Method for evenly prolonging service life of electric furnace used for smelting ferrovanadium by electro-silicothermic process

Abstract

The invention relates to a method for evenly prolonging the service life of an electric furnace used for smelting ferrovanadium by the electro-silicothermic process, belonging to the technical field of ferrovanadium metallurgy production. The technical solution is as follows: after naked molten iron is discharged normally at the end of ferrovanadium smelting in each furnace, regular online hot patching is carried out for a furnace lining on the inner lateral wall of the electric furnace; low-valence-state vanadium oxide is evenly paved on the bottom of the furnace to finish the hot patching for the bottom of the furnace, the etched part on the bottom of the furnace is repaired via solidification of the low-valence-state vanadium oxide with slag and molten iron mixture on the bottom of the furnace, and protection of the furnace during smelting is achieved via the physicochemical heat isolation effect of the low-valence-state vanadium oxide; and the service life of the electric furnace used for smelting ferrovanadium by the electro-silicothermic process is evenly prolonged via the simultaneous repair of both the wall of the furnace and the bottom of the furnace. In the invention, by utilizing the high-melting-point characteristic of the low-valence-state vanadium oxide, during the smelting process, not only the bottom of the furnace is repaired, but also the bottom of the furnace is protected during the process; while prolonging the service life of the furnace, the yield of vanadium is improved as the dose of reductant silicon iron and slag former quick lime is reduced, the production capacity of a single furnace is increased, the cost is reduced, and the waste emission is reduced.

Description

technical field [0001] The invention relates to a method for evenly prolonging the service life of an electric furnace for ferro-vanadium smelting by electrosilithermal method, and belongs to the technical field of ferro-vanadium metallurgy production. Background technique [0002] Ferrovanadium is an important alloy additive for iron and steel products. It is usually produced by electrosilicothermal method, aluminothermic method and electroluminothermic method; the electrosilicon thermal method is used to smelt ferrovanadium by heating in an electric arc furnace, and using ferrosilicon as a reducing agent to reduce five Production of (middle) ferrovanadium from vanadium oxide. This method is widely used in the industry due to its good production continuity, high product stability, high vanadium yield, good product quality and low cost. However, when ferrovanadium is smelted by electrosilicothermal method, there are also some technological deficiencies, among which the low ...

AI Technical Summary

Problems solved by technology

However, the furnace bottom cannot be repaired by online repairing method like the furnace wall. This is because: (1) There will be residual slag molten iron in the furnace bottom after each furnace is tapped. If it is directly repaired at high temperature, the water content will It is easy to cause safety accidents when the repair mud meets high-temperature slag molten iron; (2) There are usually slag and molten iron in the bottom of the furnace, and the repair mud cannot be well bonded to the furnace bottom. During the smelting process, the repair mud will be penetrated by the molten iron, float, lose protection

Images