模拟含硼浓缩液微波桶内干燥初步试验研究

Primary study on microwave in-drum drying for simulated borate concentrate

与含硼浓缩液现役水泥固化工艺相比,微波桶内干燥工艺既能减小废物体积,又能减小放射性污染。采用预试验和台架试验对微波桶内干燥模拟含硼浓缩液工艺参数进行了初步试验研究。研究结果表明,微波桶内干燥模拟含硼浓缩液是可行的。在微波桶内干燥过程中,排气口温度可作为干燥终点的判断或再次进料判断的直观指标。在批次加料干燥试验中,首次加料量务必保证适中的模拟液量,否则会引起微波反射;批次补料量越小,越有利于干燥产物性状优化。本试验条件下,推荐排气口温度上升至72℃后补料或终止干燥;推荐采用首次加料2 kg,后续补料1 kg的批次加料方式。

Compared with borate concentrate cement solidification,microwave in-drum drying technology not only decreases greatly in volume,but also constrains radioactivity in a finite field. The study was designed therefore,including pre-test and pilot test. It comes out that it is feasible to dry the simulated borate concentrate by microwave in drum. During the microwave drying process,the outlet temperature can be an intuitionistic sign of subsequence feeding. In batched drying process,the first feed must be moderate to avoid microwave reflection; the less each subsequent feed is,the better the product's characters would be. Under the test condition,it is recommended that feed SBC or end drying when outlet temperature is in excess of 72℃; the first feed is recommended to be 2 kg SBC,and subsequent feeds can be 1 kg SBC each.