废TBP煤油悬浮液配方试验研究

Experimental Study on the Formula of Spent TBP Kerosene Suspension

直接焚烧核燃料后处理过程中产生的磷酸三丁酯(TBP)和煤油(OK)有机废液产生的磷酸会对设备造成腐蚀,在采用热解焚烧工艺处理该废液时,需掺入合适比例的中和剂和表面活性剂等添加剂,将废液配制成均匀稳定的悬浮液。中和剂在热解过程中可以固定五氧化二磷,避免磷酸生成腐蚀设备。本文通过不同单因素实验研究各原料的掺量以及搅拌速率对悬浮液性能的影响,优化后处理厂热解焚烧供料系统的悬浮液配方。试验结果显示:当TBP的体积含量为30%~60%时,所制备的悬浮液性能较好,可作为悬浮液配制的基础方案,而当TBP的体积含量大于80%时,制备的悬浮液稳定性变差,乳液相破乳并发生沉降,悬浮液整体性能不佳。当TBP体积含量分别为30%和60%时,在钙磷比为1.25~1.75,乳化剂含量为1%~2%,含水量为8%~12%,DBP含量分别不超过0.26%和0.6%的条件下,所制备的悬浮液成乳情况和流动性较好,粘度和稳定时间满足要求,产生的二次废物少,悬浮液可以应用于TBP/OK有机废液热解焚烧处理工程中。

The phosphoric acid produced from the organic waste liquid of tributyl phosphate(TBP)and kerosene(OK)generated during the post-treatment process of direct incineration of nuclear fuel can cause corrosion to the equipment.When using the pyrolysis incineration process to treat this waste liquid,appropriate proportions of neutralizing agents and surfactants need to be added to prepare the waste liquid into a uniform and stable suspension.Neutralizing agents can fix phosphorus pentoxide during the pyrolysis process,avoiding the formation of phosphoric acid and corrosion of equipment.This article studies the effects of the dosage and stirring rate of various raw materials on the performance of suspension through different single factor experiments,and optimizes the suspension formula of the pyrolysis incineration feeding system in the post-treatment plant.The test results show that when the volume content of TBP is 30%~60%,the prepared suspension has good performance,which can be used as a basic scheme for suspension preparation.When the volume content of TBP is greater than 80%,the prepared suspension has poor stability,lotion phase demulsification and sedimentation,and the overall performance of the suspension is poor.When the volume content of TBP is 30%and 60%respectively,under the conditions of a calcium phosphorus ratio of 1.25~1.75,an emulsifier content of 1%~2%,a water content of 8%~12%,and a DBP content of no more than 0.26%and 0.6%,the prepared suspension has good emulsifying and flowability,meets the requirements for viscosity and stability time,and produces less secondary waste.The suspension can be applied in the thermal decomposition and incineration treatment of TBP/OK organic waste liquid.