《基于纳米铝基改性的核电厂冷却剂正电性净化材料构筑及性能研究》

In the operation of nuclear power plant, the filtration of coolant impurities is the key link to ensure the safe and efficient operation of the system and extend the life of the equipment. However, the existing filter materials have outstanding problems such as high import dependence (resulting in high procurement costs and long after-sales cycle), high leaching rates of soluble silicon and sulfate ions (up to 21 ppm and 141 ppm, respectively), and insufficient filtration efficiency (0.45 m particle retention rate is only 86.83%). In this study, a domestic solution based on nano-aluminum powder modified glass fiber was proposed: A new composite filter material with stable positive Zeta potential (+11 mV) was successfully prepared by in-situ grafting of AlOOH nano-layer on the surface of glass fiber by one-step hydrothermal method. The experiment showed that the material's retention efficiency of 0.45m latex ball was increased to 99.95%, and the leaching rate of soluble silicon and sulfate ion was reduced by 87.64% and 84.43%, respectively, compared with that of imported products, while maintaining the same pollution absorption capacity (60.57 g/cm) as that of imported filter material. The achievement broke through the technical bottleneck of nuclear grade filter material, and provided important technical support for improving the purification efficiency of primary coolant and reducing the radiation risk of operation and maintenance personnel.