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Production process for preparing high-nitrogen vanadium nitride by using vacuum furnace method

A production process and vacuum furnace technology, which is applied in the production process field of vanadium nitride production, can solve the problems of low equipment reliability, complex process, long production cycle, etc., and achieve stable production efficiency, accurate process control, and no environmental pollution. Effect

Inactive Publication Date: 2013-09-18
湘西自治州丰达合金科技有限公司
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Problems solved by technology

[0008] The main disadvantages of the current method of producing vanadium nitride are: slow reaction speed, long production cycle, low productivity, high energy consumption, complicated process, low reliability of equipment, poor controllability, and the product contains The nitrogen content is low, the general nitrogen content is about 7%--14%, it cannot be called high-nitrogen vanadium nitride, the impurity content is high, and the carbon content is between 4%--10%, which cannot satisfy customers' low demand for products. Carbon requirements, therefore, to study a high nitrogen vanadium nitride production method is a technical problem to be solved at present

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  • Production process for preparing high-nitrogen vanadium nitride by using vacuum furnace method

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Experimental program
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Embodiment 1

[0025] 1. Put 2.72 tons of high-purity vanadium pentoxide (V2O5 content ≥ 99.5%), 0.64 tons of reducing agent graphite powder, 0.48 tons of binder polyvinyl alcohol aqueous solution, and 0.2 tons of high-efficiency nitriding accelerator urea into the mixing equipment for Mixing, the total weight of the four materials is 4 tons, and the uniformly mixed materials are put into a four-column hydraulic press for compression molding. The shape of the pressed materials is a cylindrical cake of Φ50*30, and the materials are loaded into the conveying material trolley, each Put 1 ton on the car, put 4 cars for a total of 4 tons, push the 4 cars into the vacuum smelting furnace and seal it;

[0026] 2. Vacuumize the vacuum furnace to 50-100Pa, heat up to 800°C and keep it at this temperature for 3.5 hours to pre-reduce vanadium pentoxide and carbon, and then continue to heat up to 1300°C for 4 hours of deep reduction and carbonization, continuously filling nitrogen with a purity of more ...

Embodiment 2

[0031] 1. Put 4.08 tons of high-purity vanadium pentoxide (V2O5 content ≥ 99.5%), 0.96 tons of reducing agent graphite powder, 0.72 tons of binder polyvinyl alcohol aqueous solution, and 0.9 tons of high-efficiency nitriding accelerator urea into the stirring equipment for Mixing, the total weight of the four materials is 6 tons, and the uniformly mixed materials are put into the double-roller hydraulic forming machine for compression molding. The shape of the pressed materials is a 50*35*25 spherical shape, and the materials are loaded into the conveying materials Carts, each car puts 1.5 tons, puts 4 cars for a total of 6 tons, pushes 4 cars into the vacuum smelting furnace and seals them;

[0032]2. Vacuumize the vacuum furnace to 120Pa, heat up to 850°C and keep it at this temperature for 4 hours to pre-reduce vanadium pentoxide and carbon, and then continue to heat up to 1350°C for 6 hours of deep reduction and carbonization. During the process, nitrogen gas with a pur...

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Abstract

The invention discloses a production process for preparing high-nitrogen vanadium nitride by using a vacuum furnace method, and relates to a production process for producing a high-nitrogen vanadium nitride product in a vacuum resistance furnace by taking high-purity vanadium pentoxide powder as the raw material through a nitridation sintering method. According to the production process, the process procedures of reduction, nitridation and sintering are carried out in a vacuum furnace, so that the energy consumption is low, the process control is accurate, the production efficiency of the product is high and stable, and the environment is not polluted.

Description

technical field [0001] The invention relates to a production technology for producing vanadium nitride, in particular to a production technology for preparing high-nitrogen vanadium nitride by a vacuum furnace method. Background technique [0002] Vanadium nitride is an excellent steelmaking additive, which can be used in structural steel, tool steel, steel bar and cast iron, and can significantly improve the comprehensive properties of steel such as wear resistance, corrosion resistance, toughness, strength, hardness, ductility and thermal fatigue resistance. Mechanical properties, and make the steel have good weldability, and play the role of eliminating the extension of inclusions. The increase of nitrogen content in vanadium steel reduces the tendency of precipitates to grow and coarsen, and the particles of precipitates become finer, so that the effect of vanadium can be fully exerted. Especially in high-strength low-alloy steels, vanadium nitride has more effective pr...

Claims

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Application Information

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IPC IPC(8): C01B21/06
Inventor 王国宁刘汉勇李绍东杨家冬
Owner 湘西自治州丰达合金科技有限公司
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