Method for reducing residual vanadium content in ferrovanadium smelting slag

Abstract

The invention discloses a method for reducing the residual vanadium content in ferrovanadium smelting furnace slag and belongs to the technical field of metallurgy. A technical problem solved by the method is that the residual vanadium content in furnace slag of FeV80 smelting through an electro-aluminothermic process is relatively high. The method for reducing the residual vanadium content in theferrovanadium smelting furnace slag is that: with vanadium oxide as the main material, aluminum powder is added according to different aluminum distribution coefficients, and then iron particles andlime are added and evenly mixed to obtain the first, second and third batches of materials respectively, wherein the aluminum distribution coefficient ratio of the three batches of materials is (0.95-0.98):(0.98-1.02):(1.02-1.05); the first batch of materials are added into a smelting furnace for electrifying and arc striking smelting, the second batch of materials, the third batch of materials and refining materials are sequentially added in the smelting process, blowing refining is carried out after smelting is completed, and cooling is carried out after refining to obtain the furnace slag and ferrovanadium. The method effectively reduces the residual vanadium content in the smelting furnace slag, and can reduce the residual vanadium content in the furnace slag to 1.46%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for reducing the residual vanadium content in ferro-vanadium smelting slag. Background technique [0002] As an alloy additive, ferrovanadium is widely used in the production of vanadium-containing microalloyed steel products. Due to the strong affinity of elements such as vanadium, carbon and nitrogen, it can form corresponding compounds with them, which can refine the structure and grain of steel, increase Strength, weldability and wear resistance of steel. The existing iron-vanadium smelting method generally adopts the traditional straight furnace electric thermite method, and the V 2 o 3 , V 2 o 5 Raw materials such as iron particles and aluminum powder are mixed and put into the electric arc furnace for electric smelting to promote the reduction reaction, and a certain amount of refining material is added in the later stage of smelting to improve ...

AI Technical Summary

Problems solved by technology

[0005] The Vanadium Products Factory of Panzhihua Iron and Steel Vanadium and Titanium Co., Ltd. currently adopts the straight furnace electric thermite method to evenly mix aluminum to smelt FeV80. This process has the following problems in the smelting process: First, the slag reduction degree is not enough in the later stage of smelting, resulting in the production of vanadium oxide The residual vanadium content in the slag remains at 2.3% or even higher due to insufficient reduction; the second is that with the erosion of the furnace lining during the smelting process, high melting point MgO-CaO-Al is produced 2 o 3 In the ternary slag system, insufficient superheat occurs in the later stage, resulting in poor fluidity of slag and deterioration of mass transfer conditions. During the smelting time, vanadium oxides cannot contact and react with Al in time, resulting in a high residual vanadium content in the slag.