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Method for producing vanadium pentoxide by microwave calcinations of ammonium metavanadate

A technology of vanadium pentoxide and ammonium metavanadate, applied in the direction of vanadium oxide, etc., can solve the problems of long production cycle, difficult to guarantee product purity and particle size, low thermal efficiency, etc., and achieve the effect of short production cycle

Inactive Publication Date: 2010-08-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, vanadium deposits are mainly calcined in conventional reverberatory furnaces. Although this production method has the advantages of simple equipment structure, convenient operation, and easy control, it also has the disadvantages of large fuel consumption, low thermal efficiency (generally 15-30%), and production cycle. Long, high cost, difficult to guarantee the purity and particle size of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: the ammonium metavanadate powder with a particle size of 10-120 μm and the vanadium pentoxide powder with a particle size of 10-100 μm are placed in the respective feed bins of the microwave device after being dried at a temperature of 55° C., and the switch of the feeding device is opened to adjust Switch opening, mix vanadium pentoxide accounting for 10% of the total weight into ammonium metavanadate, adjust the feeding screw speed to 3 rpm, and transport the mixed material to the furnace of the microwave device; turn on the microwave heating switch, adjust The microwave output power is 10-15kW, and the temperature of the mixed material is raised to 500-515°C at a heating rate of 20°C / min; the switch of the discharge device is turned on, and the speed of the discharge device is adjusted to 2 rpm to control the material in the furnace. The residence time is 20 minutes, and the calcined product is recovered through the discharge system to obtain the vanadiu...

Embodiment 2

[0014] Embodiment 2: the ammonium metavanadate powder with a particle size of 10-120 μm and the vanadium pentoxide powder with a particle size of 10-100 μm are placed in the respective feed bins of the microwave device after being dried at a temperature of 55° C., and the switch of the feeding device is opened to adjust Switch opening, mix vanadium pentoxide accounting for 25% of the total weight into ammonium metavanadate, adjust the feeding screw speed to 6 rpm, and transport the mixed material to the furnace of the microwave device; turn on the microwave heating switch, adjust The microwave output power is 40-45kW, and the mixture is heated to a temperature of 515-530°C at a heating rate of 50°C / min; the switch of the discharge device is turned on, and the rotation speed of the discharge device is adjusted to 5 rpm to control the material in the furnace. The residence time is 15 minutes, and the calcined product is recovered through the discharge system to obtain the vanadiu...

Embodiment 3

[0015] Embodiment 3: the ammonium metavanadate powder with a particle size of 10-120 μm and the vanadium pentoxide powder with a particle size of 10-100 μm are placed in the respective feed bins of the microwave device after being dried at a temperature of 55° C., and the switch of the feeding device is opened to adjust Switch opening, mix vanadium pentoxide accounting for 45% of the total weight into ammonium metavanadate, adjust the feeding screw speed to 9 rpm, and transport the mixed material to the furnace of the microwave device; turn on the microwave heating switch, adjust The microwave output power is 70-75kW, and the mixture is heated to a temperature of 530-550°C at a heating rate of 80°C / min; the switch of the discharge device is turned on, and the rotation speed of the discharge device is adjusted to 8 rpm to control the material in the furnace. The residence time is 5 minutes, and the calcined product is recovered through the discharge system to obtain the vanadium...

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Abstract

The invention discloses a method for producing vanadium pentoxide by microwave calcinations of ammonium metavanadate. The ammonium metavanadate and vanadium pentoxide powder are packed in a microwave reactor after drying respectively, wherein the weight of the vanadium pentoxide is 10 to 50 percent of the total weight; the microwave frequency is 2.45GHz; the power is 0 to 80kW; the calcining temperature is between 50 and 550DEG C; the time is 5 to 30 minutes; and the purity of the calcined products is 98.5 weight percent.

Description

1. Technical field [0001] The invention relates to a method for producing vanadium pentoxide by continuous and large-scale calcining, which belongs to the field of vanadium metallurgy, material preparation technology and microwave heating. 2. Background technology [0002] Vanadium pentoxide is not only a new type of functional material that can be used as an ordinary ion-absorbing matrix material, humidity sensor, micro-battery, and electrochromism, but also a catalyst widely used in the sulfuric acid industry, or a decarburization agent in the ammonia synthesis industry. , desulfurizer and corrosion inhibitor for equipment anti-corrosion in petrochemical industry. According to the prediction of relevant departments, in the next few years, my country will become the most potential market for vanadium products in the world. Only one vanadium product that can meet the consumption of steel production, my country needs to increase production by 30% every year. It is estimated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
Inventor 张利波刘秉国彭金辉夏洪应张泽彪郭胜惠张世敏
Owner KUNMING UNIV OF SCI & TECH
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