Physical and chemical properties of electric arc furnace(EAF) dust from Tianjin seamless Pipe Company were measured and analyzed.The zinc leaching tests in alkaline medium were carried out under variation of leaching ...Physical and chemical properties of electric arc furnace(EAF) dust from Tianjin seamless Pipe Company were measured and analyzed.The zinc leaching tests in alkaline medium were carried out under variation of leaching agent concentration,leaching temperature,leaching cumulative time and solid-to-liquid ratio.The thermodynamics and kinetics of the zinc leaching process were also analyzed.The results show that the EAF dust contains 10%(mass fraction) zinc and the median particle size is 0.69μm.The zinc recovery of 73.4%is obtained under the condition of 90℃,6 mol/L NaOH,and 60 min leaching time.With the increase of concentration of NaOH and the cumulative time,zinc leaching will be significantly increased.The kinetics study demonstrates that the leaching reaction is chemically controlled and the reaction activation energy is 15.73 kJ/mol.展开更多
The AC electric arc furnace(EAF)is becoming a core apparatus of the modern steel industry.Nevertheless,it used to be a major threat of power quality in the traditional power supply system.In this paper,a flexible powe...The AC electric arc furnace(EAF)is becoming a core apparatus of the modern steel industry.Nevertheless,it used to be a major threat of power quality in the traditional power supply system.In this paper,a flexible power supply system of the AC EAF is proposed,which is expected to completely alter its inherent cognition of impact load in the power grid.The basics of the power supply for EAF are first reviewed and the novel techniques to enhance the operation flexibility of EAF are introduced.The power circuit and the control structure are then presented,followed by the detailed strategies of various operations fully considering the features of EAF.A large disturbance stability criterion based on the mixed potential theory is also established for the practical application.Both electromagnetic transient simulations using PSCAD and benefit analyses verify the feasibility of the proposed system.展开更多
基金Project(20876014) supported by the National Natural Science Foundation of China
文摘Physical and chemical properties of electric arc furnace(EAF) dust from Tianjin seamless Pipe Company were measured and analyzed.The zinc leaching tests in alkaline medium were carried out under variation of leaching agent concentration,leaching temperature,leaching cumulative time and solid-to-liquid ratio.The thermodynamics and kinetics of the zinc leaching process were also analyzed.The results show that the EAF dust contains 10%(mass fraction) zinc and the median particle size is 0.69μm.The zinc recovery of 73.4%is obtained under the condition of 90℃,6 mol/L NaOH,and 60 min leaching time.With the increase of concentration of NaOH and the cumulative time,zinc leaching will be significantly increased.The kinetics study demonstrates that the leaching reaction is chemically controlled and the reaction activation energy is 15.73 kJ/mol.
基金supported in part by the National Natural Science Foundation of China (No.U1866601)。
文摘The AC electric arc furnace(EAF)is becoming a core apparatus of the modern steel industry.Nevertheless,it used to be a major threat of power quality in the traditional power supply system.In this paper,a flexible power supply system of the AC EAF is proposed,which is expected to completely alter its inherent cognition of impact load in the power grid.The basics of the power supply for EAF are first reviewed and the novel techniques to enhance the operation flexibility of EAF are introduced.The power circuit and the control structure are then presented,followed by the detailed strategies of various operations fully considering the features of EAF.A large disturbance stability criterion based on the mixed potential theory is also established for the practical application.Both electromagnetic transient simulations using PSCAD and benefit analyses verify the feasibility of the proposed system.
