Ti-pillared bentonite has been successfully prepared using a modified method that can induce the transformation of TiO2 pillar from amorphous to anatase phase at a low temperature （150℃）. The value of d0.01 =1.94 n...Ti-pillared bentonite has been successfully prepared using a modified method that can induce the transformation of TiO2 pillar from amorphous to anatase phase at a low temperature （150℃）. The value of d0.01 =1.94 nm obtained by Ti-pillared bentonite is larger than that of corresponding raw clay （1.56 nm）. Due to large numbers of Ti-pillars formed, the Ti-pillared bentonite shows an excellent ability in adsorbing Rhodamine B （RB）. The photocatalytic activity and kinetic equation are investigated by decomposing RB solution under the UV irradiation. It is found that the Ti- pillared bentonite shows super photocatalytic activity for the degradation of RB solution compared with the untreated bentonite and pure TiO2, and the kinetic equation of the degradation of RB solution is a 1.5-oder equation.展开更多
以淀粉、膨润土、聚乙烯醇(PVA)为原料制备成复合粘结剂,采用冷压型煤制备技术制成标准型煤。以其冷压强度和跌落强度为技术指标,通过单因素实验得到粘结剂各组分的最佳添加量。结果表明当淀粉添加量为11.50%,膨润土/淀粉为0.25,PVA/(...以淀粉、膨润土、聚乙烯醇(PVA)为原料制备成复合粘结剂,采用冷压型煤制备技术制成标准型煤。以其冷压强度和跌落强度为技术指标,通过单因素实验得到粘结剂各组分的最佳添加量。结果表明当淀粉添加量为11.50%,膨润土/淀粉为0.25,PVA/(膨润土+淀粉)为0.09时,型煤的跌落强度为95.212%,冷压强度为3.760 k N·个^(-1),用响应曲面设计安排实验并对粘结剂组分进行优化,在优化条件下试验检测型煤的跌落强度为95.268%,冷压强度为3.727 k N·个^(-1),与理论值无显著差异,表明模拟值可以反映参数间的真实关系。再通过检测型煤的表面官能团、表面形貌进行分析得出粘结剂对褐煤成型的影响。展开更多
This paper describes the development of an inorganic alternative to coal or coal replacement for bentonite bonded molds (greensand molding) and the realization in an operating foundry. Through a time period of 1.5 yea...This paper describes the development of an inorganic alternative to coal or coal replacement for bentonite bonded molds (greensand molding) and the realization in an operating foundry. Through a time period of 1.5 years, Componenta Foundry changed in many steps from a classical green sand system to a coal free system, based on ENVIBOND developed in the GO-APIC project and further development as an S&B project. At Componenta Foundry, the percentage of casting defects or scrap did not increase. There was a tendency of an increase in stress (scabbing) defects and of a decrease in penetration defects. Benzene emission is reduced by 40%, odor emission has lower values (not statistically proven). Visible is less smoke in the foundry, especially at the cooling line. The benefits for health and emissions are clearly seen.展开更多
基金the National Natural Science Foundation of China （Nos. 40202007, 40573064） the Natural Science Foundation of Guangdong Province （No. 04020017） is gratefully acknowledged.
文摘Ti-pillared bentonite has been successfully prepared using a modified method that can induce the transformation of TiO2 pillar from amorphous to anatase phase at a low temperature （150℃）. The value of d0.01 =1.94 nm obtained by Ti-pillared bentonite is larger than that of corresponding raw clay （1.56 nm）. Due to large numbers of Ti-pillars formed, the Ti-pillared bentonite shows an excellent ability in adsorbing Rhodamine B （RB）. The photocatalytic activity and kinetic equation are investigated by decomposing RB solution under the UV irradiation. It is found that the Ti- pillared bentonite shows super photocatalytic activity for the degradation of RB solution compared with the untreated bentonite and pure TiO2, and the kinetic equation of the degradation of RB solution is a 1.5-oder equation.
文摘以淀粉、膨润土、聚乙烯醇(PVA)为原料制备成复合粘结剂,采用冷压型煤制备技术制成标准型煤。以其冷压强度和跌落强度为技术指标,通过单因素实验得到粘结剂各组分的最佳添加量。结果表明当淀粉添加量为11.50%,膨润土/淀粉为0.25,PVA/(膨润土+淀粉)为0.09时,型煤的跌落强度为95.212%,冷压强度为3.760 k N·个^(-1),用响应曲面设计安排实验并对粘结剂组分进行优化,在优化条件下试验检测型煤的跌落强度为95.268%,冷压强度为3.727 k N·个^(-1),与理论值无显著差异,表明模拟值可以反映参数间的真实关系。再通过检测型煤的表面官能团、表面形貌进行分析得出粘结剂对褐煤成型的影响。
文摘This paper describes the development of an inorganic alternative to coal or coal replacement for bentonite bonded molds (greensand molding) and the realization in an operating foundry. Through a time period of 1.5 years, Componenta Foundry changed in many steps from a classical green sand system to a coal free system, based on ENVIBOND developed in the GO-APIC project and further development as an S&B project. At Componenta Foundry, the percentage of casting defects or scrap did not increase. There was a tendency of an increase in stress (scabbing) defects and of a decrease in penetration defects. Benzene emission is reduced by 40%, odor emission has lower values (not statistically proven). Visible is less smoke in the foundry, especially at the cooling line. The benefits for health and emissions are clearly seen.
