Nuclear power station radioactive evaporation residual liquid cement solidified body and preparation method thereof

Abstract

The invention discloses a nuclear power station radioactive evaporation residual liquid cement solidified body and a preparation method thereof. The nuclear power station radioactive evaporation residual liquid cement solidified body comprises a radioactive evaporation residual liquid, cement and a special curing additive at a mass ratio of (4-4.5):(7- 8):(2-3), and the preparation method comprises the steps: adding the special curing additive to the radioactive evaporation residual liquid firstly, then adding the cement, and performing stirring so as to obtain the solidified body. The radioactive evaporation residual liquid is composed of 93-98% of water, 2-5% of boric acid, 0.5-1% of mannitol and 0.2-1% of sodium hydroxide, and the special curing additive is composed of 40-60% of mineralpowder, 17-45% of diatomaceous earth, 10-20% of zeolite powder, 0.2-0.4% of starch ether and 2-4% of a powder polycarboxylic acid water reducing agent. The compatibilization rate of the cement solidified body can be reduced to 75%, high fluidity and high water retention can still be maintained at the same time, and requirements of the national standard GB14569.1-2011 can be met; and the retardation effect of boric acid on the cement can be reduced greatly, and the effect of controllable condensation time is achieved.

Description

technical field [0001] The invention relates to the field of cement solidification of nuclear power radioactive distillation residue, in particular to a cement solidification body of nuclear power plant radioactive distillation residue and a preparation method thereof. Background technique [0002] The safe disposal of low- and intermediate-level waste during the operation of nuclear power plants is of great significance to the sustainable development of nuclear energy and nuclear technology utilization in my country, environmental safety and public safety. which contains 137 Cs, 90 Sr, 60 Low-to-medium-level radioactive wastewater of Co and other radionuclides, including process wastewater, ground drainage, and chemical wastewater, needs to be treated by heat pump evaporation and drying and volume reduction processes. After evaporation to form a distilled raffinate, cement, asphalt, glass, plastic, etc. Carry out final curing treatment to convert harmful substances into ...

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Problems solved by technology

[0005] Aiming at the special requirements of some nuclear power plants for the solidified body of radioactive distillation residue cement in nuclear power plants, the present invention overcomes the problems of high solidification rate of distillation residue cement, bleeding stratification, rapid loss of fluidity over time, and too slow setting time. The main purpose of this paper is to provide a formula for the solidified body of radioactive distillation residue cement in nuclear power plants, so that the solidified body of steam residue cement can meet the national standard GB14569. There is no bleeding and layering phenomenon in the body, the initial fluidity reaches 220mm-250mm, and the fluidity is maintained well, and the final setting time is within 24h and other special requirements

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