Building process of furnace bottom of electric furnace

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 involves the masonry process in the field of metallurgy. Specifically, it is a masonry process at the bottom of the electric furnace. Background technique [0002] Due to the pressure of cost, domestic electric furnaces are generally improving the heatfall ratio of iron and water supply and oxygen supply.This measure has indeed achieved the purpose of shortening the smelting cycle, reducing comprehensive energy consumption, and reducing production costs, but it also brings a series of problems.First of all, with the increase of the ratio of iron and water, the intensity of the carbon oxygen reaction in the molten pond also increased, the steel liquid surface increased, and the phenomenon of running steel in the furnace door increased.It increases the difficulty of smelting smoothing; secondly, the carbon oxygen reaction mostly starts from the bottom of the furnace. The greater intensity of its reaction has also caused an increase in erosion at...

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