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Preparation method of vanadium nitride

A vanadium nitride and vanadium oxide technology, applied in chemical instruments and methods, nitrogen-metal/silicon/boron binary compounds, vanadium compounds, etc., can solve problems such as low N content, difficult production and use, and achieve production High efficiency, long service life and small temperature gradient

Inactive Publication Date: 2013-02-06
CNMC NINGXIA ORIENT GRP
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Some of the above methods require high temperatures above 1800°C, some have special requirements for raw materials, some have low N content, and there are many difficulties in production and use.

Method used

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  • Preparation method of vanadium nitride
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preparation example Construction

[0032] The preparation process of vanadium nitride is:

[0033] Powdered vanadium oxide (V 2 o 5 , V 2 o 3 , NH 4 VO 3 or one or any mixture of ammonium polyvanadate) and carbonaceous reducing agent (one or more of carbon black, graphite, activated carbon, pitch and petroleum coke) are mixed according to the weight ratio of 3.4-3:1 , adding a binder with a concentration of 2.0-3.0% (one or more of starch, polyvinyl alcohol, acrylic resin, sucrose, and cellulose) in an amount of 8-25% (percentage by weight), and mixing evenly; then Pressed into diamond-shaped blocks with a size of 45mm×455mm×35mm, the pressing pressure is controlled at 100-150Mpa, the compression ratio is 1.8-2.3; oven drying, the temperature is 100-250°C, and the time is 8-24 hours; after drying, add graphite The crucible is sent into the double-channel pusher kiln. The dual-channel pusher kiln adopts nitrogen protection, and a sealed chamber and a cleaning chamber are designed at the entrance and exit ...

Embodiment 1

[0036] Mix 1000kg of vanadium pentoxide powder and 325kg of carbon black, add polyvinyl alcohol aqueous solution with a concentration of 2.5%, the solution ratio is 8%, after mixing evenly, briquette under a pressure of 120Mpa, the material compression ratio is 1.8, and dry at 125°C for 12 hours , and then put the molded and dried material in the feeding bin of the pusher kiln. The material is controlled by PLC, and the material is automatically circulated in and out of the pusher kiln. At the same time, nitrogen is introduced into the pusher kiln to keep the kiln pressure above the atmospheric pressure of 10- 100pa, the material is kept at 1500°C for 6 hours, cooled to 1200°C for 2 hours for nitriding treatment, and then continues to cool to 120°C to be automatically released from the furnace, and the content is 78.32%V, 15.2%N, 4.7%C, 0.83% O, 0.01% S vanadium nitride, its product density is 3.8g / cm 3 .

Embodiment 2

[0038] Mix 1000kg of vanadium pentoxide and 335kg of carbon black evenly, add polyvinyl alcohol aqueous solution with a concentration of 2%, the solution ratio is 15%, after mixing evenly, briquette under a pressure of 150Mpa, the material compression ratio is 2.0, and dry at 150°C for 12 hours , and then put the molded and dried material in the feeding bin of the pusher kiln. The material is controlled by PLC, and the material is automatically circulated in and out of the pusher kiln. At the same time, nitrogen is introduced into the pusher kiln to keep the kiln pressure above the atmospheric pressure of 10- 100pa, the material is kept in the temperature range of 1480°C for 6h, cooled to 1200°C for 2h for nitriding treatment, and then continued to cool to 120°C to be automatically released from the furnace, and the content is 78.22%V, 13.8%N, 5.9%C, 0.72% O, 0.01% S vanadium nitride, its product density is 3.8g / cm 3 .

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Abstract

The invention relates to a preparation method of vanadium nitride. The preparation method comprises the following steps: uniformly mixing powdered vanadium oxide, a carbonaceous reducing agent and a binding agent aqueous solution; compacting to prepare into blocks; drying the block materials; continuously adding in a double-channel push plate kiln; carrying out reduction, sintering, nitrogenization and cooling in each temperature region in the kiln under the condition of 10Pa to 100Pa of pressure in the kiln and gas protection; and finally producing the vanadium nitride product with contents of 77-80% of V (vanadium), 11-18% of N (nitrogen) and 2-8% of C (carbon), and production density of 3.2g / cm<3> to 4.1g / cm<3> is obtained. With the adoption of the preparation method provided by the invention, the continuous production is achieved, and the preparation method has the following advantages of stable technology process, high production efficiency, high reducing efficiency, low reaction temperature, high heating efficiency, low energy consumption and so on.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal metallurgy, in particular to a method for preparing vanadium nitride. Background technique [0002] Vanadium is an important alloying element in steel production, and it is widely used in low microalloyed steels. Studies have shown that adding vanadium to steel can significantly increase the strength of steel. For example, adding vanadium to steel can increase the yield strength from 350MPa to more than 600MPa. Vanadium-containing steel not only improves the strength, but also improves the comprehensive properties such as thermal fatigue resistance and weldability. The compounds produced by the reaction of vanadium with carbon and nitrogen play a role in precipitation hardening and grain refinement in steel. The traditional method of adding vanadium is to add ferrovanadium into molten steel. However, a large number of recent studies and practices have shown that if vanadium is added to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06C01G31/00
Inventor 丁华南张创奇钟景明李彬刘松林赵德强孙万银陈虎兵温晓立董银龙麻建军张阳张淼刘晓念
Owner CNMC NINGXIA ORIENT GRP
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