High-purity flaky vanadium pentoxide and preparation method thereof

A technology of vanadium pentoxide and flakes, which is applied in the field of high-purity flake vanadium pentoxide and its preparation, can solve the problem that the thickness and size of flake vanadium pentoxide are difficult to control, the prospect of industrial promotion and application is small, and the The purity of vanadium is not high, so as to achieve the effect of rapid water evaporation, large production capacity and crisp texture

Active Publication Date: 2019-02-12
HUNAN ZHONGXIN NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The "one-step method" production of vanadium flakes occupies a small area, simplified procedures, less equipment, less one-time investment, and strong adaptability to furnace materials. However, due to intermittent production and the reverberatory furnace is an open furnace type, the production capacity is small and the production efficiency is low. , low vanadium yield, high energy consumption, poor working environment on site, and difficulty in meeting national environmental protection requirements, and the thickness and size of flake vanadium pentoxide are not easy to control, so that subsequent use requires further treatment before use
At the same time, the "one-step method" ammonia gas and its decomposed reducing gas at high temperature will reduce the pentavalent vanadium in the material to low-valent vanadium, resulting in low purity of the final product vanadium pentoxide, and the prospect of industrial application is small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the high-purity flaky vanadium pentoxide of the present embodiment comprises the following steps:

[0028] Step 1: Filter and heat the dried gas into the gas distributor on the top of the spray dryer to form hot gas, which enters the spray drying chamber uniformly in a spiral shape, and then transports the vanadium source slurry to the spray drying chamber for atomization The device atomizes the vanadium source slurry into fine liquid droplets, and contacts with hot air, the vanadium source is quickly dried into powder, and the vanadium source undergoes a decomposition reaction, which directly decomposes to form vanadium pentoxide and other vanadium oxides, and obtains products, recycle the water vapor and ammonia generated in the process;

[0029] Step 2: Place the mixture of the product of step 1-vanadium source, vanadium pentoxide and other vanadium oxides in a vacuum heating furnace with a vacuum degree of 100Pa-5000Pa, and at the same time...

Embodiment 2

[0042] The spray dryer of the present embodiment is a pressure spray dryer, and the pressure spray dryer consists of a feed liquid tank, a feeder, an air filter, a blower, a gas heater, a gas distributor, a pressure atomizer, a drying chamber, Composed of cyclone separator, exhaust fan and bag filter.

[0043]Step 1: Use a blower to filter the dry gas (air remix plus 8% oxygen equivalent to air volume) through an air filter, then heat it to 180°C by a gas heater, and enter the gas distribution at the top of the pressure spray dryer The hot air enters the pressure spray drying chamber evenly in a spiral shape, and then the ammonium metavanadate slurry is transported from the liquid tank by the feeder to the pressure atomizer on the upper part of the pressure spray drying chamber for mist The water content of the ammonium metavanadate slurry is 25wt%, and the pressure atomizer atomizes the ammonium metavanadate slurry into fine droplets, and contacts with oxygen-enriched hot gas...

Embodiment 3

[0051] The present embodiment adopts the centrifugal spray dryer: the centrifugal spray dryer is composed of a feed liquid tank, a feeder, an air filter, a blower, a gas heater, a gas distributor, a centrifugal atomizer, a drying chamber, a cyclone separator, Composed of exhaust fan and bag filter.

[0052] Step 1: Use a blower to filter the dry gas (air remix plus 15% oxygen equivalent to air volume) through an air filter, then heat it to 350°C by a gas heater, and enter the gas distribution at the top of the centrifugal spray dryer device to form oxygen-enriched hot gas, which enters the centrifugal spray drying chamber evenly in a spiral shape, and then the ammonium polyvanadate slurry is transported from the liquid tank to the centrifugal atomizer on the upper part of the centrifugal spray drying chamber by the feeder Atomization is carried out in the center, the water content of the ammonium polyvanadate slurry is 90wt%, and the centrifugal atomizer atomizes the ammonium ...

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Abstract

The invention discloses high-purity flaky vanadium pentoxide and a preparation method thereof. The method comprises the following steps that a vanadium source is rapidly dried in a spray drying mode so as to prepare a powder vanadium source, meanwhile, a part of the vanadium source is decomposed into vanadium pentoxide, then calcining is carried out in vacuum heating furnace, smelting is carried out in an oxygen-enriched air atmosphere, and then molten vanadium pentoxide flows into water-cooling rotating disc centrifugal flaking equipment through a flow guide pipe for flaking. The method has the advantages that the productivity is large, and the production efficiency is high, the applicability on the raw materials is high, the purity of the flaky vanadium pentoxide is high, the size is easy to control, in addition, the pollution is small, and even the powder vanadium pentoxide can be produced.

Description

technical field [0001] The invention belongs to the field of vanadium chemical production, and in particular relates to a high-purity flaky vanadium pentoxide and a preparation method thereof. Background technique [0002] Vanadium pentoxide is widely used in metallurgy, chemical industry and other industries, mainly for smelting ferrovanadium, as an alloy additive, accounting for more than 80% of the total consumption of vanadium pentoxide; secondly, it is used as a catalyst for organic chemical industry, that is, catalyst, It accounts for about 10% of the total, and it is used as inorganic chemicals, chemical reagents, enamel and magnetic materials, etc., accounting for about 10% of the total. [0003] For a long time, the method of domestic production of flake vanadium pentoxide is mostly "one-step method", that is, the three processes of dehydration, deammonization and melting are realized in the same melting furnace. This method mostly uses a reverberatory furnace to m...

Claims

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Application Information

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IPC IPC(8): C01G31/02
CPCC01G31/02C01P2006/80
Inventor 张春雨
Owner HUNAN ZHONGXIN NEW MATERIALS TECH
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