Patent Number: 
Section: claims

1. A method for treating a radioactive liquid effluent of medium activity, wherein calcination of said effluent, to which is optionally added a calcination adjuvant, is carried out in order to obtain a calcinate, and a vitrification adjuvant for producing an alumino-borosilicate glass is then added to said calcinate, the vitrification adjuvant having the following composition expressed in percentages by mass:SiO2: 58 to 65B2O3: 15 to 19Na2O: 5 to 10Al2O3: 0 to 3Li2O: 1 to 4CaO: 1.5 to 4ZrO2: 0 to 3Fe2O3: 2 to 4NiO: 0 to 2CoO: 0 to 2,it is proceeded with the melting of said calcinate and of said vitrification adjuvant in a cold crucible in order to obtain a glass melt, and said glass melt is then cooled down, whereby the alumino-borosilicate glass is obtained having the following composition expressed in percentages by mass based on the total mass of the glass:a) SiO2: 45 to 52b) B2O3: 12 to 16.5c) Na2O: 11 to 15d) Al2O2: 4 to 13e) one or more element(s) ETR selected from oxides of transition elements and platinoids: where ETR is in the range of >0 to 5.25;f) One or more element(s) TRA selected from rare earth oxides and from actinides oxides: where TRA is in the range of 0 to 3.5;g) ZrO2: 0 to 4h) Other elements AUT of the effluent: where AUT is in the range of 0 to 4;and the composition of the glass further satisfies all of the following inequations in which the SiO2, Al2O3, B2O3, Na2O, ETR, AUT are expressed in percentages by mass based on the total mass of the glass:SiO2+Al2O3<61%  (1)71%<SiO2+B2O3+Na2O<80.5%  (2)B2O3/Na2O>0.9  (3)0.7 Al2O3−ETR<5%  (4)Al2O3/ETR>2.5  (5)0.127(B2O3+Na2O)>AUT.  (6) 2. The method according to claim 1, wherein the other elements constitutive of the effluent (“AUT”) are selected from the following oxides: SO3, P2O5, MoO3, and BaO. 3. The method according to claim 1, wherein the vitrification adjuvant is characterized in that it is in the form of a glass frit. 4. The method according to claim 1, wherein the vitrification adjuvant is characterized in that it is in the form of a mixture of chemical products, especially of oxides, in the form of powders. 5. The method according to claim 1, wherein the radioactive liquid effluent of medium activity contains the following elements in the following contents:Na: from 30 g/L to 80 g/LB: from 0 g/L to 5 g/LMn: from 0 g/L to 1 g/LCe: from 0 g/L to 14 g/LFe: from 0 g/L to 3 g/LNi: from 0 g/L to 1 g/LCr: from 0 g/L to 1 g/LZr: from 0 g/L to 16 g/LMo: from 0 g/L to 10 g/LP: from 0 g/L to 4 g/LS: from 0 g/L to 1.7 g/LBa: from 0 g/L to 7 g/LGd: from 0 g/L to 1 g/LTc: 1 g/L or lessActinides: from 0 g/L to 8 g/LPlatinoids: 1 g/L or less;the total content of said elements being from 30 g/L to 154.7 g/L. 6. The method according to claim 5, wherein the radioactive liquid effluent contains the following elements in the following contents:Na: 55 g/LB: 2.5 g/LMn: 0.5 g/LCe: 7 g/LFe: 1.5 g/LNi: 0.5 g/LCr: 0.5 g/LZr: 8 g/LMo: 5 g/LP: 2 g/LS: 0.85 g/LBa: 3.5 g/LGd: 0.5 g/LTc: 1 g/LActinides: 4 g/LPlatinoids: 1 g/L;the total content of said elements being 93.35 g/L. 7. The method according to claim 1, wherein the calcination adjuvant is selected from aluminium nitrate, iron nitrate, zirconium nitrate, rare earth nitrates, and mixtures thereof. 8. The method according to claim 7, wherein the calcination adjuvant is a mixture of aluminium nitrate and of iron nitrate. 9. The method according to claim 5, wherein the Na2O/(sum of the oxides in the calcinate) ratio is less than or equal to 0.3. 10. The method according to claim 5, wherein the vitrification adjuvant is as defined in any one of claims 4 to 5. 11. The method according to claim 5, wherein the melting of the calcinate and of the vitrification adjuvant is carried out a temperature from 1,200° C. to 1,300° C. preferably 1,250° C. 12. The method according to claim 1 wherein the oxides of transition elements are selected from Fe2O3, Cr2O3, MnO2, and TcO2. 13. The glass according to claim 1 wherein the platinoids are selected from RuO2, Rh, and Pd. 14. The method according to claim 1 wherein the rare earth oxides are selected from La2O3, Nd2O3, Gd2O3, Pr2O3, and CeO2. 15. The method according to claim 1 wherein the actinides oxides are selected from UO2, ThO2, Am2O3, PuO2CmO2, NpO2. 16. The method according to claim 8, wherein the calcination adjuvant mixture of aluminium nitrate and of iron nitrate has the following proportions relating to the contents: 0.66<Al2O3/(Al2O3+Fe2O3)<1 wherein the contents are oxide contents by mass.