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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

Inactive Publication Date: 2011-11-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Sulphoaluminate cement is added with minerals to add solidified steam raffinate, the nuclide leaching rate is low, and the mechanical strength of the solidified body is high, but it is also affected by boron when solidifying boron-containing steam raffinate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] With 1963g sulfoaluminate cement, 212g composite mineral additive (zeolite: slag: silica fume: fly ash=5:10:9:4), 21.6g NaAlO 2 , 43.2g Ca(OH) 2 Mix evenly, and stir with 1L simulated radioactive distillation raffinate (boron concentration: 38.8g / L) in the stirring pot for 3 minutes, fill the stirred slurry once to measure the coagulation time test mold, vibrate several times to scrape the surface and put it into In the curing box, the curing temperature is 20±1°C, and the relative humidity is ≥90%. Measure the initial setting time after curing until 30 minutes after the start of stirring. After the initial setting time is measured, turn the setting time test mold over to continue curing, and measure the final setting time. The measured initial and final setting times were 6.4h and 20.3h, respectively.

Embodiment 2

[0017] With 1963g sulfoaluminate cement, 212g composite mineral additive (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 distillation raffinate (boron concentration: 38.8g / L) in a stirring pot for 3 minutes, move to a Φ50mm×50mm mold to prepare a cured body, calculate the total volume of the cured body and calculate the solidification based on this The waste resin volume inclusion capacity in the body was obtained to obtain a inclusion capacity value of 62%.

Embodiment 3

[0019] With 1963g sulfoaluminate cement, 212g composite mineral additive (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 distilled raffinate (boron concentration: 38.8g / L) in a stirring pot for 3 minutes, move to a Φ50mm×50mm mold, and cure at a temperature of 25±5°C and a relative humidity of ≥90% . After curing for 48 hours, remove the mold, and after curing for 7 days, the upper and lower surfaces are properly polished with sandpaper to keep the upper and lower surfaces parallel, and then the unconfined compressive strength is measured on a pressure testing machine. The measured 7d compressive strength is 20.3MPa.

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Abstract

The invention discloses a method for carrying out cement solidification on radioactive raffinate by using NaAlO2 and Ca(OH)2 coagulant, belonging to the technical field of cement solidification on radioactive raffinate. The method comprises the following steps of: evenly mixing sulphoaluminate cement, a composite mineral additive, NaAlO2 and Ca(OH)2 to obtain a mixture, stirring the mixture and the radioactive raffinate in a stirring pot, moving to a die and curing. When the radioactive raffinate is solidified by using the method disclosed by the invention, the boron concentration of the solidified radioactive raffinate can reach 45g / L, the capacity of the raffinate in the solidified body can reach 60 percent, the final setting time is shortened to be within 24h, the appropriate initial setting time can be ensured for solidification operation, and the solidified body can have higher compressive strength.

Description

technical field [0001] The invention belongs to the technical field of solidification of radioactive distilled raffinate cement, in particular to a method using NaAlO 2 and Ca(OH) 2 A method for solidifying radioactive distilled raffinate with coagulant cement. Background technique [0002] Evaporation technology is one of the main methods for the treatment of radioactive waste liquid in nuclear power plants, and the decontamination factor can reach 10 3 ~10 4 (Does not contain washing wastewater), strong technical adaptability. After treatment, most nuclides are enriched in the distillation raffinate, which needs to be solidified before final disposal. Cement solidification is widely used in the solidification of medium and low-level radioactive waste. The solidified body has stable performance, simple equipment, and is easy to operate. However, the waste containment capacity in the solidified body is low, the volume expansion ratio of the solidified body is large, and ...

Claims

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Application Information

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IPC IPC(8): G21F9/06G21F9/16C04B28/36
Inventor 王建龙孙奇娜李俊峰
Owner TSINGHUA UNIV
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