Studies on clarification of metal forms in molten fly ashes and high-efficiency removal of sulfur compounds

为了开发一种高效回收熔融粉煤灰中有价金属的工艺，研究了CaCO3、cao和Fe对铅和硫的氯化行为及其化学形态的变化。在1073 K条件下，添加CaCO3可使混合样品中硫的去除率达到53.9 ~ 66.1%，抑制了铅的硫化。CaCO3和CaO在固相中形成了金属硫酸盐（M: Na， K, Ca, Fe）。

To develop an efficient recovery process of valuable metals from molten fly ashes,chlorination behavior and chemical form changes of lead and sulfur with CaCO3, CaOand Fe were investigated. In the case of CaCO3 addition, removal extent of sulfur from mixed sample was achieved to 53.9 - 66.1% at 1073 K, and lead sulfurization wassuppressed. Metal sulfate (M : Na, K, Ca, Fe) were formed in solid phase by theaddition of CaCO3 and CaO.