fluidized bed magnetic separation iron ore roasting

Recovery and separation of iron from iron ore using ...

RECOVERY AND SEPARATION OF IRON FROM IRON ORE USING INNOVATIVE FLUIDIZED MAGNETIZATION ROASTING AND MAGNETIC SEPARATION J. Yu, Y. Han*, Y. Li, P. Gao *School of Resources and Civil Engineering, Northeastern University, Shenyang, China (Received 11 July 2017; accepted 17 November 2017) Abstract

(PDF) Fluidized bed roasting technology in iron ores ...

Fluidized bed roasting technology in iron ores dressing in China: A review on equipment development and application prospect ... Magnetizing roasting followed by magnetic separation is an ...

Fluidized bed roasting technology in iron ores dressing in ...

Magnetizing roasting followed by magnetic separation is an important method for the beneficiation of low grade iron ores. More attention has been paid to fluidized bed magnetizing roasting rather than shaft furnace and rotary kiln roasting in recent years. In this paper, the main characteristics of fluidized bed magnetizing roasting

[PDF] Fluidized bed roasting technology in iron ores ...

Magnetizing roasting followed by magnetic separation is an important method for the beneficiation of low grade iron ores. More attention has been paid to fluidized bed magnetizing roasting rather than shaft furnace and rotary kiln roasting in recent years.

(Received 20 May 2019; accepted 30 August 2019) Abstract

Fluidized bed roasting is known to be a very effective step for low-grade iron ores beneficiation when conventional methods such as froth flotation, gravity concentration, and direct magnetic ...

(PDF) Recovery and separation of iron from iron ore using ...

Recovery and separation of iron from iron ore using innovative fluidized magnetization roasting and magnetic separation.pdf Available via license: CC BY-SA 4.0 Content may be subject to copyright.

Recovery of iron from hazardous tailings using fluidized ...

Feb 01, 2020  Iron ore tailings have proved to be one of the most hazardous solid wastes. This paper presents an innovative technological method for recycling iron from tailings that involves coupling the magnetic separation preconcentration with fluidized roasting followed by low-intensity magnetic separation.

(PDF) Recent Advances in Magnetization Roasting of ...

The primary magnetization roasting methods include shaft furnace roasting, rotary kiln roasting, fluidized bed roasting, and microwave assisted roasting. ... magnetic separation, the iron

Comparison Tests between Magnetic Roasting in a Fluidized ...

This paper discussed the roles of magnetic roasting and the main factors that affect magnetic roasting. Mechanism research of magnetic roasting shows that feed size, roasting temperature, reducing atmosphere and roasting time are the main four factors. Comparison tests of magnetic roasting in a fluidized bed or in a fixed bed have been done.

Beneficiation of an iron ore fines by magnetization ...

Nov 10, 2017  In the magnetic separation tests, a Davis Tube Tester (model ø50) was employed. The roasted materials were ground to 85 wt% passing 38 μm in a ball mill (XMQ-Φ240 × 90), the flow rate of water was 1.2 L/min, the stroke rate was 75 strokes/min and the magnetic field intensity was set to 0.12 T.After the magnetic separation, the non-magnetic product was the tailing, while the magnetic ...

(Received 20 May 2019; accepted 30 August 2019) Abstract

Fluidized bed roasting is known to be a very effective step for low-grade iron ores beneficiation when conventional methods such as froth flotation, gravity concentration, and direct magnetic ...

Fluidized bed roasting technology in iron ores dressing in ...

Magnetizing roasting followed by magnetic separation is an important method for the beneficiation of low grade iron ores. More attention has been paid to fluidized bed magnetizing roasting rather than shaft furnace and rotary kiln roasting in recent years. In this paper, the main characteristics of fluidized bed magnetizing roasting

OUTOTEC ROASTING SOLUTIONS

pressure of the roaster gas. Our circulating fluidized bed technology enables the necessary fine control over these parameters. To avoid losses in the leaching plant, it is recommended that whole ores are treated with a gold-roasting step. Due to the low specific heat value of whole ore, it is generally necessary to add fuel to the reactor.

Comparison Tests between Magnetic Roasting in a Fluidized ...

This paper discussed the roles of magnetic roasting and the main factors that affect magnetic roasting. Mechanism research of magnetic roasting shows that feed size, roasting temperature, reducing atmosphere and roasting time are the main four factors. Comparison tests of magnetic roasting in a fluidized bed or in a fixed bed have been done.

The roasting of PGM-ore concentrates in a circulating ...

The roasting of PGM-ore concentrates in a circulating fluidized bed J. HAMMERSCHMIDT Outotec Metals Lurgi Metallurgie GmbH became part of Outotec in 2002. The company is now known as Outotec GmbH. It has been developing and applying different systems of fluidized-bed reactor to a variety of industrial processes for almost fifty years.

Mechanism of improved magnetizing roasting of siderite ...

Mar 12, 2019  A fluidized-bed magnetizing roasting–magnetic separation process was selected to treat this type of material. Phase transformations and microstructural changes in the product resulting from magnetizing roasting under different reducing gases (CO, H2, CO + H2) were clarified by vibrating sample magnetometry, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray ...

A new approach for recovering iron from iron ore tailings ...

Feb 01, 2020  Iron ore tailings, which are important secondary resources, have outstanding latent application value in iron recovery. In this study, a pilot-scale experiment on the iron recovery from iron ore tailings was investigated using innovative technology of pre-concentration and suspension magnetization roasting (SMR), followed by magnetic separation and flotation.

Factors Affecting the Upgrading of a Nickeliferous ...

faster in the fluidized bed compared to the tube furnace. The authors proposed that the ferronickel could be magnetically separated. Zevgolis et al. [13] reviewed the physicochemical properties of the reduction roasting of Greek laterite ores. The researchers concluded that the reduction degrees of the iron

Studies on the fluidization performance of a novel ...

Jan 15, 2020  Significantly high solids holdup in the FC is achieved ranging from 0.25 to 0.45 with a non-uniform axial flow structure, which is similar to that in a bubbling bed. Such a high solids holdup condition would ensure excellent heat and mass transfer rate in the proposed new fluidized bed reactor for the iron ore suspension roasting process.

Magnetic separation of ilmenite - Quebec Iron and Titanium ...

This material was roasted in a fluid bed fueled by natural gas at 750°C with a 3 percent O 2 atmosphere with an average retention time of 45 minutes. The combined fluid bed product was subjected to magnetic separation at 2500 gauss. The magnetic fraction represented 82 percent of the original ilmenite and contained 0.14 percent Cr 2 O 3.

Wet beneficiation of low grade iron ores, or tailings of ...

In the process, low grade iron ores are dry-ground, preferably to their liberation size passed through a fluidized bed roaster. The process uses coal gas for pre-heating for partial reduction. Hematite / limonite / goethite ores get converted into magnetite ore in 1-10 minutes depending on the size of iron ore, at temperatures of 500-600 ...

Efficient enrichment of iron concentrate from iron ...

Mar 13, 2020  Iron ore tailings are industrial solid wastes generated from mineral processing. The disposal of iron ore tailings leads to environmental threat and serious security because of their tiny particle size and large storage. In this paper, suspension magnetization roasting and magnetic separation technology were utilized to recover iron tailings. The results showed that iron concentrates with iron ...

Optimal Recovery of Iron Values from a Low Grade Iron Ore ...

A low grade iron ore containing 51.6% Fe, 17.6% SiO2, 4.3% Al2O3, and 3.8% LOI was subjected to reduction roasting followed by low intensity magnetic separation studies.

Growth behavior of the magnetite phase in the reduction of ...

To understand the formation and growth mechanism of the magnetite phase during the fluidized reduction of hematite, a high-purity hematite ore was isothermally reduced using a 20vol% CO?80vol% CO2 gas mixture in a micro-fluidized bed to examine the process of the selective conversion of hematite to magnetite. The micro-structural characteristics of the magnetite phase were investigated using ...

OUTOTEC ROASTING SOLUTIONS

pressure of the roaster gas. Our circulating fluidized bed technology enables the necessary fine control over these parameters. To avoid losses in the leaching plant, it is recommended that whole ores are treated with a gold-roasting step. Due to the low specific heat value of whole ore, it is generally necessary to add fuel to the reactor.

The roasting of PGM-ore concentrates in a circulating ...

The roasting of PGM-ore concentrates in a circulating fluidized bed J. HAMMERSCHMIDT Outotec Metals Lurgi Metallurgie GmbH became part of Outotec in 2002. The company is now known as Outotec GmbH. It has been developing and applying different systems of fluidized-bed reactor to a variety of industrial processes for almost fifty years.

Recent Advances in Magnetization Roasting of Refractory ...

This review highlights the developments in magnetization roasting of difficult to treat iron ores, including shaft furnace roasting, rotary kiln roasting, fluidized bed roasting, and microwave assisted roasting in the past decade. Fluidized bed roasting and microwave assisted roasting are considered as the most effective and promising methods ...

Laboratory study on magnetization reduction of CO

Based on these reports, we developed a fluidized bed reactor for magnetizing roasting of iron minerals in red mud. Under this process, iron minerals can be transformed into magnetite with the help of reducing atmosphere, and then the resulting magnetite can be collected by magnetic separation. In this study, we

magnitizing roast process flow for iron ore

Experiments of magnetizing roasting and low intensity magnetic separation on the ... at suitable roasting temperature,roasting time,roasting atmosphere,gas flow ... the process of the circulating fluidized bed(CFB)-stage grinding-two low intensity ... of Magnetization Roasting Technology for Refractory Red Iron Ores[J];Metal...

ON THE MAGNETIZING ROASTING OF THE Ni-Cr IRON ORE IN

(1) Fluidizing roaster was very effective for magnetizing roasting of fine iron ore. (2) On the over flow products: Iron recovery was about 90% in A ore and 85% in B ore. Iron content of the magnetic concentrates was about 60% in A ore and 50% in B ore. Nickel recovery was almost equal to that of iron.

Growth behavior of the magnetite phase in the reduction of ...

To understand the formation and growth mechanism of the magnetite phase during the fluidized reduction of hematite, a high-purity hematite ore was isothermally reduced using a 20vol% CO?80vol% CO2 gas mixture in a micro-fluidized bed to examine the process of the selective conversion of hematite to magnetite. The micro-structural characteristics of the magnetite

Magnetic separation of ilmenite - Quebec Iron and Titanium ...

This material was roasted in a fluid bed fueled by natural gas at 750°C with a 3 percent O 2 atmosphere with an average retention time of 45 minutes. The combined fluid bed product was subjected to magnetic separation at 2500 gauss. The magnetic fraction represented 82 percent of the original ilmenite and contained 0.14 percent Cr 2 O 3.

Characterization and technology of fast reducing roasting ...

YOUSSEF M A, MORSI M B. Reduction roast and magnetic separation of oxidized iron ores for production of blast furnace feed [J]. Canada Metallurgical Quarterly, 1998, 37(5): 419–428. CrossRef Google Scholar

Efficient enrichment of iron concentrate from iron ...

Mar 13, 2020  Iron ore tailings are industrial solid wastes generated from mineral processing. The disposal of iron ore tailings leads to environmental threat and serious security because of their tiny particle size and large storage. In this paper, suspension magnetization roasting and magnetic separation technology were utilized to recover iron tailings. The results showed that iron concentrates with iron ...

US20190112687A1 - Oxygen injection in fluid bed ore ...

Oxygen is injected into the windbox of a fluidized bed ore roaster to form a fluidizing and oxidizing gas stream of elevated oxygen content which is fed into only the feed zone into which the ore to be fluidized is fed. US20190112687A1 - Oxygen injection in fluid bed ore concentrate roasting - Google Patents ...

CA1037424A - Purification of ilmenite ore by oxidizing ...

ABSTRACT OF THE DISCLOSURE Purification of ilmenite from chromite impurities by a two step magnetic separation wherein magnetically susceptible chromite is magnetically removed, followed by an oxidizing roasting of the ilmenite and a subsequent magnetic separation of ilmenite from the remaining chromite impurities to obtain an ilmenite with 1% or less chromite.

US3935094A - Magnetic separation of ilmenite - Google Patents

Purification of ilmenite from chromite impurities by a two step magnetic separation wherein magnetically susceptible chromite is magnetically removed, followed by an oxidizing roasting of the ilmenite and a subsequent magnetic separation of ilmenite from the remaining chromite impurities to obtain an ilmenite with 1% or less chromite.

1. School of Resources and Environmental Engineering ...

demands of iron ores in iron and steel industry of China, were briefly described. The test equipment suitable for FRR of fine­ grained ... (15−0 mm) and fluidized­bed roasting, can only treat coarse ­grained or rich ­in ­coarse ­ ... feasibility of the ore by magnetic separation.