The copper washing process does not achieve good copper removal effects
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The total copper content in the copper melt is low, and there is a large amount of copper in the copper melting tank that has not been melted – this clearly indicates poor melting efficiency. What aspects should be considered to identify the reasons?
Our company had the same issue the year before last; the total copper content just wouldn’t go up. It might be due to the quality of electrolytic copper and glacial acetic acid, with glacial acetic acid being the main factor. For this reason, we developed specialized equipment for preparing copper alloys, and the problem has been resolved.
I wonder if the poster planned in advance where to place the copper tank, as temperature is crucial for the dissolution of copper； The HAC and total ammonia levels in the copper melt can be appropriately increased to ensure an adequate amount of free HAC and ammonia available to react with copper.
Electrolytic copper is red copper, and its quality should be guaranteed. Acetic acid is the ordinary kind; these days, glacial acetic acid isn’t used anymore, maybe that’s the reason!
Before water cooling, there was no issue with the temperature of the copper tank; now, all that can be done is to try to keep the levels of acetic acid and free ammonia as low as possible.
The original process of using copper tanks indeed took place before water cooling, but now many factories have changed to doing it between the heater and the regenerator, which results in a much better copper conversion effect.
The total amount of copper cannot be increased, and there is still copper in the copper-oxidizing tank; in other words, the copper-oxidizing process is not effective. Aside from the reasons mentioned by the students upstairs, could there also be an issue related to the ratio of copper? What if we keep the copper ratio at the lower limit to see how it works?
Since normal production must be maintained, the copper ratio will fluctuate between the upper and lower limits.
It’s better to get rid of copper washing and processing as soon as possible – it involves high energy consumption, causes significant pollution, and is costly.
Copper washing does indeed cause significant pollution and high energy consumption, but the initial investment is relatively low. We are also preparing to abandon the copper-plating and double-methacrylate process. But just then, the financial crisis hit! ! ! ! ! ! ! ! !
The traditional copper washing purification process has been gradually phased out, with high energy consumption, severe pollution, and safety hazards being the main reasons for its elimination. Additionally, adjusting the composition of the copper melt poses operational difficulties. The reasons for poor purification effects using copper tanks were already explained in previous sections; as a supplementary point, cutting red copper into smaller pieces can increase the frequency of testing.
One possible reason is that the copper mass is too large. The copper ratio analysis is conducted once per hour. The total copper analysis is carried out once per day. A comprehensive analysis of the copper melt is done once per week, with additional tests performed in special cases.
Increase the temperature of the copper melting tank, keep the copper ratio at the lower limit of the specified range, appropriately raise the levels of ammonia and acetic acid, and maximize the contact area between copper and the molten copper. This post was last edited by chen3jun on 2009-3-6 21:09]
Appropriately increase the temperature of the copper dissolution tank; keep the copper ratio at the lower limit of the specified range. Increase the levels of ammonia and acetic acid as appropriate, but maintain a normal amino acid ratio. Reduce the size of the electrolytic copper plates to maximize the contact area between copper and the copper melt. Clean the copper melt filter regularly, drain oil and water frequently, and open the copper dissolution tank from time to time for inspection in order to remove any oil stains from the copper plates. Another option is to avoid using electrolytically refined copper (the quality of such copper can sometimes be uncertain). We have encountered this situation in the past; since 1995, we have been using recycled copper wire from old cables as raw material. Of course, it is necessary to ensure good quality by removing any impurities, and insulated wire must not be used at all.
Previously, we would cut up the red copper, open the regenerator manhole, and add it to the regenerator, which made the dissolution process much faster! But be careful! :lol
That’s a good idea. We’re planning to replace the regenerator during this maintenance session; I’ll go and add all the copper to it.
It’s mainly the oil contamination issue; we’ve encountered it before. Solution: Pour the copper melt into the gutter several times to remove the oil contamination, and separate the oil leaked from the copper pump from the copper melt recovery pipelines. Prevent oil contamination from entering the copper melt system, and increase the contact area between electrolytic copper and the copper melt.
It’s mainly oil contamination; improve filtration. This post was last edited by *aoye613 on 2009-4-21 14:53]
How often do you add copper? And how much is it? And what exactly is analyzed in a comprehensive copper melt analysis?
In my company, too, the copper in the copper melting tanks has essentially all melted, yet the total copper content does not increase – what could be the reason for this? Is there a problem with the quality of the electrolytic copper? ? ? ? ?
Let’s analyze together the reasons why copper is dissolved slowly in chemical baths: 1. There is a lot of oil in the copper solution system, which covers the surface of the electrolytic copper and hinders its dissolution. 2. Introducing ammonium bicarbonate additives or propylene carbonate for decarburization into the system severely affects copper formation. But for all these, measures can be taken, either fundamentally or temporarily, to avoid affecting production!