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 glycine-based Ni and Co leach rates are slow and about 83.5% Ni and 76.3% Co were extracted in 672 h.
The limonitic laterite ore was obtained from Papua New Guinea and dried at 105 °C for 24 h. The amounts of metal elements (iron, magnesium, aluminum, chromium, nickel, cobalt, and manganese) within the limonitic laterite ore were determined after total digestion with a mixture of acids, including hydrofluoric acid (HF), hydrochloric acid …
With the aim of intensification, improving economic efficiency, and controlling sulfide ore heap bacterial leaching features and leaching regimes are studied for lean copper-nickel ore with the participation of a bioreagent-oxidant prepared by iron-oxidizing micro-organisms and concentrated adsorption immobilization in a separate …
A characteristic feature of serpentine oxidized nickel ores (ONO) of the Serov deposit (≈ 1 wt.% Ni) is the increased content of iron and magnesium. The main nickel-containing phases are lizardite, antigorite, clinochlore and iron oxides with the nickel content varying from 1.6 to 9.2 wt.%.Heap (percolation) leaching with aqueous H2SO4 …
Leaching of nickel laterite ore at atmospheric pressure is a leaching method that can be operated at >100⁰C temperatures in an atmospheric pressure, which is …
1. Introduction. The acid-leaching tailings of laterite nickel ore are a hazardous waste generated by the laterite nickel ore industry [1], [2], [3].As global demand for nickel continues to rise and nickel sulfide resources decrease, the extraction of nickel resources from laterite nickel ores the main development trend of the global nickel …
The aims of the present work were to investigate the leaching characteristics of Sc in two different types of laterite nickel ore from Indonesia during atmospheric acid leaching. Based on the leaching results, the kinetics and mechanism of Sc dissolution from limonitic and saprolitic laterite material, especially the relationship and ...
The lateritic nickel ore sample taken from the Çaldağ (Manisa, Turkey) was used in this study. The chemical analysis of the ore as carried out using PerkinElmer-OPTIMA8300 inductively coupled plasma spectroscopy (ICP) and Thermo Fisher- QUANT'X EDXRF X-Ray fluorescence spectroscopy (XRF) is given in Table 1.The mineralogical …
The leaching behavior of nickel and iron in limonite-type laterite nickel ore was studied through ammonium hydrogen sulfate atmospheric leaching. The leaching temperature, ammonium bisulfate concentration, reaction time, and acid excess rate during the nickel dissolution process were optimized using the response surface methodology …
Interestingly, another patent was filed by Outotec Oyj in the same year for a chloride leach process for treatment of nickel sulfide ore and concentrates, key differences in this process were the absence of a non-oxidative leaching step, copper(II) was precipitated from the leach liquor as atacamite (Cu 2 (OH) 3 Cl) which was returned to …
The leaching mechanism of laterite nickel ore in acidic solution was studied by comparing the XRD patterns of different leaching residues and raw ore to observe any changes in characteristic peaks. The leaching temperature, acid concentration, and leaching time as important parameters for the leaching process …
Image: Agglomerator for a nickel ore heap leaching operation in SX-EW. ... Image: Nickel Ore Dryer. Some novel processes may employ pelletizing at this stage of the process, where drying also facilitates pulverization of the ore in preparation of processing on a disc pelletizer. Pelletizing may also be used as a means of reintroducing recycle ...
To effective use the residual acid in the pregnant solution, two steps AL process were proposed. For the leaching solution of limonite ore, reactive nickel laterite ores with high-magnesia could be utilized as neutralizer to compensate the acid cost, and the iron in the liquor could be precipitated as jarosite.
This research aims to study two-stage iron precipitation behavior as a part of the purification process of pregnant leach solution of nickel limonite ore obtained from high-pressure acid leaching (HPAL) at 240°C and to investigate the effect of several variables of the extraction of scandium from the precipitate re-leaching at atmospheric ...
Laterite ore is a valuable resource due to its high content of metals essential for modern technology, including nickel, iron, and cobalt. However, extracting nickel from laterite ores is challenging due to their complex mineral composition and low nickel concentrations. This study examined the leaching behavior of pre-roasted laterite ore …
1. Introduction. Nickel is an important alloying metal that has strategic importance for a wide range of industrial applications due to the nickel alloys high strength and ductility as well as excellent corrosion and heat resistance (Rao et al., 2013).Laterite ore, which makes up 60% of commercially important nickel sources usually exhibits …
A different number of circulations of leaching solutions was used during leaching with the aim of increasing the nickel content. A dependence is shown in Fig. 3a–c for nickel concentration on the number of circulations leaching solution in stages of 10%, 20%, and 50% nickel extraction in percolator No. 2. A marked increase in nickel …
Key Terms. ore leaching: The process of recovering metals from ores by using a number of different techniques.; Microbial ore leaching (bioleaching) is the process of extracting metals from ores with the use of microorganisms. This method is used to recover many different precious metals like copper, lead, zinc, gold, silver, and nickel.
High-pressure acid leach (HPAL) residue from laterite nickel ore is a potentially valuable resource for ironmaking; however, its efficient utilization is hindered by its high sulfur content. In this study, an effective and straightforward method is proposed for sulfur removal from HPAL residue. The process involves sieving and sodium carbonate …
The leaching kinetics study shows that nickel extraction from limonite ore by a mixture of 2 M sulfuric acid and 0.5 M citric acids is controlled by diffusion through …
Limonite, which has low magnesium-silicon oxide and nickel content, are usually processed by hydrometallurgy, such as high-pressure atmospheric leaching (HPAL) and atmospheric leaching (AL). The magnesium content in nickel ore is limited to 5 wt% due to the economically acid needs [5] .
HL is an industrial process, and ore is left for steady-state operation at ambient temperature. The process has low recovery, with ~ 68–71% nickel extraction. The heap leach operation prefers a low ratio of limonite to saprolite ore . Two commercial operations were reported for HL in the …
Semantic Scholar extracted view of "Leaching Kinetics of Limonite-Type Laterite Nickel Ore from Ammonium Hydrogen Sulfate Solution at Atmospheric Pressure" by Yi Wang et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 220,736,361 papers from all fields of science ...
The ore sample used in the work was low-grade nickel sulfide ore provided by Jinchuan Group, China. The chemical composition of the ore analyzed by XRF (XRF, S8 TIGER II, Germany) was shown in Table 1. It can be seen that the valuable metals contained in the ore are nickel and copper, with the content of 4.63 % and 2.75 %, respectively.
Agatzini-Leonardou S & Dimaki D, Heap leaching of poor nickel laterites by sulfuric acid at ambient temperature, Hydrometallurgy, (1994) 193-208. Book Google Scholar Ucyildiz A, Girgin I, High pressure sulphuric acid leaching of lateritic nickel ore. Physicochemical Problems of Mineral Processing, no. 1, 53(2017) 475-88.
The leaching kinetics study shows that nickel extraction from limonite ore by a mixture of 2 M sulfuric acid and 0.5 M citric acids is controlled by diffusion through solid product layer, while the nickel extraction from saprolite ore by a mixture of 0.5 M sulfuric acid and 2 M citric acid is controlled by interface reaction with activation ...
Highlights Leaching temperature, leaching duration, sulfuric acid to ore weight ratio and particle size of the limonitic nickel laterite ore were studied. Optimum …
A new process of extracting silica from laterite nickel ore by hydrothermal treatment with sodium hydroxide as reaction auxiliary agent was proposed. The mineralogical transformation and silicon extraction kinetics of laterite nickel ore in alkaline hydrothermal treatment were studied. The effects of reaction temperature (175 ~ 250℃), …
Nitric acid pressure leaching process (NAPL) uses nitric acid as the leaching medium to produce cobalt and nickel raw materials. Based on the benefits of nitric acid pressure leaching process for laterite ore, this paper proposes a process of "nitric acid pressure leaching-neutralization precipitation-reductive ammonia leaching separation".
The limonitic laterite ore was obtained from Papua New Guinea and dried at 105 °C for 24 h. The amounts of metal elements (iron, magnesium, aluminum, …
During leaching of oxidized nickel ore (ONO) to a level of 89% nickel extraction there is a change in the grain size composition of solid residues with an increase in fine phase – 21.5 + 0 mm by a factor of two compared with the original ONO composition, which is connected with "self grinding" of ore during leaching. ...
In this process, the leaching of a nickel laterite ore generates a pregnant leach solution containing more than 10–30 g/L Fe(III) that is used for the leaching nickel sulphide ore either sequentially or simultaneously. …
Highlights Leaching temperature, leaching duration, sulfuric acid to ore weight ratio and particle size of the limonitic nickel laterite ore were studied. Optimum parameters determined as 255 o C, 0.30 sulfuric acid to ore weight ratio, a particle size of −850μ, 1 h of leaching duration with 30% w/w. 87.3% of Ni and 88.8% of Co in …