RD固化剂对铀尾渣固化体力学及氡屏蔽性能的影响研究

Effect of RD Curing Agent on Curing Properties and Radon Shielding Performance of Uranium Tailings

选用市场常用的RD固化剂,配合水泥对河北省某铀矿的铀尾渣进行固化,研究了固化试块的力学性能和氡屏蔽性能,推导得出了最优氡屏蔽层计算公式;并对制作的屏蔽层开展了耐候性测试,分析了固化试块的微观机理。结果表明,在RD固化剂掺量0.08%、水泥掺量15%条件下形成的铀尾渣固化试块,其抗压强度可达3.0 MPa,氡析出率为0.39 Bq/(m^(2)·s);在氡屏蔽固化层厚度为10 cm时,铀尾渣堆表面的氡析出率下降了81.2%。在模拟环境试验中,屏蔽层表面氡析出率未出现较大波动,稳定性好。

The uranium tailings from a uranium mine in Hebei province were cured with cement and RD curing agent commonly used in the market.The mechanical properties and radon shielding properties of curing test blocks were studied,and the calculation formula for the optimal radon shielding layer was derived.The weathe rability test of the shielding layer was also carried out,and the microscopic mechanism of the curing test blocks was analyzed.The results show that the optimal mass ratio of uranium tailings curing is 0.08% RD curing agent and 15% cement.Under the optimal ratio,the compressive strength of the curing test blocks can reach 3.0 MPa,and the radon exhalation rate is 0.39 Bq/(m^(2)·s).When the thickness of the solidified layer is 10 cm,the radon exhalation rate on the surface of uranium tailings decreases by 81.2%,and the radon shielding effect is obvious.At the same time,the radon exhalation rate on the shielding layer surface did not fluctuate greatly in the artificial simulated environment test,and the stability is good.