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Vanadium metal smelting process

A metal and process technology, applied in the new metallurgical technology field, can solve the problems of unsuitable temperature requirements, large temperature control deviation of the heated body, reaction control, etc., and achieve the effects of heat concentration, high energy utilization rate, and fast heating rate.

Inactive Publication Date: 2011-07-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional heating devices basically use heat transfer and heat radiation to achieve the purpose of temperature rise and temperature control. This type of heating method has a large deviation in temperature control of the heated body, and is not suitable for reaction control with strict temperature requirements.

Method used

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  • Vanadium metal smelting process

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Take 1000g vanadium pentoxide refined powder (purity ≥99%), put it on the fluidized bed distribution plate, bubbling in nitrogen for 10 minutes (10L / min) and start heating up (heating rate=100℃ / min). Control the microwave heating equipment to keep the temperature constant at 650°C, introduce reducing gas carbon monoxide at 10L / min, turn on the exhaust device to exhaust the tail gas, and maintain the pressure difference between the upper and lower sides of the distribution plate at 30KPa. After 30 minutes of reduction, close the reduction gas circuit and exhaust gas circuit, and cool down to below 100°C steadily. Phase analysis of the obtained product showed that it was basically purple-black vanadium trioxide powder, which contained a small amount of vanadium dioxide. The utilization rate of reducing gas carbon monoxide is 79%.

[0031] The reduced vanadium trioxide powder is mixed with 5% polyvinyl alcohol (PVA) aqueous solution, and the mixing mass ratio is controlled t...

example 2

[0033] Take 1000g vanadium pentoxide refined powder (purity ≥99%), put it on the fluidized bed distribution plate, bubbling in nitrogen for 10 minutes (10L / min) and start heating up (heating rate=100℃ / min). Control the microwave heating equipment to keep the temperature constant at 650°C, pass in the reducing gas hydrogen at 10L / min, open the exhaust device to exhaust the tail gas, and maintain the pressure difference between the upper and lower sides of the distribution plate at 35KPa. After 30 minutes of reduction, close the reduction gas circuit and exhaust gas circuit, and cool down to below 100°C steadily. Phase analysis of the obtained product showed that it was basically purple-black vanadium trioxide powder. The utilization rate of reducing gas hydrogen is 83%.

[0034] The reduced vanadium trioxide powder is mixed with 5% polyvinyl alcohol (PVA) aqueous solution, and the mixing mass ratio is controlled to 10%. After stirring evenly, batches are pressed into Φ40mm*10mm d...

example 3

[0036] Take 1000g vanadium pentoxide refined powder (purity ≥99%), put it on the fluidized bed distribution plate, bubbling in nitrogen for 10 minutes (10L / min) and start to heat up (heating rate ≥50°C / min). Control the microwave heating equipment to keep the temperature constant at 600°C, introduce reducing gas carbon monoxide at 10L / min, turn on the exhaust device to discharge the tail gas, and maintain the pressure difference between the upper and lower sides of the distribution plate at 40KPa. After 30 minutes of reduction, close the reduction gas circuit and exhaust gas circuit, and cool down to below 100°C steadily. Phase analysis of the obtained product showed that it was basically purple-black vanadium trioxide powder. The utilization rate of reducing gas carbon monoxide is 82%.

[0037] The reduced vanadium trioxide powder is mixed with 5% polyvinyl alcohol (PVA) aqueous solution, and the mixing mass ratio is controlled to 10%. After stirring evenly, batches are pressed...

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Abstract

The invention discloses a vanadium metal smelting process. The process prepares vanadium metal by combining a microwave fluidized bed technology and a flexible flat cable (FFC) electric deoxidation technology and using vanadium pentoxide as a raw material. The method comprises the following steps of: directly reducing the vanadium pentoxide with low melting point (the melting point is 690 DEG C) into vanadium trioxide in short time at the temperature of between 600 and 650 DEG C by using the characteristics of high heating efficiency, quick temperature rise and gas-solid contact of a microwave fluidized bed and adopting hydrogen and / or carbon monoxide as reducing gas; directly preparing the vanadium trioxide which has high melting point into an oxide cathode by molding and sintering processes; and performing FFC electric deoxidation on the oxide cathode in molten salt of calcium chloride or mixed molten salt of calcium chloride and sodium chloride, crushing the electrolyzed cathode by using ultrasonic wave, then performing water washing, acid washing and alcohol washing to remove impurities, and finally obtaining the vanadium metal with purity of over 99 percent, wherein the current efficiency is kept over 70 percent, the energy utilization rate of microwave heating equipment is over 80 percent, and the electrolysis energy consumption is 10kwh to 13kwh / kg.

Description

technical field [0001] The invention belongs to the fields of metallurgy, electrochemistry and the like, and relates to a novel metallurgical technology combining fluidized bed reduction and molten salt electric deoxidation. Mainly around the breakthrough and innovation of metal vanadium smelting technology with high cost at present, through the design of a new process route, the integration of microwave heating technology, fluidized bed reduction technology and direct oxide reduction technology (FFC) with five Vanadium oxide is used as the basic raw material to directly prepare metal vanadium. Background technique [0002] Metal vanadium is an important strategic resource, mainly used for refining alloy steel, used as cannon, tank, aircraft, missile, spacecraft and various industrial materials. Adding vanadium to alloy steel can make it exhibit excellent mechanical properties such as high temperature resistance, low temperature resistance, wear resistance, and impact resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/26C22B5/12
Inventor 郭占成蔡卓飞张志梅
Owner UNIV OF SCI & TECH BEIJING
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