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Multi-model coupling-based dynamic control system of ladle slag in argon blowing refining process

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Journal of Iron and Steel Research International 2023年第5期30卷 926-936页

作者： Guang-da Bao Ting Wu Duo-gang wang Xiao-bin Zhou hai-chuan wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243032AnhuiChina Shanghai Meishan Iron and Steel Co. Ltd.Nanjing 210039JiangsuChina

Since the current slagging of argon blowing refining process is relatively fixed,which cannot adapt to the fluctuation of converter smelting process,it poses the problems of poor metallurgical property of refining slag and a large amount of molten *** optimization system coupled with multiple models was proposed to dynamic control the ladle slagging in the argon blowing refining *** can compile the optimal dynamic slagging scheme in real time under the guarantee of deoxidation performance and reasonable *** argon blowing refining slag composition range of CaO/Al_(2)O_(3)=1.3-1.7,CaO/SiO_(2)=6-12,w(MgO)=2%-6% was determined based on FeO activity and liquidus temperature by equilibrium thermodynamic *** addition,it demonstrated better performance in the viscosity prediction task of the presented Visual Geometry Group 16-like one-dimensional convolutional neural network deep learning algorithm versus the Random Forest ensemble learning algorithm,as the adjusted coefficients of determination were 0.9712 and 0.9637,*** the system was applied in operation,the argon blowing refining process was stable,and the steel yield was enhanced,which promoted the intelligent steelmaking level while achieving the cost reduction and efficiency improvement.

关键词： Argon blowing refining process Deoxidation Viscosity model Deep learning Intelligent steelmaking

Simulation research on oxygen mass transfer between steel and slag in IF steel refining process

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Journal of Iron and Steel Research International 2020年第4期27卷 409-419页

作者： Ai-jun Deng Ding-dong Fan hai-chuan wang Can-hua Li School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina Key Laboratory of Metallurgical Emission Reduction&Resource Recycling(Ministry of Education) Ma’anshan 243002AnhuiChina

The effects of oxidizing slag on oxygen mass transfer and inclusions in different stages of IF(interstitial-free)steel refining were investigated by several heat simulation *** results of the experiments showed that the oxidizability of slag changed considerably during different refining *** the content of FeO in the slag within 1 wt.%would narrow the difference of slag oxidizability,stabilize the content of[Al]s in the steel,avoid secondary oxidation of molten steel by the slag,and reduce the *** the mass transfer of FeO in the slag phase was a limiting step,the secondary oxidation reaction occurred at the steel–slag interface;when the diffusion of oxygen in the molten steel was a limiting step,the secondary oxidation reaction took place inside the molten *** oxygen transfer rate was affected by the mass transfer coefficient of *** every 0.0001m/s increase in mass transfer coefficient,the oxygen transfer rate increased by about 2.2×10^-6 min^-*** changing the mass transfer coefficient,the oxygen transfer rate of the slag to the molten steel can be controlled.

关键词： IF steel Slag Steel–slag interface Inclusion Oxygen mass transfer Mass transfer coefficient

Desulfurization of rejected electrolytic manganese metal by electroslag remelting furnace with a water-cooled electrode

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Journal of Iron and Steel Research International 2023年第7期30卷 1411-1425页

作者： Ru Lu Ran-ran Yu Guang-qiang Li Yu Liu Qiang wang hai-chuan wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and TechnologyWuhan 430081HubeiChina

Remelting rejected electrolytic manganese metal (EMM) scrap was investigated by electroslag remelting (ESR) process through industrial experiment. The results indicated that the ANF-6 slag (70 wt.% CaF_(2) + 30 wt.% Al_(2)O_(3)) and deoxidizer could promote the desulfurization of ESR manganese in an air atmosphere. Under an air atmosphere, the sulfur in the ingot decreased to 0.0534 wt.% with a desulfurization ratio of ESR manganese of 53.2% by using ANF-6 slag and water-cooled copper electrode electroslag remelting rejected EMM scrap, suggesting its efficient removal. The electroslag ingots exhibited uneven chemical composition in an air atmosphere and cooling condition of the ESR process. The metal manganese could be oxidized by electroslag remelting of rejected EMM scrap in an air atmosphere with MnO content in the final slag of 21.9 wt.%. Besides, the activity of MnO in slag increased with increasing remelting temperature, resulting in a reduction in the slag–manganese sulfur partition ratio and desulfurization ratio. Moreover, with the accumulation of sulfur in slag and the oxidation of metallic manganese liquid, the slag showed a lower cleanliness and more oxidation, leading to an increase in sulfur and oxygen content in the electroslag ingot with the increase in ingot height.

关键词： Rejected electrolytic manganese metal scrap Desulfurization Electroslag remelting Thermodynamics

Effect of BaO and MgO on structure and properties of aluminate slag with various CaO/Al_(2)0_(3)ratios

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Journal of Iron and Steel Research International 2024年第1期31卷 204-214页

作者： Yu-qi Kong Ting Wu Wen-zhi Xia Wen Yang hai-chuan wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resource Recycling(Ministry of Education) Anhui University of TechnologyMa’anshan243002AnhuiChina

To provide theoretical guidance for performance stability control of low-reactive mold fluxes,the effects of BaO and MgO on the structure and properties of aluminate slag with various CaO/Al_(2)0_(3)(C/A)ratios were investigated using the Fourier transform infrared spectrometer,Raman spectroscope,hemispherical melting point instrument,rotational viscometer and X-ray *** results indicated that with BaO and MgO addition,the structure polymerization was first weakened and then enhanced at C/A of 1.1,and the transition contents corresponded to 8 wt.%BaO and 2 wt.%MgO,respectively,while the structure polymerization decreased continuously at C/A of *** the viscosity change was well consistent with the structure evolution,the polymerization degree played a more prominent role in the slag viscosity than superheat degree when the melting temperature difference was within 40℃.The break temperature decreased initially and then increased with augment of BaO and MgO at C/A of 1.1,while it manifested a decrease trend with BaO addition,and it decreased obviously but then turned to increase with MgO increment at C/A of *** crystallization phase and crystallization ratio kept stable with BaO increment,while the crystallization ratio rose greatly with MgO promoting LiAlO_(2)precipitation at C/A of *** crystal types of all experimental slags were mainly Ca_(12)Al_(14)O_(33)and CaF_(2)at C/A of 1.3,and the precipitation of crystalline phase BaAl2O4 demonstrated a rising trend,while that of Ca_(12)Al_(14)O_(33)gradually declined with BaO augment.

关键词： Aluminate slag Structure MgO BaO Viscosity Property

Distribution of P2O5 between solid solution and liquid phase in dephosphorization slag of CaO-SiO2-FeO-P2O5-Na2O system

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Journal of Iron and Steel Research International 2019年第11期26卷 1162-1170页

作者： chuan-ming Du Ning-ning Lv Chang Su Wei-ming Liu Jin-xing Yang hai-chuan wang Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendaiMiyagi 980-8577Japan School of Metallurgical Engineering Anhui University of TechnologyMa'anshan 243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resources Recycling(Anhui University of Technology) Ministry of Education.Ma'anshan 243002Anhui.China

A multi-phase slag containing Na2O is potential to efficiently dephosphorize high-P hot *** dephosphorization,the generated slag with high P2O5 content is regarded as a P *** P2O5 was mainly concentrated in the 2CaO SiO2-3CaO P2O5 solid solution,the recovery of P from dephosphorization slag primarily depends on the separation of the solid solution from other *** distribution ratios of P2O5 between solid solution and liquid phase in the CaOSiO2-FeO-P2O5-Nslag system were *** results indicated that the addition of Na2O facilitated the enrichment of P2O5 in the solid solution because it increased not only the distribution ratio of P2O5 but also the mass fraction of the solid *** distribution ratio of P2O5 was independent of the P2O5 content in slag.A higher P2O5 content in slag resulted in higher P2O5 and Na2O contents in the solid *** distribution ratio of P2O5 increased with the total Fe content in the liquid phase,regardless of the valence of *** increase in the FeO content in slag brought a higher P2O5 content in the solid *** slag basicity increased,the distribution ratio of P2O5 increased,but the P2O5 content in the solid solution decreased.

关键词： Dephosphorization Steelmaking slag Distribution ratio P2O5 2CaO·SiO2-3CaO·P2O5 solid solution

Leaching process of phosphorus and iron from steelmaking slag into malic acid solution

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Journal of Iron and Steel Research International 2022年第6期29卷 951-960页

作者： Ning-ning Lv Chang Su Hui Kong hai-chuan wang Yuan-chi Dong Key Laboratory of Metallurgical Emission Reduction and Resources Recycling Ministry of EducationAnhui University of TechnologyMa’anshan 243002AnhuiChina School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina

In order to remove phosphorus element from steelmaking slag and decrease iron loss,malic acid was selected as the leaching agent to dissolve steelmaking ***,the influences of different factors,such as malic acid concentration,slag particle size,temperature,liquid/solid ratio and stirring speed,on the leaching ratios of phosphorus and iron were ***,the kinetics for the leaching process of phosphorus was *** results showed that the leaching ratios of phosphorus and iron increase significantly with increasing the malic acid solution concentration and liquid/solid *** the concentration of malic acid solution increases up to 0.01492 mol/L,about 80%phosphorus can be dissolved,and iron leaching ratio is less than 17%.In addition,decreasing slag particle size can obviously increase the leaching ratio of ***,temperature and stirring speed have no significant effect on the dissolution of phosphorus and *** leaching kinetics of phosphorus follows the unreacted shrinking core *** through product layer is the rate-limiting step of the leaching process,and the corresponding apparent activation energy is determined to be 3.32 kJ/***,a semi-empirical kinetic equation was established.

关键词： Leaching process Steelmaking slag Phosphorus Iron Malic acid solution

A distributed Grid-Xinanjiang model with integration of subgrid variability of soil storage capacity

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Water Science and Engineering 2016年第2期9卷 97-105页

作者： Wei-jian Guo chuan-hai wang Teng-fei Ma Xian-min Zeng hai Yang PowerChina Huadong Engineering Corporation Limited Hangzhou 311122 China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China College of Hydrology and Water Resources Hohai University Nanjing 210098 China

Realistic hydrological response is sensitive to the spatial variability of landscape properties. For a grid-based distributed rainfall-runoff model with a hypothesis of a uniform grid, the high-frequency information within a grid cell will be gradually lost as the resolution of the digital elevation model(DEM) grows coarser. Therefore, the performance of a hydrological model is usually scale-dependent. This study used the GridXinanjiang(GXAJ) model as an example to investigate the effects of subgrid variability on hydrological response at different scales. With the aim of producing a more reasonable hydrological response and spatial description of the landscape properties, a new distributed rainfall-runoff model integrating the subgrid variability(the GXAJSV model) was developed. In this model, the topographic index is used as an auxiliary variable correlated with the soil storage capacity. The incomplete beta distribution is suggested for simulating the probability distribution of the soil storage capacity within the raster grid. The Yaogu Basin in China was selected for model calibration and validation at different spatial *** demonstrated that the proposed model can effectively eliminate the scale dependence of the GXAJ model and produce a more reasonable hydrological response.

关键词： Scale effect Subgrid variability Soil storage capacity Incomplete beta distribution GXAJSV model

Water level updating model for flow calculation of river networks

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Water Science and Engineering 2014年第1期7卷 60-69页

作者： Xiao-ling WU Xiao-hua XIANG Li LI chuan-hai wang College of Hydrology and Water Resources Hohai University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Zhenjiang Engineering Survey and Design Institute Co. Ltd.

Complex water movement and insufficient observation stations are the unfavorable factors in improving the accuracy of flow calculation of river networks. A water level updating model for river networks was set up based on a three-step method at key nodes, and model correction values were collected from gauge stations. To improve the accuracy of water level and discharge forecasts for the entire network, the discrete coefficients of the Saint-Venant equations for river sections were regarded as the media carrying the correction values from observation locations to other cross-sections of the river network system. To examine the applicability, the updating model was applied to flow calculation of an ideal river network and the Chengtong section of the Yangtze River. Comparison of the forecast results with the observed data demonstrates that this updating model can improve the forecast accuracy in both ideal and real river networks.

关键词： plain river network cyclic looped channel network water level updating model hydrodynamic model, error correction

Effects of pressure and plastic addition on sticking of fine iron ore particles in fluidized bed reduction

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Journal of Iron and Steel Research International 2021年第2期28卷 140-151页

作者： Qi-yan Xu Zhang-han Gu Zhi-ping Li Ying-yi Zhang hai-chuan wang School of Metallurgical Engineering Anhui University of TechnologyMa’anshan 243002AnhuiChina

The adhesion of fine iron ore particles during fluidized bed reduction was studied using pressurized visible fluidized bed laboratory *** results showed that the optimal operating parameters for pure hydrogen reduction under high pressure were reduction temperature of 1073 K,particle size of 0.18-0.66 mm,pure H_(2) linear velocity of 0.8 m/s,reduction pressure of 200 kPa,and reduction time of 50 *** plastic particles were mixed into the fluidized bed,the optimal parameters were reduction temperature of 973 K,particle size of 0.18-0.66 mm,pure H_(2) linear velocity of 0.8 m/s,reduction pressure of 100 kPa,mass content of plastic particles of 8%,and reduction time of 65 *** chemical reaction resistance is much higher than the inner diffusion resistance at the initial stage of the reaction,whereas,in later stage,the inner diffusion resistance exceeds the chemical reaction *** contact area of iron atoms or iron whiskers gradually decreases with the increase in reduction pressure from 0.20 to 0.45 MPa,and the sticking trend gradually *** plastic particles in the fluidized reduction process of fine iron ore can effectively inhibit the adhesion among fine iron ore particles.

关键词： Fine iron ore Fluidized bed Reduction pressure Plastic particle Sticking Reduction