文献类型：期刊文献

中文题名：废汞触媒高效汞回收工艺试验研究

英文题名：Study on efficient mercury recovery process from waste mercury catalysts

作者：吴磊 张彬 李安静 李杰瑞 常军 杨宏志 王勇 冯琴

第一作者：吴磊

机构：[1]贵州能矿锰业集团有限公司,贵州铜仁554001;[2]贵州重力科技环保股份有限公司,贵州铜仁554001;[3]贵州理工学院材料与能源工程学院,贵州贵阳550003;[4]铜仁学院材料与化学工程学院,贵州铜仁554300

第一机构：贵州能矿锰业集团有限公司,贵州铜仁554001

年份：2024

卷号：38

期号：3

起止页码：50-57

中文期刊名：有色设备

外文期刊名：Nonferrous Metallurgical Equipment

基金：贵州省教育厅青年科技人才成长项目(黔教合KY字[2022]352号);国家自然科学基金地区项目(52364002);贵州省高等学校绿色冶金与过程强化重点实验室(黔教技[2023]026号);铜仁市市科技计划项目(铜市科研也2021页6号)。

语种：中文

中文关键词：废汞触媒;汞;冷凝强度;冷凝效率;温度;压力;汞回收率;焙烧;氮乙烯

外文关键词：waste mercury catalyst;mercury;condensation intensity;condensation efficiency;temperature;pressure;mercury recovery rate;roasting;vinyl chloride

摘要：为进一步提升废汞触媒的汞回收率,本文对废汞触媒物化性质、影响预处理过程汞转化率及汞回收率的石灰添加量、液固比、温度、时间等工艺指标进行研究,通过对废汞触媒的成分和表面性质的测试,废汞触媒的汞含量平均为2.5%左右,主要因为积炭、硫磷中毒等因素形成废汞触媒。通过理论计算,得出汞蒸气冷凝强度最大的温度为196℃,以及20~200℃区间汞蒸气的冷凝效率(其中在170~200℃的温度区间汞的冷凝效率最大,可达64.55%),当汞蒸气冷凝至50℃以下时,可以获得99.03%的汞蒸气冷凝量。经过试验,得出了废汞触媒预处理最佳工艺条件为石灰添加量为20%,液固比为0.4 L/kg,预处理反应温度为95℃,恒温4 h;最佳高温热解焙烧工艺条件为:焙烧温度900℃、炉内负压-50 Pa、焙烧时间8 h。在上述最佳条件下,探索了三级冷凝器不同进口温度条件下气态汞的回收率实验,当一级冷凝器进口温度控制在200℃左右时,汞的回收率可达到99%以上。
In order to further improve the mercury recovery rate of waste mercury catalysts,this paper studies the physical and chemical properties of waste mercury catalysts,the amount of lime added,the liquid-solid ratio,the temperature,the time and other process indexes that affect the mercury conversion rate and the mercury recovery rate in the pre-treatment process,and the mercury content of waste mercury catalysts averages about 2.5%through the testing of the composition and the surface properties of the waste mercury catalysts,which are formed mainly because of the accumulation of charcoal,sulphur-phosphorus poisoning and other factors.The mercury content of the spent mercury catalysts was about 2.5 per cent on average.Through theoretical calculations,the temperature point of maximum condensation intensity of mercury vapour is 196℃,and the condensation efficiency of mercury vapour in the interval of 20~200℃(where in the condensation efficiency of mercury in the temperature interval of 170~200℃is the maximum,which is up to 64.55%)is derived,and when the mercury vapour is condensed to less than 50℃,the mercury vapour can be obtained as 99.03%of mercury vapour condensation.After the test,the optimal process conditions for the pretreatment of waste mercury catalysts were found to be 20%lime addition,liquid-solid ratio of 0.4 L/kg,pretreatment reaction temperature of 95℃,and constant temperature for 4 hours.The best high-temperature pyrolysis roasting process conditions are as follows:roasting temperature 900℃,negative pressure in the furnace-50 Pa,roasting time 8 hours.Under the above optimal conditions of pretreatment and high-temperature pyrolysis,experiments on the recovery of gaseous mercury under different inlet temperatures of the three-stage condenser were explored,and when the inlet temperature of the first-stage condenser was controlled to be approximately 200℃,the recovery rate of mercury could reach more than 99%.