Examination of metal sorting and concentration technology in landfill mining -with focus on gravity and magnetic force sorting-
Examination of metal sorting and concentration technology in landfill mining -with focus on gravity and magnetic force sorting-
复制标题
垃圾填埋场采矿中金属分选和浓缩技术的研究-以重力和磁力分选为重点-
DOI：
10.1016/j.wasman.2022.01.008
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发表时间：
2022
期刊：
影响因子：
8.1
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Kamura;K.;Makita;R.;Uchiyama;R.;Tanaka;H.
该研究的重点是废物填埋场中所含微量金属的回收。我们之前报道过调查垃圾填埋场中每种元素现有化学形态，为特定元素创建高浓度区，并无损地探索该元素在块内位置的方法。在这项研究中，使用从浓缩区采集的样品，检查了一种从垃圾填埋场浓缩有用金属的方法。具体而言，利用从主要由焚烧炉灰组成的垃圾填埋场收集的样品来检验利用重力和磁力进行物理分选的效率。在重力分选方法中，当重液比重为2.5或2.75g/cm3及以上时，所得金属浓度较高。目前，使用比重为2.75-3.0 g/cm3的重液进行分选对于提高样品的金属浓度是有效的。磁力分选可以有效地分离金属和非金属，并且作为更高级浓缩阶段的预处理是有效的。填埋废物中混合有各种物质，需要经过多个阶段的分选和浓缩处理才能提取有用的微量金属。物理分选方法，例如使用重力或磁力，对于初始阶段处理是有效的。此外，当待提取的金属确定后，针对这些预处理的样品，将进一步研究基于目标金属的化学形态和特性的更有效的浓缩方法。
The study focuses on the recovery of the minor metals contained in waste landfills. We have previously reported on the method of investigating the existing chemical morphology of each element in landfills, creating a high-concentration zone for a specific element, and non-destructively exploring the position of that within the block. In this study, a method for concentrating useful metals from landfills was examined, using samples taken from a concentrated zone. Specifically, the efficiency of physical sorting using gravity and a magnetic force was examined with samples collected from landfills mainly composed of incinerator ash.In the gravity sorting method, the resulting metal concentration is large when the heavy liquid specific gravity is 2.5 or 2.75 g/cm3and above. Currently, sorting using a heavy liquid with a specific gravity of 2.75–3.0 g/cm3is effective for increasing the metal concentration of the sample. Magnetic force sorting can efficiently separate metals and non-metals, and is effective as a pretreatment for a more advanced concentration stage.Various substances are mixed within the landfill waste, and several stages of sorting and concentration treatments are required to extract useful minor metals. A physical sorting method, such as the use of gravity or magnetic force is effective for the initial stage processing. Furthermore, when the metal to be extracted has been determined, a more effective concentration method based on the chemical form and characteristics of the target metal will be further examined for these pretreated samples.