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Production method and production system for vanadium pentoxide

A vanadium pentoxide and production method technology, which is applied in the direction of vanadium oxide, etc., can solve the problems of lower qualified rate and vanadium recovery rate, no deammonization and ammonia recovery device, high melting temperature, etc., so as to improve the vanadium yield and realize large-scale Industrialized production, fast melting effect

Inactive Publication Date: 2012-08-01
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, dehydration, deamination, and melting are completed in one system. There is no independent deamination and ammonia recovery device, and the discharge of ammonia gas will cause environmental pollution.
In addition, due to the slow release of ammonia gas, ammonia gas and the reducing gas decomposed at high temperature will reduce the pentavalent vanadium in the material to low-valent vanadium, resulting in high melting temperature, high vanadium burning loss rate, qualified rate and vanadium The recovery rate is reduced, and the prospect of industrialization and application is small

Method used

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  • Production method and production system for vanadium pentoxide

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Effect test

Embodiment 1

[0024] Embodiment 1: the production method of vanadium pentoxide adopts following processing steps.

[0025] Ammonium polyvanadate with a water content of about 25wt% is measured by a belt scale, and the bulk material is crushed by a double-screw mixer and put into a flash dryer for drying. The drying heat source comes from the heating flue gas of the calcination deamination system and the melting equipment. The mixed gas of high-temperature exhaust gas, the drying temperature is 100-150°C, and the water content of the material is 0.50wt% by sampling at the outlet. Dried ammonium vanadate is put into the calcination deamination system, and calcined for 3 hours at a temperature of 300-360°C and a pressure of -20--30Pa to obtain a mixture of vanadium oxides, the composition of which is: V 2 o 5 : 98.68wt%, V 2 o 4 : 1.97wt%, K 2 O+Na 2 O: 0.49wt%, meeting the requirements of the YB / T5304-2006 standard, is powdery vanadium pentoxide. The obtained powdery vanadium pentoxide ...

Embodiment 2

[0026] Embodiment 2: the production method of vanadium pentoxide adopts following process steps.

[0027] Ammonium metavanadate with a water content of about 50wt% is measured by a belt scale, and the bulk material is crushed by a double-screw mixer and put into a disc dryer for countercurrent drying. The drying heat source comes from the heating flue gas of the calcination deamination system and the melting equipment The mixed gas of the high-temperature exhaust gas, the drying temperature is 200-250 °C, and the water content of the material is 0.35wt% when the material is sampled at the outlet. Dried ammonium vanadate is put into the calcining deamination system, and calcined for 4 hours at a temperature of 430-490°C and a pressure of -10--15pa to obtain a mixture of vanadium oxides, the composition of which is: V 2 o 5 : 99.25wt%; V 2 o 4 : 6.28wt%; K 2 O+Na 2 O: 0.56wt%, continue to put it into the rapid melting casting equipment, heat the converter gas to 710-750 ℃, ...

Embodiment 3

[0028] Embodiment 3: the production method of vanadium pentoxide adopts following process steps.

[0029] Ammonium polyvanadate with a water content of about 35wt% is measured by a belt scale, and the bulk material is crushed by a double-screw mixer and put into a flash dryer for countercurrent drying. The drying heat source comes from the heating flue gas of the calcination deamination system and the melting equipment The mixed gas of high-temperature exhaust gas, the temperature of the drying heat source is 150-200°C, and the water content of the material tested at the outlet is 0.42wt%. Dried ammonium vanadate is put into the calcining deamination system, and calcined for 2 hours at a temperature of 580-650°C and a pressure of -15--20pa to obtain a mixture of vanadium oxides, the composition of which is: V 2 o 5 : 98.87wt%; V 2 o 4 : 2.36wt%; K 2 O+Na 2 O: 0.51wt%, meeting the requirements of the YB / T5304-2006 standard, is powdery vanadium pentoxide. The obtained powd...

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Abstract

The invention discloses a production method and a production system for vanadium pentoxide. The production method comprises the following steps of breaking industrial ammonium vanadate filter cakes and then continuously adding the industrial ammonium vanadate filter cakes into drying equipment and drying by using high-temperature gas; enabling the dried ammonium vanadate to enter calcinating equipment for deaminizing oxidation to obtain mixer of powder vanadium pentoxide or vanadium oxide; and enabling the mixer of the powder vanadium pentoxide or vanadium oxide to enter melting equipment for melting and casting pieces to obtain flaky vanadium pentoxide. According to the production method, drying for dehydration, calcinating for deaminizing and melting and piece casing processes of ammonium polyvanadate or ammonium metavanadate are respectively operated in three sets of equipment; the temperature, the furnace charge stay time and oxidation supply atmosphere (hot air) can be effectively controlled according to different function phases of drying, deaminizing and oxidizing and optimal conditions, and thus each function phase is operated under the optimal condition and further stability, high quality and high yield are achieved. The production method can be used for producing flaky and powder vanadium pentoxide and the yield of metal vanadium is respectively greater than 99 percent.

Description

technical field [0001] The invention belongs to the field of vanadium chemical production, in particular to a production method of vanadium pentoxide and a production system thereof. Background technique [0002] Vanadium is a rare metal, and more than 90% of the world's vanadium is used in the iron and steel industry in the form of vanadium-iron alloy. Vanadium pentoxide is the most important vanadium oxide and the main raw material for the production of vanadium alloys. For a long time, the method of domestic production of vanadium pentoxide tablets is mostly "one-step method", that is, the three processes of dehydration, deamination and melting are realized in the same melting furnace. This method mostly uses a reverberatory furnace to melt APV, and uses heavy oil or gas as fuel to heat the ammonium polyvanadate in the furnace. The temperature of the furnace is controlled at about 900-1100°C. Flow out, and make a vanadium sheet of a certain thickness on a rotating water...

Claims

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Application Information

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IPC IPC(8): C01G31/02
Inventor 李秀雷马瑞峰白云龙刘树军侯建宇豆长宏付美玲
Owner HEBEI IRON AND STEEL
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