Method for continuously and efficiently producing vanadium-nitrogen alloy with high nitrogen content

Abstract

The invention discloses a method for continuously and efficiently producing vanadium-nitrogen alloys with high nitrogen content, which comprises mixing and pressing vanadium-containing raw materials, carbonaceous reducing agents, iron powder and binders into pellets to obtain pelletized materials; the pelletized materials Carrying out carbonization and reduction in a tunnel kiln to obtain carbonized materials; carrying out nitriding and reduction of the carbonized materials in a vertical kiln to obtain the vanadium-nitrogen alloy with high nitrogen content. In the carbonization and reduction stage, the method realizes solidification, shrinkage and shaping of the pellets in the tunnel kiln, which can suppress the adhesion phenomenon during the nitriding reduction reaction in the tunnel kiln and the intermediate frequency shaft furnace; It can be directly used as a heat source, so that the solidified vanadium carbide pellets can be heated evenly and have stable quality. This method does not require additional additives, so that the distribution of nitrogen flow in the furnace is more stable and uniform; the utilization efficiency of the shaft furnace hearth is improved, the retention time in the shaft furnace is shortened, and the production capacity of the shaft furnace is greatly improved. Reduced production costs.

Description

technical field [0001] The invention relates to a production method of vanadium-nitrogen alloy, in particular to a method for continuously and efficiently producing vanadium-nitrogen alloy with high nitrogen content. Background technique [0002] As an excellent steelmaking additive, vanadium-nitrogen alloy can significantly improve the comprehensive mechanical properties of steel such as wear resistance, corrosion resistance, thermal fatigue resistance, and weldability, and can eliminate the extension of inclusions. Studies have shown that increasing the nitrogen content of vanadium-nitrogen alloys can significantly enhance the effect of precipitation strengthening and grain refinement of vanadium elements, which can further improve the strength and welding of vanadium-containing steel while effectively saving the amount of vanadium and reducing production costs. and other performance. Therefore, under the premise of stable and high production, increasing the content of ni...

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Problems solved by technology

However, due to the inevitable adhesion of graphite block and coke block powder to the surface of the pellet during the reaction process, in addition to affecting the appearance of the finished product, it also increases the carbon content of the vanadium nitrogen alloy.

Graphite block, coke block and other additives have poor air permeability, which inhibits the formation of a stable and uniform nitrogen flow in the furnace and other factors, resulting in the upper limit of the nitrogen content of the vanadium-nitrogen alloy finished product using only the vertical kiln process is only about 17%

In addition, non-reactive materials such as graphite blocks and coke blocks occupy nearly half of the furnace volume, which greatly limits the unit output of the shaft kiln

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