Method for melting and casting alpha alumina product

A technology for α-alumina products, which is applied in the field of melting and casting of α-alumina products, can solve the problems of affecting the normal use of kilns, cracks in products, and increased porosity of products, etc., and achieves fine crystallization, long service life, and faster The effect of melting speed

Active Publication Date: 2011-11-16
郑州振中电熔新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Refractory products used in key parts such as non-ferrous metal smelting furnaces and high-temperature tunnel kilns need to have super high-temperature resistance and corrosion resistance due to direct contact with non-ferrous metal melts or high temperatures above 1700 ° C, while melting and casting α alumina The products can just meet these requirements, but due to the great difficulty in the production of fused-cast α-alumina products, it is mainly manifested in the large volume change (about 23.5%) in the process of melting and crystallization, which makes the products prone to cracks. At the same time, due to the high temperature oxidation Aluminum melt easily absorbs a large amount of gas, which increases the porosity of the product and the structure is not dense, which seriously affects the service life
Therefore, many manufacturers use fused and cast α-β alumina products instead, which directly affects the normal use of the kiln.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for melting and casting alpha alumina products, the steps of which are as follows:

[0021] (1) Calculate the weight of raw materials according to the following chemical composition, expressed in parts by weight based on oxides: Al 2 o 3 : 98.5, SiO 2 : 0.1, Na 2 O: 0.9, put the raw materials into the mixer, mix for 30 minutes to make a mixture, Al 2 o 3 From Al 2 o 3 ≥99% industrial alumina powder, SiO 2 From SiO 2 ≥99% refined silica sand, Na 2 O comes from Na 2 CO 3 ≥99% first-grade industrial sodium carbonate, feed 1000kg per furnace, produce one furnace every 100 minutes;

[0022] (2) Add the mixture in step (1) to the electric arc furnace for melting and refining, control the secondary voltage to 170V, the current to 5000A, and the melting time to 100 minutes. In this process, the current, voltage and The amount of material to be added, and at the same time, the melt level in the furnace should be well controlled to ensure that after each furn...

Embodiment 2

[0027] A method for melting and casting alpha alumina products, the steps of which are as follows:

[0028] (1) Calculate the weight of raw materials according to the following chemical composition, expressed in parts by weight based on oxides: Al 2 o 3 : 99, SiO 2 : 0.5, Na 2 O: 1.2, put the raw materials into the mixer, mix for 20 minutes to make a mixture, Al 2 o 3 From Al 2 o 3 ≥99% industrial alumina powder, SiO 2 From SiO 2 ≥99% refined silica sand, Na 2 O comes from Na 2 CO 3 ≥99% first-grade industrial sodium carbonate, 500kg per furnace, producing one furnace every 60 minutes;

[0029] (2) The mixture in the step (1) is added to the electric arc furnace for melting and refining, the secondary voltage is controlled to be 210V, the electric current is 4800A, and the melting time is 60 minutes;

[0030] (3) the molten solution melted in the step (2) is cast in the mold that graphite plate is made, casting speed is 20kg / second by product weight;

[0031] (4)...

Embodiment 3

[0034] A method for melting and casting alpha alumina products, the steps of which are as follows:

[0035] (1) Calculate the weight of raw materials according to the following chemical composition, expressed in parts by weight based on oxides: Al 2 o 3 : 99, SiO 2 : 0.3, Na 2 O: 1.0, put the raw materials into the mixer, mix for 20 minutes to make a mixture, Al 2 o 3 From Al 2 o 3 ≥99% industrial alumina powder, SiO 2 From SiO 2 ≥99% refined silica sand, Na 2 O comes from Na 2 CO 3 ≥99% first grade industrial sodium carbonate, feed 1200kg per furnace, produce one furnace every 130 minutes;

[0036] (2) The mixture in the step (1) is added to the electric arc furnace for melting and refining, the secondary voltage is controlled to be 230V, the electric current is 4500A, and the melting time is 130 minutes;

[0037](3) casting the molten solution melted in the step (2) into a mold made of corundum sand, the casting speed is 25kg / second by product weight;

[0038] (...

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Abstract

The invention discloses a method for melting and casting an alpha alumina product, which comprises the following steps: calculating the weight of the raw materials according to the following chemical components, as a percentage by weight based on the oxides, 98-99 of Al2O3, 0.1-0.5 of SiO2, 0.9-1.2 of Na2O, preparing a mixture, then adding into an electric arc furnace for melting and refining, then casting into a mold, removing the mold to obtain the alpha alumina product. The alpha alumina product provided in the invention has the advantages of no cracks, tight structure, high refractoriness and high strength of temperature structure, good chemical stability at high temperature, wherein the refractoriness temperature is above 1900 DEG C, the compressive strength at normal temperature is more than 200 MPa, which can satisfy the use requirements of nonferrous metals furnaces and high temperature tunnel kilns, the service life is long and the production cost of users can be greatly reduced, so that the method of the invention can provide visible economic benefit to the users.

Description

technical field [0001] The invention relates to a melting and casting refractory product, in particular to a melting and casting method of alpha alumina products. Background technique [0002] Refractory products used in key parts such as non-ferrous metal smelting furnaces and high-temperature tunnel kilns need to have super high-temperature resistance and corrosion resistance due to direct contact with non-ferrous metal melts or high temperatures above 1700 ° C, while melting and casting α alumina The products can just meet these requirements, but due to the great difficulty in the production of fused-cast α-alumina products, it is mainly manifested in the large volume change (about 23.5%) in the process of melting and crystallization, which makes the products prone to cracks. At the same time, due to the high temperature oxidation The molten aluminum is easy to absorb a large amount of gas, which increases the porosity of the product and the structure is not compact, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/657C04B35/66C04B35/10
Inventor 徐宝奎赵建国李起胜董建国刘兆兴
Owner 郑州振中电熔新材料有限公司
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