PROCESS FOR RECOVERING CAUSTIC SODA SOLUTIONS FROM PICKLING OF ALUMINIUM EXTRUSION DIES

摘要

In order to remove aluminum from the reflux liquors from the pickling process of extrusion dies and to regenerate the NaOH solution for re-employing the same in subsequent pickling processes, the process of synthesizing of zeolites is exploited, by previously adding a suitable source of silicon, said process of synthesis allowing the sodium hydroxide solution to be recovered and a more easily disposable mud not harmful for the environment to be obtained, which mud, if found to be of industrial interest, can be recovered and re-employed.