Production method of high-bulk density and high-stability vanadium trioxide

A vanadium trioxide, high-stability technology, applied in the direction of vanadium oxide, etc., can solve problems such as high maintenance and operation requirements, high production costs, and long reaction time, so as to reduce material flying loss, increase production capacity per unit time, and improve Effect of system vanadium yield

Inactive Publication Date: 2014-02-19
HEBEI IRON AND STEEL
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  • Abstract
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Problems solved by technology

Although this method can prepare vanadium trioxide, the required reaction time is long, and the furnace is released under airtight conditions, which requires high maintenance and operation of the equipment, and the finished product is powdery, easily oxidized, and the stability of the finished product is poor.
[0005] To sum up, the existing vanadium trioxide production technology has high production cost and cumbersome process, and the resulting finished products mostly exist in the form of powder, which is easily oxidized by air and has poor stability.

Method used

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  • Production method of high-bulk density and high-stability vanadium trioxide

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: The concrete technique of the production method of this vanadium trioxide is as follows.

[0019] The ammonium polyvanadate with a water content of 20.22wt% was transported to the air dryer by a screw conveyor at a drying temperature of 300°C, and the water content of the dried ammonium polyvanadate was 0.49wt%. The dry-based ammonium polyvanadate is transported to the reduction kiln by a water-cooled screw, and the reduction kiln is heated by gas, the feeding speed is 450kg / h, and the coke oven gas flow rate is 160m 3 / h, the temperature of the preheating zone in the kiln is 620°C, the temperature of the reaction zone is 750°C, and the temperature of the cooling discharge zone is 570°C. The dry-based ammonium polyvanadate was reacted in the reduction kiln for 50 minutes, and the material was discharged when the temperature was adjusted to 150°C by water cooling to obtain powdery vanadium trioxide with a total vanadium content of 64.13%. The powdered vana...

Embodiment 2

[0021] Embodiment 2: The concrete technique of the production method of this vanadium trioxide is as follows.

[0022] The ammonium metavanadate on a wet basis with a water content of 49.65wt% is transported to a flash dryer by a screw conveyor at a temperature of 500°C, and the ammonium metavanadate obtained on a dry basis has a water content of 0.45wt%. The dry-based ammonium metavanadate is transported to the fluidized furnace through a water-cooled screw, and the electric heating element is used to heat the fluidized furnace. The feeding speed is 200kg / h, and the converter gas flow rate is 80m 3 / h, the temperature of the preheating zone of the fluidized furnace is 800°C, the temperature of the reaction zone is 1000°C, and the temperature of the cooling discharge zone is 700°C. Dry base ammonium metavanadate was reacted in a fluidized furnace for 20 minutes, and the material was discharged when the temperature was adjusted to 70°C by water cooling to obtain powdery vanadiu...

Embodiment 3

[0024] Embodiment 3: The concrete technique of the production method of this vanadium trioxide is as follows.

[0025] The wet-based ammonium polyvanadate filter cake with a water content of 35.36wt% was transported to a disc dryer by a screw conveyor at a drying temperature of 100°C to obtain a dry-based ammonium polyvanadate with a water content of 0.48wt%. The dry base ammonium polyvanadate is transported to the fluidized furnace through a water-cooled screw, and heavy oil is used to heat the fluidized furnace. The feeding speed is 380kg / h, and the hydrogen gas flow rate is 120m 3 / h, the temperature of the preheating zone in the fluidized furnace is 760°C, the temperature of the reaction zone is 885°C, and the temperature of the cooling discharge zone is 500°C. The material was reacted in the fluidized furnace for 38 minutes, and the material was discharged when the temperature was adjusted to 128°C by water cooling, and the powdery vanadium trioxide with a total vanadium ...

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Abstract

The invention discloses a production method of high-bulk density and high-stability vanadium trioxide, which is characterized by comprising the following steps of reducing dry ammonium vanadate with reducing gas to obtain powdery vanadium trioxide; extruding the powdery vanadium trioxide by a feeder and a roller press to form strip vanadium trioxide; performing granulation and screening to form granular vanadium trioxide. The method is simple in production process, low in cost and suitable for large-scale industrial production. By adopting the method, the bulk density of the granulated vanadium trioxide is increased from 0.9-1.0g / cm<3> to 2.0-3.0kg / m<3>, the internal gas content is reduced, the oxidation is slowed down, the problem of inaccurate total vanadium content caused by natural oxidation of raw materials in the fields of ferrovanadium smelting and nitralloy production is solved, the loss of flying materials is greatly reduced, the vanadium yield of the system is improved, and the unit-time output of vanadium nitride or ferrovanadium also can be remarkably increased.

Description

technical field [0001] The invention relates to a production method of vanadium trioxide, in particular to a production method of high bulk specific gravity and high stability of vanadium trioxide. Background technique [0002] As an intermediate raw material for the production of vanadium iron and vanadium nitride, vanadium trioxide is an important compound of vanadium, like vanadium pentoxide, vanadium carbide, vanadium nitride, vanadium carbonitride, money vanadate, and sodium vanadate. Used in metallurgy, electronics, chemical industry and other industrial sectors. [0003] The Chinese invention patent application with the publication number CN101717117A discloses a method for industrial production of vanadium trioxide. The preparation steps are: A. preparing raw materials; B. reducing the prepared raw materials with reducing gas; C. reducing to obtain three Vanadium oxide. The method adopts ammonium vanadate or vanadium pentoxide carbon coordination and the process of...

Claims

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Application Information

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IPC IPC(8): C01G31/02
Inventor 马瑞峰卢明亮张立武宋波曹敬东马英梁
Owner HEBEI IRON AND STEEL
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