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Method for preparing sigma-phase FeV50

A technology of electric thermite and raw materials, which is applied in the field of metallurgy to achieve good application prospects, reduce vanadium loss, and increase the yield of finished products

Inactive Publication Date: 2013-01-02
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the smelting method of the target alloy with the intermetallic compound σ phase FeV50

Method used

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  • Method for preparing sigma-phase FeV50

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Preparation of σ-phase FeV50 using the method of the present invention

[0024] Raw material: prepare the sheet vanadium (V 2 o 5 )250kg, V 2 o 3 1200kg, with 650kg of aluminum, 770kg of iron filings and 240kg of lime. Mix the material evenly and put it into the furnace. The secondary voltage is 190V to energize the arc. After the furnace material is cleared, the secondary voltage is 135V. After 60 minutes of power on, the residual vanadium in the slag is quickly analyzed to be 0.7%. Remove the poor slag and continue to energize. The voltage was 135V, and the alloy sample was taken to quickly analyze that the Al content was 1.2%. At this time, 50kg of vanadium flakes were added for dealumination. After 5 minutes, the alloy sample was taken again for analysis. The aluminum content was 0.78%. Vanadium 50.6%, vanadium recovery rate 97.3%, all σ phase, easy to break, crushing strength 505MPa.

[0025] The testing method of the crushing strength: take the van...

Embodiment 2

[0026] Example 2 Using the method of the present invention to prepare σ-phase FeV50

[0027] Raw material: prepare the sheet vanadium (V 2 o 5 )250kg, V 2 o 3 800kg, with 480kg of aluminum, 560kg of iron filings, and 100kg of lime. Mix the material evenly and put it into the furnace. The secondary voltage is 190V to energize the arc. After the furnace material is cleared, the secondary voltage is 135V. After 35 minutes of power on, the residual vanadium in the slag is quickly analyzed to be 0.9%. Remove the poor slag and continue to energize. The voltage was 135V, and the alloy sample was taken to quickly analyze that the Al content was 1.6%. At this time, 30kg of vanadium flakes were added for dealumination. After 5 minutes, the alloy sample was taken again for analysis. The aluminum content was 0.46%. Vanadium 50.8%, vanadium recovery rate 96.9%, all σ phase, easy to break, crushing strength 390MPa.

Embodiment 3

[0028] Example 3 Using the method of the present invention to prepare σ-phase FeV50

[0029] Raw material: prepare the sheet vanadium (V 2 o 5 )300kg, V 2 o 3 800kg, with 520kg of aluminum, 580kg of iron filings, and 120kg of lime. Mix the material evenly and put it into the furnace. The secondary voltage is 190V to energize the arc. The voltage was 135V, and the alloy sample was taken to quickly analyze that the Al content was 1.1%. At this time, 50kg of vanadium flakes were added for dealumination. After 5 minutes, the alloy sample was taken again for analysis. The aluminum content was 0.66%. Vanadium 50.5%, vanadium recovery rate 97.0%, all σ phase, easy to break, crushing strength 499MPa.

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Abstract

The invention belongs to the field of metallurgy and relates to a method for preparing sigma-phase FeV50. The technical problem to the solved of the invention is to provide a method for preparing the sigma-phase FeV50 which has good apparent mass and is easy to break. In the adopted technical scheme, the sigma-phase FeV50 is obtained by uniformly mixing vanadium oxide, aluminum, iron and lime serving as raw materials, feeding the mixture into a furnace and smelting the mixture in an electric arc furnace by an electro-aluminothermic process. The method comprises the following steps of: a, adding excess aluminum into the raw materials while proportioning so as to reduce the vanadium oxide, melting a furnace charge down, depleting slag until vanadium content is low and removing lean slag; and b, adding an appropriate amount of vanadium oxide into alloy liquor from which the slag is removed to remove the excess aluminum, discharging and casting when the temperature and aluminum content ofthe alloy liquor meet requirements and cooling so as to obtain a product, namely, the sigma-phase FeV50. The crush strength of the sigma-phase FeV50 produced by the process is less than 510 MPa and convenience can be brought to vanadium iron manufacturers and customers in the crushing, sampling and using processes of vanadium iron.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a preparation method of σ-phase FeV50. Background technique [0002] As a common alloy additive, ferrovanadium has a relatively mature production process. The commonly used methods are mainly aluminothermic method and silicothermal method, each with its own advantages and disadvantages. The recovery rate of vanadium by silicothermal method is very high, up to 98%. above, but the mass fraction of carbon in the product is generally difficult to drop below 0.2-0.3%, and it is difficult to smelt high-vanadium iron. The smelting cycle of the aluminothermic method is short, and the impurity content of the product is low, but the recovery rate of vanadium is lower than that of the silicothermal method, the highest is only 95%. At present, most foreign ferrovanadium manufacturers, such as Russia's Nizhny Tagil Iron and Steel United Company, Germany's GfE Electrometallurgy Company, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/12C22B34/22C22B5/04
Inventor 鲜勇孙朝晖刘丰强邓孝伯王永刚陈海军孟伟巍
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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