6N high-purity cobalt ingot casting method

A cobalt ingot, high-purity technology, applied in the field of high-purity cobalt production, can solve the problems of many surface cracks on the cobalt ingot, reduce the purity of the cobalt ingot, and cannot use the target material, and achieve high product profit margin, low cost and broad market prospects. Effect

Active Publication Date: 2019-02-22
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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  • 6N high-purity cobalt ingot casting method
  • 6N high-purity cobalt ingot casting method
  • 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 a purity of 4N5 and cut it into a square of 50mmX50mm. (2) Put the materials prepared in (1) in the washing tank, and slowly add 50L of analytically pure hydrochloric acid, 9L of hydrogen peroxide, 3L of hydrofluoric acid, and 50L of deionized water into the washing tank respectively. (3) Soak for 30 minutes, take out the cobalt block, wash it with 150L deionized water at 50°C, and wash the water for recycling. (4) Quickly dry the cobalt blocks rinsed in 3 with a hot air blower at 80°C. (5) Load the dried cobalt blocks (1±0.3kg) into the single divided feeding area of ​​the electron beam furnace. (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 so that the temperature of the molten pool is 2000 degrees and keep it for 5 minutes. (9) Start feeding, push 1...

Embodiment 2

[0025] Example 1 was repeated, except that the temperature in step (11) was adjusted to 900°C, kept for 1.5 hours, and then the vacuum was broken after 6 hours. Cobalt ingots produced such as image 3 , after skinning as Figure 4 , GDMS detects 36 elements with embodiment one, and the purity result 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) turn off the electron beam, restore the initial ingot height, turn on electromagnetic induction heating, gradually heat, and the power is stable at 650kw. (12) Pull the ingot automatically at a speed of 0.08m / s after 40min. (13) After the ingot is pulled, the vacuum is broken after the ingot is cooled. Cobalt ingots produced such as Figure 5 , after skinning as Image 6 , GDMS detects 36 elements with embodiment one, product purity result 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 relatively low-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 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. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(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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