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以钕和铈作为放射性铀和钚的模拟核素,采用碱激发和水热法制备了模拟中放α废液“碱-矿渣-粉煤灰-煅烧高岭土”水合陶瓷固化体。研究了固化体的结构组成、力学性能、抗侵蚀性和化学稳定性。结果表明:固化体的主要晶相组成为方沸石和NaPl沸石;在水热条件下,固化体中掺入模拟中放α废液后有利于沸石晶相的形成。抗压强度测试表明,固化体中废物包容量达到40%左右时仍能满足水泥固化体抗压强度的要求。固化体经硫酸盐介质和地下水侵蚀28 d后,其抗压强度损失较少,外观没有裂纹和龟裂,说明固化体具有较好的的抗硫酸盐和地下水侵蚀性能。另外,静态浸出测试结果表明,Nd和Ce的浸出率在10~(-8)~10~(-6)cm/d范围,说明固化体具有优良的化学稳定性。
Using neodymium and cerium as the simulated nuclides of radioactive uranium and plutonium, the alkali-activated and hydrothermal method was used to prepare a simulated solid-phase a-waste liquid “alkali-slag-fly ash-calcined kaolin” hydrated ceramic solidification body. The structure, mechanical properties, corrosion resistance and chemical stability of the cured body were studied. The results show that the main crystalline phase of the solidified body is the analcime and the NaPl zeolite. Under hydrothermal conditions, the solidification of the zeolite is beneficial to the formation of the zeolite crystalline phase after the mixed α-waste liquid is simulated. The compressive strength test shows that the solidified body can still meet the compressive strength of cement cured body when its waste volume reaches 40%. After cured for 28 days by sulphate and groundwater, the solidified body has less loss of compressive strength and no appearance of cracks and cracks. It shows that the cured body has better resistance to sulfate and groundwater erosion. In addition, the static leaching test results show that Nd and Ce leaching rate in the range of 10 -8 (-8) cm / d, indicating that the cured body has excellent chemical stability.