The invention discloses a
recovery system of a mould corrosive wash solution, namely
sodium hydroxide. The
system comprises a storage container, a mould boiling container and a reaction tank. A
blowoff valve is arranged on the bottom of one side of the storage container, the other side of the storage container is connected with a liquid inlet of the mould boiling container through a
pipe line I, an air discharging
pipe is arranged on a top cover of the mould boiling container, the reaction tank is of a hollow structure with an opening in the top, stirring blades are arranged in the reaction tank, a liquid inlet in one side of the reaction tank is connected with a liquid outlet of the mould boiling container through a pipeline II, a conveying pump I is arranged on the pipeline II, an air inlet
pipe is located at the position, above the pipeline II, of the reaction tank, a liquid outlet in the other side of the reaction tank is connected with a liquid inlet in the top of the storage container through a pipeline III, and a conveying pump II is arranged on the pipeline III. According to the
recovery system, the
sodium hydroxide solution containing NaAlO2 is converted into a
sodium hydroxide solution which can be utilized again and dry
sludge obtained through aluminum hydroxide
sedimentation, the system saves more energy and is more
environmentally friendly, and the corrosive wash efficiency of an
extrusion mould is effectively improved.