Thus the ratio of nickel to iron in Indian laterites are adverse towards any possible exploitation for ferro-nickel manufacture. Extensive studies carried out on the characterisation and beneficiation studies on the laterites indicate that the concentration of nickel can at best be enriched to a level of 1.1% without much change in the nickel ...
In addition to the dissolution of iron and nickel, the concentration of dissolved cobalt and manganese also increases during the bioleaching of the laterite ore. Bio-processing of lateritic ores under anaerobic conditions contained higher amounts of dissolved manganese, nickel, iron, and cobalt within 20 days compared to aerobic conditions.
This paper reviews the nature and genesis of nickel laterite mineralisation, and describes the relationship between deposit characteristics (both geological and non …
Nickel laterite deposits – geological overview, resources ... Well-known examples of important lateritic ore deposits are aluminous bauxite and enriched iron ore deposits, but lesser known ...
Multiple-compaction demonstrates cyclic loading on laterite soils used in highway construction and its effects on engineering properties. ... the presence of iron oxides 1,2. Laterite soil is ...
The higher values of specific gravity in laterite soils are generally associated with soils rich in iron oxides and titaniferous minerals (Maignien, 1966). 9.1 DETERMINATION OF THE SPECIFIC GRAVITY OF NATURAL SOILS There are several methods for the determination of the specific gravity which only differ in detail …
In this study, we present mineralogical and geochemical characterization of samples systematically collected from a nickel laterite profile at the Sta. Cruz nickel …
It is well known that an accurate estimation of Ni reserves is difficult in laterite deposits because of the complexity of geological structure, local changes in degree of weathering even in the same lithology, strong heterogeneity of Ni grade distribution, differences in Ni concentration patterns such as vein or disseminated ore body, and the ...
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 …
The main contributions of this project in the Ni laterite deposit model are the following: Widening deposit data on Ni laterites around the world, increasing the number of deposits by 65 percent in the database, and improving confidence in the tonnage-grade model.
The optimum values of the variables for the efficient pre-concentration were determined based on the separation efficiency. The characterization and preliminary separation studies indicated that gravity-based separation could be opted for the pre-concentration of such mixed copper ore.
Based on a brief introduction of properties of metallic nickel, it summarizes the applications of nickel, demand of nickel, resources of nickel, and metallurgical …
At a deposit scale, magnetic, gravity, electromagnetic, electrical, and ground-penetrating radar methods can be useful in delineating the weathering profile of the Ni-Co laterite …
The laterite deposits may be described on the basis of the dominant extractable minerals in it: (i) aluminous laterite (bauxite), (ii) ferruginous laterite (iron ore), (iii) manganiferous laterite (manganese ore), (iv) nickeliferous laterite (nickel ore) …
Nickel-cobalt (Ni-Co) laterite deposits are an important source of nickel (Ni). Currently, there is a decline in magmatic Ni-bearing sulfide lode deposit resources (Dalvi and others, 2004). ... large concentration of iron and hardened upon surface exposure. Buchanan's application of the term is
A limonitic laterite sample from Sarchahan deposit (Fars province, Iran) containing 0.8% Ni and 27.3% Fe was used for the experiment and dissolution behavior of nickel and iron during the course of long time leaching runs (52 h) was studied under the influence of temperature (60–90 °C) and oxalic acid concentration (0.75–1.25 M).
Statistical tests were performed to determine if delineated subtypes and groups of Ni-Co laterite deposits (such as mineralogical, shape, and age groups) are …
The nickel laterite in upper layer of the ore deposit, with higher content of iron (Fe) and lower content of silica (SiO 2) and magnesium (Mg) in general, belongs to the limonite type, and usually contains lower nickel of about 1%, but a certain amount of cobalt (Co), while the nickel laterite in lower layer of the ore deposit, with higher content of …
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 …
The mineralogy of laterites varies substantially depending on location, weather, and depth, and the primary host minerals for nickel and cobalt include goethite (iron oxide), nontronite (clay), and manganese oxides . Laterite deposits are found at levels ranging from 0 to 40 m below ground level.
Laterite soils are mainly composed of aluminum, silicon, and iron oxides and may contain crystalline phases such as quartz, kaolinite, halloysite, goethite, hematite, and ilmenite [4–11]. The bulk density of laterite depends on its chemical composition, which typically varies widely from 0.9 to 3.6 g/cm 3.
cobalt laterite deposits illustrating the loss of magnesium (Mg) and silicon (Si) along with the concentration of nickel (Ni) and iron (Fe) as the weathering profile …
We call the amount of known ore in a deposit the reserves. The concentration of a commodity in the ore (the "richness" of ... create fine particles of sulfide minerals and produce massive ore deposits. The iron sulfides that are the most common minerals created, are black, so the name. The ores mined from the Kidd, Windy, Craggy, Rio …
Australian Ni laterites from the same overall deposit, but with dif- ... It was shown that gravity concentration using a shaking table at ... Investigation of pre-concentration of two high-iron ...
The process of forming nickel laterite deposits is essentially similar to the formation of gold laterite deposits, except that ultramafic or mafic rocks are required. Generally nickel laterites require very large olivine-bearing ultramafic intrusions. Minerals formed in laterite nickel deposits include gibbsite.
Generally, laterite ore deposits can be divided into three different layers from top to bottom, namely, limonite layer, transition layer and saprolite layer [30, 31], as shown in Figs. 1.8 and 1.9. Due to long-term weathering and eluviation, the nickel grade of limonitic laterite ore is the lowest while the iron grade is the highest.
Magmatic sulphide and laterite deposits are the two major sources of the nickel metal in the world. ... The deposit has been mined for direct shipping of iron ore to cement factories. ... Nickel is mainly associated with goethite mineral with an average of 1.4% concentration with an inferred resource of over 1 Mt. Nearly 200 kt Ni-laterite ore ...
Highlights • Ni grade in laterite ores was increased using magnetic and gravity separation. • Ni bearing serpentine were separated from heavier minerals with a Falcon concentrator. • The mineralogy of Ni laterites affects upgrading consideration by …
The Intex laterite deposit in Mindoro, Philippines is derived from the weathering of the ultramafic rocks under a tropical climate. This study investigates the several types of serpentines and the effect of the degree of chemical weathering of ultramafic rocks and laterites on the enrichment of Ni in the deposit. The five types of …
حقوق النشر والنسخ؛ 2024.Aava جميع الحقوق محفوظة.خريطة الموقع