Method for synthesizing vanadium-containing steelmaking annexing agent through carbon thermal reduction and nitridation

A nitriding synthesis and additive technology, which is applied in the field of new vanadium-containing steelmaking additives and its preparation, can solve the problems of low grade and low density of vanadium-nitrogen alloys, and achieve the goals of reducing production costs, increasing nitrogen content, and increasing yield Effect

Inactive Publication Date: 2017-07-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the density of vanadium-nitrogen alloys is low, and the impurity content of vanadium-nitrogen alloys currently used in industry is high in carbon or oxygen.
Although ferrovanadium nitride has a high density, the grades of vanadium and nitrogen are low. The highest grade ferrovanadium nitride in the current national standard [GB / T 30896-2014, ferrovanadium nitride] is FeV65N, with a nitrogen content of 11%- 15%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The present invention uses V 2 o 5 , Fe 2 o 3 Take activated carbon as raw material, mix well, briquette, put it into a pusher kiln, filled with nitrogen atmosphere, first push the block sample to 650°C pre-reduction area, keep it warm for 2 hours, and then push it to 1600°C high-temperature carbothermal reduction area, After 3 hours of heat preservation, the samples were pushed to the cooling area for cooling. In the product obtained in this embodiment, the vanadium content is 70.2%, the nitrogen content is 16.28%, the carbon content is 1.54%, the oxygen content is 0.82%, and the balance is iron.

Embodiment 2

[0023] The present invention uses V 2 o 3 , Fe and graphite as raw materials, mix well, briquette, put it into a pusher kiln, filled with nitrogen atmosphere, directly push the block sample to 1550 ℃ high temperature carbothermal reduction area, keep it warm for 3 hours, and finally push the sample to the cooling area cool down. In the product obtained in this embodiment, the vanadium content is 74.56%, the nitrogen content is 17.5%, the carbon content is 0.43%, the oxygen content is 1.98%, and the balance is iron.

Embodiment 3

[0025] The present invention uses NH 4 VO 3 , FeO and graphite as raw materials, mix well, briquette, put it into a pusher kiln, filled with nitrogen atmosphere, first push the block sample to 650 °C pre-reduction area, keep it for 2 hours, and then push it to 1500 °C high temperature carbon thermal reduction area, keep warm for 3 hours, and finally push the sample to the cooling area for cooling. In the product obtained in this embodiment, the vanadium content is 75.76%, the nitrogen content is 17.7%, the carbon content is 0.05%, the oxygen content is 1.48%, and the balance is iron.

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Abstract

The invention relates to a method for synthesizing a vanadium-containing steelmaking annexing agent through carbon thermal reduction and nitridation. A product is a low-iron-content vanadium nitrogen alloy, and main elements include 65%-78% of vanadium, 16%-20% of nitrogen and 0-15% of iron. The method is characterized in that vanadium oxide, iron oxide or iron simple substance, a binder and a carbon reducing agent are directly used as main raw materials to be evenly mixed to be subject to briquetting molding, then the raw materials are placed into a high temperature furnace (such as a pushed slab kiln, a tunnel kiln and the like) and sequentially pass through three zones including a prereduction zone, a high temperature carbon reduction nitridation zone and a cooling zone under the nitrogen atmosphere, and the final low-iron-content vanadium nitrogen alloy is obtained. The product synthesized by the process is good in compactness and even in nitrogen content. Compared with the vanadium nitrogen alloy, the content of impurities like carbon and oxygen is lower, and the density is higher. Compared with nitrided ferrovanadium, the product is lower in iron content and high in vanadium and nitrogen content; and in addition, the production process is short in process, and the process flow and cost can be greatly shortened.

Description

technical field [0001] The invention belongs to the field of ferroalloy preparation, and in particular relates to a novel vanadium-containing steelmaking additive and a preparation method thereof. Background technique [0002] 1. my country is a country rich in vanadium resources, with rich vanadium-bearing shale resources, and its total reserves rank first in the world. With the rapid development of my country's steel industry, the demand for high-quality steel is also increasing. Ferrovanadium, vanadium-nitrogen alloy and ferrovanadium nitride are three main additives for smelting high-strength microalloyed steel. Under the same strength, the addition of vanadium nitride can effectively use nitrogen to optimize the precipitation state of vanadium, and enhance the effect of precipitation strengthening and fine grain strengthening, so it can optimize the performance of steel. And it can save 30-40% of the added amount of vanadium, thereby reducing the cost. However, the d...

Claims

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Application Information

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IPC IPC(8): C22C27/02C22C1/10
CPCC22C1/10C22C27/025C22C1/1089
Inventor 张国华吴跃东
Owner UNIV OF SCI & TECH BEIJING
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