Dynamic zinc and potassium release from a burning hyperaccumulator pellet and their interactions with inhibitive additives
Dynamic zinc and potassium release from a burning hyperaccumulator pellet and their interactions with inhibitive additives
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燃烧的超富集颗粒中锌和钾的动态释放及其与抑制性添加剂的相互作用
DOI：
10.1016/j.fuel.2020.119365
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发表时间：
2021-02
期刊：
影响因子：
7.4
通讯作者：
Yanqun Zhu
中科院分区：
文献类型：
--
作者：
Yong He;Siyu Liu;Yingzu Liu;Zhihua Wang;Zhiwei Sun;Jun Xia;Yanqun Zhu
金丝桃作为一种特殊的植物，具有吸收重金属污染土壤的能力。因此，由于需要避免重金属的二次污染，超富集植物生物质的热利用更具挑战性。为了研究超富集植物燃烧过程中碱金属和重金属的动态释放，采用多点激光诱导击穿光谱（LIBS）技术对东南景天（Sedum alfredii）颗粒燃烧过程中锌（Zn）和钾（K）的释放进行了研究。结果表明，东南景天燃烧过程中Zn和K的释放量分别为24.2%和61.5%，(1)脱挥发分和（2）炭和灰反应。第二阶段为主要释放阶段，分别占Zn和K释放总量的69.8%和77.6%。采用LIBS技术研究了不同化学基团的Zn和K在溶剂分级处理后东南景天中的释放特性。NH_4Ac溶出的Zn和H_2O溶出的K分别是主要的Zn和K释放基团。此外，还研究了两种合成添加剂二氧化硅（SiO2）和氧化铝（Al 2 O3）以及两种天然矿物添加剂高岭土和云母对锌和钾释放的抑制作用。四种添加剂对钾通过铝硅酸盐反应和物理吸附释放的抑制率均大于55%。然而，这些添加剂对锌的保持性能不如对钾的保持性能好。Al_2O_3对Zn的截留率最高，为37.0%，其机理可能是通过Ca-Al-Zn转化机制将挥发性Zn转化为Ca_3Al_4ZnO_（10）。
Hyperaccumulators, as a special plant, are capable of absorbing heavy metals from contaminated soil. Thermal utilization of hyperaccumulator biomass is therefore more challenging, due to the requirement of avoiding secondary pollution of heavy metals. To investigate dynamic alkali and heavy metal release during hyperaccumulator combustion, we used multi-point laser-induced breakdown spectroscopy (LIBS) to measure zinc (Zn) and potassium (K) release from a burning Sedum alfredii pellet. The results show that 24.2% of Zn and 61.5% of K are released during the Sedum alfredii combustion through two stages, i.e., (1) devolatilization and (2) char and ash reactions. The latter is the primary release stage, accounting for 69.8% and 77.6% of the total released Zn and K, respectively. The release characteristics of different chemical groups of Zn and K are then studied by performing LIBS on Sedum alfredii treated with solvent fractionation in three sequential steps. NH4Ac-soluble Zn and H2O-soluble K are found to be the primary released Zn and K groups, respectively. Furthermore, inhibition effects of two synthetic additives, silica (SiO2) and alumina (Al2O3), and two natural mineral additives, kaolin, and mica, on Zn and K release have been investigated. All the four additives achieve an inhibition efficiency higher than 55% on K release through aluminosilicate reactions and physical absorption. However, the performance of these additives on Zn retention is not as good as for K. The highest Zn retention efficiency is 37.0% achieved by Al2O3, which can be explained by a Ca-Al-Zn transformation mechanism converting volatile Zn to Ca3Al4ZnO10.
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DOI：
10.1115/1.3230269
发表时间：
1980-01-01
期刊：
JOURNAL OF ENGINEERING FOR POWER-TRANSACTIONS OF THE ASME
影响因子：
--
作者：
LEE, SHD;JOHNSON, I
通讯作者：
JOHNSON, I
影响因子：
1.9
作者：
M. O’Neil;Nicholas Niemiec;A. Demko;E. Petersen;W. Kulatilaka
通讯作者：
M. O’Neil;Nicholas Niemiec;A. Demko;E. Petersen;W. Kulatilaka
影响因子：
5.3
作者：
Yong He;Jiajian Zhu;Bo Li;Zhihua Wang;Zhongshan Li;M. Aldén;K. Cen
通讯作者：
Yong He;Jiajian Zhu;Bo Li;Zhihua Wang;Zhongshan Li;M. Aldén;K. Cen
影响因子：
4.4
作者：
P. V. Eyk;P. Ashman;Z. Alwahabi;G. Nathan
通讯作者：
P. V. Eyk;P. Ashman;Z. Alwahabi;G. Nathan
燃烧煤/生物质混合物中碱物质释放的特征
影响因子：
11.2
作者：
Liu Yingzu;He Yong;Wang Zhihua;Xia Jun;Wan Kaidi;Whiddon Ronald;Cen Kefa
通讯作者：
Cen Kefa