废弃脱硝催化剂回收过程中钨酸的制备工艺研究  

Study on Preparation Technology of Tungstic Acid during Recovery of Waste Denitrification Catalysts

作　　者：张雨薇 杨巧文[1] Zhang Yuwei;Yang Qiaowen(China University of Mining and Technology(Beijing),Beijing 100083)

机构地区：[1]中国矿业大学(北京),北京100083

出　　处：《中外能源》2025年第3期85-92,共8页Sino-Global Energy

摘　　要：由于氮氧化物(NO_(x))是大气中的主要污染物,所以大多数火电厂都采用选择性催化还原(SCR)脱硝催化剂来限制NO_(x)排放,从而产生了大量废弃的脱硝催化剂。目前如何回收利用废弃脱硝催化剂成为了环保的重点研究方向。本研究主要以国内某燃煤电厂失活SCR脱硝催化剂为研究对象,采用NaOH碱浸的方式,将催化剂中的Ti与W、V分离。本研究先将原料进行预处理、碱浸、除硅铝杂质后,再采取倒滴加法对SCR废弃催化剂回收过程中的沉钨反应条件进行探究,通过单因素实验的结果可知,当碱浸条件相同、盐酸的浓度为12mol/L时,制备的钨酸纯度和收率均为最高;反应温度为80℃时,纯度和收率均为最高;加热时间为30min时,纯度最高;加热时间为60min时,收率最高;盐酸用量为理论用量的40倍时,收率最高;盐酸用量为理论用量的50倍时,纯度最高。Because nitrogen oxides(NO_(x))are the main pollutants in the atmosphere,most thermal power plants use selective catalytic reduction(SCR)denitrification catalysts to limit NOxemissions,resulting in a large number of waste denitrification catalysts.At present,how to recycle the waste denitrification catalyst has become a key research direction of environmental protection.In this study,the deactivated SCR denitrification catalysts of a coal power plant in China were used as the research object,and NaOH alkaline leaching was used to separate Ti from W and V in the catalysts.The raw materials underwent pretreatment,alkaline leaching and the removal of impurities such as silicon and aluminum,and then the reaction conditions for tungsten precipitation during the recovery of waste SCR catalysts were investigated by using reverse drop addition.The results of single factor experiment showed that when the alkaline leaching conditions were the same and the concentration of hydrochloric acid was 12mol/L,both the purity and yield of the tungstic acid prepared were the highest.When the reaction temperature was 80℃,both the purity and yield were the highest.When the heating time was 30min,the purity was the highest.When the heating time was 60min,the yield was the highest.The highest yield was obtained when the dosage of hydrochloric acid was 40times of the theoretical dosage,and the highest purity was obtained when the dosage of hydrochloric acid was 50times of the theoretical dosage.

关 键 词：废弃SCR脱硝催化剂回收 沉钨反应 收率 纯度 

分 类 号：X773[环境科学与工程—环境工程]