Calcium alumino-titanate(CAT)can be used as a raw material owing to its excellent refractoriness and thermal expansion.CAT-containing taphole clay(THC)with different particle sizes was prepared and characterized.The r...Calcium alumino-titanate(CAT)can be used as a raw material owing to its excellent refractoriness and thermal expansion.CAT-containing taphole clay(THC)with different particle sizes was prepared and characterized.The results indicated that THC with CAT aggregate has better thermo-mechanical performance than that with a fine CAT powder because of different sintering processes.The CAT aggregate and SiO_(2)reacted and formed liquid phase covering their surface,enhancing the bonding of the particle–matrix and promoting the internal transformation of the substance.Further,the mullite was formed in aggregate with the interwoven network structure.Fine CAT powder has a higher specific surface area,and its surface energy decreases with the particle size.This could cause a reaction between CAT and SiO_(2)at relatively low temperature,making it unable to form a core–shell structure similar to that of the aggregate,with the excessive liquid phase affecting the performance of the samples.Meanwhile,the liquid phase was formed to close the pores and cover the SiC surface,and this was found to enhance the oxidation resistance.A corrosion test confirmed that the THC refractories with CAT aggregates showed better corrosion resistance than other samples.Scanning electron microscopy and energy-dispersive spectrometry results indicated that Ti(C,N)transformed by TiO_(2)in CAT was deposited at the interface between the molten slag and the refractory,and it efficiently prevented the penetration and reaction owing to its high melting point and small wetting angle with the slag.展开更多
A new type taphole drill was designed. The vibration properties of them drill-punch mechanism for the new type taphole drill were researched, the laws of its inherent characteristics were found. The measures to add pu...A new type taphole drill was designed. The vibration properties of them drill-punch mechanism for the new type taphole drill were researched, the laws of its inherent characteristics were found. The measures to add punch amplitude and to reduce traverse vibration were put forward. The result showed that decreasing the frequency of vibration motors or increasing the stiffness of springs, and increasing excitation force can improve the vibration properties of the properties of the drill-punch mechanism.展开更多
The compositions, structures and properties of envi- ronmental-friendly ramming materials for mud package and taphole of large-scaled blast furnaces were studied. The results show that the formation of silica fibers m...The compositions, structures and properties of envi- ronmental-friendly ramming materials for mud package and taphole of large-scaled blast furnaces were studied. The results show that the formation of silica fibers makes structure of ramming materials dense. During the process of extruding mud and ramming materials, SiC is partly oxidized ; CaO , F% 03 and carbon penetrate towards the outer wall. The improvement of ramming materials can inhibit the penetration of molten slag, iron and carbon. The bulk density of environmental-friendly ramming ma- terials dried at 200 ℃ is 2.90 g · cm-3, the cold com- pressive strength of this kind of ramming materials dried at 200 ℃ is about 17. 0 MPa and fired at I 450 ℃ is about 39. 2 MPa.展开更多
To satisfy the service conditions of TISCO 4 350 m^3 blast furnace and the requirements to taphole clay, the study on the taphole clay for large blast furnace was carried out. The taphole clay with good workability, o...To satisfy the service conditions of TISCO 4 350 m^3 blast furnace and the requirements to taphole clay, the study on the taphole clay for large blast furnace was carried out. The taphole clay with good workability, opening ability and high-temperature performance was prepared by optimizing raw materials, grain size distribution, binder selection, etc. The trail application in TISCO 4 350 m^3 blast furnace showed that the newlydeveloped taphole clay had a satisfactory performance.展开更多
基金The authors would like to acknowledge the funding support from Shanghai Baowu Equipment Intelligent Technology Co.,Ltd.(No.KYSD001906B).
文摘Calcium alumino-titanate(CAT)can be used as a raw material owing to its excellent refractoriness and thermal expansion.CAT-containing taphole clay(THC)with different particle sizes was prepared and characterized.The results indicated that THC with CAT aggregate has better thermo-mechanical performance than that with a fine CAT powder because of different sintering processes.The CAT aggregate and SiO_(2)reacted and formed liquid phase covering their surface,enhancing the bonding of the particle–matrix and promoting the internal transformation of the substance.Further,the mullite was formed in aggregate with the interwoven network structure.Fine CAT powder has a higher specific surface area,and its surface energy decreases with the particle size.This could cause a reaction between CAT and SiO_(2)at relatively low temperature,making it unable to form a core–shell structure similar to that of the aggregate,with the excessive liquid phase affecting the performance of the samples.Meanwhile,the liquid phase was formed to close the pores and cover the SiC surface,and this was found to enhance the oxidation resistance.A corrosion test confirmed that the THC refractories with CAT aggregates showed better corrosion resistance than other samples.Scanning electron microscopy and energy-dispersive spectrometry results indicated that Ti(C,N)transformed by TiO_(2)in CAT was deposited at the interface between the molten slag and the refractory,and it efficiently prevented the penetration and reaction owing to its high melting point and small wetting angle with the slag.
文摘A new type taphole drill was designed. The vibration properties of them drill-punch mechanism for the new type taphole drill were researched, the laws of its inherent characteristics were found. The measures to add punch amplitude and to reduce traverse vibration were put forward. The result showed that decreasing the frequency of vibration motors or increasing the stiffness of springs, and increasing excitation force can improve the vibration properties of the properties of the drill-punch mechanism.
文摘The compositions, structures and properties of envi- ronmental-friendly ramming materials for mud package and taphole of large-scaled blast furnaces were studied. The results show that the formation of silica fibers makes structure of ramming materials dense. During the process of extruding mud and ramming materials, SiC is partly oxidized ; CaO , F% 03 and carbon penetrate towards the outer wall. The improvement of ramming materials can inhibit the penetration of molten slag, iron and carbon. The bulk density of environmental-friendly ramming ma- terials dried at 200 ℃ is 2.90 g · cm-3, the cold com- pressive strength of this kind of ramming materials dried at 200 ℃ is about 17. 0 MPa and fired at I 450 ℃ is about 39. 2 MPa.
文摘To satisfy the service conditions of TISCO 4 350 m^3 blast furnace and the requirements to taphole clay, the study on the taphole clay for large blast furnace was carried out. The taphole clay with good workability, opening ability and high-temperature performance was prepared by optimizing raw materials, grain size distribution, binder selection, etc. The trail application in TISCO 4 350 m^3 blast furnace showed that the newlydeveloped taphole clay had a satisfactory performance.
