Patent ID: 8080110
Filing Date: 2011-12-20
Classification: C23G

Abstract:
1. A method to remove rapidly chloride ions from corroded, iron, archeological artifacts comprising the steps of: identifying the artifact from which chloride ions are to be removed; recovering said artifact; pre-treating said recovered artifact by washing to remove debris and any concretion, and positioning said artifact in a container for treatment; preparing a dilute alkaline solution; filling said container with an adequate volume of said dilute alkaline solution; raising a pressure within said container having said dilute alkaline solution to a predetermined phase; maintaining said desired pressure level while heating said dilute alkaline solution to a temperature of between 100° C. and 374° C., thereby providing subcritical conditions to said dilute alkaline solution; circulating said alkaline solution in said container to ensure maximum contact with said artifact for a period of time adequate to remove the chloride ions; and, cooling and discharging said alkaline solution and recovering said artifact from said container.