Magnetic separation had shown promises for some of the bauxite ores (Bhagat et al., 2001, Bhagat et al., 2006). In this study, magnetic separation studies were carried out using a dry perm roll magnetic separator as shown in Fig. 4.18. Different …

As seen in Fig. 1, 95.31% Fe recovery ratio by magnetic separation of roasted ore at a grinding fineness of 90%–74 μm was obtained, implying that iron oxides in this raw ore could be successfully magnetized via reduction roasting using alkali lignin as reducing agent, however the Fe grade of iron concentrate was only increased from …

This work presents a semi-smelting reduction and magnetic separation process for the recovery of iron and alumina slag from iron rich bauxite ore. The effect of the process parameters on the recovery rate of iron, maximum particle size of the iron nugget, and the Al2O3 content of the alumina slag was investigated and optimized. The …

In some cases, reduction roasting followed by magnetic separation may be effective, depending on chemical and mineralogical characteristics of the bauxite. An acid leaching process can also be employed on physically beneficiated bauxite to lower the iron content to the level of 2–3% Fe 2 O 3 .

Abstract The article describes the tests of thermal treatment effects on magnetic properties of bauxites and the results of their dry magnetic separation. Under increasing temperature in a muffle furnace to 600 °C, the magnetic susceptibility of treated bauxites decreases. The thermal radiation modification of bauxite by accelerated …

The bauxite ore residue obtained from the Bayer process were ground to 98% passing 74 μm in particle size for magnetic separation . The recovery of iron by magnetic separation and TFe and content of TiO 2 of magnetic fraction and non-magnetic fraction were analyzed respectively.

Magnetic separation. The bauxite ore residue obtained from the Bayer process were ground to 98% passing 74 μm in particle size for magnetic separation . …

A technical route has been proposed to upgrade diasporic bauxite ores for iron and alumina enrichment based on reductive roasting, followed by magnetic separation and alkaline leaching. The thermodynamic analysis revealed that by reductive roasting of the bauxite ore at 980–1100°C, hematite in the ore is transformed to magnetite and kaolinite …

Bauxite is the major alumina (Al 2 O 3) bearing ore used in the aluminum manufacturing industries.The bauxite containing less than 50% Al 2 O 3 is called low-grade bauxite ore which is commonly used for the alumina -based abrasives and refractories productions. The alumina -silica and alumina -ferrite complexes are the foremost …

A study of reduction and magnetic separation of iron from high iron bauxite ore [J]. Canadian Metallurgical Quarterly, 2012, 51(4): 424âˆ'433. [7] SADLER L Y, VENKATARAMAN C. A process for enhanced removal of iron from bauxite ores [J]. International Journal of Mineral Processing, 1991, 31(3âˆ'4): 233âˆ'246. [8] JAMIESON E, …

A technology for suspension magnetization roasting−magnetic separation was proposed to separate iron minerals for recovery. The optimum parameters were as follows: a roasting temperature of 650 °C, a roasting time of 20 min, a CO concentration of 20%, and particles with a size less than 37 μm accounting for 67.14% of the roasted product.

Semi-smelting reduction followed by magnetic separation was used to separate iron and aluminum from iron rich bauxite; the recovery rates of the iron and Al 2 O 3 grade of the alumina slag were 96.84 wt% and 43.98 wt%, respectively [14]. Smelting-reduction process was also used to separate iron from bauxite.

In order to produce a raw material suitable for sponge, the microwave reduction roasting and wet magnetic separation process of red mud was reported, ... Chambers B, et al. A study of reduction and …

It contains around 30-50% iron oxide depending upon the quality of bauxite ore used in Bayer's process Due to its highly caustic-corrosive nature and fine particle size it is considered toxic to the surrounding. ... Carbonated red mud concentrated with magnetic separation followed by muffle furnace roasting using suitable reductant produced a ...

Dry Magnetic Separation of Bauxite Ore R. Bhagat, B. Banerjee, +1 author B. Mukherjee Published 1 March 2006 Materials Science The paper describes the …

Bauxite is the ideal raw material for the manufacturing of alumina. Aside from the primary constituents of aluminum and silicon, bauxite is frequently coupled with …

The reduction sample was subjected to magnetic separation and a non-magnetic product (aluminum concentrate), with alumina recovery of 80.64% and iron removal of 85.32%, was obtained.

Iron tailings is the most common and largest mining waste, and given the serious social, economic, and environmental impacts caused by tailings, green and safe technologies are urgently needed for the efficient treatment of tailings. In the present work, efficient extraction of iron from flotation tailings via the suspension magnetization roasting …

Bauxite ore can be extracted from ore washing, flotation, magnetic separation, and chemical and physical methods to extract metal aluminum. Among them, flotation is a more commonly used method in …

The iron was enriched in the magnetic fraction as iron concentrate with iron content of 60.15 wt.% and iron recovery of 42.89% after reductive roasting of the bauxite ore at 1000°C for 20 min in ...

Concentration of ore is a step involved in the process of extraction of metal from its ore. Unwanted rocks and grit are eliminated from mineral ore in this process. Hydraulic washing, froth floatation process, magnetic separation and chemical separation are some of the techniques used for concentrating or purification of ores. Hydraulic washing:

High-Fe bauxite is a typical refractory bauxite with extensive resources, and coal gangue is a solid waste produced during coal preparation. ... Through magnetic separation, iron ore concentrate with 55.09% TFe and a recycling rate of 82.73%, and aluminum-rich products with Al 2 O 3 of 21.67% and a recycling rate of 75.55% were …

Magnetic separation Hydro cyclone Reduction roasting % Fe2O3 Iron recovery 1. Introduction Bayer process, invented by Karl Bayer in 1887 is used for …

The calcined sample at 800 °C requires magnetic intensity of about 7,000 Gauss, whereas the reduced bauxite needs less than 2,000 Gauss for separation of iron and the product obtained contains 76 % Al 2 O 3 with 62 % iron removal and 69 % Al 2 …

Bauxite ore is composed of aluminum-based minerals like gibbsite (Al(OH) 3), boehmite (γ-AlO(OH)), and diaspore (α-AlO(OH)) ... As a result, during the magnetic separation, other weakly or nonmagnetic ferrous phases like calcium alumino ferrite and hercynite can end up in the magnetic concentrate which decreases the iron recovery ...

bauxite, removal of iron impurities is achieved by magnetic separation technique. After drying and calcination the bauxite is subjected to magnetic separation. Dey et al. [13] performed the beneficiation of low-grade bauxite using magnetic separation for its use in refractories. Rao et al. [12] studied the effect of pre-treatment in separating ...

Magnetic separation Sulfuric acid leaching Introduction Bauxite ore residue is a hazardous byproduct derived from alumina production, approximately 0.8–1.5 tons of bauxite ore …

A new method of solid-phase reduction magnetic separation with pyrite as a reducing agent was proposed in order to realize resource utilization of high iron bauxite residue while reducing environmental harm. FeS2 powder and high iron bauxite residue powder were uniformly blended and roasted in a closed environment. A magnetic …

In this study, extraction of aluminum-, iron-, and titanium-bearing constituents from diaspore-type bauxite ores was investigated by stepwise treatment consisting of pre-desilication via alkali-leaching of bauxite ore, extraction of alumina via Bayer process, and recovery of iron from red mud via magnetic separation. The pre-desilication results …

The magnetic separator was used by Rao et al. to decrease the iron minerals so that they could be employed in refractory applications . Banerjee et al. employed a gaseous reduction technique followed by magnetic separation to lower the iron concentration in Jamnagar bauxite ore, which can be used as a refractory material …