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Production of vanadium nitride by industrial mcirowave oven

An industrial microwave oven and vanadium nitride technology, applied in chemical instruments and methods, nitrogen-metal/silicon/boron binary compounds, vanadium compounds, etc., can solve the problem of thermal insulation materials, refractory materials and sagger loss, product brand cost rate Low temperature, uneven heating of materials, etc., to improve production efficiency and equipment utilization, shorten production cycle, and achieve good product consistency

Inactive Publication Date: 2005-07-27
长沙隆泰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the existing vanadium nitride production technology, documents US4040814, "Iron and Steel Vanadium and Titanium" (Wang Gonghou et al., 1988 (2): 19), "Rare Metals" (Lu Zhiyu et al., 2003 (27): 193), "Iron and Steel Vanadium and Titanium "(Xu Xianfeng et al., (24): 46), "Journal of alloys and Compounds" (P.K.Tripathy et al., 1994: 175-180) respectively recorded that the conventional production process of vanadium nitride by carbothermal reduction is generally vacuum, intermittent Type production has the defects of large equipment investment, complicated operation, long production cycle and low labor efficiency
The document GB1318467 is produced by using a gas reducing agent, and its disadvantage is that the utilization rate of the reducing agent is low and the product is powdery; the document CN1422800A adopts the conventional heating pushing plate pit or tunnel pit where the atmosphere in the furnace is positive pressure, and the nitrogen that the material can continuously enter and exit the preparation furnace In the vanadium production process, the heating is realized by heat conduction formed by the temperature gradient. The material is heated unevenly and the process control is not precise, resulting in poor product consistency, unstable quality, serious loss of insulation materials, refractory materials and saggers, and products Brand cost rate is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: 2.79Kg of vanadium oxide powder containing 54.9% vanadium, 0.75Kg of carbon black, and 530mL of 4% polyvinyl alcohol-containing aqueous solution are mixed uniformly and pressed into blocks, and this block material is added to an industrial microwave oven, and simultaneously Nitrogen is introduced into the furnace to keep the pressure in the furnace at a positive pressure of 50-100Pa. The material is first heated up to 700°C at a rate of 250°C / h, and then reaches a maximum temperature of 1450°C at a heating rate of 300°C / h. After that, it is cooled to 200°C with the furnace. ℃ out of the oven. Obtained 1.92Kg vanadium nitride containing 79.2% V, 12.7% N, 3.34% C, 1.24% O, and its apparent density is 3.16g / cm 3 .

Embodiment 2

[0016] Example 2: Mix 2.3Kg of vanadium oxide powder containing 66.2% of vanadium, 0.57Kg of carbon black, and 430mL of 4% polyvinyl alcohol-containing aqueous solution and press it into a block. This block is added to an industrial microwave oven, and simultaneously Nitrogen is introduced into the furnace to keep the pressure in the furnace at a positive pressure of 20-50Pa. The material reaches a maximum temperature of 1450°C at a heating rate of 350°C / h, and is cooled to 150°C with the furnace. Obtained 1.92Kg vanadium nitride containing 77.0% V, 15.4% N, 1.53% C, 0.59% O, and its apparent density is 5.01g / cm 3 .

Embodiment 3

[0017] Example 3: 2.79Kg of vanadium oxide powder containing 54.9% of vanadium, 0.81Kg of carbon black, and 540mL of 4% polyvinyl alcohol-containing aqueous solution are mixed uniformly and pressed into blocks, and the block materials are added to an industrial microwave oven, and simultaneously 95% N into the furnace 2 and 5%H 2 The mixed gas keeps the pressure in the furnace at a positive pressure of 50-100Pa, and the material reaches a maximum temperature of 1500°C at a heating rate of 300°C / h, and then is cooled to 250°C with the furnace and released from the furnace. Obtained 1.94Kg vanadium nitride containing 78.7% V, 13.1% N, 4.16% C, 0.95% O, and its apparent density is 2.87g / cm 3 .

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Abstract

Production of vanadium nitride by industrial microwave oven is carried out by mixing vanadium oxide, carbon powder with binder by proportioning, pressing into blanking block, putting them into industrial microwave oven, heating synthesizing with furnace pressure 1 atm-1 atm+500Pa, highest reacting temperature 1000deg.C-1800deg.C, reacting for 0.2-6hrs, cooling the material below 300deg.C, and drawing charge. Its advantages include simple heating process, low cost, short production period and easy control.

Description

technical field [0001] The invention relates to a method for producing metallurgical additive vanadium nitride. Background technique [0002] In the existing vanadium nitride production technology, documents US4040814, "Iron and Steel Vanadium and Titanium" (Wang Gonghou et al., 1988 (2): 19), "Rare Metals" (Lu Zhiyu et al., 2003 (27): 193), "Iron and Steel Vanadium and Titanium "(Xu Xianfeng et al., (24): 46), "Journal of alloys and Compounds" (P.K.Tripathy et al., 1994: 175-180) respectively recorded that the conventional production process of vanadium nitride by carbothermal reduction is generally vacuum, intermittent Traditional production has the defects of large equipment investment, complicated operation, long production cycle and low labor efficiency. The document GB1318467 is produced by using a gas reducing agent, and its disadvantage is that the utilization rate of the reducing agent is low and the product is powdery; the document CN1422800A adopts the convention...

Claims

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Application Information

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IPC IPC(8): C01B21/06C01G31/00
Inventor 彭虎李俊
Owner 长沙隆泰科技有限公司
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