Patent Number: 
Section: claims

1. A process for treating a material that contains leachable radioactive substances, said process comprising the steps of: contacting said material with a suspension comprising a first component and a second component to form a mixture, wherein said first component supplies at least one member selected from the group consisting of sulphates, hydroxides, chlorides, fluorides, magnesium, halides, halites, magnesium aluminum silicates and calcium oxide, and wherein said second component supplies at least one phosphate anion; and  curing said mixture for a period of time to form a cured material;  wherein the concentration of leachable radioactive substances in said material so treated is decreased and non-leachable solid materials are formed. 2. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said first component or said second component is a liquid. claim 1 3. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said first component is a magnesium aluminum silicate. claim 1 4. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said second component is an aqueous phosphate reagent. claim 1 5. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said second component is phosphoric acid. claim 1 6. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said second component is monocalcium phosphate. claim 1 7. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said second component is tetrasodium pyrophosphate. claim 1 8. The process of treating a material that contains leachable radioactive substances according to  claim 1 , further comprising a third component, wherein said suspension further comprises a third component which supplies at least one phosphate anion. claim 1 9. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said suspension further comprises a third component selected from the group consisting of phosphoric acid, pyrophosphates, triple super phosphate, trisodium phosphate, potassium phosphates, ammonium phosphates, monocalcium phosphate and tetrasodium pyrophosphate. claim 1 10. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said suspension comprises monocalcium phosphate, tetrasodium pyrophosphate and a magnesium aluminum silicate. claim 1 11. The process of treating a material that contains leachable radioactive substances according to  claim 1 , wherein said metal-bearing material is a sludge. claim 1 12. A process for treating soil that contains leachable radioactive substances, said process comprising the steps of: contacting a soil containing radioactive substances with a suspension comprising a first component and a second component to form a mixture, wherein said metal-bearing soil contains at least one leachable metal selected from the group consisting of lead, aluminum, arsenic (III), barium, bismuth, cadmium, chromium (III), copper, iron, nickel, selenium, silver and zinc, wherein said first component supplies at least one member selected from the group consisting of sulphates, hydroxides, chlorides, fluorides, magnesium, halites, halides, silicates and calcium oxide, and wherein said second component supplies at least one phosphate anion; and  curing said mixture for a period of time to form a cured material;  wherein the concentration of leachable radioactive substances in said soil so treated is decreased and non-leachable solid materials are formed. 13. The process of treating soil according to  claim 12 , wherein said first component or said second component is a liquid. claim 12 14. The process of treating soil according to  claim 12 , wherein said first component is a magnesium aluminum silicate. claim 12 15. The process of treating soil according to  claim 12 , wherein said second component is an aqueous phosphate reagent. claim 12 16. The process of treating soil according to  claim 12 , wherein said second component is phosphoric acid. claim 12 17. The process of treating said metal-bearing soil of  claim 12 , wherein said second component is monocalcium phosphate. claim 12 18. The process of treating soil according to  claim 12 , wherein said second component is tetrasodium pyrophosphate. claim 12 19. The process of treating soil according to  claim 12 , wherein said suspension further comprises a third component which supplies at least one phosphate anion. claim 12 20. The process of treating soil according to  claim 12 , wherein said suspension further comprises a third component selected from the group consisting of phosphoric acid, pyrophosphates, triple super phosphate, trisodium phosphate, potassium phosphates, ammonium phosphates, monocalcium phosphate and tetrasodium pyrophosphate. claim 12 21. The process of treating soil according to  claim 12 , wherein said suspension comprises monocalcium phosphate, tetrasodium pyrophosphate and a magnesium aluminum silicate. claim 12 22. A process for treating a waste matrix of metal-bearing material and soil that contains leachable radioactive substances, said process comprising the steps of: contacting said waste matrix with a suspension comprising a first component and a second component to form a mixture, wherein said metal-bearing material contains at least one leachable metal selected from the group consisting of lead, aluminum, arsenic (III), barium, bismuth, cadmium, chromium (III), copper, iron, nickel, selenium, silver and zinc, wherein said first component supplies at least one member selected from the group consisting of sulphates, hydroxides, chlorides, fluorides, magnesium, halites, halides, silicates and calcium oxide, and wherein said second component supplies at least one phosphate anion; and  curing said mixture for a period of time to form a cured material;  wherein the concentration of leachable radioactive substances in said material so treated is decreased and non-leachable solid materials are formed. 23. The process of treating a waste matrix according to  claim 22 , wherein said first component or said second component is a liquid. claim 22 24. The process of treating a waste matrix according to  claim 22 , wherein said first component is a magnesium aluminum silicate. claim 22 25. The process of treating a waste matrix according to  claim 22 , wherein said second component is an aqueous phosphate reagent. claim 22 26. The process of treating a waste matrix according to  claim 22 , wherein said second component is phosphoric acid. claim 22 27. The process of treating a waste matrix according to  claim 22 , wherein said second component is monocalcium phosphate. claim 22 28. The process of treating a waste matrix according to  claim 22 , wherein said second component is tetrasodium pyrophosphate. claim 22 29. The process of treating a waste matrix according to  claim 22 , wherein said suspension further comprises a third component which supplies at least one phosphate anion. claim 22 30. The process of treating a waste matrix according to  claim 22 , wherein said suspension further comprises a third component selected from the group consisting of phosphoric acid, pyrophosphates, triple super phosphate, trisodium phosphate, potassium phosphates, ammonium phosphates, monocalcium phosphate and tetrasodium pyrophosphate. claim 22 31. The process of treating a waste matrix according to  claim 22 , wherein said suspension comprises monocalcium phosphate, tetrasodium pyrophosphate and a magnesium aluminum silicate. claim 22