Fly ash cenospheres(FACs) coated with nitrogen-doped TiO2(N-TiO2) composites were prepared by the sole gel method for use as photocatalysts.The photocatalytic activity and kinetics of the composites produced at different calcination temperatures and with different nitrogen doping contents were studied under visible light irradiation by monitoring the environmental degradation of methylene blue(MB).The MB degradation ratio of N-TiO2/FAC(25%,450℃) was 10% higher than that of N-TiO2 and 40% higher than that of TiO2/FAC.These N-TiO2/FAC composites floated in water and could be recovered after the photocatalytic reaction by phase separation.
以南京梅山钢铁厂钢渣为研究对象,对一种新型钢渣助磨剂的助磨效果进行了研究。结果表明:钢渣的主要化学成分为CaO、S iO2、A l2O3和MgO等,其中CaO含量高达36.8%。钢渣中只存在无定形类玻璃态物质,无矿物晶体相。助磨剂对粉磨的促进效果主要体现在粉磨前期(30 m in以内)。粉磨20 m in时,加助磨剂的钢渣粉磨样品中小于45μm的颗粒明显多于空白样,45μm筛余量和比表面积(勃氏)分别优化了24%和15%,同时强度活性指数也有所提高。
