Atmospheric pressure leaching of nickel from a lowgrade
This study focused on atmospheric pressure acid leaching of a lowgrade nickelbearing ore, obtained from tuff oxides of Sarbisheh, Iran After chemical and mineralogical analysis, the preliminary leaching of the ore (0050 mm) was carried out under various conditions using different types ofNickel Heap Leaching Heap leaching is a process that extracts valuable metals from ores by dissolving the metals in a solvent The valuable metals can then be recovered from the solution by a variety of methods Heap Leaching is an ancient process; leaching Nickel Heap Leaching Brazilian Nickel PLC The behavior of the lateritic nickel ore under leaching depends on its mineralogy and associated particle size The fraction − 75 μm (64% of the ore) containing 206 % Ni and 49% of goethite was identified as the limiting fraction, thus requiring more extreme leaching conditions to provide appropriate extraction levelsKinetics of Atmospheric Leaching from a Brazilian
Selective leaching of nickel from prereduced limonitic
ore that would result in improved nickel leaching and selectivity Among numerous reductants explored, such as Na 2 S 2 O 3, H 2 C 2 O 4, SO 2, Fe0 and Fe2+ [14,15, 16,17,18,19,20] only the use of metallic iron [18] produced somewhat satisfactory results As the lixiviant, sulfuric acid has been used the most Other lixiviants were explored, as well ForThe subject of this study is leaching process of nickelbearing 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 performedKINETIC MODELS OF NICKEL LATERITE ORE The results indicate that leaching such a high acid consumable nickel ore with conventional sulphuric acid leaching is uneconomic and about 250 kg/t acid was consumed with only 6% Ni was extracted The study showed that glycinebased Ni and Co leach rates are slow and about 835% Ni and 763% Co were extracted in 672 hLeaching and ion exchange based recovery of nickel
Pressure acid leaching of Çaldağ lateritic nickel ore: An
After 548 days of leaching of the first heap, that was the most representative of the ore site, the recoveries of nickel and cobalt were 794% and 827%, respectively with calculated 528 kg/tonne of dry ore acid consumption (Oxley et al, 2006, Oxley et al, 2007) The resultant pregnant leach solution (PLS) was then treated to produce mixed hydroxide precipitate (MHP) Herein, we have successfully developed a clean method to selectively leach nickel from laterite ore using chlorination hydrometallurgical technology, which has a greatly reduced environmental impact and mild reaction requirementsSelective leaching of valuable metals from laterite The results of electrochemical measurements show that the oxidation leaching of the lowgrade nickel sulfide ore is controlled by the intermediates oxidative diffusionCations stress on lowgrade nickel sulfide ore oxidation leaching
KINETIC MODELS OF NICKEL LATERITE ORE
The subject of this study is leaching process of nickelbearing 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 performedKeywords: mixed sulfide, sulfuric acid, iron(III) sulfate, nickel selective leaching, NiS 2 1 Introduction Nickel matte and mixed sulfide (MS, ie, a mixture of nickel and cobalt sulfide) are made by rough refining from nickel sulfide ore or nickel oxide ore These intermediate products are used as raw materials for commercial nickel Selective Nickel Leaching from Nickel and Cobalt Mixed leaching of nickel from the ore at a constant total iron The entire experiment was carried out at room temperature The objective of the study was thus to calculate the amount of nickel leached or extracted from a low grade ore by bio leaching methods at different pulp densities of the ore as well as at different residence timesBIOLEACHING OF LATERITIC NICKEL ORE USING
HIGH PRESSURE SULPHURIC ACID LEACHING OF
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 137% Ni were investigated by using chemical and Xray diffraction analyses Other than nickel, the dissolution ratio values of cobalt, iron, magnesium, dissolution kinetics of nickel from lateritic ore in nitric acid solution at 40−90 °C The kinetic analysis shows that the nickel dissolution from lateritic ore occurred by diffusion controlled The activation energy for the leaching process is calculated as 7952 kJ/mol and the Arrhenius constant is found to be 95647 s−1 AcknowledgementKinetic study on leaching of nickel from Turkish lateritic In this paper a novel method for selective leaching nickel from prereduced laterite ore at atmospheric pressure was reported The reduced calcine was leached in thin acid liquor to liberate the nickel and iron together firstly By properly controlling the leaching condition, the leached iron ion could hydrolyze as goethite precipitate and regenerate the acid consumed in the leaching procedureSelective Leaching Nickel from the PreReduced
Roasting and Leaching Behavior of Nickel Laterite Ore
Nickel is mostly extracted from sulfide ores, however, laterite ores account for over 60 pct of all nickel resources in the world, and despite its predominance, there is no wellestablished process to extract nickel from such ores Nickel in laterites is hosted in many different compounds such as oxides, hydroxides, and silicates minerals The sulfationroastingleaching process has the In this paper, the selective acid leaching of nickel from the prereduced limonitic laterite under moderate HPAL conditions was studied For the calcine with reduction degree of 934%, about 882% nickel could be selectively extracted at 100°C with an acid/ore ratio of 0164, leaving less then 50g/L iron in the solution FurtherSelective leaching of nickel from prereduced limonitic nickel leaching ore acid solution Prior art date Legal status (The legal status is an assumption and is not a legal conclusion Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed) Expired Lifetime Application number US06/312,252 Inventor William R Hatch Ronald R DunnUSA Acid leaching of nickel from serpentinic
Efficient Synchronous Extraction of Nickel, Copper,
Low‒nickel matte as the main intermediate product of nickel sulfide ore in traditional pyrometallurgical smelting, during this process, the valuable metals Ni, Keywords: mixed sulfide, sulfuric acid, iron(III) sulfate, nickel selective leaching, NiS 2 1 Introduction Nickel matte and mixed sulfide (MS, ie, a mixture of nickel and cobalt sulfide) are made by rough refining from nickel sulfide ore or nickel oxide ore These intermediate products are used as raw materials for commercial nickel Selective Nickel Leaching from Nickel and Cobalt Mixed saprolite gangue increased from 03g Ni/ g ore at pH 3 to 11g nickel/ g ore at pH 42 Similarly, adsorption on limonite gangue increased from 12 g Ni/ g ore at pH 42 to 26g Ni/ g ore at pH 77 These results confirm leaching at solution pH higher than the isoelectric point results in greater electrosorption effect resulting in lowerLeaching of Low Grade Nickel Ores by Fungi
Kinetic study on leaching of nickel from Turkish lateritic
dissolution kinetics of nickel from lateritic ore in nitric acid solution at 40−90 °C The kinetic analysis shows that the nickel dissolution from lateritic ore occurred by diffusion controlled The activation energy for the leaching process is calculated as 7952 kJ/mol and the Arrhenius constant is found to be 95647 s−1 AcknowledgementMaterial Matters Nickel Oil Silver Iron ore Copper Apr 12, 2021 A glance through the latest expert views and predictions about commodities: Nickel, Oil, Platinum, Silver, Iron Ore, Copper With Tsingshan’s move into ‘class 2’ conversion significantly undermining the mediumterm bull thematic, Citi has trimmed nickel prices between 6% and how to operate nickel iron ore leaching FelonaThe mechanism of nickel leaching from MS using sulfuric acid was identified It was shown that nickelselective leaching using sulfuric acid is difficult because of the formation of elemental sulfur and NiS 2 precipitates on the MS surface that interfere with the leaching reactionSelective Nickel Leaching from Nickel and Cobalt
Acid leaching of nickel from serpentinic laterite ores
In other limonitic ore fraction treating processes, which are disclosed in US Pat Nos 3,991,159, 4,044,096 and 4,098,870, a serpentinic ore fraction is added for reducing the high acidity in the pregnant liquor obtained by pressure leaching; such neutralization is necessary for the subsequent separation or extraction of nickel and cobalt The laterite ore or concentrate is subjected to a leaching step with a lixiviant comprising hydrochloric acid to leach nickel from the laterite ore Nickel is extracted with an oxime at a lower pH than other processes for extraction of nickel from solution, especially after separation of iron and cobalt valuesRECOVERY OF NICKEL IN LEACHING OF LATERITE Leaching of A Primary NickelCobalt Sulphide Ore, ALTA 2002 Conference, May 2002, Perth, Australia 5 Neale, J et al, The Mondo Minerals Nickel Sulfide Bioleach Project: Construction, Commissioning and Early Plant Operation, ALTA 2016 Conference, May 2016, Perth, Australia 6ALTA MetBytes Bioleaching Moves into Nickel
USA Acid leaching of nickel from serpentinic
nickel leaching ore acid solution Prior art date Legal status (The legal status is an assumption and is not a legal conclusion Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed) Expired Lifetime Application number US06/312,252 Inventor William R Hatch Ronald R Dunn Extraction of Nickel This paper introduces the extraction of nickel process and characteristics of laterite nickel ore dressing, highlights the nickel ore crushing, washing in the nickel production process design 1 Description of nickel ore The laterite nickel ore is complex in composition and can be roughly divided into two types: limonite type and silicon magnesiumnickel typeExtraction of Nickel Nickel Ore Mining Mining