Method for preparing nitrided ferrovanadium alloy
A nitriding reaction technology of vanadium-iron alloy, applied in the field of preparing vanadium-iron alloy, can solve the problems of complicated process and low nitrogen content, achieve simple process, reduce the content of impurity elements, and improve the effect of purity
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Embodiment 1
[0041] (1) Weigh 95.6g of vanadium trioxide, 27.6g of graphite and 35g of iron powder, and grind them to a particle size of 100-200μm. Put the above-mentioned materials in a mixer and mix them into a cake press to form a block , The pressure is 12MPa;
[0042] (2) Put the bulk material obtained in step (1) into a pusher kiln after drying and sieving for firing. The preheating stage temperature is 500°C and the time is 5h. The carbonization reaction stage temperature is 900°C and the time is 6h, then pass in nitrogen, control the nitrogen flow to 250m 3 / h, the temperature is increased to 1400℃ for the first nitridation reaction, after 10h, the temperature is reduced to 1200℃ for the second nitridation reaction, and the nitrogen flow rate is controlled to 350m 3 / h, after 12 hours of reaction, cooling (the shell of the pusher kiln is equipped with a water cooling jacket) to obtain a vanadium iron nitride alloy, the upper temperature of the cooling section is 800℃, and the lower tem...
Embodiment 2
[0045] (1) Weigh 95.6g of vanadium trioxide, 25.3g of graphite and 30g of iron powder, and grind them to a particle size of 100-200μm. Put the above-mentioned materials in a mixer and mix them into a cake press to form a block , The pressure is 13MPa;
[0046] (2) Put the bulk material obtained in step (1) into a pusher kiln after drying and sieving for firing. The preheating stage temperature is 500°C and the time is 5h. The carbonization reaction stage temperature is 900°C and the time is 6h, then pass in nitrogen, control the nitrogen flow to 250m 3 / h, the temperature is increased to 1450℃ for the first nitridation reaction, after holding for 11h, the temperature is lowered to 1250℃ for the second nitridation reaction, while controlling the nitrogen flow rate to 400m 3 / h, after 13 hours of reaction, cooling (the shell of the pusher kiln is equipped with a water cooling jacket) to obtain a vanadium iron nitride alloy, the upper temperature of the cooling section is 800℃, and t...
Embodiment 3
[0049] (1) Weigh 95.6g of vanadium trioxide, 32.2g of graphite, and 30g of iron powder, and grind them to a particle size of 100-200μm. Put the above-mentioned materials in a mixer and mix them into a cake press to form a block , The pressure is 15MPa;
[0050] (2) The block material obtained in step (1) is dried and sieved and then put into a pusher kiln for firing. The temperature in the preheating stage is 500℃ and the time is 5h. The temperature in the carbonization reaction stage is 850℃ and the time is 6h, then pass in nitrogen, control the nitrogen flow to 150m 3 / h, the temperature is raised to 1300℃ for the first nitridation reaction, after 10h the temperature is reduced to 1200℃ for the second nitridation reaction, and the nitrogen flow rate is controlled to 350m 3 / h, after 11 hours of reaction, cooling (the shell of the pusher kiln is equipped with a water cooling jacket) to obtain a vanadium iron nitride alloy, the upper temperature of the cooling section is 850℃, and...
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