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Method for producing vanadium trioxide

A technology of vanadium trioxide and production method, applied in vanadium oxide and other directions, can solve the problems of high temperature and high pressure recovery rate, high cost of reduction equipment, complex production process, etc., and achieves rapid response, is conducive to labor protection, and reduces environmental pollution. Effect

Inactive Publication Date: 2011-05-11
SICHUAN CHUANWEI GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technical solution is: the reduction time is as long as 10-20 hours
[0010] Japanese patent application 84 / 61141622 discloses to use high-valent vanadium oxide under ammonia atmosphere, under the condition of 0.1-1.5 atmospheric pressure and 450--650 ℃, reduction 1-6 hour, produces vanadium trioxide, the shortcoming of its method is : High temperature and high pressure, long reaction time, high cost of reduction equipment
[0013] In summary, the existing production process of vanadium trioxide has the following disadvantages: long reaction time, high reduction temperature, complex production process, high temperature and high pressure and low recovery rate, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Ammonium polyvanadate powder, carbon powder and dextrin are mixed in mixing cylinder (dextrin addition is 2% of ammonium polyvanadate weight, and carbon powder addition is 1.5% of ammonium polyvanadate weight), then make ball. The particle size distribution of the pellets is between 4 and 8 mm. The drying conditions for green balls are: drying temperature 120-140°C; drying time > 6h. The carbon-containing ammonium polyvanadate pellets are continuously added to the externally heated rotary kiln, and the industrial gas is fed into the rotary kiln in the opposite direction to the pellet movement direction. Through external heating, the high temperature zone in the rotary kiln reaches 500-650°C. Keep the temperature in the high temperature zone and maintain the reduction time for about 15 minutes. The pellets are decomposed and reduced to vanadium trioxide. The vanadium trioxide pellets are cooled to below 100° C. under the protection of argon and released from the furnac...

Embodiment 2

[0043] Ammonium polyvanadate powder, graphite powder, dextrin and starch are mixed in the mixing cylinder (dextrin and starch addition are respectively 1% of ammonium polyvanadate weight, and graphite powder addition is 1.5% of ammonium polyvanadate weight. %), and then pelletized. The particle size distribution of the pellets is between 4 and 8 mm. The drying conditions for green balls are: drying temperature 120-140°C; drying time > 6h. The carbon-containing ammonium polyvanadate pellets are continuously added into the fluidized furnace tube from the middle and upper part of the fluidized furnace tube, and industrial gas is introduced from the lower part of the fluidized furnace tube. Through external heating, the high temperature zone in the fluidized furnace tube reaches 500-650°C, keep warm in the high temperature zone and maintain the reduction time for about 10 minutes, and the pellets are decomposed and reduced to vanadium trioxide. The vanadium trioxide pellets are ...

Embodiment 3

[0046] Ammonium polyvanadate powder, graphite powder, dextrin and starch are mixed in mixing cylinder (dextrin and starch addition are respectively 1% of ammonium polyvanadate weight, and graphite powder addition is 1.5% of ammonium polyvanadate weight ), and then make balls. The particle size distribution of the pellets is between 4 and 8 mm. The drying conditions for green balls are: drying temperature 120-140°C; drying time > 6h. The carbon-containing ammonium polyvanadate pellets are continuously added into the shaft furnace from the upper part of the shaft furnace, and industrial gas is introduced from the lower part of the shaft furnace. Through induction heating, the high temperature zone in the shaft furnace reaches 500-650°C, and the temperature is maintained in the high temperature zone and the reduction time is maintained for about 30 minutes. The pellets are decomposed and reduced to vanadium trioxide. The vanadium trioxide pellets are cooled to below 100° C. und...

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Abstract

The invention belongs to the chemical field, in particular to a method for producing vanadium trioxide, aiming at improving the reaction speed of the method for producing vanadium trioxide and providing a solution as follows: A. raw material preparation; B. reduction of the prepared raw material by using reducing gas; and C. obtaining vanadium trioxide after reduction. The improvement of the method in the invention is that the used raw material in step A is composed of binder, carbon powder and vanadium-containing material, wherein the vanadium-containing material is ammonium vanadate or vanadium pentoxide. The invention adopts the technologies of carbon-proportioning and pellet preparation aiming at the raw material to enable the raw material to react in a gas-solid bi-phase reducing agent formed by solid carbon powder and reducing gas, thus improving the reduction reaction speed, enhancing recovery rate of the vanadium, and reducing consumption of the reducing gas. The produced pellet has the advantages of improving reaction speed, avoiding and reducing volatilization of vanadium-containing powder material, protecting environment and being beneficial for labor protection.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for producing vanadium trioxide. Background technique [0002] Vanadium trioxide is a reducing agent for smelting ferro-vanadium alloys or other vanadium alloys, such as vanadium-nitrogen alloys and high-vanadium iron. When using it to smelt ferrovanadium, the production cost can be reduced and the recovery rate of vanadium can be increased. Using it to prepare vanadium-nitrogen alloy can increase the reaction speed and improve the quality of vanadium-nitrogen alloy products. The production methods of vanadium trioxide can be roughly classified into two types: one is ammonium vanadate pyrolysis cracking method without adding reducing agent; the other is direct reduction method adding reducing agent. The main preparation methods are as follows: [0003] (a) Ammonium vanadate pyrolysis cracking method without additional reducing agent [0004] Japanese Pate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02
Inventor 张力帅兴国蒲年文韩庆黄斌吴文东谢建国张鹏
Owner SICHUAN CHUANWEI GRP CO LTD
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