氯酸盐系列湿式氧化Hg^0的影响因子实验研究  

RESEARCH ON THE IMPACT FACTORS IN WET OXIDATION OF Hg^0 BY CHLORATE SERIES

作　　者：阮长超 胡辉[1] 黄浩 田路泞 张锦丽[1] 

机构地区：[1]华中科技大学环境科学与工程学院,武汉430074 [2]武汉光谷环保科技股份有限公司,武汉430074

出　　处：《环境工程》2017年第11期76-81,共6页Environmental Engineering

基　　金：国家自然科学基金(50677026);武汉市应用基础研究计划项目(2015060101010068)

摘　　要：采用湿式氧化方法,分别考察了次氯酸钠、亚氯酸钠、氯酸钠和高氯酸钠4种氯酸盐氧化剂,对模拟烟气中零价汞(Hg^0)氧化为二价汞(Hg^(2+))的影响。结果表明:氯酸盐吸收液浓度、pH、反应温度等参数对氧化剂氧化吸收Hg^0有明显影响。氯酸盐系列氧化剂对Hg^0氧化为Hg^(2+)的能力依次为NaClO_4>NaClO>NaClO_3>NaClO_2。在氧化剂浓度为4 mmol/L、反应温度为20℃、吸收液pH为2时,NaClO_4将Hg^0氧化为Hg^(2+)的氧化效率为92%,pH为6时,氧化效率为84%,即酸性条件影响氯酸盐系列对Hg^0的氧化能力,但氯酸盐系列对Hg^0具有更好的氧化能力与汞蒸气的初始浓度无明显关联。The paper studied the oxygenation efficiency of elemental mercury（Hg^0） to divalent mercury（ Hg^2＋） when used the wet oxidation method. In the experiment,the influence of oxidizing agents such as sodium hypochlorite,sodium chlorite and sodium chlorateand, sodium perchlorate were investigated. Experimental results showed that the parameters like the concentration of chlorate absorbing liquid concentration,pH,reaction temperature had remarkable influence on the oxygenation efficiency of Hg^0. The oxidation ability of the series of chlorate oxidant was in sequence of： NaClO4 NaClO NaClO3NaClO2. When the experimental conditions were controlled as the concentration of oxidant was 4 mmol/L,reaction temperature was 20 ℃,the initial pH of absorbing liquid was 2,by NaClO4 solution,the oxidation efficiency of Hg^0 to Hg^2＋ was 92%,and when pH was at 6,and the oxidation efficiency dropped to 84%. Absorbing liquid had better absorption removal efficiency under acid condition,initial concentration of mercury vapor almost had no relation with its removal efficiency.

关 键 词：氯酸盐系列 氧化剂 汞 湿式氧化 

分 类 号：X701[环境科学与工程—环境工程]