CONTINUOUS PROCESS FOR REMOVAL OF WASTEWATER CHROME AND RECOVERED CHROMIUM VALORISATION

摘要

The invention relates to a continuous process for the removal of chromium from the waste water which contains it and to the recovery of recovered chromium. The waste water containing chromium is subjected to treatment by ACETIC ACID OR ALKALI ACETATES AND HOT WATER ALKALI HYDRATES (40C ON BOILING), CONTINUOUS AND AT ATMOSPHERIC PRESSURE, AT A PH GREATER THAN 6.5, PREFERABLY BETWEEN 7 AND 10, IN PARTICULAR ABOUT 7.5. A "SANDY" TYPE OF CHROMIUM HYDRATE OXIDE PRECIPITATE, IN A CROSS OF 20 TO 40 BY WEIGHT, WHICH FILTERS RAPIDLY, IS OBTAINED. / P P THIS PRODUCT IS EASILY SOLUBLE IN ACIDS AND IT PERMITS , THANKS TO THIS, TO BE EMPLOYED EASILY AS TANNING OR IT CAN BE USED AS A RAW MATERIAL TO PREPARE OTHER CHROMIUM COMPOUNDS. / P