Method for preparing nitrided ferrovanadium
A technology of ferrovanadium nitride and ferrovanadium powder, which is applied in the field of ferrovanadium nitride preparation, can solve the problems of complex production process, low apparent density, unfavorable absorption of alloy elements, etc., and meet the requirements of simplifying the operation process and reducing equipment Effect
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preparation example Construction
[0007] According to the preparation method of the ferrovanadium nitride of the present invention, the ferrovanadium powder is heated under a nitrogen atmosphere, and then cooled, wherein the heating process includes a preheating stage, a transition stage and a nitriding sintering stage, and the The heating temperature in the preheating stage is 400°C to lower than 800°C, the heating temperature in the transition stage is 800°C to lower than 1200°C, and the heating temperature in the nitriding sintering stage is 1200-1500°C.
[0008] According to the method provided by the present invention, the heating time of the preheating stage can be 4-8 hours, preferably 5-7 hours; the heating time of the transition stage is 3-7 hours, preferably 4-6 hours ; The heating time of the nitriding sintering stage is 8-12 hours, preferably 9-11 hours. Controlling the heating time of the preheating stage, the transition stage and the nitriding sintering stage within the above range can further in...
Embodiment approach
[0014] According to a preferred embodiment of the present invention, the preparation method of the ferrovanadium nitride is implemented in a push plate type tunnel kiln. In this case, by properly controlling the temperature in different sections of the push plate type tunnel kiln, the continuous preparation of ferrovanadium nitride can be realized, thereby greatly improving the production efficiency of ferrovanadium nitride.
[0015] The present invention will be further described below through examples, but the protection scope of the present invention is not limited thereto.
[0016] In the following examples, the nitrogen content and vanadium content in the ferrovanadium nitride product and the apparent density of the ferrovanadium nitride product are measured according to the GB / T 20567-2006 method.
Embodiment 1
[0018] This example is used to illustrate the preparation method of the ferrovanadium nitride provided by the present invention.
[0019] The ferrovanadium powder (wherein, the vanadium content is 81.1% by weight, the iron content is 17.7% by weight, the aluminum content is 0.7% by weight, and the balance is carbon, silicon, etc.) with a particle size of 15-25 mm is packed into a graphite crucible, Each graphite crucible is filled with 5 kg. These graphite crucibles are then sent into the pusher type tunnel kiln, and according to the temperature difference of different sections in the pusher type tunnel kiln, the pusher type tunnel kiln is divided into a preheating section, a transition section, a nitriding sintering section and a cooling section. Feed nitrogen into the push plate type tunnel kiln to make the ferrovanadium powder in the graphite crucible be heated successively in the preheating section, transition section and nitriding sintering section under nitrogen atmosphe...
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Abstract
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