Impact of slag composition activity on the behavior of phosphorus in the smelting reduction process of high-phosphorus iron ores

Liu, Yiqin; Zhang, Hao; Li, Zengen; Zhang, Aimin; Zhang, Xiaohui; Qing, Shan

doi:10.1016/j.ijhydene.2017.06.119

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…Since alkali metals have a catalytic effect on the gasification reaction of coke, the presence of alkali metals will accelerate the gasification reaction of coke and reduce the strength of the coke, thus affecting the production of molten iron in a blast furnace. Phosphorus is also an important element that is detrimental in steelmaking [27]. However, in the blast furnace ironmaking process, since desulfurization cannot be performed, all phosphorus elements will directly enter the molten iron, which will seriously affect the quality of the molten iron [27].…”

Section: Hazardous Element Analysis Of Fuelmentioning

confidence: 99%

“…Phosphorus is also an important element that is detrimental in steelmaking [27]. However, in the blast furnace ironmaking process, since desulfurization cannot be performed, all phosphorus elements will directly enter the molten iron, which will seriously affect the quality of the molten iron [27]. Therefore, the alkali metal content and phosphorus content in the injection fuel need to be controlled at a low level.…”

Section: Hazardous Element Analysis Of Fuelmentioning

confidence: 99%

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Feasibility Study of Bio-Sludge Hydrochar as Blast Furnace Injectant

et al. 2022

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Hydrothermal treatment can convert paper mill biological (bio-) sludge waste into more energy-dense hydrochar, which can achieve energy savings and fossil CO2 emissions reduction when used for metallurgical applications. This study assesses the basic, combustion and safety performance of bio-sludge hydrochar (BSHC) to evaluate its feasibility of use in blast furnace injection processes. When compared to bituminous and anthracite coals, BSHC has high volatile matter and ash content, and low fixed carbon content, calorific value and ignition point. The Ti and Tf values of BSHC are lower and the combustion time longer compared to coal. The R0.5 value of BSHC is 5.27 × 10−4, indicating a better combustion performance than coal. A mixture of BSHC and anthracite reduces the ignition point and improves the ignition and combustion performance of anthracite: an equal mixture of BSHC and anthracite has a R0.5 of 3.35 × 10−4. The explosiveness of BSHC and bituminous coal is 800 mm, while the explosiveness of anthracite is 0. A mixture of 30% BSHC in anthracite results in a maximum explosiveness value of 10, contributing to safer use of BSHC. Mixing BSHC and anthracite is promising for improving combustion performance in a blast furnace while maintaining safe conditions.

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Section: Hazardous Element Analysis Of Fuelmentioning

confidence: 99%

Section: Hazardous Element Analysis Of Fuelmentioning

confidence: 99%

Feasibility Study of Bio-Sludge Hydrochar as Blast Furnace Injectant

et al. 2022

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“…Secondly, The dephosphorization reaction in the refining process is carried out between slag and metal. Previous studies by other researchers and us [13][14][15][16][17][18][19] have clearly investigated the mechanism of dephosphorization between slag and metal. Firstly, phosphorus in iron is oxidized to (P 2 O 5 ) with the conditions of an oxidizing atmosphere or an oxidizing slag (FeO), as shown in Equation (4).…”

Section: Dephosphorization In the Melting Separation Processmentioning

confidence: 99%

The Preparation of High-Purity Iron (99.987%) Employing a Process of Direct Reduction–Melting Separation–Slag Refining

Sun

et al. 2020

Materials

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In this study, high-purity iron with purity of 99.987 wt.% was prepared employing a process of direct reduction–melting separation–slag refining. The iron ore after pelletizing and roasting was reduced by hydrogen to obtain direct reduced iron (DRI). Carbon and sulfur were removed in this step and other impurities such as silicon, manganese, titanium and aluminum were excluded from metallic iron. Dephosphorization was implemented simultaneously during the melting separation step by making use of the ferrous oxide (FeO) contained in DRI. The problem of deoxidization for pure iron was solved, and the oxygen content of pure iron was reduced to 10 ppm by refining with a high basicity slag. Compared with electrolytic iron, the pure iron prepared by this method has tremendous advantages in cost and scale and has more outstanding quality than technically pure iron, making it possible to produce high-purity iron in a short-flow, large-scale, low-cost and environmentally friendly way.

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“…Tests were carried out using various Na 2 CO 3 -adjusted pulp pH values, toluenesulfonamide dosage As the pH of the pulp increased, the grade of the iron concentrate first increased and then decreased; the phosphorus content exhibited the opposite trend. If the pH is too high during a flotation process, the viscosity of the pulp increases, which prevents adhesion of minerals to the froth and thus affects the separation of phosphorus minerals and magnetite [25,26]. A flotation pulp pH value of 9 was most suitable, achieving the following performance: iron content of 67.11%, phosphorus content of 0.22%, and iron recovery of 90.61%.…”

Section: Effect Of Pulp Phmentioning

confidence: 99%

Increasing Iron and Reducing Phosphorus Grades of Magnetic-Roasted High-Phosphorus Oolitic Iron Ore by Low-Intensity Magnetic Separation–Reverse Flotation

Xiao

Zhou

2019

Processes

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High-phosphorus oolitic iron ore, treated by suspended flash magnetic roasting, contained 42.73% iron (mainly present as magnetite) and 0.93% phosphorus (present as collophane). Low-intensity magnetic separation (LIMS) was combined with reverse flotation to increase the iron and reduce the phosphorus contents of the roasted product. The results showed that an optimized iron ore concentrate with an iron grade of 67.54%, phosphorus content of 0.11%, and iron recovery of 78.99% were obtained under LIMS conditions that employed a grind of 95% −0.038 mm and a magnetic field of 0.10 T. Optimized rougher reverse-flotation conditions used a pulp pH of 9 and dosages of toluenesulfonamide, starch, and pine alcohol oil of 800 g/t, 1000 g/t, and 40 g/t, respectively; optimized scavenging conditions used a pulp pH of 9 and dosages of toluenesulfonamide, starch, and pine alcohol oil of 400 g/t, 500 g/t, and 20 g/t, respectively. Study of the mechanism of phosphorus reduction showed that the toluenesulfonamide could be adsorbed on the surface of quartz after the action of starch, but adsorption was significantly weakened. The starch inhibitor negatively affected adsorption on quartz, but positively influenced adsorption of phosphorus minerals.

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Impact of slag composition activity on the behavior of phosphorus in the smelting reduction process of high-phosphorus iron ores

Cited by 11 publications

References 9 publications

Feasibility Study of Bio-Sludge Hydrochar as Blast Furnace Injectant

Feasibility Study of Bio-Sludge Hydrochar as Blast Furnace Injectant

The Preparation of High-Purity Iron (99.987%) Employing a Process of Direct Reduction–Melting Separation–Slag Refining

Increasing Iron and Reducing Phosphorus Grades of Magnetic-Roasted High-Phosphorus Oolitic Iron Ore by Low-Intensity Magnetic Separation–Reverse Flotation

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