Pretreated water-quenched-manganese-slag slurry for high-efficiency one-step desulfurization and denitrification
Pretreated water-quenched-manganese-slag slurry for high-efficiency one-step desulfurization and denitrification
复制标题
DOI：
10.1016/j.seppur.2020.117164
复制
发表时间：
2020-11
影响因子：
8.6
通讯作者：
Yansu Luo;P. Ning;Chi Wang;Fei Wang;Yixing Ma;Jiacheng Bao;Sun Xin;Kai Li
中科院分区：
文献类型：
--
作者：
Yansu Luo;P. Ning;Chi Wang;Fei Wang;Yixing Ma;Jiacheng Bao;Sun Xin;Kai Li
目前，利用低成本的纸浆或炉渣进行脱硫脱硝的研究在全球范围内受到广泛关注。然而，NOx转化的效率仍然很低并且持续时间很短。因此，我们尝试采用预煅烧加添加剂煅烧预处理，再与KMnO 4混合（氧化吸收一步完成，无需预氧化）的方法对水淬锰渣进行活化。在最佳条件下，NOx和SO2的去除率分别达到84.9%和100%。加入预处理后的WQMS后，当脱氮率大于65%时，料浆对NOx的吸收量可达228.65 mg/L，是纯KMnO 4的3.6倍。预处理后脱氮效率的提高与水相微生物系统的相结构变化、锰的价态增加以及水相微生物系统较高的碱度有关。并提出了同时脱硫脱硝的机理。综上所述，本研究为同时脱除SO2和NOx提供了一种新的一步法策略。
Presently, researches on the use of low-cost pulp or slag for desulfurization and denitrification has attracted much attention globally. However, the efficiency of the NOxconversion remains low and has a short duration. Therefore, we tried to activate the water-quenched-manganese-slag (WQMS) through the pretreatment method of calcination and additive calcination then mixed with KMnO4(oxidation and absorption in one step without pre-oxidation). The obtained removal efficiency of NOxand SO2was high as 84.9% and 100% under optimal conditions. After adding the pre-treated WQMS, the absorption of NOxby the slurry increased to 228.65 mg/L when denitrification rate was more than 65%, which is 3.6 times that of pure KMnO4. The increased denitrification efficiency after pre-processing was affected by the phase structure change of the WQMS, increased valence state of manganese, as well as the higher alkalinity of the WQMS. Furthermore, the mechanism of simultaneous desulfurization and denitrification was proposed. In summary, this study provided a new one-step strategy to simultaneously remove SO2and NOx.