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A kind of 6n high-purity cobalt ingot casting method

A cobalt ingot and high-purity technology, applied in the field of high-purity cobalt production, can solve the problems of reducing the purity of cobalt ingots, many cracks on the surface of cobalt ingots, and the inability to use targets, etc., achieving low cost, high product profit margins, and broad market prospects Effect

Active Publication Date: 2020-05-05
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Smelting cobalt ingots below 4N5 (99.995%) can be obtained by induction furnace smelting, but the requirements for raw material purity are higher, and cobalt ingots with high purity above 5N are smelted, due to the influence of induction furnace melting crucible material on metal purity At present, there are no smelting products of 6N high-purity cobalt ingots in China. However, domestic electron beam furnaces are used to smelt cobalt ingots. There are many pores around the cast cobalt ingots, and there are many cracks on the surface of the cobalt ingots, and the peeling defect of fish scale grains cannot be avoided. , the water-cooled copper crucible will also reduce the purity of cobalt ingots and cannot be used in the target industry

Method used

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  • A kind of 6n high-purity cobalt ingot casting method
  • A kind of 6n high-purity cobalt ingot casting method
  • A kind of 6n high-purity cobalt ingot casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Take 100kg of electrolytic cobalt plate with purity of 4N5 and cut into 50mmX50mm squares. (2) Put the materials prepared in (1) into the washing tank, take 50L of analytical pure hydrochloric acid, 9L of hydrogen peroxide, 3L of hydrofluoric acid, and 50L of deionized water into the washing tank. (3) Soak for 30 minutes, take out the cobalt block, rinse with 150L deionized water at 50℃, and recycle the washing water. (4) Use 80℃ hot air blower to quickly dry the cobalt block washed by 3. (5) Put (4) the dried cobalt block into a single divided feed zone of the electron beam furnace per 1±0.3kg. (6) Install the cobalt bottom ingot, close the furnace door, and start vacuuming. (7) Set the initial position of the ingot to -50mm. (8) The vacuum in the furnace reaches 5.5X10 -3 At Pa, turn on the electron beam to make the temperature of the molten pool 2000 degrees and keep it for 5 minutes. (9) Start feeding, each time 1±0.3kg of cobalt material is pushed into the m...

Embodiment 2

[0025] Repeat Example 1, the difference is that the temperature of step (11) is adjusted to 900 degrees, maintained for 1.5 hours, and the vacuum is broken after maintaining the vacuum for 6 hours. The produced cobalt ingots such as image 3 , After peeling the skin like Figure 4 The 36 elements detected by GDMS are the same as in Example 1, and the purity of the product obtained is 6N4.

Embodiment 3

[0027] Repeat Example 1, the difference is that the feeding system is all processed with 5N5 cobalt plates, step (11) closes the electron beam, restores the initial ingot height, turns on electromagnetic induction heating, and gradually heats up, and the power is stable at 650kw. (12) After 40 minutes, the spindle will be automatically drawn at a speed of 0.08m / s. (13) After pulling the ingot, the vacuum is broken after the ingot is cooled. The produced cobalt ingots such as Figure 5 , After peeling the skin like Image 6 The 36 elements detected by GDMS are the same as in Example 1, and the product purity result is 6N9.

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Abstract

The invention discloses a 6N high-purity cobalt ingot casting method, and belongs to the field of high-purity metal ingots casting. In the technology, electron beam is utilized for smelting, and through technological innovations in a water cooling crucible, smelting temperature parameters, feeding, and ingot casting, 4n5 cobalt plate is cleaned, high-vacuum smelted and purified, therefore that theinternal of the ingot material is pore-fee, the surface of the ingot material is free of cracks, and the total content of impurities meets the requirement of mass production of 6N and above high-purity cobalt ingots .

Description

Technical field [0001] The invention belongs to the technical field of high-purity cobalt production, and relates to a method for casting higher-purity cobalt with lower-purity cobalt. Background technique [0002] Smelting cobalt ingots below 4N5 (99.995%) can be obtained by induction furnace smelting, but the requirements for raw material purity are higher, and high purity cobalt ingots above 5N are smelted, due to the influence of induction furnace smelting crucible material on metal purity At present, there is no smelting product of 6N high-purity cobalt ingots in China, but domestic electron beam furnaces are used to smelt cobalt ingots. There are many pores around the cast cobalt ingots, and there are many cracks on the surface of the cobalt ingots, and the scale-like grain peeling defects cannot be avoided. , The water-cooled copper crucible will also reduce the purity of the cobalt ingot and cannot be used in the target industry. Summary of the invention [0003] In order...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B9/22C22B9/04B22D7/00
CPCB22D7/005C22B9/003C22B9/04C22B9/228
Inventor 陈文福柴明强杨晓艳张亚东文成武王淑堂艾琳
Owner JINCHUAN GROUP LIMITED
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