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Method for preparing vanadium pentoxide through fluidization

A vanadium pentoxide and fluidization technology, which is applied in the field of vanadium pentoxide extraction, can solve the problems that the performance of manufacturing materials cannot meet the process requirements, it is not easy to realize, high energy consumption and high cost, and achieve continuous and automatic operation, ease of continuous and automated operation, and long equipment life

Active Publication Date: 2014-09-03
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the rotary kiln is usually used as the main equipment for producing vanadium pentoxide, but its service life is short. The fundamental reason is that the performance of the manufacturing materials cannot meet the process requirements, and the rotary kiln operates at high temperature under corrosive gas conditions. Broken due to excessive force
At the same time, the size of the rotary kiln is small, the production capacity is low, the gas utilization rate is low, the energy consumption and cost are high
In addition, the rotary kiln process requires relatively strict sealing in order to prevent possible gas leakage from the equipment, but due to manufacturing and installation factors, it is generally not easy to achieve in large-scale rotary kilns, which requires that the plant must maintain a good ventilation state , therefore, there are certain limitations in the production of vanadium pentoxide by rotary kiln

Method used

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  • Method for preparing vanadium pentoxide through fluidization
  • Method for preparing vanadium pentoxide through fluidization

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0055] Set the bulk specific gravity to 0.6g / cm 3 Ammonium vanadate (abbreviated as APV) is dried at 200°C to a moisture content of 1%, and then the APV is fed into the fluidized reaction furnace through the feeding screw, and the feeding amount is controlled at 220kg / h. Control compressed air pressure 80kPa, flow rate 100Nm 3 / h, so that the material forms a uniform flow field in the fluidized furnace. By controlling the temperature of the hot blast furnace at 650°C and the material outlet temperature at 520°C, good conditions are provided for the dehydration, deamination, and oxidative decomposition of ammonium vanadate. The reaction time was controlled at 10 minutes, and the generated vanadium pentoxide was cooled to 120° C. by compressed air to obtain the product. The vanadium pentoxide output is 160kg / h, V in the product 2 o 5 The content is 98.13% by weight, the content of Si is 0.15% by weight, the content of Fe is 0.05% by weight, the content of P is 2 O+K 2 O con...

example 2

[0057] Prepare powdery vanadium pentoxide according to the method of Example 1, the difference is that the feed rate is controlled at 300kg / h, the hot blast furnace temperature is at 700°C, and the material outlet temperature is at 550°C. And the yield of the obtained powdery vanadium pentoxide is 210kg / h, and the components in the product meet the requirements in GB3238-87.

example 3

[0059] Prepare powdery vanadium pentoxide according to the method of embodiment 1, difference is, feed rate is controlled at 400kg / h, and compressed air pressure is controlled at 90kPa, and hot blast stove temperature is at 750 ℃, and material outlet temperature is at 580 ℃. The reaction time of the material in the reaction furnace is controlled at 7 minutes; and the output of the obtained powdery vanadium pentoxide reaches 285kg / h, and the components in the product still meet the requirements in GB3238-87.

[0060] In sum, the method for producing vanadium pentoxide by fluidization of the present invention has the following advantages:

[0061] (1) It can suspend solid particles and flow, thus ensuring a smooth, efficient and sufficient fluidization reaction;

[0062] (2) Compared with the rotary kiln process in the prior art, the present invention has a simple structure and convenient on-site installation, and at the same time, because the fluidized reactor itself is fixed, ...

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Abstract

The invention provides a fluidized method for preparing vanadium pentoxide. The method comprises the following steps: using the first hot air to dry the ammonium vanadate, and controlling the water weight percentage in the ammonium vanadate to be ≤1%; adding the dried ammonium vanadate to a fluidized reaction furnace, Compressed air is provided in the reaction furnace to fluidize the ammonium vanadate; the temperature in the fluidization reaction furnace is controlled to 650-750 by providing the second hot air to the heat exchange unit arranged in the fluidization reaction furnace. °C; control the pressure in the fluidized reactor to 5-8kPa to generate vanadium pentoxide; discharge the vanadium pentoxide from the fluidized reactor, then cool and collect the vanadium pentoxide. The method of the invention has the advantages of high production efficiency, long equipment life, fast reaction speed, easy realization of continuous and automatic operation, and the like.

Description

technical field [0001] The invention relates to the extraction technology of vanadium pentoxide, more specifically, relates to a method for continuously producing vanadium pentoxide in an industrial fluidized manner. Background technique [0002] In the prior art, the rotary kiln is usually used as the main equipment for producing vanadium pentoxide, but its service life is short. The fundamental reason is that the performance of the manufacturing materials cannot meet the process requirements, and the rotary kiln operates at high temperature under corrosive gas conditions. Broken due to excessive force. At the same time, the rotary kiln has small specifications, low production capacity, low gas utilization rate, high energy consumption and high cost. In addition, the rotary kiln process requires relatively strict sealing in order to prevent possible gas leakage from the equipment, but due to manufacturing and installation factors, it is generally not easy to achieve in lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/02
Inventor 胡力刘丰强邓孝伯陈自清孙朝辉张帆
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM