Method for preparing nitrided ferrovanadium

A technology of ferrovanadium nitride and nitridation sintering, applied in the field of preparation of ferrovanadium nitride, can solve the problems of low apparent density, complex production process, easy to float on molten steel, etc., to reduce equipment requirements and operation. The effect of process simplification

Inactive Publication Date: 2012-05-30
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process of these traditional ferrovanadium nitride preparation methods is complicated, and the apparent density is l

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0007] The preparation method of the ferrovanadium nitride according to the present invention comprises: mixing vanadium oxide, carbonaceous powder, iron powder and water, forming and drying to obtain a formed product, heating the formed product under a nitrogen atmosphere, Then cooling is carried out, the heating process includes a preheating stage, a transition stage and a nitriding sintering stage, and the heating temperature in the preheating stage is 400°C to less than 800°C, and the heating temperature in the transition stage is 800°C To be lower than 1200°C, the heating temperature in the nitriding and sintering stage is 1200-1500°C.

[0008] According to the method provided by the present invention, the heating time of the preheating stage can be 4-8 hours, preferably 5-7 hours; the heating time of the transition stage is 3-7 hours, preferably 4-6 hours ; The heating time of the nitriding sintering stage is 8-12 hours, preferably 9-11 hours. Controlling the heating ti...

Embodiment approach

[0018] According to a preferred embodiment of the present invention, the preparation method of the ferrovanadium nitride is implemented in a push plate type tunnel kiln. In this case, by properly controlling the temperature in different sections of the push plate type tunnel kiln, the continuous preparation of ferrovanadium nitride can be realized, thereby greatly improving the production efficiency of ferrovanadium nitride.

[0019] The present invention will be further described below through examples, but the protection scope of the present invention is not limited thereto.

[0020] In the following examples, the nitrogen content and vanadium content in the ferrovanadium nitride product and the apparent density of the ferrovanadium nitride product are measured according to the GB / T 20567-2006 method.

Embodiment 1

[0022] This example is used to illustrate the preparation method of the ferrovanadium nitride provided by the present invention.

[0023] 800kg of vanadium oxide (V 2 o 3 and V 2 o 5 The mixture, the vanadium content is 63.2% by weight), the graphite powder of 220kg, the metal iron powder of 70kg (particle size is 100-140 order) and the water of 120kg mixes 30 minutes, the mixed material obtained after mixing is applied the pressure of 9MPa, It was molded into an ellipsoid shape of 50 mm×50 mm×30 mm, and the molded product was dried at 180° C. for 48 hours. Then, put the dried moldings into crucibles, and send these crucibles into the pusher type tunnel kiln. According to the temperature difference of different sections in the pusher type tunnel kiln, the pusher type tunnel kiln is divided into preheating section, Transition section, nitriding sintering section and cooling section. Nitrogen is introduced into the push plate type tunnel kiln, so that the molded object in t...

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Abstract

The invention discloses a method for preparing nitrided ferrovanadium. The method comprises the following steps of: mixing vanadium oxides, carbonaceous powder, ferrous powder and water and forming and drying the mixture to obtain a formed substance, heating the formed substance in the nitrogen atmosphere, and then cooling the formed substance, wherein the heating process comprises a preheating stage, a transition stage and a nitridation sintering stage; the heating temperature in the preheating stage is from 400 DEG C to the temperature lower than 800 DEG C; the heating temperature in the transition stage is from 800 DEG C to the temperature lower than 1200 DEG C; and the heating temperature in the nitridation sintering stage is from 1200 DEG C to 1500 DEG C. The nitrided ferrovanadium prepared by the method provided by the invention has higher nitrogen content and apparent density.

Description

technical field [0001] The invention relates to a preparation method of ferrovanadium nitride. Background technique [0002] Ferrovanadium nitride is an important vanadium alloy additive. Adding it to steel can improve the comprehensive mechanical properties of steel such as wear resistance, corrosion resistance, toughness, strength, ductility, hardness and fatigue resistance, and make steel have Good solderability. Especially in high-strength low-alloy steel, ferrovanadium nitride can strengthen and refine grains more effectively than vanadium nitride and ferrovanadium, saving vanadium-containing raw materials, thereby reducing steelmaking production costs. [0003] Recently, the preparation methods of ferrovanadium nitride mainly include liquid nitriding method and solid state nitriding method. A typical liquid nitriding method includes putting the qualified ferrovanadium melt smelted in an electric furnace into a ladle with bottom gas transfer, and at the same time inje...

Claims

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Application Information

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IPC IPC(8): C22C29/16C22C1/04
Inventor 胡力刘丰强李千文韩春辉王乖宁
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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