High alumina slag is widely found in pyrometallurgical extractions of ferronickel,ferrochromium,and platinum group metals.The effects of MgO,Al_(2)O_(3),and CaO/SiO_(2) on the sulfur distribution ratio between high-al...High alumina slag is widely found in pyrometallurgical extractions of ferronickel,ferrochromium,and platinum group metals.The effects of MgO,Al_(2)O_(3),and CaO/SiO_(2) on the sulfur distribution ratio between high-alumina CaO–SiO_(2)–MgO–Al_(2)O_(3) slag and carbon-saturated iron were investigated.The slag consisted of Al_(2)O_(3) content in the range of 27.61–40.00 wt.%,CaO/SiO_(2) ratio of 0.8–1.1,and MgO content of 8–16 wt.%.The theoretical liquid areas of CaO–SiO_(2)–MgO–Al_(2)O_(3) slag were analyzed through the phase diagrams.The sulfur distribution ratio was measured via the slag–metal equilibrium technique at 1500ºC.It was observed that the sulfur distribution ratio increased with higher MgO content and higher CaO/SiO_(2) ratio largely due to the increase in free O^(2-)ions and the decrease in activity coefficient of sulfur ion in slag,but slightly decreased with the increasing Al_(2)O_(3) content because of the decrease in free O^(2-).展开更多
The corrosion of refractories results from reactive transport,namely,transport of agents and chemical reactions of these agents with impregnated medium. On one hand,the transport involves either diffusion or impregnat...The corrosion of refractories results from reactive transport,namely,transport of agents and chemical reactions of these agents with impregnated medium. On one hand,the transport involves either diffusion or impregnation depending on the state of the corrosive agents and the microstructure of the host media. On the other hand,chemical reactions may be very numerous and complex.This study focused on the reactive impregnation of Al2O3- CaO slag into porous high alumina refractory. The transport properties of the refractory material were identified by means of a dedicated capillary rising test. Chemical reactions between the solid high alumina skeleton and Al2O3- CaO slag involve successive dissolution / precipitation mechanisms forming aluminates of lime. Contrary to the thermodynamic properties of the binary system,the kinetics of these solid / liquid reactions is not well known.Corrosion tests associated with the quenching method,XRD analyses were performed for a better understanding of the kinetics. The results of this study open up a coupling approach for predicting the corrosion wear of refractory.展开更多
A colloidal silica sol bonded product range is introduced by an example targeting high temperature applications in steel making. Placement and setting characteristics are shown. The thermal mechanical properties and r...A colloidal silica sol bonded product range is introduced by an example targeting high temperature applications in steel making. Placement and setting characteristics are shown. The thermal mechanical properties and resulting advantages are presented as well as the performance enhancement in corrosion resistance. Properties are compared to a common ULCC product. Results of the industrial trial phase are discussed.展开更多
The combination of SiC and andalusite with calcium aluminate binder for castables in high corrosive gasifying environments is a promising alternative refractory system for many different slag systems. After sintering,...The combination of SiC and andalusite with calcium aluminate binder for castables in high corrosive gasifying environments is a promising alternative refractory system for many different slag systems. After sintering,a glassy protective layer has been identified. Beside the interactions of the refractories with intermediate slag also the thermomechanical properties,the thermal shock performance and the microstructure have been evaluated as a function of different binder systems.展开更多
基金The authors gratefully acknowledge the support from the National Natural Science Foundation of China Project(52104345)the Major Science and Technology Special Project of Yunnan Province(202002AB080001-1).
文摘High alumina slag is widely found in pyrometallurgical extractions of ferronickel,ferrochromium,and platinum group metals.The effects of MgO,Al_(2)O_(3),and CaO/SiO_(2) on the sulfur distribution ratio between high-alumina CaO–SiO_(2)–MgO–Al_(2)O_(3) slag and carbon-saturated iron were investigated.The slag consisted of Al_(2)O_(3) content in the range of 27.61–40.00 wt.%,CaO/SiO_(2) ratio of 0.8–1.1,and MgO content of 8–16 wt.%.The theoretical liquid areas of CaO–SiO_(2)–MgO–Al_(2)O_(3) slag were analyzed through the phase diagrams.The sulfur distribution ratio was measured via the slag–metal equilibrium technique at 1500ºC.It was observed that the sulfur distribution ratio increased with higher MgO content and higher CaO/SiO_(2) ratio largely due to the increase in free O^(2-)ions and the decrease in activity coefficient of sulfur ion in slag,but slightly decreased with the increasing Al_(2)O_(3) content because of the decrease in free O^(2-).
基金the Federation for International Refractory Research and Education ( Fire) and to the General Council of Loiret ( CG45) for partial supports of this work
文摘The corrosion of refractories results from reactive transport,namely,transport of agents and chemical reactions of these agents with impregnated medium. On one hand,the transport involves either diffusion or impregnation depending on the state of the corrosive agents and the microstructure of the host media. On the other hand,chemical reactions may be very numerous and complex.This study focused on the reactive impregnation of Al2O3- CaO slag into porous high alumina refractory. The transport properties of the refractory material were identified by means of a dedicated capillary rising test. Chemical reactions between the solid high alumina skeleton and Al2O3- CaO slag involve successive dissolution / precipitation mechanisms forming aluminates of lime. Contrary to the thermodynamic properties of the binary system,the kinetics of these solid / liquid reactions is not well known.Corrosion tests associated with the quenching method,XRD analyses were performed for a better understanding of the kinetics. The results of this study open up a coupling approach for predicting the corrosion wear of refractory.
文摘A colloidal silica sol bonded product range is introduced by an example targeting high temperature applications in steel making. Placement and setting characteristics are shown. The thermal mechanical properties and resulting advantages are presented as well as the performance enhancement in corrosion resistance. Properties are compared to a common ULCC product. Results of the industrial trial phase are discussed.
文摘The combination of SiC and andalusite with calcium aluminate binder for castables in high corrosive gasifying environments is a promising alternative refractory system for many different slag systems. After sintering,a glassy protective layer has been identified. Beside the interactions of the refractories with intermediate slag also the thermomechanical properties,the thermal shock performance and the microstructure have been evaluated as a function of different binder systems.
