Rotating Impeller Hydrogen Removal in Copper Melt
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Solution Overview
Problem
Current methods for producing low-hydrogen copper in melting furnaces are inefficient and poorly reproducible, as they rely on varying gas introduction and treatment times, leading to inconsistent reduction of hydrogen content and resulting bubbles in copper parts.
Innovation Solution
A method involving a rotating impeller in a copper melt, where flushing gas is introduced to create bubbles that absorb and remove hydrogen, with optimized rotation speeds below 200 rpm, particularly between 60rpm and 30rpm, to enhance hydrogen removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas bubbles are introduced into the copper melt to reduce hydrogen content, then hydrogen removal efficiency is improved, but bubble collision and merging reduce the reaction surface area
Solution Approach 1:
The patent applies dynamics by rotating the impeller at controlled speeds (5-200 rpm) to continuously move and redistribute gas bubbles throughout the copper melt. This dynamic motion prevents bubbles from settling and merging at static positions, maintaining a dispersed bubble distribution that maximizes reaction surface area while achieving effective hydrogen removal through prolonged exposure time.
2Ease of operation
If impeller rotation speed is increased to distribute gas bubbles, then gas distribution is improved, but bubble collision frequency increases reducing effectiveness
Solution Approach 1:
The patent applies parameter changes by optimizing the impeller rotation speed to a specific range (5-200 rpm). This parameter optimization balances two opposing effects: sufficient rotation to distribute gas bubbles uniformly throughout the melt, but not so fast that bubbles collide and merge excessively. The identified speed range achieves the optimal compromise between gas distribution and bubble integrity.
3Reliability
If manual inspection methods are used to detect bubbles in copper parts, then quality control is performed, but time consumption and reproducibility are poor
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated process where an impeller mechanically stirs the copper melt and gas bubbles are introduced to chemically treat the melt. This substitution of manual inspection with automated mechanical-chemical processing eliminates time-consuming visual inspection while achieving consistent, reproducible quality through controlled hydrogen removal that prevents bubble formation in the first place.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces hydrogen content in copper melts to unprecedented levels (less than 1 ppm), producing high-quality copper products with minimal bubbles, improving the reproducibility and efficiency of the process.
Implementation Method 1
hydrogen diffuses from the copper into the individual gas bubbles
Implementation Method 2
flushing gas bubbles created when the flushing gas is introduced through the rotating impeller in the Copper melts are distributed
Data Source
Figure 1
AI summary
The invention relates to a method for producing low-hydrogen copper in a melting furnace with a rotating impeller introduced into a copper melt, wherein a purge gas is introduced into the copper melt through the rotating impeller and purge gas bubbles formed during the introduction of the purge gas are distributed in the copper melt by the rotating impeller, so that a purge gas treatment of the copper melt takes place and the hydrogen present in the copper melt is reduced, wherein during the introduction of the purge gas the rotational speed of the rotating impeller is less than 200 rpm, less than 150 rpm, less than 100 rpm, less than 60 rpm or less than 30 rpm.