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Pyrophyllite non-sticky to aluminum and preparation method of pyrophyllite

A pyrophyllite and aluminum-dipping technology, which is applied in the field of refractory material particles and their preparation, can solve the problems of high thermal conductivity, high cost, and difficult performance to meet production requirements.

Inactive Publication Date: 2014-01-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Taking aluminum metallurgy as an example, aluminum melting furnaces use commonly used raw materials such as dense pyrophyllite, fused alumina, and sintered alumina, plus anti-seepage agents such as silicon carbide, aluminum titanate, calcium fluoride, and barium sulfate, which are not only expensive , and the thermal conductivity is high, and the heat loss is serious; if light raw materials and low-cost high-silicon raw materials are used, it is easy to aluminize or react with molten aluminum, and the performance is difficult to meet the production requirements

Method used

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  • Pyrophyllite non-sticky to aluminum and preparation method of pyrophyllite
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  • Pyrophyllite non-sticky to aluminum and preparation method of pyrophyllite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] Embodiment 1: (soaking)

[0152] Prepare the fluorine-containing compound aqueous solution and the calcium-containing compound aqueous solution first, soak the pyrophyllite in the fluorine-containing compound aqueous solution, dry and then soak the pyrophyllite treated with the fluorine-containing compound aqueous solution in the calcium-containing compound aqueous solution, the surface Calcium fluoride is generated, washed and dried, then placed in a high-temperature furnace for heat treatment, the heat treatment temperature is 800-1200°C, and the heat preservation time is 1-4 hours. Finally, a layer of calcium fluoride is coated on the surface of pyrophyllite. The specific implementation scheme is shown in Table 1. The distribution of pyrophyllite before treatment is as follows figure 1 , where 1 is pyrophyllite. Its sectional view of the pyrophyllite with calcium fluoride coating that adopts the method gained is as follows figure 2 , where 1 is the pyrophyllite s...

Embodiment 2

[0167] Embodiment 2 (spraying)

[0168] 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 pyrophyllite and dry it, and then spray the calcium-containing compound aqueous solution on the surface of the pyrophyllite that has been sprayed with the fluorine-containing compound aqueous solution until it is wet , react to generate calcium fluoride precipitate, wash and dry, put into high temperature furnace for heat treatment, heat treatment temperature is 800-1200 ℃, holding time is 1-4 hours, finally get a layer of calcium fluoride on the surface of pyrophyllite. The specific implementation scheme is shown in Table 2. The distribution of pyrophyllite before treatment is as follows figure 1 , where 1 is pyrophyllite. Its sectional view of the pyrophyllite with calcium fluoride coating that adopts the method gained is as follows figure...

Embodiment 3

[0183] Embodiment 3: (spraying)

[0184] Commercially available 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 pyrophyllite until completely Wet, dry, and place 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 pyrophyllite before treatment is as follows figure 1 , where 1 is pyrophyllite. Its sectional view of the pyrophyllite with calcium fluoride coating that adopts the method gained is as follows figure 2 , where 2 are pyrophyllite substrates and 3 are calcium fluoride coatings

[0185] The coating is generated by spraying calcium fluoride powder slurry with a mass fraction of 10% on the pyrophyllite surface, and the calcium fluoride calcium fluoride mass percentage is 13%;

[0186] The coating is generated by sprayin...

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Abstract

The invention discloses a pyrophyllite non-sticky to aluminum and a preparation method of the pyrophyllite. The preparation method of the pyrophyllite 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 pyrophyllite, and enabling the surface of the pyrophyllite 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 pyrophyllite is non-infiltrative to the aluminum. While the calcium fluoride, the barium sulfate and the aluminum titanate enter in cracks and holes of the pyrophyllite, 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 pyrophyllite is enhanced.

Description

technical field [0001] The invention relates to a refractory particle and a preparation method thereof, in particular to an aluminum-free pyrophyllite 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 pyrophyllite, fused alumina, and sintered alumina, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/628
Inventor 吴自敏王家邦尹述伟
Owner ZHEJIANG UNIV