高放玻璃固化尾气中净化钌的滤材筛选

SELECTION OF MATERIALS FOR THE REMOVAL OF VOLATILE Ru FROM VITRIFICATION OFF-GAS OF HIGH-LEVEL RADIOACTIVE WASTES

高放废液玻璃固化过程中,钌是最容易挥发的元素,给尾气处理带来困难。文章收集了大量的过滤材料,经初步筛选,选定为KSG-1抗爆硅胶和W-X-14三氧化二铁,并分别测定了过滤柱的温度、滤材装填高度、气流速度、滤材的捕集量以及NO_2,SO_2气体等对钌的过滤效率的影响。结果表明KSG-1(温度120℃),W-X-14(温度500℃)对钌的去污因数均≥1×10~4。净化效果是令人满意的。

Ruthenium is rather volatile in the process of glass-solidification of high-levelliquid radioactive wastes, so it is very important to remove ruthenium from off-gas treatment system. In this work, materials such as KSG-1 non-decrepitation silicagel and W-X-14artificials ferric oxide are selected to study the factors of effective removal ofruthenium, such as characters of volatile ruthenium, temperature of sorptioncolumn, column height, flow rate of off-gases, feed solution concentration,sorption capacity as well as incondensable gases (NO-x, SO-2, etc.). Ru decontamina-tion factors of KSG-1 non-decrepitation silicagel (120℃) and W-X-14 ferric oxide(500℃) are found to be higher than 1×10~4, and can be used to remove volatileruthenium from vitrfication off-gas of high-level radioactive wastes.