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SYED MD. ANWAR UL ISLAM
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Separation of Cadmium Sulphate From Copper Sulphate

11/30/2011 5:22 AM

Hi everybody,

Can anyone tell me is it possible to separate cadmium sulphate present in copper sulphate as impurities, without a sophisticated Lab. facilities?

Anwar
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PWSlack
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#1

Re: Separation of cadmium sulphate from copper sulphate

11/30/2011 5:33 AM
  • Solid or aqueous?
  • Temperatures and pressures?
  • Quantities?
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SYED MD. ANWAR UL ISLAM
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#2
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Re: Separation of cadmium sulphate from copper sulphate

11/30/2011 5:49 AM

Actually I need to make 33% copper sulphate solution. But the copper sulphate crystal generally found in the market may contain cadmium sulphate & Ferrous sulphate as impurities (somebody told me) & Cd-sulphate must be removed. Fe-SO4 is not important in this case. Lab. grade CuSO4 could be used but not available.
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PWSlack
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#3
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Re: Separation of cadmium sulphate from copper sulphate

11/30/2011 5:55 AM
  • Temperatures and pressures?
  • Quantities?

http://en.wikipedia.org/wiki/Table_of_standard_electrode_potentials

Electochemistry has a solution: A cadmium electrode and a copper electrode inserted in the solution, with a controlled voltage source wired between them outside the solution.

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SYED MD. ANWAR UL ISLAM
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#4
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Re: Separation of cadmium sulphate from copper sulphate

11/30/2011 7:40 AM

Any other chemical means?
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PWSlack
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#5
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Re: Separation of cadmium sulphate from copper sulphate

11/30/2011 8:10 AM

Any other need?

The forum still doesn't know about temperatures, pressures and quantities...

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Mikerho
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#6

Re: Separation of Cadmium Sulphate From Copper Sulphate

11/30/2011 8:33 AM

Hi Anwar,

You can recrystallize the copper sulfate from a concentrated solution. The liquid (mother liquor) left over from the recrystalization will contain much of the impurities and can be decanted off.

This may need to be done a couple of times to get the purity that you need.

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ajwinemaker
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#7
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Re: Separation of Cadmium Sulphate From Copper Sulphate

11/30/2011 8:46 PM

I agree, this is also possible.

GE is just releasing technology to concentrate (using Reverse Osmosis) and then selectively crystalize specific salts to achieve high purity.

This may be an option.
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SYED MD. ANWAR UL ISLAM
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#8
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Re: Separation of Cadmium Sulphate From Copper Sulphate

12/04/2011 6:45 AM

Dear Mikerho, Thanks for a good solution. You deserve a vote. You Helped me earlier too.
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Mikerho
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#9
In reply to #8

Re: Separation of Cadmium Sulphate From Copper Sulphate

12/05/2011 11:44 PM

Hi Syed,

Glad to help & thanks for the vote. It would be interesting to know how effective the purification step was.

Mike

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SYED MD. ANWAR UL ISLAM
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#11
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Re: Separation of Cadmium Sulphate From Copper Sulphate

12/29/2011 8:15 AM

Dear Mikhero, As by following your process & applied on animal model produced no harmful effect, it can be assumed that the impurities was removed. I was a student of chemistry at college level about 33 years ago & much of them have been forgotten. Yet, so far I could recollect now that crystallization process does not allow other impurities to be included in crystal lattice if the solution is not super saturated. I forgot this when I posted this problem in this thread. Thanks a lot.
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morrie
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#10

Re: Separation of Cadmium Sulphate From Copper Sulphate

12/28/2011 8:56 AM

A snippet from one of my old chemistry textbooks. (Partington, 5th edition)

"If a concentrated solution of potassium iodide is added to an ammoniacal solution of a cadmium salt, a white precipitate of Cd(NH3)2I2 is formed. Copper salts give no precipitate"
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SYED MD. ANWAR UL ISLAM
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#12
In reply to #10

Re: Separation of Cadmium Sulphate From Copper Sulphate

12/29/2011 8:19 AM

Dear Morrie, Many many thanks to learn it from you. I was not knowing this earlier. I am grateful to you.
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ajwinemaker (1); Mikerho (2); morrie (1); PWSlack (3); SYED MD. ANWAR UL ISLAM (5)

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