Block-forming method of vanadium nitride powder

Abstract

A block-forming method of vanadium nitride powder comprises the following steps that vanadium nitride powder is mixed with vanadium-aluminum alloy and B2O3, in the nitrogen atmosphere, the mixture isfired for 4-6 hours at the temperature of 1000-1200 DEG C, and blocky vanadium nitride can be obtained after discharging. According to the block-forming method of the vanadium nitride powder, due to addition of a small amount of B2O3, the firing temperature can be lowered, and researches show that the block-forming performance of the vanadium nitride is better; if the addition amount of the B2O3 is excessively low, the block-forming performance is poor, and the firing time needs to be long; if the addition amount of the B2O3 is excessively high, excessive B element is introduced, the performance of the final product is influenced; the firing temperature is lower than the production temperature of the vanadium nitride, and the reaction time is only 4-6 h and is greatly shorter than 15-24 hneeded by production of the vanadium nitride; and the block-forming method of the vanadium nitride powder has the beneficial effects that the vanadium-aluminum alloy is adopted to perform a reaction at a high temperature and then used as a binder, blocky vanadium nitride can be obtained, the technology is simple, and cost is low.

Description

technical field [0001] The invention belongs to the field of vanadium metallurgy, in particular to a method for forming blocks of vanadium nitride powder. Background technique [0002] Vanadium nitride powder is the granular and powdery finished vanadium nitride that does not meet the minimum particle size requirements of the product after crushing, screening, and packaging in the production process of vanadium nitride. The reason for the vanadium nitride powder is that on the one hand, the green ball contains powder and debris, which will produce powder after firing; Powder. In the current situation, the amount of vanadium nitride powder produced during the production of vanadium nitride is relatively large. Generally, the proportion of powder in vanadium nitride products is 3-15wt%, and the best indicator is about 2wt%. As an alloying alloy for steelmaking, if the vanadium nitride powder is directly applied to steelmaking, a large amount of powder will be discharged with...

AI Technical Summary

Problems solved by technology

[0004] As a vanadium alloy, vanadium nitride has the characteristics of high hardness and no ductility. The powder particles cannot be formed by pressure, and the conventional binder cannot bond the powder to the ball under the premise of ensuring product quality, thus As a result, the vanadium nitride powder cannot be directly pressure-formed into a block

At present, some manufacturers use the method of adding vanadium nitride powder to the vanadium nitride raw material in a certain proportion and remixing the ball to consume vanadium nitride powder, which can achieve the purpose of consuming vanadium nitride powder to a certain extent. However, there are many problems in this method: (1) Increased cost: re-pressing the ball is equivalent to re-firing the finished product, resulting in secondary energy waste, and at the same time reducing the output of the finished product; (2) affecting the product table Improve the quality and increase the amount of powder: powder and

If the above method is used, it should be possible to effectively consume vanadium nitride powder, but this method also has some shortcomings: (1) requires separate equipment, sites, etc., and requires a large investment; The particle size composition and powder fluidity of vanadium powder are relatively strict, and the required processing cost is high

[0007] CN104120330A discloses a method for agglomerating vanadium nitride powder, but the cost of high ferrovanadium added in the method is high, and the firing temperature is high