Building process of furnace bottom of electric furnace

A process and furnace bottom technology, applied in the field of metallurgy, can solve the problems of safety production threats, increase the consumption of steel materials, reduce the service life of the furnace shell, etc. Effect

Active Publication Date: 2013-04-24
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, with the increase of hot metal hot charging ratio and oxygen supply intensity, the intensity of carbon-oxygen reaction in the molten pool also increases, the liquid steel level rises, and the phenomenon of steel running out of the furnace door increases, which not only increases the consumption of steel materials, but also It increases the difficulty of smelting in a smooth manner; secondly, the carbon-oxygen reaction mostly starts from the bottom of the furnace, and the intensity of the reaction also increases the erosion rate of the working layer at the bottom of the electric arc furnace, which poses a threat to safe production
Furthermore, the intense carbon-oxygen reaction and the thinning of the working layer at the bottom of the furnace increase the temperature of the lower shell of the electric arc furnace, aggravate the denaturation, and reduce the service life of the furnace shell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of masonry technology of electric furnace bottom, carry out according to the following steps:

[0017] (1) Check the roundness of the furnace shell at the bottom of the furnace, make sure that the furnace shell has no obvious deformation, clean up the sticky slag and ash in the furnace shell, ensure that the ventilation holes are unblocked, and evenly apply a layer of butyl acrylate glue;

[0018] (2) At the joint between the furnace bottom and the furnace wall, two layers of nano-scale silicon dioxide or nano-scale aluminum oxide are pasted layer by layer on the furnace bottom in the direction of the furnace bottom. The thickness of each layer of nano-material reflective insulation board is 4.5 mm, the nanomaterial reflective heat insulation board should be pasted flat, firmly, evenly, and without holes, and the joints of the two layers of nanomaterial reflective heat insulation boards should be staggered;

[0019] (3) Lay two layers of magnesia bricks from bott...

Embodiment 2

[0023] A kind of masonry technology of electric furnace bottom, carry out according to the following steps:

[0024] (1) Check the roundness of the furnace shell at the bottom of the furnace, make sure that the furnace shell has no obvious deformation, clean up the sticky slag and ash in the furnace shell, ensure that the ventilation holes are unblocked, and evenly apply a layer of butyl acrylate glue;

[0025] (2) At the joint between the furnace bottom and the furnace wall, two layers of nano-scale silicon dioxide or nano-scale aluminum oxide are pasted layer by layer on the furnace bottom in the direction of the furnace bottom. The thickness of each layer of nano-material reflective insulation board is 5 mm, the nanomaterial reflective insulation board should be pasted flat, firmly, evenly, and without holes, and the joints of the two layers of nanomaterial reflective insulation boards should be staggered;

[0026] (3) Lay two layers of magnesia bricks from bottom to top ab...

Embodiment 3

[0030] A kind of masonry technology of electric furnace bottom, carry out according to the following steps:

[0031] (1) Check the roundness of the furnace shell at the bottom of the furnace, make sure that the furnace shell has no obvious deformation, clean up the sticky slag and ash in the furnace shell, ensure that the ventilation holes are unblocked, and evenly apply a layer of butyl acrylate glue;

[0032] (2) At the joint between the furnace bottom and the furnace wall, two layers of nano-scale silicon dioxide or nano-scale aluminum oxide are pasted layer by layer on the furnace bottom in the direction of the furnace bottom. The thickness of each layer of nano-material reflective insulation board is 5.5 mm, the nanomaterial reflective heat insulation board should be pasted flat, firmly, evenly, and without holes, and the joints of the two layers of nanomaterial reflective heat insulation boards should be staggered;

[0033] (3) Lay two layers of magnesia bricks from bott...

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Abstract

The invention relates to the building process in metallurgical field and provides a building process of a furnace bottom of an electric furnace. The process comprises the following steps: examining the roundness of a furnace bottom and a furnace shell, confirming that the furnace shell has no obvious deformation and cleaning off slag adhesion and ash deposition in the furnace shell so as to ensure an air hole unblocked, coating a layer of glue evenly; at the junction of the furnace bottom and the furnace wall, pasting two layers of nano material reflective heat insulating boards layer by layer in the direction of the furnace bottom, wherein the reflective heat insulating boards are used as a heat insulating material layer, the thickness of each layer of reflective heat insulating board is5mm, the nano material reflective heat insulating boards need to be pasted flatly, solidly and orderly without cavities, joints of the two nano reflective heat insulating boards need to be staggered;flatly laying two layers of magnesite bricks above the heat insulating material layer, and filling brickwork joints with fine magnesite, wherein each layer of magnesite brick is 76mm thick; laying a layer of magnesia carbon bricks with the tickness of 150mm, and filling brickwork joints with fine magnesite; paving bottom ramming material with the thickness of 650mm above the magnesia carbon bricks, and ramming the bottom ramming materials by a ramming machine to ensure the surface fastness and form a pot-bottom-shaped furnace bottom. The process provided by the invention can ensure controllable reaction between carbon and oxygen, increase a furnace heath and improve the heat insulation effect of the furnace bottom of an arc furnace.

Description

technical field [0001] The invention relates to a masonry process in the field of metallurgy, in particular to a masonry process for the bottom of an electric furnace. Background technique [0002] Due to the pressure of cost, domestic electric furnaces are generally increasing the ratio of hot metal hot charging and oxygen supply intensity. This measure has indeed achieved the purpose of shortening the smelting cycle, reducing overall energy consumption and reducing production costs, but it also brings a series of problems. First of all, with the increase of hot metal hot charging ratio and oxygen supply intensity, the intensity of carbon-oxygen reaction in the molten pool also increases, the liquid steel level rises, and the phenomenon of steel running out of the furnace door increases, which not only increases the consumption of steel materials, but also It increases the difficulty of smelting and going forward; secondly, the carbon-oxygen reaction mostly starts from the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D1/16
Inventor 周剑
Owner NANJING IRON & STEEL CO LTD
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