Patent Number: 
Section: claims

1. A method for co-solidifying sulfate solution and spent ionexchange resins, comprising the steps of: converting the sodium sulfate solution into a slurry of sodium hydroxide and barium sulfate;  removing water from the slurry by evaporation;  mixing the slurry with the ion-exchange resins to form mixed wastes; and  homogeneously mixing a powdery solidification agent prepared from cement, pozzolanic materials and at least one species of oxides or salts of divalent metals into the mixed wastes to form a mixture of mixed wastes and solidification agent and leaving the mixture of mixed wastes and solidification agent for setting and hardening; wherein after the removal of water, water content of the slurrv is less than 50%. 2. The method as claimed in  claim 1 , wherein the solidification agent includes oxides or salts selected from the group consisting of borates, silicates, carbonates, and phosphates. claim 1 3. The method as claimed in  claim 1 , wherein the solidification agent includes oxides or salts selected from the group consisting of oxides and salts of calcium, silicon, magnesium, aluminum, iron, and zirconium. claim 1 4. The method as claimed in  claim 1 , wherein the pozzolanic materials in the solidification agent are selected from the group consisting of silica fume, blast furnace slag powders and fly ash. claim 1 5. The method as claimed in  claim 4 , wherein a weight ratio of the solidification agent to the mixed wastes is less than  1 . claim 4 6. The method as claimed in  claim 4 , wherein the mixed wastes and the solidification agent are mixed at a temperature below 90xc2x0 C. claim 4