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Method for preparing high-purity oxygen-free copper rod by upper leading method

An oxygen-free copper rod and high-purity technology, applied in the field of electrical copper, can solve the problems of unsatisfactory oxygen-free copper rod preparation method, harsh preparation process conditions, melt purification and impurity removal, etc., and achieves good and uniform surface finish. The effect of good stability and uniformity guarantee

Active Publication Date: 2016-11-09
安徽晋源铜业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The oxygen content of the copper rod produced by the existing up-drawing method is generally between 20-100PPM, but the conditions of its preparation process are harsh, and there are poor effects on the purification and removal of impurities, oxygen removal and oxygen isolation of the melt, and the oxygen-free Defects such as unsatisfactory copper rod preparation methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing high-purity oxygen-free copper rods by an upward-drawing method proposed by the present invention comprises the following steps:

[0025] S1, adding electrolytic copper into the smelting furnace and melting to obtain copper liquid, adding molten salt, the consumption of the molten salt is 0.15% of the quality of electrolytic copper, and the molten salt is composed of sodium borate 65%, sodium fluorosilicate 10%, It is composed of 10% cryolite, 5% calcium fluoride, 5% titanium dioxide and 5% sodium chloride. At the same time, high-purity nitrogen is continuously introduced into the copper liquid. The pressure of high-purity nitrogen is 0.2MPa, and the purity is ≥99.99%. Nitrogen flow is 6m 3 / h, the ventilation time is 30min, and the preparation method of the molten salt includes adding sodium borate, sodium fluorosilicate, cryolite, calcium fluoride, titanium dioxide and sodium chloride to the stainless steel crucible according to the above-mentio...

Embodiment 2

[0030] A method for preparing high-purity oxygen-free copper rods by an upward-drawing method proposed by the present invention comprises the following steps:

[0031]S1, adding electrolytic copper to melting furnace to obtain copper liquid, adding molten salt, the consumption of described molten salt is 0.25% of the quality of electrolytic copper, and molten salt is composed of sodium borate 60%, sodium fluorosilicate 10%, It is composed of 10% cryolite, 5% calcium fluoride, 5% titanium dioxide and 10% sodium chloride. At the same time, high-purity nitrogen is continuously introduced into the copper liquid. The pressure of high-purity nitrogen is 0.3MPa, and the purity is ≥99.99%. Nitrogen flow is 2m 3 / h, the ventilation time is 45min, wherein the preparation method of the molten salt includes adding sodium borate, sodium fluorosilicate, cryolite, calcium fluoride, titanium dioxide and sodium chloride to the stainless steel crucible according to the above-mentioned weight pe...

Embodiment 3

[0036] A method for preparing high-purity oxygen-free copper rods by an upward-drawing method proposed by the present invention comprises the following steps:

[0037] S1, adding electrolytic copper into the smelting furnace and melting to obtain copper liquid, adding molten salt, the consumption of the molten salt is 0.2% of the quality of electrolytic copper, and the molten salt is composed of sodium borate 60%, sodium fluorosilicate 13%, It is composed of 12% cryolite, 7% calcium fluoride, 1% titanium dioxide and 7% sodium chloride. At the same time, high-purity nitrogen is continuously introduced into the copper liquid. The pressure of high-purity nitrogen is 0.25MPa, and the purity is ≥99.99%. Nitrogen flow is 4m 3 / h, the ventilation time is 35min, wherein the preparation method of the molten salt includes adding sodium borate, sodium fluorosilicate, cryolite, calcium fluoride, titanium dioxide and sodium chloride to the stainless steel crucible according to the above-me...

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Abstract

The invention discloses a method for preparing a high-purity oxygen-free copper rod by a upper leading method. The method comprises the following steps: (S1) electrolytic copper is molten to obtain molten copper; molten salt is added, and consists of 60-65% of sodium borate, 10-15% of sodium fluosilicate, 10-15% of cryolite, 5-10% of calcium fluoride, 1-5% of titanium dioxide and 5-10% of sodium chloride; and high-purity nitrogen is introduced in the molten copper; (S2) a deoxidizer consisting of a Cu-Re alloy and lithium oxide is added in the molten copper for stirring to reach uniform distribution; (S3) the molten copper is leaded to an insulation furnace; and a layer of flake graphite covers the surface of the molten copper; and (S4) a hollow crystallizer extends in the molten copper; a solid is condensed in the hollow crystallizer; and the upper end of the solid is pulled by a stretching mechanism to prepare the high-purity oxygen-free copper rod. The method for preparing the high-purity oxygen-free copper rod by the upper leading method is simple, high in impurity removing and oxygen removing efficiency and lower in pollution, and can obtain the high-purity oxygen-free copper rod with an oxygen content of not higher than 20 PPM.

Description

technical field [0001] The invention relates to the technical field of copper for electrical engineering, in particular to a method for preparing a high-purity oxygen-free copper rod by an upward-drawing method. Background technique [0002] Oxygen-free copper (generally copper products with an oxygen content below 20PPM) is widely used in the production and manufacture of electronic, electrical and electrical devices due to its good electrical and thermal conductivity. Oxygen-free copper materials are used in high-frequency launch tubes, transition tubes, magnetrons, vacuum switch tubes and other products of electric vacuum devices. Since electric vacuum devices are sealed in hydrogen during the manufacturing process, there are strict regulations on the control of the oxygen content in copper. With the continuous improvement of industrial technology, the international and domestic requirements for oxygen-free copper rods continue to increase, especially the oxygen content ...

Claims

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Application Information

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IPC IPC(8): C22B9/10C22B9/05C22B9/02C22B15/14B22D11/14B22D11/111
CPCB22D11/111B22D11/145C22B9/023C22B9/05C22B9/10C22B15/006
Inventor 潘加明
Owner 安徽晋源铜业有限公司
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