铜转炉烟尘选冶联合处理新工艺研究

采用选冶联合方法处理铜转炉烟尘 ,烟尘经水浸、固液分离后 ,浸出液用湿法操作脱除杂质铁、砷 ,以海绵铜的形式回收有价金属铜 ,以ZnSO·7H2 O的形式回收有价金属锌 ;浸出渣则通过摇床选出铜精矿、次精矿和中矿直接返回转炉     

TiB_2惰性阴极材料的特性与工程化实验研究

针对现代大型金属铝惰性材料的技术发展 ,重点论述二硼化钛惰性阴极材料的特性和作用机理 ,叙述了二硼化钛粉体制备、二硼化钛及其复合材料的涂层技术 ,提出厂混捏—成型可湿性阴极的工业实验方案     

Flux-adjusted phase transformation from Ca2SiO4 to Ca3Si2O7 with Eu2+ activator for white light emitting diodes

Eu2+ -activated reddish-orange-emitting Ca3Si2O7 phosphors were synthesized with the addition of NH4Cl flux.When the phosphors were synthesized in a nominal composition of (Ca0.99Eu0.01)3Si2O7 without flux addition,a Ca3Si2O7 phase responsible for reddish-orange emission was identified to coexist with an intermediate phase of a-Ca2SiO4 for green emission.With the addition of NH4Cl flux,a-Ca2SiO4 was suppressed while the pure phase Ca3Si2O7 was obtained as the flux content was 3 wt%.Through varying the amount of flux,the emission color of samples can be tuned from green to reddish-orange,corresponding to the phase transformation from a-Ca2SiO4 to Ca3Si2O7.Through optimizing the doping concentration of Eu2+ ,the optimized photoluminescence (PL) properties for reddish-orange emission can be achieved,which makes this kind of phosphor prospective in the applications of the phosphor-converted white light emitting diodes (PC-WLEDs).