Abstract A new process is developed for metallurgical beneficiation of iron laterite nickel-containing (limonite) ores with the formation of a metallic nickel–cobalt concentrate. This process includes reducing roasting of the ores with sulfur-containing additions in the temperature range 1100–1200°C, the fragmentation of the roasting …
قرأ أكثر
The preconcentration of nickel (Ni) laterite ores ahead of Ni recovery by hydrometallurgical processing makes good economic sense. Since Ni-bearing minerals are often finely disseminated through laterite ores, liberation of minerals either high and/or low in Ni content is a prerequisite prior to any form of separation process.
قرأ أكثر
Nickel laterite ore is used to produce nickel metal, predominantly to manufacture stainless steel as well as nickel sulfate, a key ingredient in the batteries that drive electric vehicles. Nickel laterite production is on the rise and surpassing conventional sulfide deposits. The efficiency of mining and processing nickel laterites is defined by …
قرأ أكثر
Laterite ore is one of the important sources of nickel (Ni). However, it is difficult to liberate Ni from ore structure during reduction roasting. This paper provided an effective way for a robust recovery of Ni from laterite ore by H2 reduction using sodium thiosulfate (Na2S2O3) as a promoter. . It was found that a Ni content of 9.97% and a Ni recovery of 99.24% …
قرأ أكثر
The chemical assays of the laterite samples are provided in Table 2. The nickel head grade of ores L, I and S (at <300 μm size fraction) was found to be 1.2%, 1.1%, and 3.0%, respectively. Nickel was found, more or less, at the same grade in all size fractions in these laterite ore samples.
قرأ أكثر
In this paper, the reduction roasting of laterite ore in the absence or presence of sodium sulfate was carried out for nickel beneficiation by wet magnetic separation. Sodium sulfate is found to be capable of enhancing the reduction of laterite ore through liberating iron and nickel from Ni/Fe substituted-lizardite, as well as increasing the size of ferronickel …
قرأ أكثر
Abstract. From the magnificent red and yellow potmarked temples of Cambodia to the durable smooth roads of Gabon, laterite is a stone of a thousand uses. Many are well known to the modern engineer—yet many still lie buried beneath green vines, shifted sands, or cracked stucco. Download to read the full chapter text.
قرأ أكثر
The chemical analysis of laterite soil samples sourced from literature, Table 1 showed that the major compounds present in the laterite soil are SiO 2, Al 2 O 3, and Fe 2 O 3.These compounds were predominantly more than 70% of total composition of oxide compounds, and in some cases, it reached about 92±5% (Jan et al., 2007; Marto et al., …
قرأ أكثر
The results of beneficiation studies showed that iron and silica content can be reduced from low grade bauxite and laterite . The salient features and results obtained …
قرأ أكثر
Abstract. Bauxite is the major alumina (Al2O3) bearing ore used in the aluminum manufacturing industries. The bauxite containing less than 50% Al2O3 is called low-grade bauxite ore which is commonly used for the alumina-based abrasives and refractories productions. The alu-mina-silica and alumina-ferrite complexes are the fore-most …
قرأ أكثر
40 nickel laterite samples from New Caledonia plus 6 samples from processed laterites were analyzed for this case study. The 40 samples are from both laterite and saprolite horizons of the nickel laterite profile, Figure3. To guarantee a reproducible and constant sample preparation for the XRD measurements, the samples …
قرأ أكثر
Laterite contains high iron oxide (25-45 %), high silica (6-15 %), low alumina (25-35 %) and titania (2-4 %). In some deposits (Kolhapur), laterite contains very low silica (2%). Mineralogical analysis by XRD shows that laterite is comprised of hematite, goethite, kaolinite and gibbsite minerals. The petrology studies
قرأ أكثر
Ni laterite ores are mainly classified as silicate and oxide deposits, where each laterite type may contain both silicate and oxide gangue minerals in varying proportions. The oxide deposits are characterised by three different zones: goethitic/limonitic, saprolitic and bedrock (Chen et al., 2004). On the basis of the …
قرأ أكثر
2.3 Direct reduction of laterite nickel ore in industrial scale Most laterite nickel ore processing is carried out using Elkem process. The Elkem process uses Rotary Kiln and Electric Furnace (RKEF) to reduce and smelt laterite nickel ore. Commercialization of Elkem process itself began with the development of a pilot plant in 19531954. At ...
قرأ أكثر
Process mineralogy of low-grade laterite nickel ore in Indonesia was systematically characterized and the beneficiation process of mineral components such as limonite, serpentine and chromite was studied on the basis of process mineralogy. The results show that the low-grade laterite nickel ore is a typical weathering sedimentary …
قرأ أكثر
Laterites are generally processed through hydro or pyro-metallurgy and therefore, pre-concentration of nickel before such processes is very important. This paper examines the effects of different physical methods on pre-concentration of nickel in laterite ores. The effect of ore mineralogy on choosing the best strategy to upgrade …
قرأ أكثر
Lateritic deposits are a type of weathering product that forms in tropical and subtropical regions through the process of laterization. Laterization involves the leaching of silica and other soluble materials from rocks, leaving behind a residual concentration of iron and aluminum oxides. The resulting deposits, known as laterites, are characterized by …
قرأ أكثر
Three main processes for cobalt extraction can be distinguished: a) hydrometallurgy, b) pyrometallurgy and, to a lesser extent, c) vapometallurgy. The processes involved and flowsheets employed depend on the ore mineralogy and are usually unique to the ore deposit type and even the ore type. 5.1. Overview.
قرأ أكثر
Abstract: Process mineralogy of low-grade laterite nickel ore in Indonesia was systematically characterized and the beneficiation process of mineral components such …
قرأ أكثر
Mark I. Pownceby. Australia has large reserves of limonite and clay-based laterites that are currently underutilized. This review summarizes the latest nickel laterite upgrading studies reported in the literature which use physical beneficiation – only …
قرأ أكثر
All Australian laterite operations crush the ore then reject particles greater than 1 mm to 2 mm, and the target nickel recovery in these processes is typically 70% (David 2008; Nice 2004;Quast et ...
قرأ أكثر
To improve beneficiation of nickel and iron from low-grade saprolite laterite with 1.29 wt.%Ni and 16.31 wt.%Fe, co-reduction with limonitic laterite ore and basicity …
قرأ أكثر
Keeping the above characteristics in view, several west coast lateritic bauxite mines of India employ dry crushing−screening process to bring down silica content from the metallurgical grade bauxite [].Recently, a bauxite mine of Guinea known as AGB2A has also adopted the dry beneficiation procedure to cut down silica from about 7% to below 3%, …
قرأ أكثر
Nickel laterite ore is used to produce nickel metal, predominantly to manufacture stainless steel as well as nickel sulfate, a key ingredient in the batteries that drive electric vehicles. Nickel laterite …
قرأ أكثر
Magnesium chloride and HCl brine leaching are used to extract nickel and cobalt from laterites. This system has the advantage of allowing direct control of iron …
قرأ أكثر
The laterite ore was crushed and ground to 80 wt.% passing 0.074 mm.The ground laterite sample was thoroughly mixed with sodium sulfate (the amount of sodium sulfate addition varied from 0 wt.% to 20 wt.%) for preparing non-coal-burdened pellets with diameter of 12–16 mm. Lignite was crushed and screened to a size range of 0.5–2.0 mm …
قرأ أكثر
China mainly imports laterite from the Philippines, of which 50% is limonite laterite with very low nickel content (about 0.8% Ni), high iron grade (about 40%), and crystal water content [8]. ...
قرأ أكثر
The analysis results are shown in Figure 8. According to Figure 8, the grades of Cr and Fe in chromite of laterite nickel ore are 35.99% and. Figure 8 Analysis result of chromite phase by EDS. 16.89% respectively, and the grade of Cr is much higher than the average grade of Cr of laterite nickel ore.
قرأ أكثر
The iron ore industries of India are expected to bring new technologies to cater to the need of the tremendous increase in demand for quality ores for steel making. With the high-grade ores depleting very fast, the focus is on the beneficiation of low-grade resources. However, most of these ores do not respond well to the conventional …
قرأ أكثر
Extensive studies carried out on the characterisation and beneficiation of the laterites indicated that the concentration of Ni could at best be enriched to a value of …
قرأ أكثر
This review summarizes the latest nickel laterite upgrading studies reported in the literature which use physical beneficiation – only studies reported after the most …
قرأ أكثر
1. Introduction. In lateritic nickel ore, nickel is associated with iron phase where as cobalt is associated with manganese phase [1]. Natural Fe (III) oxides are high in surface area and are reactive [2]. Fe (III) oxides adsorb a wide range of metal cations and anions by complexation to surface hydroxyl groups [3].
قرأ أكثر