Ayham Hafez
Well-known member
Thanks a lot, you alright, I didn't notice the DC/AC optionDouble check to make sure your multi meter is set for DC Voltage, not AC.
Thanks a lot, you alright, I didn't notice the DC/AC optionDouble check to make sure your multi meter is set for DC Voltage, not AC.
Non concentrated Sulfuric should be enough.I'm trying to find a way to prepare about 110 liters of copper sulphate solution that contains about 5 kg of pure copper, in local market we have only copper sulphate fertilizer which seems not pure, and since I have pure copper stock (wires and tubes) I decided to prepare the copper sulfate myself, tried to make small experiment using electrolysis method but I found out that its easier to use nitric acid as an oxidizer, so I'm planning to go with this recipe for dissolving each 1 kg of copper:
696 ml 68% HNO3
860 ml 98% H2SO4
4,000 ml water, to avoid making cupper sulphate crystals on the surface of the copper pieces so reaction will not stop till consume all nitric and sulphuric acids, at the end I need the copper sulphate to be fully dissolved for the electrolyte.
The reaction equation:
Cu + HNO3 => Cu(NO3)2 + NO2 + H2O
Cu(NO3)2 + H2SO4 => CuSO4 + 2HNO3
So after reaction finished I will get free nitric acid about half first used amount.
Since quantity is a bit large, denoxing using evaporation method is not accepted, so I have one accepted way to denox nitric acid which is using Sulphamic acid.
Is using Sulphamic acid in the electrolyte is OK? and how I can measure free H2SO4 in the solution after using Sulphamic acid, or its doesn't matter just add sulphuric acid till I reach the required amps later when I run the cell?
Correction, it seems it is produced by hot concentrated Sulfuric or from Oxide with hot dilute acid.Non concentrated Sulfuric should be enough.
Hot Sulfuric at 10%+ should do the job.
Why mix in something else if you want it be pure?
Not understand you please explain. Do you mean dissolve copper in dilute sulphuric acid without an oxidizer? Or you are talking about making copper sulphate using electrolysis method?Non concentrated Sulfuric should be enough.
Hot Sulfuric at 10%+ should do the job.
Why mix in something else if you want it be pure?
The production of Copper Sulfate is done by hot concentrated Sulfuric and Copper, or Dilute Sulfuric acid from Copper Oxide.Not understand you please explain. Do you mean dissolve copper in dilute sulphuric acid without an oxidizer? Or you are talking about making copper sulphate
I think, Price + nitrate will dissolve silver and palladium, that mean extra work.Anyone here that know why one use Sulfate in stead of Nitrate?
Price only or are there other reasons?
I don't have access to copper oxide, and don't know about the effecienty of producing copper sulphate using hot concentrated copper, did you test it? Is it take long time to dissolve copper into hot concentrated sulphuric acid?The production of Copper Sulfate is done by hot concentrated Sulfuric and Copper, or Dilute Sulfuric acid from Copper Oxide.
You mean hot concentrated Sulfuric I guess.I don't have access to copper oxide, and don't know about the effecienty of producing copper sulphate using hot concentrated copper, did you test it? Is it take long time to dissolve copper into hot concentrated sulphuric acid?
I tested it only with wet ashing ic chips, but not noticed how its effective.
I didn't check the impurities, but from the shape of it its not clean, also very expensive comparing to the copper wires 99.9 price in my local market, so its much more good for me to make copper sulphate myself.You mean hot concentrated Sulfuric I guess.
I think we are talking about temperature well below what is needed for wet ashing.
If we run a Sulfuric stripping cell too hot it will dissolve the Copper mesh.
But the same will happen if the Sulfuric is below 90% in concentration.
So my guess will be somewhere around 100 150C.
And no I have had no need for a Copper cell yet and even less Copper Sulfate.
If you can get impure Copper Sulfate you can dissolve it and let it re-crystalize and sort out the pure Copper Sulfate,
it will be labor intensive but an option.
What kind of impurities do it have?
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