vacuum refined salt
... 真空开关管：vacuum switch 真空精制盐：vacuum refined salt 真空搅土机：de-airing pug mill ...
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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.
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