Process for producing vanadium nitrate

A production method and technology of vanadium nitride, which are applied in chemical instruments and methods, nitrogen-metal/silicon/boron binary compounds, vanadium compounds, etc., can solve the problems of complicated operation, high equipment investment, and narrow range of raw materials, etc. Wide source of raw materials, simplified process equipment, simple and effective process

Inactive Publication Date: 2005-03-02
CHANGZHOU MAOSHENGTE ALLOY PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantages of the above-mentioned methods are: 1. A vacuum system is required, the equipment investment is high, and the operation is complicated
2. Batch production of one furnace by one furnace, long production period, low labor productivity and high production cost
[0011] 1. The range of raw materials used is narrow, only suitable for V 2 o 3 or V 2 o 3 with VO 2. Mixture of VO
[0012] 2. V 2 o 3 Raw materials are difficult to purchase and the price is high, and the investment cost of the pusher kiln or tunnel kiln is high, which is difficult for small and medium-sized enterprises to bear
[0013] 3. The nitrogen content of the produced vanadium nitride products is low (1-8%), which is difficult to meet the requirements of iron and steel enterprises for high nitrogen content
[0015] However, the above method for producing vanadium nitride powder cannot be applied to the steelmaking industry.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Mix 800kg of ammonium metavanadate containing 31.5% vanadium and 161.5kg of carbon powder into the rotary kiln, keep the negative pressure of Lamtm-45pa in the kiln, heat it to 680°C at a heating rate of 5°C / min, and move continuously After 3 hours, after natural cooling to below 100°C, 509.5kg of reduced materials were obtained. After the materials were pulverized, 91.0 kg of 4% polyvinyl alcohol aqueous solution was added to briquette them, and then the materials were loaded into a tray and added to a vertical tube kiln. Access to N 2 and NH 3 The mixed gas, the pressure in the furnace is Latm+50Pa, heated to 1580°C at a heating rate of 14.6°C / min, after 6 hours of movement in this temperature area, it will automatically drop to the cooling part, and the material will be discharged automatically when it is cooled below 100°C. V: 78.5%, N: 12.65%, C: 6.65%, O: 0.72%, S3 .

Embodiment 2

[0036] Mix 920kg of ammonium polyvanadate containing 36.65% vanadium and 174.8kg of carbon powder into the rotary kiln, keep the negative pressure of Lamtm-50pa in the kiln, heat up to 750°C at a heating rate of 6°C / min, and move continuously for 3 Hours, after natural cooling to below 100°C, 613kg of reduced materials were obtained. After the materials were pulverized, 98kg of 4% polyvinyl alcohol aqueous solution was added to briquetting, and the materials were loaded into the tray and added to the vertical tube kiln. Into N 2 and NH 3The mixed gas, the pressure in the furnace is Latm+55Pa, heated to 1460°C at a heating rate of 14°C / min, and automatically descends to the cooling part after moving in this temperature range for 6 hours, and the material is automatically discharged when it is cooled below 100°C, and the product containing V: 77.62%, N: 10.28%, C: 7.69%, O: 0.92%, S3 .

Embodiment 3

[0038] Mix 760kg of ammonium metavanadate and ammonium polyvanadate mixture containing 33.85% vanadium and 152kg of carbon powder into the rotary kiln, keep the negative pressure of Lamtm-80pa in the kiln, and heat it at a heating rate of 4°C / min. 630°C, continuous motion for 2.5 hours, after natural cooling to below 100°C, 547kg of reduced materials were obtained, after the materials were ground, 90kg of 4% polyvinyl alcohol aqueous solution was added to briquetting, and the materials were loaded into the tray and added to the stand In the type tube kiln, N 2 and NH 3 The mixed gas, the pressure in the furnace is Latm+70Pa, heated to 1650°C at a heating rate of 13°C / min, and automatically descends to the cooling part after moving in this temperature range for 6 hours, and the material is automatically discharged when it is cooled below 100°C, and the product containing V: 80.34%, N: 15.65%, C: 3.8%, O: 0.21%, S3 .

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Abstract

The production process of vanadium nitride as one kind of vanadium alloy additive including pre-treatment of mixing of ammonium vanadate powder and carbon powder in a rotary kiln at 600-800 deg.c and slight negative pressure for 2-3 hr; grinding the mixture, mixing with adhesive and pressing into block; treating the blocks inside nitrogen containing protective atmosphere in a vertical tubular kiln at 1100-1900 deg.c for 4-6 hr to produce carbonization and nitridation producing vanadium nitride; and cooling to below 100 deg.c and taking out. The vanadium nitride product contains V in 77-81 wt%, N in 9-16 wt%, C in 2-8 wt% and O in 0.2-1.0 wt% and has apparent density of 3-3.9 g/cu cm, and is suitable for use in making steel.

Description

technical field [0001] The invention relates to a production method of vanadium nitride, which is a vanadium alloy additive and can be used in structural steel, pipeline steel, steel bar, common industrial steel and cast iron. Background technique [0002] Vanadium nitride is an important vanadium alloy additive like ferrovanadium. Existing studies have shown that adding vanadium nitride and vanadium carbide to steel can improve the comprehensive mechanical properties of steel such as wear resistance, toughness, strength, hardness, ductility and fatigue resistance, and make the steel have good welding performance. Especially in high-strength low-alloy steel, the vanadium nitride alloy additive is more conducive to the precipitation of vanadium carbide and vanadium nitride in the steel, so as to strengthen and refine the grain more effectively. Compared with the use of vanadium iron, vanadium nitride Alloy additives can save 20-40% vanadium in high-strength low-alloy steel, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/06C01G31/00
Inventor 盛国大章兼培言方定
Owner CHANGZHOU MAOSHENGTE ALLOY PROD
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