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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
Cu < 0.1
pH 5 4.67
please give us the solution on it....
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, MSF, EHSSC
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!
Consultant - The Bronx, New York