Nigeria is rich is solid mineral resources, such as: Kaolin, gypsum, mica, clay, tantalite, iron ore, gemstone, silica sand.
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By absorbing the advanced technology from the world, we researched and designed PF series impact crusher.…
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Base on the plentiful experience of producing and marketing of impact crusher, Sofol R&D institution…
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Adopting technology from the world, PY Series spring cone crusher has an excellent performance in secondary…
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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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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, while inversely related to particle size. This approach can achieve up to 88% sulfur removal using 4M H 2 SO 4, ...
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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 …
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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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Installing desulfurization operations and closing outdated facilities can effectively decrease pollutant emissions from iron ore sintering plants (IOSPs).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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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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iron ores with a high content of impurities, such as sulfur, have been processed [2]. Pyrrhotite (Fe1 xS) is a kind of common sulfide which exists in magnetite ore as an associated mineral with little industrial value. The contamination of sulfur emanating from pyrrhotite in magnetite concentrates has been a problem in iron ore smelting process.
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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 ...
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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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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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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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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.
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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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the desulfurization of iron concentrate [10]. Nakhaei and Irannajad studied the desulfurization of iron ore tailing of the Gol-e-Gohar Complex using gravity and magnetic separation followed by reverse flotation. A final concentrate with the iron content of 63.7 % and sulfur content of 0.08 % was achieved [11].
DetailsThis 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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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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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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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 …
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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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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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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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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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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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1. Introduction. During the coal combustion and utilization, the sulfur, such as pyrite and organic sulfur in coal is a key issue for the environmental protection (Restrepo et al., 2015).The sulfur in coal is removed or controlled by three major methods, i.e. removal of sulfur by coal preparation or cleaning techniques prior to utilization (Eliot, 1978), sulfur …
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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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[Show full abstract] size, froth velocity, froth colour and froth stability) in the column flotation was discussed during desulfurization of an iron ore using response surface methodology.Image ...
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Sulfur is widely found in natural minerals, 1 but is a harmful impurity in the processing of iron ore for the production of steel. Therefore, pre-desulfurization of iron ore before smelting can not only reduce environmental pollution 2,3 but also improve the quality of steel 4 (increase ductility and toughness, reduce cracking in forging and …
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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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Iron ore tailings have become one kind of the most hazardous solid waste. Beneficiation of iron ore tailings is a significant issue in the world steel industries, both from the point of view of ...
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In this study, the optimal HMD slag composition is investigated, considering both the sulphur removal capacity and the iron losses. In part I the theory is discussed and in …
DetailsRealization 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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