Study on the Effect of Different Factors on the Change of the Phosphorus-Rich Phase in High Phosphorus Steel Slag

Wang, Zhongliang; Bao, Yanping; Wang, Dazhi; Gu, Chao; Wang, Min

doi:10.3390/cryst12081030

Cited by 5 publications

(3 citation statements)

References 33 publications

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“…Several scholars [ 22–27 ] have thoroughly investigated the mineral phase composition of steel slag, identifying three main mineral phases, namely, calcium silicate phase, calcium iron phase, and RO (including FeO, MnO, and MgO). Phosphorus present in the slag existed as calcium phosphate in the calcium silicate phase.…”

Section: Resultsmentioning

confidence: 99%

A Multimode Smelting Strategy for Converter Smelting Based on Novel Molten Iron Classification Methods

Gao,

Bao,

Wang

et al. 2024

steel research int.

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Owing to the complexity of converter reactions and the inevitable fluctuations of raw materials, developing a universal smelting strategy suitable for all converter conditions is challenging. Therefore, this study introduces a multimode smelting strategy based on a novel classification method to categorize molten iron. In this method, the molten iron is classified into four regions based on the comprehensive effects of Si and P contents. Specific smelting strategies are recommended for the molten iron in each region. These strategies include adjustments to slag basicity, charging schemes, and the blowing mode of the lance. These multimode smelting strategies are implemented in actual production. The results indicate satisfactory optimization of production processes, including stable production, cost reduction, and increased efficiency. Consequently, the dephosphorization rate increases by 1.22%, the lime consumption per ton of steel decreases by 2.41 kg t−1, and the average basicity of steel slag decreases by 0.21. This strategy provides preliminary guidance before the initiation of the smelting process to improve efficiency, reduce consumption, and standardize the operations.

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Section: Resultsmentioning

confidence: 99%

A Multimode Smelting Strategy for Converter Smelting Based on Novel Molten Iron Classification Methods

Gao,

Bao,

Wang

et al. 2024

steel research int.

Self Cite

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show abstract

“…The main parameters for evaluating the dephosphorization reaction were the phosphorus balance distribution ratio, the P 2 O 5 activity coefficient, and the phosphorus capacity. Theoretical calculations were carried out based on thermodynamic formulas to analyze the influence of the main components and temperature of dephosphorization slag on the dephosphorization effect and to provide guidance for optimizing the converter dephosphorization process [26]. The contents of slag components in the dephosphorization stage of the converter used for calculation are shown in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Study on Efficient Dephosphorization in Converter Based on Thermodynamic Calculation

et al. 2023

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Given the accelerating depletion of iron ore resources, there is growing concern within the steel industry regarding the availability of high-phosphorus iron ore. However, it is important to note that the utilization of high-phosphorus iron ore may result in elevated phosphorus content and notable fluctuations in molten iron, thereby imposing additional challenges on the dephosphorization process in steelmaking. The most urgent issue in the process of converter steelmaking is how to achieve efficient dephosphorization. In this study, the influence of various factors on the logarithm of the phosphorus balance distribution ratio (lgLp), the logarithm of the P2O5 activity coefficient (lgγP2O5), and the logarithm of the phosphorus capacity (lgCp) were examined through thermodynamic calculations. The impact of each factor on dephosphorization was analyzed, and the optimal conditions for the dephosphorization stage of the converter were determined. Furthermore, the influence of basicity and FetO content on the form of phosphorus in the slag was analyzed using FactSage 7.2 software, and the precipitation rules of the slag phases were explored. The thermodynamic calculation results indicated that increasing the basicity of the dephosphorization slag was beneficial for dephosphorization, but it should be maintained below 3. The best dephosphorization effect was achieved when the FetO content was around 20%. The reaction temperature during the dephosphorization stage should be kept low, as the dephosphorization efficiency decreased sharply with the increasing temperature. In dephosphorization slag, Ca3(PO4)2 usually formed a solid solution with Ca2SiO4, so the form of phosphorus in the slag was mainly determined by the precipitation form and content of Ca2SiO4. The phases in the dephosphorization slag mainly consisted of a phosphorus-rich phase, an iron-rich phase, and a matrix phase. The results of scanning electron microscopy and X-ray diffraction analyses were consistent with the thermodynamic calculation results.

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“…Therefore, how to realize the recycling of converter slag in the furnace has become an important research direction. Bao et al [4] studied the leaching law of phosphorus in different acids from high-phosphorus converter slag using a selective leaching process. Wang et al [5] studied the kinetics of microwave carbothermal dephosphorization of converter slag, indicating that the carbothermal reduction reaction is a second-order reaction, and that the limiting link may be an interfacial chemical reaction.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Carbothermal Dephosphorization of Phosphorus-Containing Converter Slag and Its Resource Utilization

Tong

et al. 2023

Processes

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Phosphorus-containing converter slag is a common waste in the iron and steel industry, and has the characteristics of high generation and low secondary-utilization values; however, the high-phosphorus content in converter slag limits its ability to be recycled during the steelmaking process. In this study, the dephosphorization behavior of converter slag by carbothermal reduction was studied through experiments and thermodynamic calculations. The results showed that the gas product of the converter slag produced by carbothermal reduction was mainly P2, and that part of P2 entered the iron phase to generate iron phosphate compounds. With the increase in Fe content, the amount of P2 also increased, which may provide a suitable new direction for the production of ferrophosphorus. Based on the carbothermal reduction theory, a new “circulating steelmaking process of converter steel slag gasification” was proposed and applied to Chengde Iron and Steel Group Co., Ltd. (Chengde, China). The industrial production practice showed that the process did not affect the dephosphorization effect of the next furnace, and that the average iron, steel, and slagging-material consumption per furnace was reduced by 4.74 kg and 608 kg, respectively. CO2 emissions were reduced by 4.86 kg, thus achieving the goals of energy saving, environmental protection, and efficient dephosphorization.

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Study on the Effect of Different Factors on the Change of the Phosphorus-Rich Phase in High Phosphorus Steel Slag

Cited by 5 publications

References 33 publications

A Multimode Smelting Strategy for Converter Smelting Based on Novel Molten Iron Classification Methods

A Multimode Smelting Strategy for Converter Smelting Based on Novel Molten Iron Classification Methods

Study on Efficient Dephosphorization in Converter Based on Thermodynamic Calculation

Behavior of Carbothermal Dephosphorization of Phosphorus-Containing Converter Slag and Its Resource Utilization

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