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A kind of method for preparing vanadium nitrogen alloy by rotary hearth furnace

A technology of vanadium nitrogen alloy and rotary hearth furnace, which is applied in the field of vanadium nitrogen alloy preparation in rotary hearth furnace, which can solve the problems of complex production process, high reaction temperature and high equipment requirements, and achieve strong operability, short production cycle and heat loss little effect

Active Publication Date: 2020-08-11
PANZHIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of the above-mentioned vanadium nitride alloys have complex production processes, long production cycles, high equipment requirements, relatively high reaction temperatures, and high energy consumption.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] with V 2 o 5 And coke as raw material, the raw material is V 2 o 5 10kg, coke 3.30kg, V 2 o 5 and coke are crushed into a powder sample with a particle size of less than 150 mesh, stirred evenly, polyvinyl alcohol (PVA) is selected as a binder, and pressed under a pressure of 10 MPa for 10 seconds to form a ball.

[0040] Put the pressed pellets into the rotary hearth furnace, set the rotation speed of the rotary hearth furnace to 40min / r, the temperature in the low temperature preheating zone of the rotary hearth furnace is 650°C, and the holding time is 5min. Then enter the high-temperature reduction zone for high-temperature carbothermal reduction and nitriding. The temperature of the high-temperature reduction zone is set at 1450 ° C, and the holding time is 30 minutes. ℃), the time is 5min to obtain vanadium nitrogen alloy. The nitrogen content in the obtained vanadium nitrogen alloy is 15.39%, the oxygen content is 0.31%, and the purity is greater than 98%. ...

Embodiment 2

[0042] with V 2 o 5 And graphite as raw material, the raw material is V 2 o 5 10kg, coke 3.30kg, V 2 o 5 and graphite crushed into a powder sample with a particle size of less than 150 mesh, stirred evenly, selected polyacrylamide (PAM) as a binder, and pressed under a pressure of 20MPa for 10s to form a ball.

[0043] Put the pressed pellets into the rotary hearth furnace, set the rotation speed of the rotary hearth furnace to 50min / r, the temperature of the low temperature preheating zone of the rotary hearth furnace to 650°C, and the holding time for 10min. Then enter the high-temperature reduction zone for high-temperature carbothermal reduction and nitriding. The temperature of the high-temperature reduction zone is set at 1550 ° C, and the holding time is 30 minutes. ℃), the time is 10min to obtain a vanadium nitrogen alloy. The nitrogen content in the obtained vanadium nitrogen alloy is 17.39%, the oxygen content is 0.26%, and the purity is greater than 98%.

Embodiment 3

[0045] with V2 o 5 And activated carbon as raw material, the raw material is V 2 o 5 10kg, coke 3.30kg, V 2 o 5 Crushed with activated carbon into a powder sample with a particle size of less than 150 mesh, stirred evenly, selected polyvinyl alcohol (PVA) as a binder, and pressed under a pressure of 15MPa for 8s to form a ball.

[0046] Put the pressed pellets into the rotary hearth furnace, set the rotation speed of the rotary hearth furnace to 80min / r, the temperature in the low temperature preheating zone of the rotary hearth furnace to 680°C, and the holding time for 15min. Then enter the high-temperature reduction zone for high-temperature carbothermal reduction and nitriding. The temperature of the high-temperature reduction zone is set at 1200 ° C, and the holding time is 50 minutes. ℃), the time is 15min to obtain vanadium nitrogen alloy. The nitrogen content in the obtained vanadium nitrogen alloy is 14.39%, the oxygen content is 0.35%, and the purity is greater ...

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Abstract

The invention provides a method for preparing a vanadium-nitrogen alloy through a rotary hearth furnace, and belongs to the field of material preparation. The method comprises the following steps of mixing and crushing a vanadium oxide and a carbonaceous reducing agent, and pressing the mixture into balls under the action of a binder so as to obtain a ball material; and putting the ball material into the rotary hearth furnace, introducing nitrogen into the rotary hearth furnace, carrying out high-temperature reaction, and cooling to obtain the vanadium-nitrogen alloy. According to the method,the vanadium-nitrogen alloy is prepared by utilizing the rotary hearth furnace, three regions (a low-temperature preheating zone, a high-temperature reduction zone and a cooling zone) working in the rotary hearth furnace are fully utilized, compared with the traditional mode of preparing the vanadium-nitrogen alloy through blast furnace reduction, the heat loss of preparation of the vanadium-nitrogen alloy is reduced by utilizing the rotary hearth furnace, the method has the advantages of being simple in process, high in operability and short in production period, the content of oxygen in thevanadium-nitrogen alloy prepared through the rotary hearth furnace is low, the influence of the oxygen content on the use performance of the vanadium-nitrogen alloy is reduced, and the service life ofthe vanadium-nitrogen alloy is prolonged.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method for preparing a vanadium-nitrogen alloy in a rotary hearth furnace. Background technique [0002] Vanadium nitride alloy is a new alloy additive that can replace ferrovanadium for the production of microalloyed steel. The addition of vanadium nitride alloy to steel can improve the comprehensive mechanical properties of steel such as strength, toughness, ductility and thermal fatigue resistance, and make the steel have good weldability. When the same strength is achieved, the addition of vanadium nitride saves 30-40% of the added vanadium, thereby reducing the cost. Vanadium nitride alloys can be used in structural steel, tool steel, pipe steel, steel bars and cast iron. The application of vanadium nitride alloy in high-strength low-alloy steel can effectively micro-alloy vanadium and nitrogen at the same time, promote the precipitation of carbon, vanadium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C29/16C22C35/00C22C1/05
CPCC22C1/055C22C1/056C22C29/16C22C35/00
Inventor 杨绍利朴荣勋马兰陈书锐
Owner PANZHIHUA UNIV
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