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Method for preparing nitrided ferrovanadium

A technology for ferrovanadium nitride and vanadium oxynitride, which is applied in the fields of ferrovanadium nitride, vanadium-nitrogen alloy and vanadium nitride, can solve the problems of only 6.0g/cm3, not being used as steelmaking charge, and reducing vanadium utilization rate. , to achieve the effect of shortened high temperature treatment time, good pre-reduction effect and low oxygen content

Inactive Publication Date: 2018-11-16
冯良荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN105087994B uses hydrogen and ammonium metavanadate self-propagating combustion to prepare high-purity and high-density vanadium nitride products (the information disclosed in this patent is not reliable, because it claims that the prepared vanadium nitride density can reach 6.5g / cm3, but the true density of vanadium nitride is only 6.13g / cm3, and the true density of vanadium metal is only 6.0g / cm3)
Moreover, the oxygen content is generally about 1%, and correspondingly about 1~3% of the ferrovanadium nitride added to the molten steel will be lost with the steel slag in the form of vanadium oxide, which reduces the utilization rate of vanadium.
[0023] Chinese patent CN106591687A is prepared by carbothermal reduction of vanadium nitride (or vanadium-nitrogen alloy), with iron powder and vanadium oxide powder as raw materials, and ferrovanadium nitride is prepared in a nitrogen atmosphere. Its advantages The carbon content is low, the disadvantage is that the ingredients must be precise, and the process is complicated
Vanadium nitride reduced by ammonia and hydrogen, the product density is low (less than 3.0g / ml), and cannot be used as a charge for steelmaking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054]Put 1000kg of powdered vanadium pentoxide (purity 98.23%), 20kg of iron oxide scale (through 200 mesh sieve, iron content ~70%) into the mixer and mix for 30 minutes, then transfer to the wheel mill, add 150kg of deionized water, stirred and rolled for 2 hours, and pressed into raw material balls with a diameter of about 3 cm by a double rolling ball machine. The raw material pellets were put into the shaft furnace, the maximum temperature of the shaft furnace was controlled at about 850°C, and the raw material pellets stayed in the temperature range of 300-850°C for 8 hours to obtain the intermediate product of vanadium oxynitride containing 8.1% O and 12.3% N. Put this intermediate product into a graphite crucible, which is then pushed into a pusher kiln. Ammonia and nitrogen are introduced into the pusher kiln as a protective atmosphere, and the gas flow direction is opposite to that of the graphite crucible. Heat the graphite crucible containing vanadium oxynitride ...

Embodiment 2

[0056] Add 1000kg powdered vanadium pentoxide (purity 98.23%), 100kg iron oxide scale (through 200 mesh sieve, iron content ~70%) into the mixer and mix for 30 minutes, then transfer to the wheel mill, add 150kg deionized water, stirred and rolled for 2 hours, and pressed into raw material balls with a diameter of about 3 cm with a double-roller ball press. The raw material pellets were put into the shaft furnace, the maximum temperature of the shaft furnace was controlled at about 850°C, and the raw material pellets stayed in the temperature range of 300-850°C for 8 hours to obtain the intermediate product of vanadium oxynitride containing 9.7% O and 10.5% N. Put this intermediate product into a wheel mill and roll it for 1 hour, add 20kg of water glass and 100kg of water, continue rolling for 30 minutes, and then roll it into an intermediate ball of about 3cm in size. The intermediate pellets are put into the direct-heating rotary kiln, and the intermediate pellets pass thro...

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Abstract

The invention provides a method for preparing nitrided ferrovanadium. The method is characterized by comprising the following steps: 1, with a substance containing oxygen and high-valence vanadium asa raw vanadium material and an iron-containing substance as a raw iron material, subjecting the raw vanadium material to pre-reduction and nitridation in a reducing atmosphere containing hydrogen and / or nitrogen so as to obtain a nitrided ferrovanadium intermediate product; and 2, subjecting the intermediate product and the raw iron material to high-temperature treatment in a protective atmospherecontaining hydrogen and / or nitrogen in a temperature interval of 1150 to 1850 DEG C so as to obtain nitrided ferrovanadium, wherein the raw vanadium material and the raw iron material are blended according to a mass ratio of iron to vanadium of 0.001 to 1.2. The method of the invention has the advantages that the pre-reduction and nitridation can be carried out at a low temperature; no carbon isdischarged in the process of preparation; and the produced nitrided ferrovanadium has high density, low carbon and oxygen contents and high nitrogen content.

Description

technical field [0001] The invention belongs to the fields of vanadium nitride, vanadium-iron nitride and vanadium-nitrogen alloy, and relates to a preparation method of vanadium-iron nitride. Background technique [0002] Vanadium nitride (also known as vanadium-nitrogen alloy) or ferrovanadium nitride is an excellent steelmaking additive, which can significantly improve and improve the comprehensive mechanical properties and welding properties of steel, and can save 20%~ 40% of the vanadium resources, thereby reducing the cost of steelmaking. Taking the construction industry as an example, the new tertiary steel bar produced by vanadium nitride or ferro-vanadium nitride alloying technology not only enhances the safety, earthquake resistance, toughness, and welding performance of buildings, but also can be used more Ordinary steel bars save 10% to 12% of steel and other advantages. [0003] In 1967, J.H.Downing and others disclosed in US3334992 that after mixing 181Kg of ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C29/16C22C35/00
CPCC22C1/10C22C29/16C22C35/00C22C1/1089
Inventor 甘亚冯良荣
Owner 冯良荣