11.37–8.91 Apatite: 86.86–91.86 Single pure [7] 4.45 Apatite: 87.10 Pure mixture 74 + 38 Reverse 31.37 Apatite: 64.89 Single pure [33] 106 + 38 Reverse ~10 Monazite: 37 Single pure [34] 106 + 38 Direct 66 Monazite: 29 Single pure 212 + 150 Reverse 18 Apatite: 87.7 Single pure [14] 212 + 150 Reverse ~20 Apatite: 80 Pure mixture 106 + 38 ...

This chapter introduces the principle of how low-grade iron ores are upgraded to high quality iron ore concentrates by magnetic separation. Magnetite is the most magnetic of all the naturally occurring minerals on earth and can be readily extracted by …

Iron ores are associated with undesirable gangue minerals such as silica, clays, alumina, calcite and apatite. Standard physicochemical methods such as froth flotation and gravity separation (spiral concentrator, jigging, heavy media separation) used to separate the gangue minerals from hematite are considered to be expensive and are …

The effectiveness of the smelting process is based on the quick and efficient separation of immiscible layers and the separation of the matte from a slag containing …

Deep dephosphorization of high‑phosphorus oolitic iron ore (HPOIO) is extremely difficult because of its refractory characteristics. A new approach for simultaneous iron recovery and dephosphorization from HPOIO by oxidation roasting–gas-based reduction (ORGR) and magnetic separation process was developed.The underlying …

apatite to the slag, gas phase, and metallic iron. Results indicated that the optimal experimental conditions for achieving high recovery ratios of metallic iron and high ...

The prepared Fe3O4@Cu-apatite was used as a nanocatalyst for N-arylation of imidazole with a series of arylboronic acids with different substituents to reaffirm the effectiveness of this magnetic ...

Apatite minerals are readily floated using anionic collectors such as fatty acids. At LKAB (Luossavaara-Kiirunavaara AB) in Kiruna, Sweden, the dephosphorization of a magnetite ore is conducted using magnetic separation and flotation. In the flotation process, the apatite minerals are floated with a fatty acid based collector.

Magnetite-(apatite) ore deposits are interpreted as being formed by the crystallization of iron-rich ultrabasic melts, dominantly generated by the interaction of silicate melts with oxidized P-F-SO4-bearing sedimentary rocks. This hypothesis is supported by geologic evidence, experimental studies, numerical modeling, stable and radiogenic …

Physical Properties. Apatite is best known for its use as an index mineral with a hardness of 5 in the Mohs Hardness Scale. It is usually green in color, but can be yellow, brown, blue, purple, pink, or colorless. These colors are often so vivid that apatite has frequently been cut as a gemstone. Apatite is a brittle material.

These minerals are generally separated by flotation and/or magnetic separation (in the case of iron impurities). Calcite ores typically contain metal sulphide, silicate, or other calcium-containing impurity minerals, which can be removed by flotation. ... Holmberg K (2015) Flotation selectivity of novel alkyl dicarboxylate reagents for apatite ...

The magnetic separation results indicated that Mo and Cu were enhanced in magnetic products by 34–41 and 15–21%, respectively. Cleaner non-magnetic residues were found to decrease significantly by 37–44, 58–60, and 11–19% for Cu, As, and Cr, respectively. Mineral fractionation was observed instead of chemical changes during …

In this study, bio-inspired urchin-like structured hydroxyapatite (UHdA) and its magnetic composite ([email protected]3O4) were developed for efficient and easy separation of cerium ions (Ce³ ...

To improve the magnetic separation efficiency, several novel separation system based on magnetic NPs have been developed, such as Fe 3 O 4 @SiO 2 @P(St-MA)/Ni-NTA ... and the composite coatings were found to enhance the apatite mineralization, as affirmed by SEM-EDX analysis. The assessment of hemocompatibility …

Open access. Published: 17 October 2022. Genetic model of the El Laco magnetite-apatite deposits by extrusion of iron-rich melt. Tobias Keller, Fernando Tornos, John M. …

All samples were analyzed for whole-rock geochemistry, LA-ICP MS apatite U-Pb dating, and apatite geochemistry. After crushing the rock samples, apatite grains were separated by standard heavy liquid and magnetic separation techniques, and then handpicked under a binocular microscope, mounted in an epoxy resin, and polished.

However, the separation performance of the flotation was lower at pH 7 regardless of the collector concentration. Thus, more collector molecules are adsorbed on the quartz surface than the apatite surface at pH 3 and 5 × 10 −5 M of collector, resulting in separation of quartz and apatite. The extended Derjaguin–Landau–Verwey–Overbeek ...

After crushing the rock samples, apatite grains were separated by standard heavy liquid and magnetic separation techniques, and then handpicked under a …

Three different types of heavy liquids and a magnetic separator (Frantz) can be found in the mineral separation room. This room is mostly used for separating heavy minerals - like zircon, monazite and apatite - from lighter minerals. Zircon and monazite are important minerals for U/Pb dating with the help of laser ablation and a mass spectrometer.

In previous studies, we synthesized the magnetic core-shell structured Fe 3 O 4 /PMG/IDA-Ni 2+ nanoparticles. The Ni 2+ on the surface of nanoparticles provides abundant docking sites for histidine, and the composite nanoparticles showed potential applications in the separation and purification of histidine-tagged (His-tagged) proteins. Meanwhile, the …

The objective of this paper is to investigate the efficient condition for leaching of REEs from apatite-iron ore sample using magnetic separation and leaching with the sulphuric acid solution. Ore ...

After magnetic separation, basic leaching tests were conducted to investigate the influence of the acid type and concentration, temperature, and the pH on the REE leaching level and ... Intuitively, it is possible to obtain REE concentrates by selective separation of REE-bearing apatite from the ore. Froth flotation is a common …

This chapter introduces the principle of how low-grade iron ores are upgraded to high-quality iron ore concentrates by magnetic separation. Magnetite is the most magnetic of all the naturally occurring minerals on earth, so low-intensity magnetic separators are used to upgrade magnetite ores. ... Apatite: 0.007–0.142: Ca 5 (PO4) 3 …

Under the optimal conditions: coke dosage of 6%, reducing temperature of 1400 °C and time of 120 min, a magnetic concentrate with 4.18% Nb, 4.60% Ti and 70.57% Fe can be obtained followed by wet magnetic separation. The corresponding recoveries of Nb, Ti and Fe were 70.5%, 59.8% and 92.6%, respectively.

Physical separation methods used for the REE recovery include gravity separation, magnetic separation, and electrostatic separations. These methods are usually used in combination. ... Apatite was the main REE carrier in the samples, with an average REO content of 14.7%, and the highest values reached 20.8%. There was a …

Magnetic susceptibility measurements of phosphate and silicate apatites of the A 10−2x Ln x M x (PO 4) 6 Y 2 (A = Sr,Pb; Y = F, Cl; x = 1,2) and Sr 2 Ln 8 (SiO 4) 6 O 2 types with Ln = Nd and Gd showed no magnetic order of the rare earth ions down to liquid He temperature. Temperature dependence showed theoretical contributions of the …

Physical methods such as gravity concentration, magnetic separation and flotation are standard practices to separate the gangue minerals from iron ores. However, the ores …

Multi-heavy mineral separation techniques like density, magnetic, and electromagnetic techniques are followed by picking, grain counting, and mineralogical examinations conducted with an ...

The characteristics of siderite reductive ore and the ultrafine grinding-magnetic flocculation separation (MFS) of this ore were investigated in the present work. The results indicated that the iron phase in the raw ore was predominantly metallic iron with an iron particle size below 30 μm, and the phosphorus compound was apatite. By …

Hierarchical Fe 3 O 4 @Cu-apatite nanoparticles (NPs) were synthesized via a facile hydrothermal method.The Fe 3 O 4 cores present spherical shape and have a mean diameter of 300 nm, and the Cu-apatite shell with thickness of about 50 nm is composed of a large number of sheets. Using the high affinity of Cu 2 + on the surface toward histidine …

Hierarchical Fe3O4@Cu-apatite nanoparticles (NPs) were synthesized via a facile hydrothermal method. The Fe3O4 cores present spherical shape and have a mean diameter of 300nm, and the Cu-apatite shell with thickness of about 50nm is composed of a large number of sheets. ... Selective binding and magnetic separation of histidine …

Nature Communications - Magnetite-apatite (MtAp) deposits are an important source of iron and critical metals, yet their ore genesis is poorly …

After magnetic separation, basic leaching tests were conducted to investigate the influence of the acid type and concentration, temperature, and the pH on the REE leaching level and ... Intuitively, it is possible to obtain REE concentrates by selective separation of REE-bearing apatite from the ore. Froth flotation is a common process ...

During coal-based reduction, the iron minerals were reduced to metallic iron and grew into the metallic phase. The apatite was also reduced and enriched in the metallic iron phase. After two-stage grinding and magnetic separation, a P-rich DRI powder of 93.26% Fe and 1.62% P was obtained with 93.41% Fe recovery and 71.27% P recovery. …

Magnetic mineral inclusions in silicates are widespread in sediments as well as in igneous rocks. Because they are isolated from surrounding environment, they have potential to preserve original magnetic signature even in chemically altered sediments. Such inclusions may provide proxies to help differentiating the source of the host silicate. …