Recovery system of mould corrosive wash solution, namely sodium hydroxide

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of extrusion die etching and cleaning, and in particular relates to a recovery system for sodium hydroxide, a mold etching and cleaning solution. Background technique [0002] In the modern large-scale production of extrusion plants, molds are of great significance to the realization of the entire extrusion process. In order to improve the life of the mold, various countries have carried out extensive research on the use and maintenance of the mold. The traditional extrusion die etching method is to immerse the die in a sodium hydroxide solution, and use the sodium hydroxide solution to dissolve the aluminum metal, making the die clean and easy to use again. However, the dissolved aluminum will be quickly enriched in the sodium hydroxide solution, so when it continues to dissolve more aluminum, its dissolving ability will quickly decrease until it is completely lost. Therefore, this etching method must be f...

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Problems solved by technology

However, the dissolved aluminum will be quickly enriched in the sodium hydroxide solution, so when it continues to dissolve more aluminum, its dissolving ability will quickly decrease until it is completely lost. Therefore, this etching method must be frequently replaced and discharged. The sodium hydroxide solution used has caused great pollution to the environment

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