Method for electrolysis and deep purification of waste liquid produced in Fenton oxidation of radioactive spent resin and for recovery of sulfuric acid

Abstract

The invention relates to a method for electrolysis and deep purification of waste liquid produced in Fenton oxidation of radioactive spent resin and for recovery of sulfuric acid, belonging to the technical field of treatment of radioactive waste. The method comprises the following steps: (1) sending the waste liquid produced in Fenton oxidation of radioactive spent resin into an electrolytic cellfor electrolysis, wherein an electrolytic cell cathode chamber and an electrolytic cell anode chamber are segmented from the electrolytic cell and located at two sides, an electrolysis cell cathode is arranged in the electrolysis cell cathode for concentration of negative ion, and an electrolytic cell anode is arranged in the electrolytic cell anode chamber for concentration of ions; and (2) sending an electrolytic product in the electrolytic cell cathode chamber to a reduction pool for reduction, wherein the reduction pool is divided into a reduction pool cathode chamber and a reduction poolanode chamber, a reduction pool cathode is arranged in the reduction pool cathode chamber for reducing radioactive metal nuclide cations flowing into the reduction pool cathode chamber, and a reduction pool anode is arranged in the reduction pool anode chamber. The method of the invention can better realize the electrolysis and deep purification of waste liquid produced in Fenton oxidation of radioactive spent resin and the recovery and reuse of sulfuric acid.

Description

Technical field [0001] The invention belongs to the technical field of radioactive waste treatment, and relates to a method for deep electrolytic purification of waste radioactive resin Fenton oxidation waste liquid and sulfuric acid recovery. Background technique [0002] Radioactive waste resin containing organic matter is currently one of the difficulties in the management of radioactive waste at home and abroad (currently the radioactive waste resin produced by nuclear military units is mostly in a temporary storage state, and the radioactive waste resin produced by nuclear power plants is mostly processed by traditional cement curing processes). [0003] There are currently two technical solutions in use for the treatment of waste radioactive resin oxidation waste liquid, one is cement curing treatment, and the other is deep purification treatment. The internationally accepted method is to solidify the waste radioactive resin oxidation waste liquid by evaporation and concentrat...

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Problems solved by technology

[0004] The advantage of cement solidification treatment is that the process is simple and mature, and the treatment cost is low. After the waste liquid cement is solidified, it can directly meet the final disposal requirements. The liquid needs to be evaporated and concentrated for a long time before being solidified with cement, and there are technical bottlenecks in the expansion of waste and the long-term stability of the solidified body

There are two commonly used technical routes for the deep purification of radioactive waste liquid: one is the membrane treatment process. The disadvantage is that the high selectivity of the membrane is closely related to the characteristics of the waste liquid. Before membrane treatment, filtration, ion exchange, microfiltration and even ultrafiltration are required. The second is ion exchange and adsorption, which requires the use of adsorbents with high adsorption performance for different nuclides. Adsorption separation of Cs-137 and Sr-90 in radioactive wastewater)

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