Process for separating silicic compounds from cleaning baths and plant for its application
AssigneeSollac
InventorLothaire W. Scherer
Life of this patent
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Abstract
The subject of the invention is a process for separating silicic compounds from baths for cleaning steel substrates containing iron ions and silicic compounds, consisting of the following stages: a) a concentrated spent cleaning bath is cooled in a controlled manner to a temperature below 60.degree. C. so as to precipitate the silicic compounds, b) the cleaning bath is allowed to cool for at least 2 hours, c) the cleaning bath is reheated, d) the silicic compounds precipitated from the cleaning bath are separated off.
Claims6
Process for separating silicic compounds from baths for cleaning steel substrates containing iron ions and silicic compounds, consisting of the following stages:
- a) a concentrated spent cleaning bath is cooled in a controlled manner, at a rate of between 0.2 and 4.degree. C./min, to a temperature below 60.degree. C. so as to precipitate the silicic compounds,
- b) terminating the controlled cooling of step (a) and allowing crystallization of silicic compounds to proceed in the cleaning bath for at least 2 hours,
- c) the cleaning bath is reheated to obtain a bath viscosity permitting a separation of the silicic compounds,
- d) the silicic compounds precipitated from the cleaning bath are separated off.
Dependencies are inferred from the claim text.