Evaluation of Mercury Form in Iron Ore through Sequential Leaching and Temperature-Programmed Heat Treatment Methods
Evaluation of Mercury Form in Iron Ore through Sequential Leaching and Temperature-Programmed Heat Treatment Methods
复制标题
通过顺序浸出和程序升温热处理方法评价铁矿石中的汞形态
DOI：
10.1016/j.fuel.2021.121953
复制
发表时间：
2022
期刊：
影响因子：
7.4
通讯作者：
Naoto Tsubouchi
中科院分区：
文献类型：
--
作者：
Javzandolgor Bud;Yuuki Mochizuki;Naoto Tsubouchi
为了弄清铁矿石加热过程中汞的演化规律，采用顺序浸出和程序升温相结合的方法，研究了铁矿石加热过程中汞的形态和挥发性汞的形态。印尼赤铁矿连续浸出组分的TPHT分析表明，水溶性汞由在低温和高温下演化的汞物种组成，至少鉴定出7种物种。其中一个物种可能是HgCl2，这是通过与模型化合物的TPHT结果进行比较而推断的。在300-600℃和500-850℃温度范围内，ACoH/HCl和KOH中的汞形态分别有两个演化峰。HNO_3可溶汞主要在750~850℃范围内挥发，HCl/HNO_3可溶汞在600~900℃范围内演化，至少由3种汞物种组成。根据上述各组分的TPHT数据，对5种铁矿石的汞挥发行为进行了曲线拟合，确定了所有样品中挥发到950℃以下的汞形态主要为水溶性汞。
In this study, to clarify the evolution of Hg during the heating process of iron ore, a combination of sequential leaching and temperature-programmed heat treatment (TPHT) was utilized to investigate the form of Hg in iron ore and volatile Hg species during heating. The TPHT of fractions obtained from the sequential leaching of Indonesian hematite revealed that the water-soluble Hg was composed of Hg species that evolved at both low and high temperatures and at least seven species were identified. One of these species may be HgCl2, which was inferred from comparisons to the TPHT results of model compounds. The Hg species leached in AcOH/HCl and KOH exhibited two evolution peaks in the temperature ranges of 300–600 °C and 500–850 °C, respectively. HNO3-soluble Hg species were mainly Hg volatilized in the range of 750–850 °C. HCl/HNO3-soluble Hg evolved in the range of 600–900 °C and consisted of at least three Hg species. Based on the information obtained through the TPHT of each the fractions mentioned above, the Hg evolution behaviors of five iron ores were curve-fitted and it was determined that the Hg species that volatilized up to 950 °C in all samples were mainly water-soluble Hg species.Synopsis:Elucidation of Hg morphology in iron ore and the evolution behavior is useful for controlling Hg release from ironmaking industry.