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Furnace bottom ramming material of RH refining furnace

A technology of ramming material and refining furnace, which is applied in the field of refractory materials for the bottom of RH refining furnace, can solve the problems of environmental pollution and human harm, and achieve the effects of excellent high temperature performance, promotion of sintering, and improvement of thermal shock stability.

Active Publication Date: 2014-12-03
洛阳利尔功能材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During use, the traditional magnesia-chrome ramming material will have the following disadvantages: Cr 2 o 3 The refractory materials in the oxidizing atmosphere and strong basic oxides such as Na 2 O, K 2 In the presence of O or CaO, trivalent chromium can be transformed into hexavalent chromium
Hexavalent chromium compounds are easily soluble in water, and CrO 3 Can exist in gaseous phase, harmful to human body and pollute the environment

Method used

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  • Furnace bottom ramming material of RH refining furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A RH refining furnace bottom ramming material, the weight percentage of each component in the raw material is: take 30% of large crystal fused magnesia with a particle size of 3~5mm, and 20% of large crystal fused magnesia with a particle size of 1~3mm %, 15% of large crystal fused magnesia with a particle size of 0~1mm, 15% of large crystal fused magnesia with a particle size of 200 mesh, 8% of magnesia-aluminum spinel with a particle size of 320 mesh, Al 2 o 3 Micropowder 3%, metal aluminum powder 7%, metal silicon powder 2%, and the mass of magnesium chloride as a binder is about 3% of the dry material mass. The above raw materials are mixed according to the ratio and mixed evenly in the forced mixer to make dry powder materials. When using, add appropriate amount of water and stir evenly.

Embodiment 2

[0037] A RH refining furnace bottom ramming material, the weight percentage of each component in the raw material is: take 33% of large crystal fused magnesia with a particle size of 3~5mm, and 22% of large crystal fused magnesia with a particle size of 1~3mm %, 10% of large crystal fused magnesia with a particle size of 0~1mm, 15% of large crystalline fused magnesia with a particle size of 200 mesh, 10% of magnesium aluminum spinel with a particle size of 320 mesh, active α-Al 2 o 3 4% micro powder, 4% metal magnesium powder, 2% metal silicon powder, plus 3% binder sodium silicate. The above raw materials are mixed according to the ratio and mixed evenly in the forced mixer to make dry powder materials. When using, add appropriate amount of water and stir evenly.

Embodiment 3

[0039] A RH refining furnace bottom ramming material, the weight percentage of each component in the raw material is: take 35% of large crystal fused magnesia with a particle size of 3~5mm, and 15% of large crystal fused magnesia with a particle size of 1~3mm %, 20% of large crystal fused magnesia with a particle size of 0~1mm, 10% of large crystal fused magnesia with a particle size of 200 mesh, 8% of magnesia-aluminum spinel with a particle size of 320 mesh, Al 2 o 3 Micropowder 4%, metal aluminum powder 6%, metal silicon powder 2%, and the quality of the binder sodium hexametaphosphate is 4% of the dry material. The above raw materials are mixed according to the ratio and mixed evenly in the forced mixer to make dry powder materials. When using, add appropriate amount of water and stir evenly.

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Abstract

The invention relates to a furnace bottom ramming material of an RH refining furnace. The furnace bottom ramming material consists of a dry material and an additional anchoring agent, wherein the dry material consists of the following components in percentage by weight: 70-80% of fused magnesite, 5-10% of magnesia-alumina spinel, 1-5% of Al2O3 micro-powder and 1-10% of metal powder, wherein the fused magnesite and the magnesia-alumina spinel are refractory aggregates, the Al2O3 micro-powder and the metal powder are refractory powder, the anchoring agent is an inorganic salt, and the addition amount of the anchoring agent is 1-5% of the weight of the dry material. A preparation method of the furnace bottom ramming material comprises the following steps: preparing various raw materials according to formula requirements, and preparing a dry-powder material in a forced stirring machine; putting the uniformly mixed material into a moisture-proof woven bag; storing and transporting the material at cool and dry places; and when the material is used, adding water and stirring. The furnace bottom magnesia-alumina spinel ramming material of the RH refining furnace, provided by the invention, reaches the same high-temperature performance and the same site construction conditions with a magnesium-chromite ramming material. The furnace bottom ramming material can replace the conventional magnesium-chromite ramming material and has strong environmental-friendliness property.

Description

technical field [0001] The invention relates to the technical field of refractory materials for the bottom of an RH refining furnace, in particular to a magnesium-aluminum-spinel carbon-free and environment-friendly ramming material of composite metal powder. Background technique [0002] Ramping material refers to the unshaped refractory material that is constructed by ramming (manual or mechanical) and hardened under the action of heating above normal temperature. The refractory ramming material is prepared from a high proportion of granular materials and a very low proportion of binders and other components, even all of which are composed of granular and powdery materials. material. Because the ramming material is mainly used in direct contact with the molten material, it is required that the granular and powdery materials must have high volume stability, compactness and corrosion resistance. [0003] The bottom of the RH refining furnace is composed of circulating pipe...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 孔祥魁李玉香余海涛徐兵崔庆阳李有奇毛小刚寇志奇
Owner 洛阳利尔功能材料有限公司
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