nickel atmospheric leaching pdf

Top informations

Direct Nickel Process – Breakthrough Technology

• Nickel is a US$30 billion a year industry • The demand for nickel is growing and supply is threatened • Nickel sulphide discoveries are declinin g yet there is an abundant supply of laterite resources • In Jan 2014 Indonesia banned nickel laterite ore exports • Existing High Pressure Acid Leach (HPAL) and ferronickel processes are...

Iron Control in Atmospheric Acid Laterite Leaching

Jun 30, 2019· Ashok [11] has stated that the nickel content of ore should be over 14% for feasible HPAL processing and over 17% for pyrometallurgical processing 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 ....

US6680035B2 - Atmospheric leach process for the recovery ,

A hydrometallurgical process is provided for leaching nickeliferous laterite ores at temperatures below the boiling point of the pulp and at atmospheric pressure The high iron fraction of the laterite, referred to as limonite, is first contacted with concentrated sulfuric acid to partially or completely dissolve the iron and nickel into solution...

Pressure Leaching of Nickel - Hydrometallurgy: Leaching in ,

If you are referring to laterite Ni-Co leaching, HPAL is a well established process (Moa Bay, Murrin Murrin, Coral Bay, Ambatovy, etc) It is essentially an acid digestion, but recovery is increased and residence time shortened through the use of high temperatures (255 ° C -270 ° C) which in turn need high pressure (4,000 kPa – 5, 300 kPa) ) These conditions need the titanium lining ....

EXTRACTION OF NICKEL FROM A MIXED NICKEL-COBALT ,

high pressure acid leaching (HPAL), atmospheric acid leaching (AL) and heap leaching (HL) Each process has its own advantages and disadvan-tag The main advantages of HPAL are that the process requires much lower acid consumption, higher nickel and cobalt recoveries and faster dissolution kinetics than the other two methods...

KINETIC MODELS OF NICKEL LATERITE ORE LEACHING PROCESS ,

The subject of this study is leaching process of nickel-bearing laterite ore from Ržanovo, R Macedonia The influence of sulfuric acid concentration (05, 1 and 3 M H2SO4) on the extracted Ni (%, wt) was studied The leaching process intensified by magnetic stirring at different temperatures (298, 323, 348 and 363 K) in the time interval of 120 min was performed...

Iron Control in Atmospheric Acid Laterite Leaching

Jun 30, 2019· Ashok [11] has stated that the nickel content of ore should be over 14% for feasible HPAL processing and over 17% for pyrometallurgical processing 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 ....

Atmospheric pressure leaching application for the recovery ,

Atmospheric pressure leaching application for the recovery of copper and nickel from low-grade sources RKK Mbaya, MM Ramakokovhu, and CK Thubakgale Department of Chemical and Metallurgical Engineering, Tshwane University of Technology Challenges in the base metals industry include depletion of high-grade deposits, strict...

Acid leaching of base metals and separation of nickel and ,

potential for developing an integrated flowsheet based on leaching, precipitation and ion-exchange References 1 Topkaya, YA, Buyukakinci, E, 2009 Extraction of nickel from lateritic ores at atmospheric pressure with agitation leaching Hydrometallurgy 97, 33 – 38...

US4410498A - Acid leaching of nickel from serpentinic ,

Sulphuric acid leaching has been used in the treatment of lateritic ores for the recovery of nickel and cobalt therefrom However, in order to obtain good extraction from these ores, prolonged treatment using acid of high strength and also using high pressures and recycling steps have been necessary In the improved method of the invention nickel and cobalt is solubilized from high-magnesia ....

PELINDIAN BIJIH NIKEL LATERIT KADAR RENDAH ,

One of the hydrometallurgical methods to extract nickel from its ore is atmospheric acid leaching This research aims to determine the percentage of nickel recovery through the leaching process, determine the most influenced leaching factor, and determine the optimum leaching condition...

Atmospheric acid leaching of nickel- copper matte from ,

atmospheric leach stage in which the matte containing mostly Ni and Cu is leached in copper-spent electrolyte from the tank house, resulting in dissolution of nickel and precipitation of almost all the copper To understand the nature of the leaching process during this stage of the operation, the effects of temperature stirring rate and...

Nickel leaching from laterite ores by combination of ,

Atmospheric agitation leaching of nickel from laterite ore using sulfuric acid has poor selectivity to iron This results in a high acid consumption and high iron concentration in the pregnant ....

A semi-empirical kinetic model for the atmospheric ,

Nickel-copper matte leaching processes may entail an atmospheric leach followed by pressure leaching stages, or the leaching process route may involve a preleach stage (repulping stage) prior to pressure leaching stag During atmospheric leaching and in the preleach stage substantial quantities of nickel and cobalt are dissolved while copper ....

The Development of Nickel Laterite Heap Leach Projects Rev 0

processes, such as atmospheric leaching in tanks Since 2005, Vector Engineering, Inc (now part of the Ausenco group of companies) has been involved in the development of a number of nickel laterite heap leach projects around the world....

Atmospheric heap leaching of the Piauí Ni-Co laterite ,

nickel and 005% cobalt [1] Heap leach technology [2] is being applied at the Piauí deposit and it has been successfully producing a Ni-Co loaded Metal Hydroxide Product (MHP) for ~ 6 months The mineralogy of the deposit is dominated by quartz, Fe-Al-Ni silicates, Fe ,...

A FUNDAMENTAL EVALUATION OF THE ATMOSPHERIC PRE ,

In this study, the leaching behaviour of a Ni–Cu matte in CuSO4–H2SO4 solution during the repulping (pre-leach) stage at Impala Platinum Refineries was studied The repulping stage is basically a non–oxidative atmospheric leach stage, in which nickel, iron and cobalt are partially dissolved, while the copper is precipitated To...

Pressure Acid Leaching of Nickel Laterites: A Review ,

Abstract A review of the literature over the past 30 years on the processing of nickel laterites by high temperature acid leaching has been carried out to provide a better understanding of the mineralogy, leaching process chemistry and effect of operating conditions on nickel recovery, residue properties and scaling Particular attention is paid to the leaching experience of the commercial Moa ....

BACTERIAL LEACHING OF NICKEL LITERITES USING ,

The leaching of nickel laterites using acidic media and ferric ions In: VII Meeting of the Southern Hemisphere on Mineral Technology, Ouro Preto, Brazil, November 20 – 24 4 Simate, G S, Ndlovu, S, 2007 Characterisation of factors in the bacterial leaching of nickel laterites using statistical design of ,...

Direct Nickel Process – Breakthrough Technology

• Nickel is a US$30 billion a year industry • The demand for nickel is growing and supply is threatened • Nickel sulphide discoveries are declinin g yet there is an abundant supply of laterite resources • In Jan 2014 Indonesia banned nickel laterite ore exports • Existing High Pressure Acid Leach (HPAL) and ferronickel processes are...

Nickel leaching from laterite ores by combination of ,

Atmospheric agitation leaching of nickel from laterite ore using sulfuric acid has poor selectivity to iron This results in a high acid consumption and high iron concentration in the pregnant ....

Pressure Acid Leaching of Nickel Laterites: A Review ,

Abstract A review of the literature over the past 30 years on the processing of nickel laterites by high temperature acid leaching has been carried out to provide a better understanding of the mineralogy, leaching process chemistry and effect of operating conditions on nickel recovery, residue properties and scaling Particular attention is paid to the leaching experience of the commercial Moa ....

Nickel leaching from laterite ores by combination of ,

Atmospheric agitation leaching of nickel from laterite ore using sulfuric acid has poor selectivity to iron This results in a high acid consumption and high iron concentration in the pregnant ....

The E Extraction from Limonite Ore by Using 2-Air

in which nickel leaching occurs at high temperature (250–253 C) in an autoclave, while iron and aluminum are precipitated However, high operating costs and safety risks are disadvantages of this process [6] The atmospheric leaching (AL) process has been studied for the processing of various limonitic and saprolitic laterite or...

Nickel Laterites in SE Asia - CSA Global

1 Leaching of mobile constituents: alkalis, alkaline earths Breakdown of olivine, pyroxene, serpentine and leaching of Mg, Ni, Mn, Co 2 Formation of stable secondary minerals: Fe and Al oxides, clays Goethite formation, smectiteformation, adsorption of Ni from solution 3 Partial leaching of less mobile components: silica, alumina, Ti...

(PDF) ATMOSPHERIC LEACHING OF MATTE AT THE PORT NICKEL ,

[Show full abstract] possible to achieve 97% nickel extraction within 10h leaching with less than 01% nickel in the leach residue using 600kg H2SO4/t of ore with 35% w/w pulp density at 90°C ....

HYDROMETALLURGICAL EXTRACTION OF NICKEL AND ,

and nickel by atmospheric pressure sulphuric acid leaching and a pug-roast-leach process using two stage roasting for lateritic ore The ore used in the study was obtained from Çalda ğ Lateritic Ore, Manisa, Turkey The metal contents of the ore are 21 % Ni, 012 % Co, 3245 % Fe, 101 % Mn, 258 % Cr, 078 % Mg and 101 % Al...

Nickel extraction from low grade laterite by agitation ,

Jul 01, 2014· This research work deals with the extraction of nickel from a low grade nickel laterite ore, taken from a deposit located in southwestern of Iran, through agitation leaching at atmospheric pressure The assaying and mineralogical studies carried out on the nickel laterite sample, showed the 088% Ni, and principally consisted of oxide and ....

(PDF) Atmospheric acid leaching of nickel laterites review ,

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...

Why heap leach nickel laterites?

Outside of China where there are 2 atmospheric leach project and a small heap leach the only operational hydrometallurgical processes are High Pressure Acid Leaching (HPAL) 22 Pyrometallurgical For all pyrometallurgical nickel laterite operations the ore must meet quite specific criteria to result in a commercially attractive project...