Desulfurization Of Iron Ore

The proper feed for the pelletizing plant must have iron and the Blaine number more than 67 % and 1900 cm 2 g -1 and sulfur content less than 0.1 %, respectively. In this work, the feasibility study of desulfurization process for iron ore used in the pelletizing plant was carried out in the fourth line of the Gol-e-Gohar Complex. Two methods were examined for desulfurization …

Iron ore sintering is an important part of a long steelmaking process with sulfur dioxide emissions accounting for 40%–80% of the total sulfur dioxide emissions in steel companies [1,2,3,4].Semi-dry flue gas desulfurization technology combines the characteristics of wet and dry flue gas desulfurization processes, and it has significant advantages such as low …

Abstract– Quantitative analysis of phosphorus removal was carried out based on its as-beneficiated content, iron extraction rate and input concentration of hydrogen peroxide. A …

To mitigate the presence of CaS and minimize its impact on the desulfurization rate, Zhao et al. controlled the temperature at 1423 K and utilized the following composition: 30.4 wt.% desulfurization gypsum (with CaSO 4 as the primary component), 31.7 wt.% iron ore, 11.1 wt.% blast furnace dust, and 26.8 wt.% graphite. Experimental results ...

Keywords: high voltage electrical pulses, crushing, flotation, desulfurization, iron ore 1. Introduction In the last decades, due to the high consumption of iron ore in metallurgy industries, the demands for iron ore have been increasing (Saravari and Shayanfar, 2021). As the high-quality iron ores decrease

Off-Gas Desulfurization with Sodium Bicarbonate for Iron Ore Sinter Plants: Investigation of the Influence of the Off-Gas Temperature

One option involves roasting the sulfur content in iron ore using an oxidant, usually oxygen, and heat in a thermal decomposition process. In this operation, sulfur removal is …

Wei et al. [17], [18] explored the use of subcritical hydrothermal oxidation to oxidize semi-dry desulfurization ash derived from iron ore sintering flue gas. Under the conditions of an initial pressure of 4 MPa, a reaction temperature of 240 °C, a solid–liquid mass ratio of 1:20, and a reaction time of 90 min, the oxidation rate of CaSO 3 ...

In this work, Mn ore was mixed with the wastewater anode solution of electrolytic Mn (ASEM, instead of water) and utilized as the desulfurizer for simultaneous SO 2 removal from flue gas and Mn extraction. The effects of Fe 2+ and Fe 3+ on Mn leaching and flue gas desulfurization were investigated. For MnO 2 and Mn 2 O 3 (mixed with ASEM), the …

Various studies have been increasingly performed on the reduction of sulfur content of iron ores and concentrates. The presence of sulfur in these materials causes technical problems in steel and alloys and environmental issues in the sintering of iron ore process. The achievement of higher sulfur removal rates has been an important goal since the development of sulfur …

The iron ore desulfurization process of pyrrhotite, pyrite-associated iron ore, includes grinding, desulfurization, magnetic separation-flotation combined desulfurization process, and roasting-magnetic separation-flotation combined …

The deoxidation and the desulfurization limits of liquid iron by calcium are calculated to be 1.6 mass ppm O (at 15 mass ppm Ca) and 3.5 mass ppm S (at 40 mass ppm Ca) under the condition of aCaO ...

The reverse flotation of pyrite particles was used for desulfurization of the iron ore for two reasons. Firstly, the amount of pyrite is significantly less when comparing the magnetite in the iron ore sample. Secondly, Pyrite is more hydrophobic and can be easily floated using xanthate collectors.

Desulfurization using thermal decomposition is a side process in iron ore sintering where the iron ore concentrate turns to roasted pelletized iron ore and this has been considered by many researchers.[55–59] All the reactions associated with pellet desulfurization may be divided into four steps: the dissociation of sulfides; their oxidation ...

It follows that the optimal regrinding fineness is 90% -0.045mm. In the circumstances, the S grade of iron concentrate reaches 0.98% with the TFe recovery of 48.50%. Therefore, the separation process of multi-stage grinding is a promising way for iron recovery and desulfurization of the high-sulfurous iron ore. Fig. 5.

Desulfurization of iron-ore pellets was considered in [1‐7]. On the basis of these results and the thermodynamic analysis of possible reactions, the main chemical reactions of sulfur compounds during the heat treatment of pellets may be established. All the reactions associated with pellet desulfurization may be divided into four groups: the dissociation of …

These observations led us to explore the capacity of Acidithiobacillus thiooxidans to remove pyrrhotite-sulfur impurities from iron concentrates. Employing stirred tank bioreactors operating at...

In this research, an effort is made to separately introduce the various processes, industrial practices, and fundamental research activities to remove sulfur from iron ores, concentrates, or roasted iron ores.

Calcium-based desulfurization ash (CDA) is mainly produced in dry and semi-dry flue gas desulfurization processes. The property of CDA is extremely unstable because its main component, calcium sulfite, makes it difficult to be directly applied to the field of building materials. ... The filling material is made of iron ore overflow tailings as ...

This method involves reacting converter sludge with desulfurization ash at high temperatures, facilitating the concurrent elimination of toxic elements. The solid byproduct is suitable as a sintered ore additive, while the gaseous SO 2 serves as a precursor for sulfuric acid production. Additionally, the metal-rich secondary dust offers a ...

The high amount of sulfur in iron ores causes different problems in the production of iron concentrate, pelletizing (environmentally harmful emission of SO 2), and steel production processes (affects the quality of steel) (Singh et al., 2015).Sulfur causes the brittleness of steel at high temperatures, reducing the weldability of steel and its weight recovery due to the …

There are four stages where sulphur can be removed: in the blast furnace (BF), during hot metal (HM) pretreatment, in the converter and during the secondary metallurgy …

This paper can be cited as: Lanzerstorfer, C. (2017). Off-Gas Desulfurization with Sodium Bicarbonate for Iron Ore Sinter Plants: Investigation of the Influence of the Off-Gas Temperature. MATTER: International Journal of Science and Technology, 3(2), 16-25. This work is licensed under the Creative Commons Attribution-Non Commercial 4.0 ...

The results in optimal conditions indicated that column flotation was considerably efficient for iron ore desulfurization so that a high purity concentrate with the sulfur content of 0.08 % and ...

The low-temperature wet oxidation behavior of semi-dry desulfurization ash from iron ore sintering flue gas in ammonium citrate solution was investigated for efficiently utilizing the low-quality ...

In this research, an effort is made to separately introduce the various processes, industrial practices, and fundamental research activities to remove sulfur from iron ores, …

Microwave heating of iron ore was investigated as an alternative to conventional reduction processes to solve the problem of slow heat transfer. Microwave heating and reduction tests were run on composite green balls made from coal and magnetite concentrate. Bench-scale tests were run on both powdered and pelletized feeds using a 15 kW microwave generator. A …

Direct application of high-sulfur fuels and ores can cause environmental pollution (such as air pollution and acid rain) and, in serious cases, endanger human health and contribute to property damage. In the background of preserving the environment, microbial desulfurization technologies for high-sulfur fuels and ores are rapidly developed. This paper aims to reveal the …

Realization of low temperature and high efficiency oxidation of CaSO 3 is the key to solve the issue of ecological hazards caused by semi-dry sintering flue gas desulfurization ash. The subcritical hydrothermal technology was employed for the oxidation of CaSO 3, achieving 89.83% of CaSO 3 at 180 °C, 2 MPa for 120 min with a solid-to-liquid ratio of 1:20.