Patent Number: 
Section: claims

1. A method for removing the 137Cs from polluted EAF dusts, comprising the steps of:i) providing an amount of EAF dusts polluted with 137Cs;ii) subjecting the dusts to a chemical-physical destabilisation reaction by oxidation or reduction; andiii) after the chemical-physical destabilisation reaction by oxidation or reduction, the release of cesium is obtained. 2. A method according to claim 1, wherein said EAF dusts polluted with 137Cs have an initial average value also >10,000 Bq/kg and wherein the removal of 137Cs has a yield of 98%-100%. 3. A method according to claim 1, wherein the chemical-physical destabilisation takes place in the hydro-metallurgical field by reduction using a reducing agent or an electrochemical reaction or through an oxidation reaction using an oxidizing agent. 4. A method according to claim 3, wherein the reducing agent is Dithionite and the oxidizing agent is KMnO4. 5. A method according to claim 3, wherein the reduction or oxidation reactions take place at a temperature >20° C., preferably at 80-90° C., and at a reaction time between 20 minutes and 1.5 hours, preferably at about 1 hour. 6. A method according to claim 1, wherein the chemical-physical destabilisation takes place in the pyro-metallurgical field through a reduction reaction. 7. A method according to claim 6, wherein the EAF dusts are mixed with coal powder or subjected to direct reduction in H2 or CH4 atmosphere. 8. A method according to claim 1, wherein the destabilisation takes place in the pyro-metallurgical field through an oxidation reaction. 9. A method according to claim 8, wherein the oxidation reaction takes place by using, as an oxidizing agent, pure oxygen or oxygen from the air or oxygen-enriched air. 10. A method according to claim 6, wherein the reaction takes place at a temperature >800° C. 11. A method according to claim 10, wherein the heating is produced by microwaves. 12. A hydro-metallurgical plant for removing 137Cs from polluted EAF dusts, comprising:a reactor for carrying out the reductive or oxidative chemical-physical destabilisation reaction;a separation and recovery system of the 137Cs from the extraction solution of the EAF dusts; anda recovery system of the decontaminated EAF dusts,wherein it carries out the method according to claim 1. 13. A pyro-metallurgical plant for removing 137Cs from polluted EAF dusts, comprising:a furnace for carrying out the reductive or oxidative chemical-physical destabilisation reaction of the EAF dusts polluted with 137Cs;a separation and recovery system of the 137Cs extracted from the EAF dusts, anda recovery system of the decontaminated EAF dustswherein it carries out the method according to claim 1. 14. A plant according to claim 12, wherein said EAF dusts polluted with 137Cs have an initial average value also >10,000 Bq/kg. 15. A method for removing 137Cs from polluted EAF dusts, with an initial average value also >10,000 Bq/kg, in order to obtain a decontamination yield of 98%-100% from the 137Cs initially present in the EAF dusts which comprises contacting EAF dusts in a plant as defined in claim 12 with an oxidizing agent or a reducing agent. 16. A method according to claim 8, wherein the reaction takes place at a temperature >800° C. 17. A method for removing 137Cs from polluted EAF dusts, with an initial average value also >10,000 Bq/kg, in order to obtain a decontamination yield of 98%-100% from the 137Cs initially present in the EAF dusts which comprises contacting EAF dusts in a plant as defined in claim 13 with an oxidizing agent or a reducing agent.