Slagging agent and method for prolonging the service life of electric silicothermal vanadium iron electric furnace lining

Abstract

The invention discloses a slag former and a method for prolonging service life of a furnace lining of a ferrovanadium electric furnace in an electro-silicothermic process. The slag former is heavy calcium oxide and magnesium-enriched light calcium oxide; according to the slag former and the method, the magnesium-enriched light calcium oxide is used for increasing content of magnesium oxide in furnace materials and original furnace slags; by improving components and physicochemical indexes of calcium oxide of the slag former added in a ferrovanadium melting process, chemical erosion and physical erosion of furnace slags and the furnace materials on the furnace lining in the ferrovanadium melting process are controlled and improved, so that loss of the furnace lining of the electric furnace in the ferrovanadium melting process can be radically controlled, and the aim of prolonging the service life of the furnace lining of the ferrovanadium electric furnace is fulfilled; together with the fettling technology, the service life of the furnace lining of the ferrovanadium electric furnace can be effectively prolonged. After the slag former and the method are adopted, the service life of the furnace lining of the 50 ferrovanadium electric furnace in the industry can be prolonged by more than one time, normally more than 200 furnaces can be used; moreover, the melting time and melting indexes in all stages can completely meet the production requirement.

Description

technical field [0001] The invention belongs to the technical field of ferro-vanadium metallurgy production, in particular to a slagging agent and a method for prolonging the service life of the lining of an electric silicon thermal method ferrovanadium electric furnace. Background technique [0002] Ferrovanadium is an important alloy additive required for the production of iron and steel materials. It is usually produced by electrosilicothermal method, aluminothermic method and electroluminothermic method; China's 50% ferrovanadium output accounts for more than 2 / 3 of the world's total, of which 80% More than % is produced by electric silicothermal method. Ferrovanadium smelting by electric silicon thermal method is based on vanadium oxide as raw material, ferrosilicon as reducing agent, and lime as slagging agent. It is produced by electric arc furnace heating and smelting in stages. Electrosilicothermal method is widely used in the industry due to its good production co...

AI Technical Summary

Problems solved by technology

[0005] At present, in conventional 50 ferro-vanadium smelting, metallurgical lime is made of heavy calcium oxide (bulk density 3.2g / cm 3 ), all the use of heavy calcium oxide has the following disadvantages: (1) Since the bulk density of heavy calcium oxide is greater than the density of molten slag (density 2.8g / cm3), part of the heavy calcium oxide will sink during the smelting process, During the smelting process, the furnace lining under the slag line will be scoured and chemically corroded, which will strengthen and reduce the life of the furnace body

(2) During the ferrovanadium smelting process, conventional binary alkalinity (calcium oxide / silicon dioxide) is usually used to make slag. The slag alkalinity is between 1.7 and 2.5, and the furnace lining is made of magnesium oxide with weak alkalinity. , under smelting conditions, the slag is easy to convert magnesium oxide and melt into the slag, which will cause severe chemical corrosion to the furnace lining

(3) The eroded and washed lining material is integrated into the furnace, which reduces the temperature of the material in the furnace, increases the amount of slag, and reduces the vanadium yield

However, this method is a passive protection method after the lining is eroded. It cannot control the lining erosion at the source and achieve the effect of prolonging the life of the lining.

The technology and method that can control the loss of the lining of the vanadium-iron electric furnace from the source and prolong the service life of the vanadium-iron furnace lining have not yet been found.

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