Promotion of manganese extraction and flue gas desulfurization …
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 …
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Effects of Desulfurization Processes on Polybrominated …
Installing desulfurization operations and closing outdated facilities can effectively decrease pollutant emissions from iron ore sintering plants (IOSPs). Polybrominated dibenzo- p-dioxin and dibenzofuran (PBDD/F) emissions from different-sized IOSPs with different desulfurization operations were an …
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Desulphurisation in 21st century iron- and steelmaking
The two most important HMD processes are the co-injection process (where desulphurising reagents, typically Mg and CaO or CaC2, are injected into the hot metal) and the …
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Desulfurization of Iron Ores: Processes and Challenges
In iron ore desulfurization industry, this process depends on the ability of bubbles to selectively adhere to sulfidic minerals and then remove this mineral (minerals) by …
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An Experimental Study on Enhancing Microbial …
Ultrasonic technology is being increasingly explored in minerals processing. In this paper, ultrasonic treatment was introduced as a novel method for microbial desulfurization of sulfide ores. A …
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Subcritical hydrothermal oxidation of semi-dry ash from iron ore
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 …
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Desulfurization of Iron Ores: Processes and Challenges
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 …
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Desulphurization of Steel : Fundamentals & Practices
Desulphurization using basic slag can be brought about by two mechanism: 1. Reaction takes place between basic synthetic or refining slag (which is added to the empty ladle) …
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Low-temperature oxidation behavior and mechanism of semi …
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 desulfurization ash. The effects of the ammonium citrate concentration, oxidation temperature, solid/liquid ratio, and oxidation time on the wet …
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Desulfurization of Iron Ores: Processes and Challenges
The reagents used in iron ore flotation, including starch, amines and fatty acids, and the mechanisms of their interactions with the minerals in iron ore are examined.
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Minerals | Free Full-Text | The Desulfurization of Magnetite Ore …
The contamination of sulfur emanating from pyrrhotite in magnetite concentrates has been a problem in iron ore processing. This study utilized froth flotation to float pyrrhotite away from magnetite using collectors of xanthate and dixanthogen. It was found that xanthate or dixanthogen alone could not achieve selective separation between pyrrhotite and …
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Establishing a green biodesulfurization process for iron ore
A straightforward alternative to iron ore desulfurization involves. acid leaching, where the reduction of sulfur content is directly. proportional to H. 2. SO. 4. concentration and reaction time ...
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Low-temperature oxidation behavior and mechanism of …
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 …
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Iron Ore Desulfurization Methods & Processes
Iron ore desulfurization is the process of removing sulfur from iron ore that contains sulfur compounds. Sulfur is a common impurity in iron ore, and the presence of sulfur compounds can adversely affect the ironmaking process and product quality.Therefore, desulfurization is an essential link in the iron ore pretreatment process.
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Desulfurization of Iron Ores: Processes and Challenges
Finally, the techniques are compared from technical, economic and environmental viewpoints, and future trends in desulfurization of iron ores are presented. 1. Introduction The strength of steel is detrimental to the sulfur content of iron ore and pig iron (from which steel is made); therefore, excess steel sulfur content influences the ...
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In-process control of manganese dithionate in the manganese ore …
Manganese ore-based wet flue gas desulfurization (MFGD) is a resourcing technology capable of simultaneously reutilization flue gas sulfur dioxide (SO 2) and green, low-carbon manganese leaching.However, the by-product manganese dithionate (MnS 2 O 6) greatly affects the use of desulfurization liquid.In this study, the iron introduced …
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Evaluation of column flotation froth behavior by image …
This study presents an experimental program performed to investigate the effects of flotation variables including gas flow rate, froth depth, slurry solids percent, frother/collector dosage, and pH on the froth features such as bubble size, froth velocity, froth color and froth stability during desulfurization of an iron ore.
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Sulphur removal in ironmaking and oxygen steelmaking
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 (SM) …
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The control of H2S in biogas using iron ores as in situ …
In this study, five kinds of iron ores, limonite, hematite, manganese ore, magnetite and lava rock, were used as the in situ desulfurizers in the anaerobic digestion reactors to investigate their effects on controlling H 2 S in biogas. The results show that the addition of the five iron ores could significantly control the content of H 2 S in biogas, …
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Sulfur dioxide removal: An overview of regenerative flue gas …
Numerous mitigation techniques have been incorporated to capture or remove SO2 with flue gas desulfurization (FGD) being the most common method. Regenerative FGD method is advantageous over other methods due to high desulfurization efficiency, sorbent regenerability, and reduction in waste handling. The …
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Subcritical hydrothermal oxidation of semi-dry ash from iron ore
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 …
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Extraction of Iron from Hematite
Zone 3. Carbon monoxide reduces the iron (III) oxide in the iron ore to form iron. This will melt and collect at the bottom of the furnace, where it is tapped off. iron (III) oxide + carbon monoxide → iron + carbon dioxide. Limestone (calcium carbonate) is added to the furnace to remove impurities in the ore.
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Establishing a green biodesulfurization process for iron ore
We then compared the At. thiooxidans-mediated desulfurization process, with and without air supply, under potassium limitation, varying the initial biomass concentration in 1-m columns. Aerated systems facilitated approximately 70% sulfur removal across the entire column with minimal iron loss.
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Effects of Circulated Flue Gas Components on Iron Ore …
KEY WORDS: iron ore; sintering; flue gas circulation process; desulfurization. 1. Introduction Sulfur dioxide (SO2) is one of the precursors of acid rain and it is very essential to remove it from the exhaust gases.1) Approximately, 7.5% SO2 emissions are attributed to the iron and steel industry in China.2) Iron ore sintering unit is
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Resource utilization of flue gas calcium-based desulfurization …
Among them, calcium desulfurization process is applied on a large scale due to its low cost and becomes the primary desulfurization process, which is widely used in electric power, iron and steel, non-ferrous metals, and other industries [9, 10]. Industrial flue gas desulfurization can effectively reduce sulfur dioxide emissions to atmosphere ...
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Summary of research progress on industrial flue gas desulfurization
D. Zhou et al. used semi dry desulfurization ash from iron ore sintering flue gas as a raw material to prepare calcium sulfate whiskers by removing impurities in gypsum, preparing crystals and optimizing the control [75]. H.X. Li et al. mixed the desulfurization ash produced by semi-dry desulfurization into α-hemihydrate gypsum …
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Desulfurization in roasting iron-ore pellets
Abstract. 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 ...
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Novel technology of reducing SO2 emission in the iron ore …
Iron ore sintering is the main SO2 emission process in iron and steel industry. The flue gas of iron ore sintering has been cleaned by desulfurization equipment, which causes high capital and ...
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DESULFURIZATION OF IRON ORE CONCENTRATE USING …
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 …
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Recycling of desulfurization slag for the production of …
A layer of slag floating on the liquid iron then forms, and sulfur is removed from the liquid iron by a slag-liquid metal reaction described in Eq. (1) [1], [2]. Ca (slag) 2 + + S (iron) 2-→ CaS (slag) Afterwards, the resulting slag, called desulfurization slag (abbreviated to De-S slag), is discharged as a waste and then transported to ...
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