Effect of leaching conditions on the elution of metals from denitration catalyst wastes
Effect of leaching conditions on the elution of metals from denitration catalyst wastes
复制标题
浸出条件对脱硝催化剂废液中金属洗脱的影响
DOI：
10.1142/s0217979218400623
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发表时间：
2018
影响因子：
1.7
通讯作者：
Yohei Yamada
中科院分区：
文献类型：
--
作者：
Tomoki Yabutani;Takamasa Nakamura;Toshio Takayanagi;Yohei Yamada
在不同的浸出条件下，用不同的溶剂对脱氮催化剂废渣中的金属进行了浸出实验。过碳酸钠溶液的浸出效率高于过氧化氢和碳酸钠溶液。在最佳浸出条件(1.0g/L过碳酸钠，浸出温度80℃，浸出时间5h)下，钨、钒、钛的浸出率分别为90.7±2.9%、78.4±4.1%和8.6±0.4%。过碳酸钠浸出能力的提高是由于过碳酸盐中过氧化氢的过氧基团(-O-O-)对金属离子的高亲和力以及二氧化钛在碳酸盐碱性介质中的溶解。
Leaching of metallic species from denitration catalyst waste was performed at different leaching conditions using different solvents. The leaching efficiency of sodium percarbonate solution was higher than that of hydrogen peroxide (H2O2) or sodium carbonate solution. Under the optimal leaching conditions (1.0 mol kgsodium percarbonate, leaching temperature of 80C and leaching time of 5 h), the leaching rate was 90.7 ± 2.9% for W, 78.4 ± 4.1% for V and 8.6 ± 0.4% for Ti. The enhanced leaching ability of sodium percarbonate was due to the high affinity of the peroxo moiety (–O–O–) of H2O2, within the percarbonate, towards metallic ions and dissolution of titanium dioxide (TiO2) in the alkaline medium of carbonate.