介绍了垃圾焚烧飞灰的特性以及MVR处理飞灰水洗液技术，概括了可溶性氯盐的分质结晶原理和飞灰水洗液中NaCl和KCl分离过程。NaCl在蒸发器中蒸发浓缩结晶析出，料液的沸点升到近14℃，析出NaCl的母液在氯化钾结晶器中降温至40℃析出KCl晶体。MVR技术在飞灰资源化中的投资回收期为1.5~2.0年。

The characteristics of fly ash from wastes incineration is introduced,and MVR technology for treating with fly ash water washing solution is also described.The principle of fractional crystallization of soluble chloride salts,and the separation process of NaCl and KCl in fly ash washing solution are summarized.NaCl is evaporated,concentrated and crystallized in the evaporator,and then the boiling point of the feed liquid reaches nearly 14℃.The mother liquor after NaCl has been precipitated and removed is cooled to 40℃ in the potassium chloride crystallizer to precipitate KCl crystals.The payback period of MVR technology in fly ash reutilization is 1.5-2 years.