燃料添加剂对柴油机烟粒燃烧的影响

考察了燃料添加剂对降低柴油机烟粒燃点温度的效应。含金属添加剂的柴油机烟粒被收集在金属纤维过滤器上,把原状烟粒样品移入实验室反应器,用模拟柴油机排气进行燃烧试验。实验结果表明,当烟粒中含有Pd或Cu时,烟粒的燃点温度可降至430℃左右(普通柴油机烟粒的燃点温度约600℃);Pd的添加还可大大降低烟粒一次燃烧产物中CO的分率。文中还对金属(催化剂)/烟粒接触程度和添加剂溶液中可燃性部分对烟粒燃烧的影响作了讨论。

从铜精炼厂阳极泥中回收硒和碲

铜阳极泥中存在着大量的硒和碲,回收这些元素不仅合乎需要而且经济可行。为此研制了各种工艺。其中一些工艺由于能回收更多的有价元素且对环境无害,因而更加适用。

α-SiAlON陶瓷中晶界成分的定量分析

The α-sialon ceramic is known for absorbing the sintering aids into the lattice to avoid or reduce the intergranular phases.However,this is less effective with light rare-earth elements(RE)than with heavier REt[1,2].In order to understand how such difference is created,we studied and quantified the distribution of dopants in the microstructures of Nd-and Yb-α-sialon samples with selected dopant compositions by analytical electron microscopy(AEM).……