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

Method used

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  • Production method and production system for vanadium pentoxide

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0025] The ammonium polyvanadate with a water content of about 25wt% is measured by a belt scale, and the bulk material is broken up 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 tail gas, the drying temperature is 100-150℃, and the water content of the test material sampled at the discharge port is 0.50wt%. Dry ammonium vanadate is put into the calcination deamination system, and the temperature is 300~360℃, the pressure is -20~-30Pa, and it is calcined for 3h to obtain a mixture of vanadium oxides. Its composition is: V 2 O 5 :98.68wt%, V 2 O 4 :1.97wt%, K 2 O+Na 2 O: 0.49wt%, in line with YB / T5304-2006 standard requirements, powdered vanadium pentoxide. The obtained powdered vanadium pentoxide can be sold dir...

Example Embodiment

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

[0027] The ammonium metavanadate with water content of about 50wt% is measured by a belt scale, and the bulk material is broken into a disc dryer by a double screw mixer for countercurrent drying. The drying heat source comes from the calcining deamination system, heating flue gas and melting equipment The mixed gas of high-temperature exhaust gas, the drying temperature is 200-250℃, and the water content of the test material sampled at the discharge port is 0.35wt%. The dry ammonium vanadate is put into the calcination deamination system, and the temperature is 430~490℃, the pressure is -10~-15pa, and it is calcined for 4h to obtain a mixture of vanadium oxides. Its composition 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, the converter gas is heated to 710~750℃, and melted under a slight negative pr...

Example Embodiment

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

[0029] The ammonium polyvanadate with a water content of about 35wt% is measured by a belt scale, and the bulk material is broken into a flash dryer through a double screw mixer for countercurrent drying. The drying heat source comes from the calcining deamination system, heating flue gas and melting equipment The mixed gas of high-temperature exhaust gas, the temperature of the drying heat source is 150-200℃, and the water content of the test material sampled at the discharge port is 0.42wt%. Dry ammonium vanadate is put into the calcination deamination system, and the temperature is 580~650℃, the pressure is -15~-20pa, and the mixture is calcined for 2h to obtain a mixture of vanadium oxides. Its composition is: V 2 O 5 :98.87wt%; V 2 O 4 : 2.36wt%; K 2 O+Na 2 O: 0.51wt%, in line with YB / T5304-2006 standard requirements, powdered vanadium pentoxide. The obtained powdered vanad...

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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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