A neutral refractory material for medium-frequency induction furnace lining and its preparation method

Abstract

This invention discloses a neutral refractory material for medium-frequency induction furnace linings. The raw materials include: 78-83 parts by weight of quartz sand, 5-7 parts by weight of fire clay, 5-7 parts by weight of fluorite, 0.8-1.2 parts by weight of alumina, 1.2-1.8 parts by weight of silicon carbide, and 0.3-0.7 parts by weight of calcium oxide. The preparation method is also disclosed. The method of this invention is simple, with the main components being quartz sand, fire clay, and fluorite, with quartz sand comprising the largest proportion. In addition, some additives such as alumina, silicon carbide, and calcium oxide are added to improve the refractory properties and chemical reactivity of the furnace charge. This results in a material with certain slag resistance and a good service life, exhibiting good overall performance and suitable for melting various metals. The furnace lining mixture is non-toxic, harmless, environmentally friendly, and pollution-free.

Description

Technical Field

[0001] This invention belongs to the field of refractory material manufacturing technology for medium-frequency furnaces, and particularly relates to a neutral refractory material for medium-frequency induction furnace linings and its preparation method. Background Technology

[0002] As an important metal melting device, the choice of lining material for an intermediate frequency furnace directly affects its service life and melting efficiency. The materials used for intermediate frequency furnace linings typically include acidic, basic, and neutral linings. The specific choice depends on factors such as the furnace's operating conditions, the type of metal being melted, and the lining's lifespan and cost. Neutral linings are a type of material between acidic and basic linings, usually made by mixing acidic and basic materials in a certain proportion. Summary of the Invention

[0003] The purpose of this invention is to provide a neutral refractory material for medium-frequency induction furnace linings and its preparation method. This method is simple, with the main components being quartz sand, fire clay, and fluorite, with quartz sand comprising the largest proportion. In addition, some additives such as alumina, silicon carbide, and calcium oxide are added to improve the refractory properties and chemical reactivity of the furnace charge. The resulting material possesses certain slag resistance and a good service life, exhibiting excellent overall performance and suitable for melting various metals. The furnace lining mixture is non-toxic, harmless, environmentally friendly, and pollution-free.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] The present invention discloses a method for preparing a neutral refractory material for medium-frequency induction furnace lining, the raw materials comprising: 78-83 parts by weight of quartz sand, 5-7 parts by weight of fire clay, 5-7 parts by weight of fluorite, 0.8-1.2 parts by weight of alumina, 1.2-1.8 parts by weight of silicon carbide and 0.3-0.7 parts by weight of calcium oxide.

[0006] Furthermore, the raw materials include: 78-83 parts by weight of quartz sand, 5-7 parts by weight of fire clay, 5-7 parts by weight of fluorite, 1 part by weight of alumina, 1.5 parts by weight of silicon carbide and 0.5 parts by weight of calcium oxide. After being mixed evenly, an economical refractory material for medium-frequency induction furnace lining is obtained.

[0007] Furthermore, the raw materials include: 78 parts by weight of quartz sand, 7 parts by weight of fire clay, 7 parts by weight of fluorite, 1 part by weight of alumina, 1.5 parts by weight of silicon carbide and 0.5 parts by weight of calcium oxide.

[0008] Furthermore, the raw materials include: 83 parts by weight of quartz sand, 5 parts by weight of fire clay, 5 parts by weight of fluorite, 1 part by weight of alumina, 1.5 parts by weight of silicon carbide and 0.5 parts by weight of calcium oxide.

[0009] A method for preparing a neutral refractory material for medium-frequency induction furnace lining, comprising the following specific steps:

[0010] (1) First, mix the quartz sand, fire clay, and fluorite evenly;

[0011] (2) Add the evenly mixed material into the mixer, then add alumina, silicon carbide and calcium oxide, and mix thoroughly a second time to ensure that the various raw materials are evenly distributed, thus obtaining neutral furnace charge;

[0012] (3) Pour the neutral furnace charge into the furnace body mold and use a vibrating platform to compact and level the bottom surface;

[0013] (4) After placing the conical mold core, fill the surrounding area with neutral furnace charge and compact it by vibration. Compact it layer by layer until it reaches the height of the furnace opening, level the furnace opening, and grind the furnace opening taper and the guide port.

[0014] (5) The prepared neutral furnace charge should be stored in a well-ventilated and dry environment to avoid absorbing external moisture and water, which would affect the stability of the furnace charge; it can be used after air drying for 3 to 5 days.

[0015] Furthermore, in step (3), a suitable furnace charge covering thickness and addition amount are selected according to the production environment to achieve the stability of the molten pool.

[0016] Furthermore, in step (4), the purpose of the compaction is to create a close bond between the raw materials in order to improve their refractory properties and thermal stability.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0018] The furnace lining of this invention possesses both slag resistance and a good service life, making it suitable for melting a variety of metals. The neutral furnace lining offers the advantage of good overall performance and suitability for melting various metals. The furnace lining mixture is non-toxic, harmless, environmentally friendly, and pollution-free. Attached Figure Description

[0019] Figure 1 This is a comparative diagram showing the actual furnace opening conditions in Example 1;

[0020] Figure 2 This is a comparative diagram showing the actual furnace opening situation in Example 2. Detailed Implementation

[0021] Example 1:

[0022] A method for preparing a neutral refractory material for medium-frequency induction furnace linings involves using 78 parts by weight of quartz sand, 7 parts by weight of fire clay, 7 parts by weight of fluorite, 1 part by weight of alumina, 1.5 parts by weight of silicon carbide, and 0.5 parts by weight of calcium oxide. After thorough mixing, an economical refractory material for medium-frequency induction furnace linings is obtained. During the mixing process, it is crucial to prevent conductive materials and impurities from contaminating the furnace charge. When preparing neutral furnace charges, the quality and proportion of raw materials must be ensured to avoid affecting the chemical composition and properties of the charge.

[0023] The specific operational steps of the method for constructing furnace linings using the furnace lining material prepared above include:

[0024] (1) First, mix the quartz sand, fire clay, and fluorite evenly;

[0025] (2) Add the evenly mixed material into the mixer, then add alumina, silicon carbide and calcium oxide, and mix thoroughly a second time to ensure that the various raw materials are evenly distributed, thus obtaining neutral furnace charge;

[0026] (3) Pour the neutral charge into the furnace body mold and use a vibrating platform to compact and level the bottom surface. The appropriate charge coverage thickness and amount should be selected based on the production environment to achieve a stable molten pool.

[0027] (4) After placing the conical mold core, fill the surrounding area with neutral furnace charge and compact it by vibration. Compact it layer by layer to the height of the furnace opening, level the furnace opening, and grind the taper and guide port of the furnace opening. Vibration is to form a tight bond between the raw materials to improve their refractory performance and thermal stability;

[0028] (5) The prepared neutral furnace charge should be stored in a well-ventilated and dry environment to avoid absorbing external moisture and water, which would affect the stability of the furnace charge. It can be used after air drying for 3 to 5 days.

[0029] Figure 1 In (a) the refractory furnace lining of the non-patented formulation, there are 60-80 parts of fused white corundum, 10-25 parts of fused magnesia, 5-15 parts of α-Al2O3 powder, and 3-7 parts of binder (the binder is boric acid). Figure 1 (b) The actual comparison of the furnace mouth after each furnace lining is smelted 10 times using the refractory material of the formula of this patent.

[0030] Example 2:

[0031] A method for preparing a neutral refractory material for medium-frequency induction furnace linings involves using 83 parts by weight of quartz sand, 5 parts by weight of fire clay, 5 parts by weight of fluorite, 1 part by weight of alumina, 1.5 parts by weight of silicon carbide, and 0.5 parts by weight of calcium oxide. After thorough mixing, an economical refractory material for medium-frequency induction furnace linings is obtained. During the mixing process, it is crucial to prevent conductive materials and impurities from contaminating the furnace charge. When preparing neutral furnace charge, the quality and proportion of raw materials must be ensured to avoid affecting the chemical composition and properties of the charge.

[0032] The specific operational steps of the method for constructing furnace linings using the furnace lining material prepared above include:

[0033] (1) First, mix the quartz sand, fire clay, and fluorite evenly;

[0034] (2) Add the evenly mixed material into the mixer, then add alumina, silicon carbide and calcium oxide, and mix thoroughly a second time to ensure that the various raw materials are evenly distributed, thus obtaining neutral furnace charge;

[0035] (3) Pour the neutral charge into the furnace body mold and use a vibrating platform to compact and level the bottom surface. The appropriate charge coverage thickness and amount should be selected based on the production environment to achieve a stable molten pool.

[0036] (4) After placing the conical mold core, fill the surrounding area with neutral furnace charge and compact it by vibration. Compact it layer by layer to the height of the furnace opening, level the furnace opening, and grind the taper and guide port of the furnace opening. Vibration is to form a tight bond between the raw materials to improve their refractory performance and thermal stability;

[0037] (5) The prepared neutral furnace charge should be stored in a well-ventilated and dry environment to avoid absorbing external moisture and water, which would affect the stability of the furnace charge. It can be used after air drying for 3 to 5 days.

[0038] (6) Figure 2 (a) Refractory lining materials not formulated in this patent: 60-80 parts fused white corundum, 10-25 parts fused magnesia, 5-15 parts α-Al2O3 powder, and 3-7 parts binder (boric acid). and (b) Refractory lining materials formulated in this patent: actual furnace mouth conditions after 10 heats of smelting each material.

[0039] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A neutral refractory material for medium-frequency induction furnace lining, characterized in that: Raw materials include: 78-83 parts by weight of quartz sand, 5-7 parts by weight of fire clay, 5-7 parts by weight of fluorite, 0.8-1.2 parts by weight of alumina, 1.2-1.8 parts by weight of silicon carbide and 0.3-0.7 parts by weight of calcium oxide.

2. The neutral refractory material for medium-frequency induction furnace lining according to claim 1, characterized in that: Raw materials include: An economical refractory material for medium-frequency induction furnace lining is prepared by mixing 78-83 parts by weight of quartz sand, 5-7 parts by weight of fire clay, 5-7 parts by weight of fluorite, 1 part by weight of alumina, 1.5 parts by weight of silicon carbide and 0.5 parts by weight of calcium oxide.

3. The neutral refractory material for medium-frequency induction furnace lining according to claim 1, characterized in that: Raw materials include: 78 parts by weight of quartz sand, 7 parts by weight of fire clay, 7 parts by weight of fluorite, 1 part by weight of alumina, 1.5 parts by weight of silicon carbide and 0.5 parts by weight of calcium oxide.

4. The neutral refractory material for medium-frequency induction furnace lining according to claim 1, characterized in that: Raw materials include: 83 parts by weight of quartz sand, 5 parts by weight of fire clay, 5 parts by weight of fluorite, 1 part by weight of alumina, 1.5 parts by weight of silicon carbide and 0.5 parts by weight of calcium oxide.

5. The method for preparing neutral refractory material for medium-frequency induction furnace lining according to any one of claims 1-4, characterized in that: The specific operating steps include: (1) First, mix the quartz sand, fire clay, and fluorite evenly; (2) Add the evenly mixed material into the mixer, then add alumina, silicon carbide and calcium oxide, and mix thoroughly a second time to ensure that the various raw materials are evenly distributed, thus obtaining neutral furnace charge; (3) Pour the neutral furnace charge into the furnace body mold and use a vibrating platform to compact and level the bottom surface; (4) After placing the conical mold core, fill the surrounding area with neutral furnace charge and compact it by vibration. Compact it layer by layer until it reaches the height of the furnace opening, level the furnace opening, and grind the furnace opening taper and the guide port. (5) The prepared neutral furnace charge should be stored in a well-ventilated and dry environment to avoid absorbing external moisture and water, which would affect the stability of the furnace charge; it can be used after air drying for 3 to 5 days.

6. The method for preparing neutral refractory material for medium-frequency induction furnace lining according to claim 5, characterized in that: In step (3), the appropriate furnace charge coverage thickness and addition amount are selected according to the production environment to achieve the stability of the molten pool.

7. The method for preparing neutral refractory material for medium-frequency induction furnace lining according to claim 1, characterized in that: In step (4), the purpose of the compaction is to create a close bond between the raw materials in order to improve their fire resistance and thermal stability.

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