— 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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— 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 ...
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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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— The impurity sulfur in lead–zinc-bearing hematite–limonite ore mainly exists in the form of galena, sphalerite, pyrite, and natural sulfur, and deep reduction roasting–low intensity magnetic separation does not effectively remove sulfur in a low valence state, which affects the quality of iron ore concentrate. Thereby, the desulfurization mechanism …
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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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— These results demonstrate that sulfide concentration was achieved. In the NSG tail, the average copper, iron, arsenic, and sulfur species grades were lower than 0.08 %. The NSG grades in copper concentrate, SG, and NSG were 6.3 %, 51.8 %, and 99.8 %, respectively, demonstrating that the desulfurization of polymetallic ore was achieved. 3.2.2.
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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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The author tried to combine the additives of pig iron and steel together for the simultaneous desulfurization and dephosphorization of the ductile iron without any oxygen lancing which was successful to certain limit. Objectives The project focused on: i. The study of process for reduction of phosphorus percentage. ii.
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— In this study, a novel method for simultaneously improving desulfurization of iron ore and lowering SO 2 emission in flue gas at low temperature by microwave …
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— A typical of the high sulfur iron ore from Inner Mongolia, China, iron grade of 53.06% and sulfur content is 2.76%, the main metal mineral in the ore is magnetite, followed by magnetic pyrite ...
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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 capital costs of …
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— The most popular method of desulfurization is removal of sulfur from molten steel to the basic reducing slag. Basic slag is a slag containing mainly basic oxides: CaO, MgO, MnO, FeO. A typical basic slag consists of 35-60% CaO + MgO, 10-25% FeO, 15-30% SiO 2, 5-20% MnO. Transition of sulfur from steel to slag may be presented by the …
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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 being transported to the surface, while iron oxide remain in the liquid phase. In the hydrometallurgical route, the sulfidic minerals of the iron ore need to be leached by ...
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— Pig iron must therefore be desulphurised and decarburised! Desulfurization. The refining of pig iron into steel is carried out in liquid form. For this purpose, the pig iron produced in the ironworks is first collected …
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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 ...
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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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— 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 …
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— The sulfidation behaviors of iron-based sorbent with MgO and MgO-TiO2 are studied under different isothermal conditions from 623 to 873 K in a fixed bed reactor. The results of sorbents sulfidation experiments indicate that the sorbents with MgO and TiO2 additives are more attractive than those without additives for desulfurization of hot coal …
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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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— The iron ore sintering process is the main source of SO2 emissions in the iron and steel industry. In our previous research, we proposed a novel technology for reducing SO2 emissions in the flue gas in the iron ore sintering process by adding urea at a given distance from the sintering grate bar. In this paper, a pilot-scale experiment was carried …
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— This fly ash-based zeolite (Gismondine) was active for desulfurization of a model feed of TH (500 ppm S) and BT (500 ppm S) with 43% and 63.5% sulfur removal efficiency [125]. Dolochar is a waste by-product of the sponge iron industry. It is a black coal-like crystalline material containing SiO 2, Al 2 O 3, Fe 2 O 3, CaO, MgO, and fixed …
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— The iron ore sintering process is the main source of SO2 emissions in the iron and steel industry. In our previous research, we proposed a novel technology for reducing SO2 emissions in the flue gas in the iron ore sintering process by adding urea at a given distance from the sintering grate bar. In this paper, a pilot-scale experiment was carried …
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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].
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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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— 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 ...
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— 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 MFGD …
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— Compared with iron ore with higher sulfur content, better desulfurization efficiency is obtained by oxidizing roasting. In addition, yellow condensed sulfur is also found at the tail flue gas outlet, which indicates that the sulfur in the FeS 2 is released in the form of elemental sulfur (S x ) in the N 2 atmosphere.
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— 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 directly related to …
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Iron ore purchases represent up to 2/3 of total operating cost; therefore, iron ore evaluation and selection are extremely important to the operational and financial health and longevity of a direct reduction plant. Reduction characteristics, such as reducibility, agglomeration tendency, and degradation during reduction should be included in a ...
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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) treatment. For sulphur removal a …
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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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