浸出红土镍矿英文报告.ppt

sulphuric acid leaching of nickel laterites
Shu-shuqi
12721673
Experimental
2
Introduction
1
sulphuric acid leaching of nickel laterites
Shu-shuqi
12721673
Experimental
2
Introduction
1
4
Results and discussion
3
Conclusions
Introduction
Stainless steel
High temperature alloy
Electroplate
......
The use of
metal nickel
Introduction
Pyromatellurgy
Acid leaching
Bacterial leaching
......
Laterite nickel
ore
processing
technology
Instrument
Jacketed Pilot Plant Reactors
circleing pump
Experimental
Experimental
Fig. 2. XRD patterns of the three ore samples. M: maghemite, G: goethite, L: lizardite.
Methods
A 10% w/v mixture of a screened ore sample and sulphuric acid
solution (ranging in concentration from – mol/L) was placed in
conical flask fitted with a water condenser. It was then heated to the
desired temperature (ranging from50–105 °C) and magnetically stirred at 750 rpm for 2 h. The filtered residuewaswashed with distilledwater,dried for 4 h at 100 °C and re-ground in a mortar prior to XRD analysis.
Results
Fig. 3. XRD patterns of the residue from sample 3# after leaching with sulphuric acid at 105 °C.
Fig. 6. Metal ions extracted from sample 1# at 80 °C with sulphuric acid of different concentrations.
Fig. 9. Nickel, cobalt extraction versus iron extraction from data in Fig. 6.
1) Analysis show that the leaching of Yuanjiang laterite minerals insulphuric acid decreases in the following order: lizardite>goethite> maghemite>magnetite ≈hematite >chromite≈ringwoodite.
2) Lizardite can be completely dissolved at 60 °C in mol/L sulphuric acid whilst goethite dissolves in mol/L sulphuric acid at 80 °C and maghemite, hematite and magnetite all dissolve slowly.
3) The congruency of nickel and cobalt versus iron extraction indicates
that nickel and cobalt substitute for iron in the maghemite and goethite structures and complete mineral dissolution is