nickel hydroxide sludge recycling

[emjaypee]

Could anyone shed any light on the easiest and most cost effective method of : 1.Recycling nickel hydroxide sludge.
2.Removing the nickel from nickel hydroxide sludge.
Thanks for your help......

 

[PBroad]

Presumably this hydroxide sludge is from a lime precipitation process, thus is a nightmare to handle. Have you looked at ammoniacal leaching and subsequent electro-winning to recover nickel. Process would however depend on nickel strength and other impurities