Method for carrying out cement solidification on radioactive raffinate by using NaAlO2 and Ca(OH)2 coagulant
A cement curing and radioactive technology, applied in radioactive purification, nuclear engineering, etc., can solve the problems of low nuclide leaching rate and mechanical strength of the solidified body, and achieve high compressive strength
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[0014] Example 1
[0015] 1963g sulphoaluminate cement, 212g composite mineral additives (zeolite: slag: silica fume: fly ash = 5:10:9:4), 21.6g NaAlO 2 , 43.2g Ca(OH) 2 Mix evenly, stir with 1L simulated radioactive steam residue (boron concentration 38.8g / L) in a stirring pot for 3 minutes, fill the stirred slurry once to determine the setting time to test the mold, shake it for several times and then put it in In the curing box, the curing temperature is 20±1℃, and the relative humidity is ≥90%. After curing, the initial setting time is measured at 30 min after the start of stirring. After the initial setting time is measured, the setting time test model is turned over to continue curing, and the final setting time is measured. The measured initial setting and final setting time were 6.4h and 20.3h, respectively.
Example Embodiment
[0016] Example 2
[0017] 1963g sulphoaluminate cement, 212g composite mineral additives (zeolite: slag: silica fume: fly ash = 5:10:9:4), 21.6g NaAlO 2 , 43.2g Ca(OH) 2 Mix uniformly, stir with 1L simulated radioactive steam residue (boron concentration 38.8g / L) in a stirring pot for 3min, move to a Φ50mm×50mm mold, prepare a solidified body, calculate the total volume of the solidified body and calculate the solidification based on this The volume package capacity of waste resin in the body, the obtained package capacity value is 62%.
Example Embodiment
[0018] Example 3
[0019] 1963g sulphoaluminate cement, 212g composite mineral additives (zeolite: slag: silica fume: fly ash = 5:10:9:4), 21.6g NaAlO 2 , 43.2g Ca(OH) 2 Mix evenly, stir with 1L simulated radioactive steam residue (boron concentration 38.8g / L) in a stirring pot for 3min, move to a Φ50mm×50mm mold, and cure. The curing temperature is 25±5°C, and the relative humidity is ≥90%. . After curing for 48 hours, demould, and after curing for 7 days, the upper and lower surfaces are properly sanded with sandpaper to keep the upper and lower surfaces parallel, and then the unconfined compressive strength is measured on the pressure testing machine. The measured 7d compressive strength is 20.3MPa.
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