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VAR smelting method of high-purity vanadium ingot

A high-purity, secondary smelting technology, applied in the field of VAR smelting of high-purity vanadium ingots, can solve problems such as increased hardness and brittleness, strong chemical activity, and reduced plasticity of vanadium, and achieve low cost, simple operation, and improved surface quality. Effect

Inactive Publication Date: 2020-01-17
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its chemical activity is strong, and its performance is very sensitive to the content of impurities. A small amount of impurities, especially interstitial elements such as carbon, oxygen, nitrogen and hydrogen, can reduce the plasticity of vanadium and increase its hardness and brittleness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Taking the preparation of 25.6kg pure vanadium ingot as an example, the preparation steps are as follows:

[0029] Step 1: Dendritic high-purity vanadium (V99.99%) high-purity vanadium produced by the salt electrolytic refining method is used as a raw material, and the feeding amount is 25.6 kg.

[0030] Step 2: Use a hydraulic press to press high-purity vanadium into electrode blocks. The single weight of the electrode blocks is 3.2kg, and there are 8 blocks in total. Then use a vacuum plasma welding box, and the welding vacuum degree is ≤5.0×10°Pa to obtain a consumable electrode of Φ63mm×660mm.

[0031] Step 3: The consumable electrode in step 2 is smelted by vacuum consumable smelting method. The melting crucible is Φ90mm, and the crucible ratio d / D is 0.70. When melting the current, first increase the current to 2.5kA until the molten pool is healthy. Then reduce to 2.2KA until the end of smelting, smelting voltage 24-32V, arc stabilization current (DC): 2A, cooli...

Embodiment 2

[0036] Taking the preparation of 40.5kg pure vanadium ingot as an example, the preparation steps are as follows:

[0037] Step 1: Dendritic high-purity vanadium (V99.99%) produced by the salt electrolytic refining method is used as a raw material, and the feeding amount is 40.5 kg.

[0038] Step 2: Use a hydraulic press to press high-purity vanadium into electrode blocks. The single weight of the electrode blocks is 13.5kg, and there are 3 pieces in total. Then use a vacuum plasma welding box to carry out welding with a vacuum degree of ≤5.0×10°Pa to obtain a consumable electrode of Φ112mm×400mm.

[0039] Step 3: The consumable electrode in step 2 is smelted by vacuum consumable smelting method. The melting crucible is Φ140mm, and the crucible ratio d / D is 0.80. When melting the current, first increase the current to 3.0kA until the molten pool is healthy. Then reduce to 2.6KA until the end of smelting, smelting voltage 24-32V, arc stabilization current (DC): 3A, cooling time...

Embodiment 3

[0044] Taking the preparation of 132kg pure vanadium ingot as an example, the preparation steps are as follows:

[0045] Step 1: Dendritic high-purity vanadium (V99.99%) produced by the salt electrolytic refining method is used as a raw material, and the feeding amount is 40.5 kg.

[0046] Step 2: Use a hydraulic press to press high-purity vanadium into electrode blocks. The single weight of the electrode blocks is 16.5kg, and there are 8 blocks in total. Then use a vacuum plasma welding box to carry out the welding vacuum degree ≤ 5.0×10°Pa to obtain a consumable electrode of Φ120mm×1600mm.

[0047] Step 3: The consumable electrode in step 2 is smelted by vacuum consumable smelting method. The crucible for melting is Φ155mm, and the crucible ratio d / D is 0.78. When melting the current, first increase the current to 4.5kA until the molten pool is healthy. Then reduce to 4.0KA until the end of smelting, smelting voltage 26-32V, arc stabilization current (DC): 3A, cooling time ...

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Abstract

The invention provides a VAR smelting method of a high-purity vanadium ingot. High-purity vanadium is pressed into multiple electrode blocks through an oil press, and then the electrode blocks are welded into a consumable electrode. The consumable electrode is smelted with a vacuum consumable smelting method, a primary ingot is obtained, then secondary smelting, scaling and riser cutting-off are carried out, and the finished cast ingot is obtained. The purposes that the pure vanadium ingot is clean, and the interior and surface quality is good are achieved, the vacuum consumable smelting method is mature in technology, the automation degree of the process is high, the operation is easy, the cost is low, preparation of the industrial-scale cast ingot can be achieved, and good blanks are provided for following hot working and machining.

Description

technical field [0001] The invention belongs to the field of new material preparation and relates to a VAR smelting method for high-purity vanadium ingots. Background technique [0002] Vanadium is a silver-gray metal. Vanadium has a density of 6.11g / cm3 and a melting point of 1919±2°C, which belongs to the high melting point rare metals. Pure vanadium has good plasticity and can be rolled into sheets, foils and drawn wires at room temperature. However, its chemical activity is strong, and its performance is very sensitive to the content of impurities. A small amount of impurities, especially interstitial elements such as carbon, oxygen, nitrogen and hydrogen, can reduce the plasticity of vanadium and increase its hardness and brittleness. [0003] At present, the world is facing crises such as environmental pollution, climate warming, and energy shortages, which have led countries to join in the search for new sustainable energy sources. The prominent advantages of nucle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B9/20
CPCC22B9/20C22B34/22
Inventor 张利军刘娣焦勇周中波刘小花吴天栋薛祥义
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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