精制盐指原盐经净化、加工提炼精制的盐。精制盐技术要求较高，氯化钠含量一级不得少于99.30%，二级不得少于98.50%。按现行《盐税条例 (草案)》规定，未税原盐加工成精制盐后销售，就精制盐缴纳盐税; 用已纳过税的盐加工精制盐，销售后不再缴纳盐税。
干燥是精制盐工业生产中的高耗能环节。
Drying is a high energy-consuming industry in refined salt industrial production.
从制取方法上来讲，多效真空蒸发制盐是生产精制盐及高纯工业盐的重要方法。
In respect of the producing method, refined and high unmixed salt is usually made by multiple effect evaporation in vacuum, when man-made bittern is needed.
大型振动流化床在精制盐干燥过程中存在着漏料问题，直接影响产品质量和生产量。
There is the problem of leaking material in the large vibrating fluidized bed in drying of refined salt. It affects the output and quality of the salt products directly.
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