed on the surface of the ceramsite until it is completely wet , dried, and placed in a high-temperature furnace for heat treatment for 1 to 4 hours at a temperature of 800°C to 1200°C. The specific implementation scheme is shown in Table 3. The distribution of ceramsite before treatment is as follows: figure 1 , where 1 is ceramsite. The cross-sectional view of the ceramsite with calcium fluoride coating obtained by the method is as follows figure 2 , where 2 is ceramsite substrate and 3 is calcium fluoride coating

[0184] The coating is generated by spraying calcium fluoride powder slurry with a mass fraction of 10% on the surface of the ceramsite, and the mass percentage of calcium fluoride is 13%;

[0185] The coating is generated by spraying calcium fluor...

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Abstract

The invention discloses a ceramsite non-sticky to aluminum and a preparation method of the ceramsite. The preparation method of the ceramsite comprises the steps of: preparing a fluorine-containing compound water solution, a calcium-containing compound water solution, a calcium fluoride sol and a calcium fluoride powder body slurry; preparing a sulfate radical-containing compound water solution, a barium-containing compound water solution, a barium sulfate sol and a barium sulfate powder body slurry; preparing a titanium-aluminum compound sol and an aluminum titanate powder body slurry; and respectively carrying out surface coating and heat treatment on the ceramsite, and enabling the surface of the ceramsite to be coated with a layer of calcium fluoride, barium sulfate or aluminum titanate or 2-3 layers of two or three of the calcium fluoride, the barium sulfate and the aluminum titanate. As the calcium fluoride, the barium sulfate and the aluminum titanate are non-infiltrative to the aluminum, the treated ceramsite is non-infiltrative to the aluminum. While the calcium fluoride, the barium sulfate and the aluminum titanate enter in cracks and holes of the ceramsite, and the cracks and the holes can be repaired after the calcium fluoride, the barium sulfate and the aluminum titanate are sintered at a high temperature, so that the compression strength of the ceramsite is enhanced.

Description

technical field [0001] The invention relates to a refractory particle and a preparation method thereof, in particular to a non-sticking aluminum ceramsite and a preparation method thereof. Background technique [0002] With the rapid growth of my country's demand for non-ferrous metals, non-ferrous smelters continue to adopt new processes and technologies to make non-ferrous metallurgical furnaces larger and more efficient to meet the requirements of the times, which makes the use of refractory materials more and more harsh. Many new requirements have been put forward for refractory materials. The selection of refractory materials has become one of the key links in production. The contact parts of molten metal in non-ferrous metallurgical furnaces are all made of dense and high-quality refractory materials. [0003] Taking aluminum metallurgy as an example, aluminum melting furnaces use commonly used raw materials such as dense ceramsite, fused alumina, and sintered alumina, ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 王家邦吴自敏尹述伟
Owner ZHEJIANG UNIV