Method and device for producing vanadium-nitrogen alloy

Abstract

The invention provides a method and a device for producing vanadium-nitrogen alloy, and belongs to the technical field of iron alloy production. The method comprises the following steps: evenly mixing and pressing vanadium pentoxide powder, carbon powder, ferric oxide powder and binder to a sphere according to a certain proportion; filling the pressed sphere into an intermediate frequency induction shaft furnace to react for 2 to 3 hours at a temperature of between 1,000 and 1,700 DEG C under a nitrogen atmosphere, and discharging the sphere; and cooling the sphere under the nitrogen atmosphere to obtain the vanadium-nitrogen alloy product which contains 76 to 81 percent of V, 10 to 21 percent of N, 1 to 9 percent of C, and 1 to 2 percent of Fe by weight and has apparent density no less than 3.5g / cm<3>. The device can realize continuous production of the vanadium-nitrogen alloy by a one-step method. The method and the device have the advantages of continuous production, high production efficiency, small investment of production devices and equipment, simple and compact process flow, high heat efficiency of the induction shaft furnace, online temperature control, sufficient utilization of reaction heat and energy-saving and environment-friendly process.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy production, in particular to a method and device for producing vanadium nitrogen alloy. Background technique [0002] 80%-90% of vanadium is used in the iron and steel industry. The main reason is that vanadium reacts with carbon and nitrogen to form refractory carbon and nitrides. These compounds can play a role in precipitation hardening and grain refinement in steel. Therefore, the vanadium-nitrogen alloy composed of vanadium carbide and vanadium nitride plays an increasingly important role in the production of vanadium-containing steel. Vanadium nitrogen alloys can be used in structural steel, tool steel, pipe steel, steel bars, general engineering steel and cast iron. Existing studies have shown that the addition of vanadium-nitrogen alloys to steel can improve the comprehensive mechanical properties of steel such as wear resistance, corrosion resistance, toughness, strength, ductility, h...

AI Technical Summary

Problems solved by technology

These methods have the following deficiencies: (a) the production process is a two-step method, i.e. a non-continuous production method

This method has the following disadvantages: (a) due to the limited microwave penetration (generally less than 5cm), the furnace is too large to cause uneven heating; Mutual heating leads to low microwave tube life and reduced thermal efficiency; (c) in the preparation process of vanadium nitride, due to the deepening of the reduction degree, the more metallic the reaction product is, the stronger the microwave reflection will be. , leading to insufficient reduction of the final product and high residual oxygen in the product

[0006] In short, the overall analysis of the vanadium-nitrogen alloy production methods disclosed at home and abroad has the following characteristics: (a) the process flow is to separate the carbothermal reduction and nitriding treatment, which is a discontinuous production, and the carbothermal reduction is divided into There are two steps of pre-reduction and final reduction, so the production cycle is longer, and the reaction cycle is basically 5 to 8 hours, or even longer; (b) the heating method is generally a combination of resistance heating and induction heating. Heating method, resistance heating equipment has slow heat transfer, large heat loss, and high power consumption cost of the product; (c) The cost of selected raw materials is high, and the ratio of raw material components is not clear

Images