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Preparation method of antioxidant carbon block with heat and alkaline etching resistance

A technology of anti-oxidation and high temperature resistance, applied in the field of crucible or furnace lining block materials, can solve the problems of non-reusability and short service life of the coating, and achieve the effect of facilitating industrial application, improving high temperature resistance and reducing production costs

Active Publication Date: 2013-06-05
宁夏高创特能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the application of the coating solves the high-temperature oxidation resistance of carbon materials, reduces the cost, and facilitates production operations, the service life of the coating is short and cannot be reused

Method used

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  • Preparation method of antioxidant carbon block with heat and alkaline etching resistance
  • Preparation method of antioxidant carbon block with heat and alkaline etching resistance
  • Preparation method of antioxidant carbon block with heat and alkaline etching resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Take 150g of aluminum chloride, 100ml of ammonia water (the mass fraction of ammonia water is 5%), and 750g of distilled water. Add aluminum chloride to distilled water, heat the water bath to 80°C, add ammonia water dropwise and stir, after hydrolysis for 2 hours, add 50ml of glacial acetic acid dropwise (the mass fraction of glacial acetic acid is 40%), continue to keep warm and stir for 6 hours, and obtain a solid content of 15 % alumina sol.

[0049] Take high-purity graphite micropowder, silica powder, alumina sol, and silicon carbide micropowder as raw materials; take 5Kg according to the ratio of high-purity graphite micropowder 80%, silica fume 5%, alumina sol 10%, and silicon carbide micropowder 5%, According to the process parameters of mixing, drying, biscuit forming, pre-sintering and sintering processes, the required carbon blocks are obtained. The performance test results are shown in Example 1 in Table 1.

[0050] A carbon block with a size of 50mm×30mm...

Embodiment 2

[0053] Take 200g of aluminum chloride, 150ml of ammonia water (the mass fraction of ammonia water is 5%), and 650g of distilled water. Add aluminum chloride to distilled water, heat the water bath to 75°C, add ammonia water dropwise and stir, after hydrolysis for 2 hours, add 75ml of hydrochloric acid (the mass fraction of hydrochloric acid is 25%), and continue to keep warm and stir for 10 hours to obtain a solid content of 20%. Alumina sol.

[0054] Take high-purity graphite micropowder, silica powder, alumina sol, and silicon carbide micropowder as raw materials; take 5Kg by weighing 70% of high-purity graphite micropowder, 10% of silica fume, 10% of alumina sol, and 10% of silicon carbide micropowder, According to the aforementioned process parameters, the required carbon block is obtained by sequentially performing material mixing, drying, molding, pre-sintering and sintering. The performance test results are shown in Example 2 in Table 1.

[0055] Cut off a carbon bloc...

Embodiment 3

[0058] Take 250g of aluminum chloride, 200ml of ammonia water (the mass fraction of ammonia water is 5%), and 550g of distilled water. Add aluminum chloride to distilled water, heat the water bath to 85°C, add ammonia water dropwise and stir, and after hydrolysis for 2 hours, add 100ml of nitric acid (the mass fraction of nitric acid is 20%) dropwise, and continue to keep warm and stir for 20 hours to obtain a solution with a solid content of 25%. Alumina sol.

[0059] Take high-purity graphite micropowder, silica powder, alumina sol, and silicon carbide micropowder as raw materials; take 5Kg by weighing 60% of high-purity graphite micropowder, 10% of silica fume, 20% of alumina sol, and 10% of silicon carbide micropowder, According to the aforementioned process parameters, the required carbon block is obtained by sequentially performing material mixing, drying, molding, pre-sintering and sintering. The performance test results are shown in Example 3 in Table 1.

[0060] Cut...

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Abstract

A preparation of an antioxidant carbon block with heat and alkaline etching resistance belongs to the heat and alkaline etching resistance material field. The preparation of the antioxidant carbon block with heat and alkaline etching resistance is characterized in that the antioxidant carbon block comprises the following raw materials, by mass, 60% to 80% of graphite micro powders, 5% to 20% of silicon powders, 5% to 30% of alumina sol, and 0% to 15% of silicon carbide micro powders, and the antioxidant carbon block is prepared by mixing materials, spray drying, forming, presintering and sintering. Heat and alkaline etching resistant and antioxidant experimental tests show that: carbon block materials of the antioxidant carbon block have alkaline etching resistant service life of 120 to 240 hours and antioxidant service life of 70 to 120 hours under high temperature of 1750 DEG C. Besides, the preparation of the antioxidant carbon block with heat and alkaline etching resistance is simple in process, capable of achieving production of a crucible large in size or furnace liner materials, convenient to apply to industries, and capable of being repeatedly used and lowering production cost.

Description

technical field [0001] The invention relates to a carbon block material, in particular to a high-temperature alkali corrosion-resistant, oxidation-resistant carbon block material with a long service life, which is mainly used in smelting, slagging, directional solidification and casting of solar-grade polysilicon prepared by metallurgical methods. Crucible or furnace lining block material in the ingot production process. Background technique [0002] With the increasingly serious energy crisis, the development of sustainable and environmentally friendly new energy has become a hot spot of global concern. As a clean, efficient and renewable new energy, solar energy has become the focus of new energy development in various countries. At present, among many types of solar cells, polycrystalline silicon solar cells are the leading products to be applied. Metallurgical purification of solar-grade polysilicon has the characteristics of simple process, low cost, and low environmen...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/622C04B35/63C01F7/34C01F7/30
Inventor 盛之林刘应宽罗学涛栾晓军常学军沈建宁谢永龙方明卢成浩
Owner 宁夏高创特能源科技有限公司
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