atmospheric leaching nickel laterite

Aug 10 2019 · The leaching ratio of Ni increased from 554 to 632 as the leaching duration varied from 05 to 5 h when laterite ore was leached with sulfuric acid and decreased to 566 after 8 h of leaching This may be a consequence of the adsorption of Ni by leached residue

Atmospheric acid leaching of nickel and iron from limonitic laterite by sulfuric acid in the presence of sodium sulfite was studied The results show that the extractions of nickel and iron are linearly correlated once goethite starts to leach

A ferruginous nickel laterite was leached by sulfuric acid at atmospheric pressure Nickel extraction was largely dependent on sulfuric acid concentration and leaching temperature Besides these two factors leaching time and liquidsolid ratio also influenced cobalt extraction significantly Nickel was easier to be extracted than cobalt About 95 nickel and cobalt could be extracted when

Mar 01 2008 · This review examines the atmospheric leaching AL of nickel laterite ores with sulphuric acid specifically the limonite smectite clay and saprolite fractions The kinetics and mechanism of leaching of the key minerals are reviewed together with methods for enhancing nickel recovery

This review examines the atmospheric leaching AL of nickel laterite ores with sulphuric acid specifically the limonite smectite clay and saprolite fractions The kinetics and mechanism of leaching of the key minerals are reviewed together with

May 10 2016 · Nickel cobalt and iron were extracted from Caldag lateritic nickel ore under atmospheric pressure acidic leaching conditions The following variables were examined to understand their effects on extraction sulphuric acid concentration liquidtosolid ratio leaching temperature leaching time and particle size

High pressure acid leaching HPAL is the primary method for extraction of nickel from limonitic laterite The severe operating conditions the complexity of facilities and several technical problems such as scale formation have always

1 Introduction – Global nickel laterite production The world’s resources of nickel are either sulphides or laterites and while almost ¾ of the world’s resources of nickel are found as laterites until 2009 less than half of the primary nickel production came from laterite sources as illustrated in Fig 11 Dalvi et al 2004 This figure has been updated to 2009 production using data from Wood Mackenzie reviews

Heap Atmospheric Leach Heap leach treatment of nickel laterites is primarily applicable to claypoor oxiderich ore types where clay contents are low enough to allow percolation of acid through the heap Generally this route of production is much cheaper up to half the cost of production due to the lack of need to heat and pressurise

May 21 2010 · Abstract Kinetic experiments showed that the leaching of nickel in a sulphuric acid medium was controlled by chemical reaction occurring on the surface of laterite ore The apparent activation energy was 389 kJmol Microwave heating technology is efficient clean and easy to control and facilitate continuous processing of materials

Bench and pilot scale testwork carried out from 2013 have shown that a total nickel and cobalt recovery of 93 can be achieved A bankable feasibility study for a Philippine laterite mine indicated lower capex and opex than separate processing with atmospheric tank leaching and PAL

The residence time in the leaching tanks is between 26 hours with 4 hours being typical Processing of Nickel Ores and Concentrates 15 3 the ore is dissolved into the nitric acid leaving behind the acid insoluble minerals usually consisting of silicates and the pregnant leach solution PLS

221 Sulfide Type Nickel Ores Sulfide type nickel ores can be found in magmatic rocks formed by the volcanic and hydrothermal processes They usually contain 0420 of nickel 0220 copper 1030 iron 520 sulfur and several other minerals including

Iron control in the atmospheric acid leaching AL of nickel laterite was evaluated in this study The aim was to decrease acid consumption and iron dissolution by iron precipitation during nickel leaching

The third option for nickel laterite processing is atmospheric acid leaching AL Investment costs of the process are lower than for pressure leaching while the need for energy is significantly lower than for the pyrometallurgical operation 6 Another advantage of AL is the potential to valorize the leach residues

May 21 2010 · Abstract Kinetic experiments showed that the leaching of nickel in a sulphuric acid medium was controlled by chemical reaction occurring on the surface of laterite ore The apparent activation energy was 389 kJmol Microwave heating technology is efficient clean and easy to control and facilitate continuous processing of materials

saprolite ores It is an atmospheric nitric acid leaching process coupled with a patented acid regeneration system Nickel and cobalt extractions are high reported to be 90 No secondary neutralization is needed to remove residual iron Nickel and cobalt are recovered as MHP or

NOTE There are a few other types of nickel laterite processing techniques that are used throughout the world such as Caron Processing Pressure Acid Leaching PAL atmospheric leaching and bioleaching Global Nickel Refinement The following flow chart produced by UBS Research is a great depiction of how the current nickel supply is consumed

Nickel laterites Hydrometallurgy Heap leaching Nickel and cobalt abstract With the majority of nickel naturally occurring in laterite ores but the majority of production still in sulphides it is high time there was a standalone commercial nickel laterite heap leach operation

In high pressure acid leaching processes lateritic nickel ores are interacted with aqueous sulphuric acid solutions in acid resistant autoclaves at temperatures of 230 270 °C and under pressures of 3355 MPa for 60180 minutes

valuable minerals to acid leaching This study focused on atmospheric pressure acid leaching of a lowgrade nickel laterite ore and copper tailings The codissolution of cobalt magnesium and iron was observed as well as the reaction kinetics Leaching was performed on

Jun 21 2012 · The CSIROs David Robinson discusses the work to improve nickel laterites viability The nickel laterite challenge HPAL Heap Leaching HL atmospheric leaching AL and

Feb 05 2013 · An atmospheric leach process for the recovery of nickel and cobalt from lateritic ores includes providing limonitic and saprolitic ore fractions of a laterite ore separately slurrying the limonitic and saprolitic ore fractions to produce a limonitic ore slurry and a saprolitic ore slurry separating any limonitic type minerals from the saprolitic ore slurry to produce a saprolitic feed slurry milling or wet

studies involved the optimization of nitric acid leaching of nickel laterite ores at atmospheric pressure for high nickel and cobalt extraction The main parameters optimized after the characterization of laterites were the nitric acid concentration leaching temperature duration of leaching and the particle size of the ore sample

This paper presents a life cycle assessment LCA study of three nickel laterite processing technologies The main goal was to quantify selected environmental impact categories and to compare and analyse each impact category for three different nickel feedstock for stainless steel production

An atmospheric leaching process for the recovery of a nickel and cobalt from a lateritic ore said process including the steps a preparing a slurry of the lateritic ore with saline or hypersaline water having a total dissolved solids TDS content greater than 30 gL b leaching the slurry of the lateritic ore with sulfuric acid at atmospheric pressure c recovering nickel and cobalt

Leaching from the laterite ore at atmospheric pressure is mentioned by many authors 46 Halikia 4 examined the influence of kinetic parameters on the extraction of nickel from a Greek hematite type laterite during leaching with sulphuric acid at atmospheric pressure mild conditions