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"How to deal with waste nickel solution"





April 5, 2010

We have problem with our waste nickel solution.We currently have nickel solution with
1% = 1000ppm
1ppm = 1mg/l
so, we wan reduce our 1000ppm to below 200ppm.
Result X - Ray (%) ICP Test (mg/l)
NiO 45 4340
Fe2O3 0.59
PdO 32.7
P2O5 18
As
Cu < 0.1
Cd
Pb 0.4
Zn
pH 5 4.67
Cr 1.11

please give us the solution on it....

Thank You.

Teven Tiran
manager - Port Dickson, Negeri Sembilan, Malaysia
^


April 7, 2010

Sorry, but something is lost in translation. If you have soluble nickel in solution, then you simply need to precipitate it as a hydroxide. If you can tolerate 200 ppm, then you just need to get your pH above 8 by adding sodium hydroxide (for example). For a lower level, then bring it on up to 10. Then you filter the insoluble nickel hydroxide out of your solution.

Jon Barrows
Jon Barrows, MSF, EHSSC
Independence, Missouri
^


April 10, 2010

If ammonia is absent: add sodium hydroxide to pH 10.5 - 11, floc out solids.

If ammonia is present: add sodium hydroxide to pH 8.5; add sodium sulfide or DTC to drop Ni; floc out solids. A bit of ferrous sulfate or alum may help. If neccessary, after sulfide addition, back adjust pH with a bit of sulfuric - dilute it, and use great care!

dave wichern
Dave Wichern
Consultant - The Bronx, New York
^

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