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ACID LEACHING PROCESS FOR TREATING HIGH GRADE

Nickel and copper values are separately recovered from copper-nickel-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.

Pressure Acid Leaching of Nickel Laterites: A Review

2018-6-10  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.

ENGINEERING ASPECTS OF THE SELECTIVE ACID

2019-10-10  20 years, acid leaching processes have been selected for treating the low grade nickel laterite ore. High temperature and pressure acid leaching is particularly suitable for the iron rich fraction of the laterite ore as the dissolved iron tends to precipitate as hematite in the autoclave making the leaching process somewhat

Atmospheric pressure leaching of nickel from a low

2018-6-27  example, the prospects for using hydrochloric acid are reviewed by Harris et al. (2009) and a process based on nitric acid, termed as the DNi Process (McCarthy and Brock, 2015) has been described Teir et al. (2007) found sulfuric acid to be more efficient than hydrochloric and nitric acid nickel leaching from serpentine ores.

Roasting and Leaching Behavior of Nickel Laterite Ore

2021-3-29  The success of the sulfation-roasting-leaching process depends on iron behavior. Due to its higher amount, it is sulfated before nickel. However, the stability of iron sulfates is lower than the nickel sulfate and during the decomposition of iron sulfate, the sulfur trioxide (SO 3) is liberated and reacts with nickel to form nickel sulfate.This mechanism can reduce considerably

Kinetics of nickel leaching from roasting-dissolving

2009-5-27  Abstract: Sulfuric acid leaching process was applied to extract nickel from roasting-dissolving residue of a spent catalyst, the effect of different parameters on nickel extraction was investigated by leaching experiments, and the leaching kinetics of nickel was

Extraction of valuable metals from low nickel matte by

2019-10-1  A calcified roasting−acid leaching process was developed as a highly effective method for the extraction of valuable metals from low nickel matte in the presence of CaO additive. The influences of process parameters on the metal extraction were studied, including the roasting temperature, roasting time, addition of CaO, H 2 SO 4 concentration

Selective leaching of nickel from prereduced limonitic

2016-10-31  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

Pressure acid leaching of nickel laterite UBC Library

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

Acid-leaching Big Chemical Encyclopedia

Acid-leaching Nickel and Cobalt. Often present with copper in sulfuric acid leach Hquors are nickel [7440-02-0] and cobalt [7440-48-4]. Extraction using an organophosphoric acid such as D2EHPA at a moderate (3 to 4) pH can readily take out the nickel and cobalt together, leaving the copper in the aqueous phase, but the cobalt—nickel separation is more difficult (274).

Atmospheric pressure leaching of nickel from a low

2018-6-27  example, the prospects for using hydrochloric acid are reviewed by Harris et al. (2009) and a process based on nitric acid, termed as the DNi Process (McCarthy and Brock, 2015) has been described Teir et al. (2007) found sulfuric acid to be more efficient than hydrochloric and nitric acid nickel leaching from serpentine ores.

ENGINEERING ASPECTS OF THE SELECTIVE ACID

2019-10-10  20 years, acid leaching processes have been selected for treating the low grade nickel laterite ore. High temperature and pressure acid leaching is particularly suitable for the iron rich fraction of the laterite ore as the dissolved iron tends to precipitate as hematite in the autoclave making the leaching process somewhat

Obtaining Nickel Concentrates from Sludge Produced in

2021-12-7  Leaching the sludge produced in the process of neutralization of wastewater from a metal surface treatment plant with concentrated hydrochloric acid enabled the metals contained in the sludge from precipitate to the solution with the efficiency of 74.4% (Se) to 100% (Zn). In the case of nickel, the leaching efficiency reached 95.7%.

Selective Nickel Leaching from Nickel and Cobalt Mixed

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. The mechanism of nickel leaching from MS using sulfuric acid was identified.

HIGH PRESSURE SULPHURIC ACID LEACHING OF

2016-12-27  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 dissolution ratio values of cobalt, iron, magnesium,

Kinetics of nickel leaching from roasting-dissolving

2009-5-27  Abstract: Sulfuric acid leaching process was applied to extract nickel from roasting-dissolving residue of a spent catalyst, the effect of different parameters on nickel extraction was investigated by leaching experiments, and the leaching kinetics of nickel was

Selective leaching of nickel from prereduced limonitic

2016-10-31  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

(PDF) Advanced Review on Extraction of Nickel from

High-pressure acid leaching (HPAL) process flowsheet operating at Moa Bay (Adapted from Monhemius 1987). Flowsheet of Caron's process for processing of

Pressure acid leaching of nickel laterite UBC Library

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

Selective Nickel Leaching from Nickel and Cobalt Mixed

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. The mechanism of nickel leaching from MS using sulfuric acid was identified.

Effect of Key Parameters on the Selective Acid Leach of

2019-10-9  nickel to its trivalent state can be largely prevented while oxidation of the cobalt and manganese proceeds quickly. By controlling the acid addition, the leaching of divalent nickel and other impurities can be controlled [5]. Figure 1. Process flow diagram for the selective acid leach process to refine mixed Ni-Co hydroxide

ENGINEERING ASPECTS OF THE SELECTIVE ACID

2019-10-10  20 years, acid leaching processes have been selected for treating the low grade nickel laterite ore. High temperature and pressure acid leaching is particularly suitable for the iron rich fraction of the laterite ore as the dissolved iron tends to precipitate as hematite in the autoclave making the leaching process somewhat

(PDF) Advanced Review on Extraction of Nickel from

High-pressure acid leaching (HPAL) process flowsheet operating at Moa Bay (Adapted from Monhemius 1987). Flowsheet of Caron's process for processing of

Selective leaching of nickel from prereduced limonitic

2016-10-31  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

08. Srecko Stopic RWTH Aachen University

2016-10-21  al., 2011, pp.251-258). The percentage of nickel leaching for different acids at the time intervals of 40, 80 and 120 hours at a concentration of 1M was studied. Oxalic acid was the most efficient leaching agent compared to the other two used acids. The maximum leaching efficiency was about 30% under the above mentioned conditions. Superiadi has

ALTA MetBytes Developments in Hydromet Processing

2020-1-15  The DNi process is being developedby Direct Nickel Limited, Australia, for the processing of both limonite and 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

Hydrometallurgical process for the separation and

2020-1-3  The success of the process is based on the selectivity nickel leaching over iron, as the ores are limonitic and contained signif-icant amounts of low reactivity hematite together with goethite. A typical composition of the pregnant solution produced from heap leaching of Greek low-grade nickeliferous laterites with sul-phuric acid is the

Efficient Synchronous Extraction of Nickel, Copper, and

2020-6-18  In general, the hydrometallurgical process of sulfide ore including the heap leaching 12, acid leaching 13, and ammonia leaching 14,15.