Metallurgist Mineral Processing Engineer - Pressure …

Pressure acid leaching is an acceptable process for the treatment of nickel laterites This process offers many advantages such as low energy consumption low capital cost and high nickel and cobalt recoveries The dissolution process is coupled to selective thermal hydrolysis of iron and aluminum The dissolution of laterite and precipitation of iron and aluminum are strongly dependent on the

High Pressure Acid Leach - Caldera Engineering

High pressure sulphuric acid leaching of lateritic nickel ore 477 leaching time on high pressure sulphuric acid leaching of a local lateritic nickel ore sample having 1 37 Ni were investigated by using chemical and X-ray diffraction analyses Other than nickel the

Extraction of Nickel Cobalt and Iron from Laterite Ores by …

Review A review of the literature over the past 30 years on the processing of nickel laterites by high temperature acid leaching is A pressure leaching process of nickel laterite in nitric

US2916357A - Nitric acid leaching process - Google Patents

The process chosen depends on the properties of the ore The final product is cathode copper Nickel ores This method is an acid heap leaching method like that of the copper method in that it utilises sulfuric acid instead of cyanide solution to dissolve the target

Processing mixed nickel‑cobalt hydroxide precipitate by …

High pressure acid leaching is becoming more and more important and the inevitable strain on natural resources continues Its primary purpose is the assist in the recovery of nickel from lacerite ores but can also be used for other metals such as copper and

HIGH PRESSURE SULPHURIC ACID LEACHING OF LATERITIC …

Abstract Primary nickel is produced from both lateritic and sulfidic ores Lateritic ores are formed by prolonged weathering of ultramafic rocks The laterite deposits exhibit graded layers of ore with high iron low nickel ore on top and low iron high nickel ore below

Kinetics of high pressure leaching of nickel lateritic ore Silcrete - …

This paper describes the experimental findings of the extraction of nickel and cobalt by high pressure acid leaching HPAL of a refractory limonitic nickel laterite ore from the Gördes region of Manisa in Turkey By optimizing the basic HPAL process parameters

The DNi Process The DNI Process - Direct Nickel

The process uses sulfuric acid which does not require high-cost facilities However selective nickel leaching from MS which was the process development goal could not be achieved This result is quite different from the case of selective Zn leaching from ZnS

Pressure Acid Leaching of Nickel Laterites A Review

NICKEL VALUES ARE ACID LEACHED FROM NICKELIFEROUS OXIDE ORRES BY FORMING AN AQUEOUS SLURRY OF ORE AND PYRITES IN AN AUTOCLAVE AND OXIDIZING THE PYRITES AT A TEMPERATURE BETWEEN ABOUT 200 C AND 260 ADVANTAGEOUSLY THE SLURRY IS HEATED TO A TEMPERATURE ABOVE ABOUT 250 C AFTER THE LEACHING REACTION IS …

Lateritic nickel ore deposits - Wikipedia

In the heap leaching process very dilute sulphuric acid similar in strength to some acid‐based household cleaning products is slowly applied to crushed nickel ore on a lined pad to dissolve the nickel and cobalt contained in the rock in a several month process

PDF The leaching of lateritic nickel ores in hydrochloric acid

The leaching of lateritic nickel ores in hydrochloric acid Article PDF Available in Canadian Metallurgical Quarterly 13 3 485-493 · July 1974 with 1 449 Reads

Acid leaching of nickel from dunite rock

High Pressure Acid Leach HPAL is a process used to extract nickel and cobalt from laterite ore bodies The HPAL process utilizes elevated temperatures roughly 255 degrees Celsius elevated pressures roughly 50 bar or 725 psi and sulfuric acid to

Pressure acid leaching of nickel laterite - UBC Library …

198 ERZMETALL 56 2003 Nr 4Srećko Stopić et al Sulphuric Acid Leaching of the Serbian Nickel Lateritic Ore Laterites are oxide ores widely distributed in the equatori-al regions Lateritic deposits usually consist of three layers namely the limonitic the

EXCELLENT NICKEL LEACHING TESTWORK RESULTS

In HPAL High Pressure Acid Leaching of nickel pressure leaching is used to be done in pachuka tanks but it has become obsolete and instead of pachuka tanks titanium lined autoclaves are being used From a technical point of view how can titanium lined

High pressure acid leaching of a refractory lateritic nickel …

3 10 2011· 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

US3809549A - Acid leaching of lateritic ore - Google Patents

Abstract Alkali addition for iron precipitation associated with sulfuric acid leaching of nickel laterites has been considered periodically since the late 1960s shortly after the development of the jarosite process for iron control in zinc refining In the late 1990 s a series

The HPAL Process Total Materia Article

nickel leaching The combined acid leaching and iron precipitation process involves direct acid leaching of the limonite type of laterite followed by a simultaneous iron precipitation and nickel leaching step Iron precipitation as jarosite is carried out by using nickel

Atmospheric acid leaching of nickel- copper matte from Impala …

The subject of this study is leaching process of nickel-bearing laterite ore from Ržanovo R Macedonia The influence of sulfuric acid concentration 0 5 1 and 3 M H2SO4 on the extracted Ni wt was studied The leaching process intensified by magnetic

Iron Control in Atmospheric Acid Laterite Leaching

out an acid dissolution process as a source of nickel Also a dilute presence of solution wo technological difficu ties the separat of these me amounts of iron introduce adverse economic factors s Any acid leaching process would need to selectively

KINETIC MODELS OF NICKEL LATERITE ORE LEACHING …

SGS MINERALS SERVICES T3 SGS 004 05-2005 HIGH-PRESSURE ACID LEACH PILOT-PLANT FACILITY HIGH-PRESSURE ACID LEACHING HPAL Major reserves of nickel are contained in laterite ores which have traditionally been treated by

Acid Pressure Leaching of Nickeliferous Laterite Ore

Atmospheric acid leaching of nickel-copper matte from Impala Platinum Refineries The pre-leach stage in the second process route alternative described above is the subject of this study The study investigates the leaching behaviour of Ni Cu matte in H2SO4-CuSO4 solution during the repulping stage at …

SGS MINERALS SERVICES T3 SGS 004 05-2005 HIGH PRESSURE ACID LEACHING

3 Nickel extraction in the 3 5 metre high laboratory column loaded with agglomerated Lucky Break ore recorded 67 after a period of 338 days leaching and the acid consumption is 429 kg t Vat leaching testwork for the same period has achieved similar Ni

Heap leaching - Wikipedia

thors investigated leaching of nickel and cobalt from waste superalloys with sulfuric acid directly the influ- ence factors on the leaching rates of nickel and cobalt ware mainly discussed based one the experimental re- sults 2 Experimental 2 1 Experimental

Srećko Stopi Sulphuric Acid Leaching of the Serbian Nickel …

The AMAX sulfuric acid leaching process involves countercurrent digestion of nickeliferous laterite ore at high pressure and at atmospheric conditions After solid liquid separation the nickel and cobalt values are precipitated by hydrogen-sulfide and refined into nickel

Direct Nickel Process Breakthrough Technology

US2916357A - Nitric acid leaching process - Google Patents Nitric acid leaching process Download PDF Info Publication number US2916357A US2916357A US694933A US69493357A US2916357A US 2916357 A US2916357 A US 2916357A US 694933 A

Factors Research on the Influence of Leaching Rate of Nickel and Cobalt from Waste Superalloys with Sulfuric Acid

The DNi Process is an atmospheric hydrometallurgical processing route designed to treat all types of nickel laterite ores in a single flow sheet to produce a number of final saleable products The key to the Process is the use of nitric acid as the leaching

Nickel Heap Leaching - Brazilian Nickel PLC

Such high dissolution of the nickel and cobalt suggests that these two metals were not passivated in this leaching process which is often observed with ammonia-ammonium carbonate leaching Jones and Welham 2010 White et al 2006 and is also reported

Acid Leaching of Nickel Laterites with Jarosite …

Nickel laterites are generally mined via open cut mining methods Nickel is extracted from the ore by a variety of process routes Hydrometallurgical processes include high-pressure acid leach HPAL and heap leach both of which are generally followed by

Selective Nickel Leaching from Nickel and Cobalt Mixed Sulfide Using Sulfuric Acid

The only commercially available internationally implemented process which can match the DNi Process s flexibility in output is High Pressure Acid Leaching HPAL but that process cannot treat both limonite and saprolite in one stream and is incapable of

Pressure Acid Leaching of Nickel Laterites A Review …

Kinetics of high pressure leaching of nickel lateritic ore Silcrete 1 StopiC S Friedrich B Fuchs R IME Process Metallurgy and Metal Recycling lntzestrasse 3 Aachen Germany D-52072 AnastasijeviC N Outokumpu Technology GmbH Metals Processing

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