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The Pressure Acid Leaching area receives the slurried feed, heats it to 225°C and mixes it with hot concentrated sulphuric acid inside four titanium-lined autoclaves. Nickel and cobalt are leached into the solution. The autoclaves are served by large preheating and pressure let down systems. In this part of the process SchuF pressure let down ...
Direct Nickel Process. Strictly Confidential HPAL • HIGH PRESSURE ACID LEACHING • Sulphuric Acid • 260°C • 600kPa • Output: MHP, NiS, Ni Metal, Co • LOCATIONS • Murrin Murrin • Ravensthorpe • Ambatovy • Goro • Ramu River • Coral Bay/Taganito 11 NiSO
The nickel and molybdenum were extracted by acid leaching under oxygen pressure. Compared with traditional roasting methods, this hydrometallurgical method eliminates SO2 and As2O3 emission (the Ni−Mo ore containing 15%−25% S). Compared with existing alkali leaching recovery of molybdenum process, almost all the nickel and considerable
Nickel Laterite Heap leaching is simple and flexible, and can be applied to the many laterite deposits that currently have no realistic path to production. This paper aims to review the current state of nickel laterite processing and aims to show that heap leaching of nickel laterites is a viable and economically attractive alternative.
Dec 20, 2013· The AMAX Acid Leach Process for oxide nickel ores generates leach liquors that can vary considerably in their nickel, cobalt, iron, aluminum, manganese, and magnesium concentrations. The nickel and cobalt can be selectively precipitated as sulfides using H2S gas at temperatures below 100°C and pressures of about 1 atmosphere gauge. Almost complete precipitation is obtained in …
Abstract In this study, the leachability of Caldag lateritic nickel ore under high pressure acid leaching (HPAL) conditions was investigated. Several HPAL parameters were tested in a comparative manner since in many cases, the extraction efficiencies of Caldag ore sample were more than 90% for nickel and cobalt. After the optimization of the process parameters, it was found that 94.1% nickel ...
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 ...
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
Nickel and copper values are separately recovered from coppernickel-sulphide matte by means of a multi-stage acid leach process. The matte is treated in a first leaching stage in which the acid to acid-reactive metals molar ratio and leaching time are controlled to selectively extract the bulk of the nickel values while the copper values remain in the leach residue.
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 3.3-5.5 MPa for 60-180 minutes.
route. This type of product can be further treated in Caron Process and/or atmospheric acid leaching to produce separate pure nickel and cobalt. In the present work, precipitation behaviour of nickel hydroxide from artificial and pregnant leach solution of Indonesian nickel laterite ore is discussed.
Acid solutions of HNO3, HCI and H2SO4 were involved in the leaching process. Leaching efficiency of nickel was studied by the acid concentration, reaction temperature and time, particle size and pulp density. The leaching of nickel with HCI and H2SO4 was found to be optimal at the acid concentration, reaction temperature and time of 5.0 M, 90 ...
al. (2007) found sulfuric acid to be more efficient than hydrochloric and nitric acid nickel leaching from serpentine ores. In general, High Pressure Acid Leach (HPAL) is known as the most effective aqueous treatment process for the extraction of valuable metals from laterite ores (Dalvi et al., 2004). But the process
In the high-pressure sulfuric acid leaching (HPSAL) process for nickel laterite in "Rudjinci" ore in Serbia, the temperature, the sulfuric acid to ore ratio, the stirring speed, and the leaching time as the predictor variables, and the degree of nickel extraction as the response have been considered.
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.
meet during AL process development have been high acid consumption, selective leaching, iron control and acceptable nickel recovery. Generally, under AL conditions, nickel is more difficult to leach from limonite than from smectite (clay) and saprolite ores [3]. To achieve high nickel extraction, often high acid consumption is required, as
In general, nickel can be extracted from its ores using smelting, high pressure acid leaching (HPAL) and Caron roast/leach processes. The Caron process, which involves reduction roasting of the ore followed by ammonia leaching of reduced ore, is one of the ways in which nickel laterite can be treated.
A hydrometallurgical resin-in-leach (RIL) process for directly recovering nickel and/or cobalt. Simultaneous pulp leaching by adding an acid or base, dissolves the metals of interest with adsorption of the metals rendered soluble in on ionic exchange resin.
FIELD: metallurgy. SUBSTANCE: procedure consists in underground leaching nickel with solution of sulphuric acid and in pumping product solution out. Further, acidity of product solution is reduced, and nickel is sorbed on ionite resin with its following desorption. Upon desorption raffinate of nickel sorption is made-up with sulphuric acid and directed to leaching as leaching solution.
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 ...
the ammonia leach process; hydrogen sulfide emissions are associated with acid leaching processes. Highly toxic nickel carbonyl is a contaminant of concern in the carbonyl refining process. Various process off gases contain fine dust particles and volatilized impurities. Fugitive emissions will …
Mar 26, 2008· 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.
The UQ Hydrometallurgy group developed a novel method for treating MHP in a selective acid leaching (SAL) process [2-5]. The SAL process involves selective leaching of nickel from MHP, leaving cobalt and manganese in the solid residue (Fig. 1). The process yields a concentrated nickel
a renewed interest has developed concerning the production of nickel and cobalt by high pressure acid leaching (HPAL) of nickel laterites. More than one third of the world's nickel is nowadays produced from laterite ores (Bergmann, 2003, pp.127-138). Laterites account for two thirds of the world's nickel …
A process for nickel recovery from a spent catalyst of definite composition has been developed using the hydro-metallurgical route. The processing steps includes direct sulphuric acid leaching followed by separation of iron as well as silica and other impurities. For a 152 microm particle size catal …
Heap Leaching is an ancient process; leaching metals out of ore goes back nearly 500 years. Mines in Hungary recycled copper-bearing solutions through waste heaps in the 1550s, Spanish miners percolated acid solutions through large heaps of oxide copper ore on the banks of the Rio Tinto in 1752 and one of the classical methods for the manufacture of copperas (iron sulphate) was to heap up iron ...
Claim 1. A continuous process for separating and recovering copper and nickel values contained in substantially non-magnetic nickel-copper matte, said process including: leaching finely livided particles of said matte in a first-stage pressure leach under an initial oxygen ovea-ressure of above about 10 psig and at a temperature above about 100 0 C in an aqueous acid sulphate solution having a ...
Indeed, most new nickel projects are investigating heap leaching as an option for at least a portion of the production. On the surface, heap leaching of a nickel laterite would not appear to be attractive owing to the low permeability of most nickel laterite ores, coupled with the expected high acid consumption and long leach cycles.