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Environmentally-friendly tundish dry material

An environmentally friendly, magnesia technology, applied in the field of refractory materials, can solve problems such as unfavorable clean steelmaking, environmental protection requirements, and environmental pollution, and achieve the effects of environmentally friendly construction, no environmental pollution, and low production costs

Inactive Publication Date: 2011-07-13
山东耐材集团中齐耐火有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a dry tundish material, which can solve the problems in the prior art that solid phenolic resin produces a large amount of harmful and irritating gas, pollutes the environment, is not conducive to clean steelmaking and environmental protection requirements, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Percentage by weight: fused magnesia 92%, rosin 3%, sodium metasilicate heptahydrate 2%, alumina fine powder 1%, boron glass 1%, silicon micropowder 1%; the particle size distribution of the dry material is 5 -3mm 5%, 3-0.088mm 70%, less than 0.088mm 25%.

[0029] The capacity of the ladle is 50 tons, and the steel pouring time for each furnace is 23-25 ​​minutes. After the film is hoisted, the dry material is filled with vibration and compacted, and the thickness of the working layer is 65 mm, and it is baked at 200-300 ° C for 3 hours. The use conditions are as follows: 1) No irritating and harmful gases are produced during baking, and the dry material has high release strength and no cracks. 2) The construction is simple and the package is easy to turn over. 3) The service life can reach more than 50 hours.

Embodiment 2

[0031] Percentage by weight: sintered magnesia 60.8%, forsterite 20%, rosin 5%, sodium metasilicate pentahydrate 5%, alumina fine powder 2%, boron glass 1%, silica powder 1%, phosphate option Sodium hexametaphosphate 0.2%; the particle size distribution of dry feed is 5-3mm 10%, 3-0.088mm 60%, less than 0.088mm 30%.

[0032] The capacity of the ladle is 60 tons, and the steel pouring time for each furnace is 25-28 minutes. After the film is hoisted, the dry material is filled with vibration and compacted, and the thickness of the working layer is 70 mm, and it is baked at 200-300 ° C for 3 hours. The usage conditions are as follows: 1) No irritating odor will be generated when the carbon-free environmental protection dry-type bag is baked; after the mold is released, the strength is high and there is no crack; the online baking bag is normal. 2) After pouring the steel, it was observed off-line, and it was found that the slag line erosion of the carbon-free and environmentally...

Embodiment 3

[0034] Percentage by weight: sintered magnesia 91.5%, rosin 4%, sodium metasilicate nonahydrate 2%, alumina fine powder 0.8%, boron glass 0.9%, silicon micropowder 0.7%, phosphate selection sodium tripolyphosphate 0.1% ; The particle size distribution of the dry material is 5-3mm 10%, 3-0.088mm 65%, less than 0.088mm 20%.

[0035] The capacity of the ladle is 50 tons, and the steel pouring time for each furnace is 23-25 ​​minutes. After the film is hoisted, the dry material is filled with vibration and compacted, and the thickness of the working layer is 60 mm, and it is baked at 200-300 ° C for 3 hours. The use conditions are as follows: 1) No irritating and harmful gases are produced during baking, and the dry material has high release strength and no cracks. 2) The construction is simple and the package is easy to turn over. 3) The service life can reach more than 50 hours.

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PUM

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Abstract

The invention provides an environmentally-friendly tundish dry material, which can solve the problems that a large number of harmful irritant gases generated by solid phenolic resin pollute the environment and are unfavorable for clean steelmaking and environmental friendliness and the like in the prior art. The tundish dry material comprises the following components in percentage by weight: 87 to 96 percent of at least one of magnesite and forsterite, 1 to 5 percent of rosin, 1 to 5 percent of hydrosilicate, 0 to 2 percent of alumina fine powder, 0 to 1 percent of boron glass, 0 to 1 percentof silica micropowder and 0 to 0.5 percent of phosphate. The rosin and the hydrosilicate serve as compound binders, and advantages of the two binders are combined, so that the baking demolding strength of the dry material can be equivalent to that of a resin-bonded dry material and a large number of eutectics which influence the high temperature property of the dry material cannot be introduced simultaneously; therefore, the dry material has the characteristics of environmental friendliness and long service life.

Description

technical field [0001] The invention relates to a refractory material, in particular to an unshaped refractory material, which is an environment-friendly tundish dry material. Background technique [0002] In recent years, with the rapid development of high-efficiency continuous casting steelmaking technology and the use of rapid nozzle replacement technology, the requirements for the working lining of the tundish are getting higher and higher. The working lining of the tundish has changed from silicon insulation boards to alkaline refractory materials mainly composed of magnesia, forsterite, and calcium-containing raw materials. Using a higher and higher proportion of dry material, the service life of the working lining of the tundish is getting higher and higher. [0003] At present, the tundish dry material combined with solid phenolic resin widely used in steel mills is a refractory material developed with magnesia as the main raw material, calcium-containing materials,...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 郭江华徐文相柳勇
Owner 山东耐材集团中齐耐火有限公司
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