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Silicon carbide ramming material high in abrasion resistance and application thereof

A wear-resistant silicon carbide and ramming material technology is applied in the field of high wear-resistant silicon carbide ramming materials, which can solve the problems of short service life and achieve the effects of long service life, high heat transfer coefficient and improved erosion.

Active Publication Date: 2012-04-18
上海皕涛耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the silicon carbide ramming material imported from Germany is used in the wear-resistant lining of the water pipe wall of the gasifier of the synthetic ammonia plant, and the service life is only 8500 hours.

Method used

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  • Silicon carbide ramming material high in abrasion resistance and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Combine 55 parts of super-grade silicon carbide, 15 parts of α-type silicon nitride, and 10 parts of zirconium corundum (using high-zirconium corundum, of which ZrO 2 The content of 40%), 3.2 parts of alumina powder (3um) and 2 parts of silica powder (8um), 13 parts of 50% aluminum chromium phosphate aqueous solution, coagulant is active ρ-alumina 1 part and magnesium oxide 0.5 0.3 parts of explosion-proof fiber with a diameter of 1.5μm.

[0020] The above-mentioned raw materials are mixed and stirred in a forced mixer for 3-5 minutes. After the mixing and stirring are uniform, they are rammed and formed on the inner wall of the gasification furnace. After natural curing at 10 degrees Celsius for 6 hours, the ramming material is finally set and formed. The ramming material lining is heated at 7~9℃ / h to 540℃ in the oven process, and after holding for 16~18h, the aluminum chromium phosphate colloid forms P 2 O 5 -Al 2 O 3 -Cr 2 O 3 The composite reacts with the mixture in a s...

Embodiment 2

[0022] Combine 57 parts of special grade silicon carbide, 14 parts of α-type silicon nitride, and 7 parts of zirconium corundum (using high-zirconium corundum, of which ZrO 2 The content of 40%), 3.3 parts of alumina powder (4um), 1.5 parts of silica powder (8um), 12 parts of 60% aluminum chromium phosphate aqueous solution, coagulant is 2.5 parts of active ρ-alumina and 0.5 parts of oxidation Magnesium, 2.5 parts of bismuth iodoxy tannate, 0.7 parts of explosion-proof fiber with a diameter of 2.5 μm.

[0023] After the above-mentioned raw materials are uniformly mixed and stirred in a forced mixer, they are rammed and formed on the inner wall of the gasification furnace, and after natural solidification at 25 degrees Celsius for 8 hours, the ramming material is finally set and formed. The ramming material lining is heated at 7~9℃ / h to 540℃ in the oven process, and after holding for 16~18h, the aluminum chromium phosphate colloid forms P 2 O 5 -Al 2 O 3 -Cr 2 O 3 The composite rea...

Embodiment 3

[0026] Combine 65 parts of special grade silicon carbide, 10 parts of α-type silicon nitride, and 6 parts of zirconium corundum (using high-zirconium corundum, of which ZrO 2 The content of 40%), 6 parts of alumina powder (3um), 2.5 parts of silica powder (6um), 10 parts of 55% aluminum chromium phosphate aqueous solution, coagulant is 2 parts of active ρ-alumina and 0.4 parts of oxidation A mixture of magnesium, 1.5 parts of bismuth iodoxytan, 0.5 parts of explosion-proof fiber with a diameter of 2 μm.

[0027] After the above-mentioned raw materials are uniformly mixed and stirred in a forced mixer, they are rammed and formed on the inner wall of the gasification furnace, and after natural solidification in an environment of 30 degrees Celsius for 7 hours, the ramming material is finally set and formed. The ramming material lining is heated at 7~9℃ / h to 540℃ in the oven process, and after holding for 16~18h, the aluminum chromium phosphate colloid forms P 2 O 5 -Al 2 O 3 -Cr 2 O...

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Abstract

The invention relates to a silicon carbide ramming material high in abrasion resistance, which comprises the following components in part by weight: 55-78 parts of superfine silicon carbides, 5-15 parts of alpha type silicon nitrides, 5-10 parts of zirconium corundum, 1-7 parts of aluminum oxide powder and silicon dioxide powder, 9-13 parts of aluminum chromium phosphates, 0.5-5 parts of coagulation accelerators, 0-2.5 parts of iodine bismuth oxyiodide tannates and 0.3-0.7 parts of anti-explosion fibers, wherein the mixture of active rho-aluminum oxide and magnesium oxide is taken as the coagulation accelerators, and the diameter of the anti-explosion fibers is 1.5-2.5 microns. The silicon carbide ramming material high in abrasion resistance, which is provided by the invention, is high instrength after being naturally dried, is excellent in abrasion resistance at high temperature, is high in heat transfer coefficient, is low in linear contractibility rate and is long in service life.

Description

technical field [0001] The invention relates to a high wear-resistant silicon carbide ramming material, which is used for the wear-resistant lining of the water pipe wall of a gasification furnace and is applied in the fields of chemical industry and the like. Background technique [0002] Coal water slurry pressurized gasifier operates under high temperature, high pressure and strong reducing atmosphere, liquid acidic slag, accompanied by high-speed erosion of solid, liquid and gas, its gas components and coal ash slag components will affect the refractory lining Severe erosion and damage. And there are large temperature and pressure fluctuations when starting and stopping. These harsh conditions put forward higher requirements for lining refractory materials. At present, the silicon carbide ramming material imported from Germany used in the wear-resistant lining of the water pipe wall of the gasifier of the synthetic ammonia plant has a short service life of only 8,500 ho...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 周涛盈生才
Owner 上海皕涛耐火材料有限公司
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