|About this Abstract
||Part C-1: Hydrometallurgy 2018
||Filtration Properties of Ferric Hydroxide Precipitate in Nickel Production
||Ina Beate Jenssen, Mona Aufles Hines, Ole Morten Dotterud, Oluf Bøckman, Jens-Petter Andreassen
|On-Site Speaker (Planned)
||Ina Beate Jenssen
Ferric iron removal from the nickel electrolyte at Glencore Nikkelverk in Kristiansand is achieved by precipitation followed by filtration. It is desirable to improve filtration properties of the precipitated iron hydroxide in order to decrease the filtration time. Precipitation of iron hydroxide was studied onsite in a continuous reactor with ferrous-containing process solution as the feed material. The system was controlled with feedback regulation for pH, simulating the precipitation occurring in the plant at different temperatures and residence times. pH and redox potential was controlled by addition of NiCO3 and chlorine gas, respectively. After three residence times the slurry was filtered in order to determine the filter cake resistance. XRD analyses showed that the final product was akaganéite. It was possible to decrease the filter cake resistance by either increasing residence time or temperature, although enhanced temperature levels reduced the filter cake resistance by one order of magnitude.
||Planned: At-meeting proceedings