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Magnesia-carbon wet-process spray coating and application method thereof

A technology of wet spray coating and application method, applied in the field of refractory materials, can solve the problems of short service life, limited construction conditions and high rebound rate, and achieve the effects of reducing the consumption of refractory materials, reducing labor consumption and improving production efficiency

Inactive Publication Date: 2020-08-25
SHANDONG KEXIN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, some manufacturers use the semi-dry method of spraying paint, feeding materials and repairing materials with high asphalt content. When using the semi-dry method of repairing materials, first add a small amount of water to make the materials wet, and use high-pressure air to send the wet materials to the spray gun. , further add water to the spray gun to mix, and spray it on the repaired surface. This method has the disadvantages of large dust, high rebound rate, waste of materials, low strength of the material, and short service life.
A large amount of asphalt is added to the large surface repair material. Due to the large amount of asphalt added, the asphalt decomposes at high temperature, and a large amount of black smoke, yellow smoke and pungent smell are produced, polluting the environment and affecting the health of operators.
Feed material is relatively good, but limited by construction conditions, it is difficult to repair the weak trunnion side lining of the ladle
[0004] Graphite carbon is not wetted with water, and adding it to the material will increase the amount of water added and reduce the strength, but graphite is resistant to oxidation and does not wet with high-temperature liquid slag liquid and metal liquid

Method used

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  • Magnesia-carbon wet-process spray coating and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Fused magnesia 80%Wt (200 mesh, including magnesia for preparing magnesium-carbon composite materials), carbon material 15%Wt (using pitch, graphite powder with a particle size of 325 mesh, and magnesia to prepare magnesia-carbon composite materials), bentonite 2.4 %Wt, water reducer (PC180 polycarboxylate water reducer) 0.2%Wt, sintering agent 2.4%Wt, etc. were pre-mixed to prepare dry mix; coagulant solution (including composite coagulant 10%Wt) was prepared separately. During spraying construction, mix the pre-prepared dry mixture with 4 to 6 times the mass of water as required to prepare a wet material. The wet material has good fluidity and has a storage capacity of more than 2 hours. Under the action of compressed air or booster pump, the wet material is transported to the spray gun through the pipeline, and mixed with the coagulant at the nozzle of the spray gun. The wet material loses its fluidity within 1 minute, and has a high plastic viscosity, which can adhe...

Embodiment 2

[0027] Fused magnesia 90%Wt (200 mesh, including magnesia for preparing magnesium-carbon composite materials), carbon material 3.1%Wt (magnesia-carbon composite materials were prepared using pitch, graphite powder with a particle size of 325 mesh, and magnesia), and bentonite 3.4 %Wt, water reducer (PC180 polycarboxylate water reducer) 0.1%Wt, sintering agent 3.4%Wt, etc. were pre-mixed to prepare dry mix; coagulant solution (including composite coagulant 8%Wt) was prepared separately. During spraying construction, mix the pre-prepared dry mixture with 4 to 6 times the mass of water as required to prepare a wet material. The wet material has good fluidity and has a storage capacity of more than 2 hours. Under the action of compressed air or booster pump, the wet material is transported to the spray gun through the pipeline, and mixed with the coagulant at the nozzle of the spray gun. The wet material loses its fluidity within 1 minute, and has a high plastic viscosity, which c...

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Abstract

The invention belongs to the field of refractory materials, and particularly relates to a magnesia-carbon wet-process spray coating and an application method thereof, and the magnesia-carbon wet-process spray coating is prepared by treating graphite and magnesia and matching the treated graphite and magnesia with a high-efficiency water reducing agent. The magnesium-carbon refractory material is sprayed by using a wet process to perform hot-state repair and lining making on a steel ladle, so the defects of high dust content, high rebound rate, low material bonding strength and the like of semi-dry-process spraying are overcome, the whole lining can be maintained, the service life of the steel ladle is prolonged, the consumption of the refractory material is reduced, steelmaking productionefficiency is improved, and labor consumption is reduced.

Description

technical field [0001] The patent of the invention belongs to the field of refractory materials, and in particular relates to a magnesium-carbon wet spray coating and its application method. Background technique [0002] In 2019, China's crude steel output was 900 million tons, and China is the world's largest steel exporter. As an important equipment for steelmaking, ladle has always been valued by refractory technicians. The service life of the ladle directly affects the rhythm of steelmaking production, steel output, and refractory material consumption. At present, the domestic mainstream ladle lining materials are magnesia-carbon bricks, magnesia-calcium bricks and other magnesia-containing refractory materials, as well as bauxite spinel castables and corundum refractory materials. For the inspection and repair of ladles, maintenance has always been valued by steel mills and refractory manufacturers. How to improve the service life of the ladle, reduce the consumption...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/047C04B35/64B22D41/02
CPCB22D41/023C04B35/043C04B35/047C04B35/64C04B2235/3217C04B2235/3272C04B2235/3409C04B2235/349C04B2235/425
Inventor 吴永明柯占龙贺恒星申娟娟张兆路张继国田守信
Owner SHANDONG KEXIN NEW MATERIALS
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