Preparation method of cesium adsorption enrichment filter element

Abstract

The invention discloses a preparation method of a cesium adsorption enrichment filter element. The method is characterized by comprising the following steps: taking raw materials including 100 partsby weight of metakaolin, 85-130 parts by weight of a water glass solution, 20-65 parts by weight of a surfactant solution, and 0-3 parts by weight of chopped fibers, and performing mixing to obtain slurry; pouring the slurry into a steel mold, performing sealing, placing the mold in an environment of temperature of 15-25 DEG C and humidity >= 90%, performing maintenance for 3 days, and performingdemolding; and continuing maintenance to 28th day, performing drying, and performing cooling to obtain the cesium adsorption enrichment filter element. According to the preparation method provided bythe invention, the cesium adsorption enrichment filter element prepared by the method has compressive strength of 0.5-10.0 MPa, an apparent density of 200-800 kg / m<3>, porosity of 75-90%, and cerium ion adsorption capacity of > 60 mg / g; and when the method is adopted, the filter element is prepared at a room temperature, has the cesium adsorption enrichment function, high cesium adsorption capacity and good mechanical properties, and can be used for purification treatment of wastewater containing radioactive cesium.

Description

technical field [0001] The invention belongs to the preparation of filtration and adsorption materials and the treatment of cesium-containing radioactive waste liquid, and relates to a preparation method of a cesium adsorption and enrichment filter element. The cesium adsorption and enrichment filter element prepared by the invention is particularly suitable as a filter adsorption material for the treatment of cesium-containing radioactive wastewater. Background technique [0002] The nuclear industry, nuclear facilities / equipment operation, maintenance, decommissioning and accidents will produce radioactive wastewater. Before the final treatment and disposal, the radioactive wastewater needs to be treated to reduce its nuclide content and radioactive level. At present, the relatively mature treatment methods for radioactive wastewater are chemical precipitation, evaporation and ion exchange. 137 Cs is one of the most important fission products contained in radioactive wast...

AI Technical Summary

Problems solved by technology

But there are still the following problems: the chemical precipitant or ion exchange / adsorbent is transition metal ferricyanide, phosphotungstate or phosphomolybdate, tetraphenyl borate, inorganic phosphate, zeolite, resin powder Or particles, sedimentation mud is difficult to separate, organic matter is easy to decompose, exchange adsorption selection and competition make the adsorption and separation efficiency of cesium low, and the precipitation and adsorption products are more difficult to handle; in the process of ion adsorption and exchange, in order to facilitate separation, cesium ion exchange adsorption Many agents need to be loaded on the porous filter element, and the filter element for loading and exchanging adsorbent needs to be prepared separately; the maintenance process of the treatment system is complicated, the requirements for equipment are high, the operation is difficult, and the cost is high

All of the above make the adsorption and separation of cesium a difficult point in the pretreatment process of radioactive wastewater. At present, there is still a lack of filter materials with high efficiency adsorption, separation and enrichment of cesium and its preparation process

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