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Extraction and Production of Rare Earth Elements from Coal-Seam Bedrock and Caprock

机译：煤层基岩和脚轮稀土元素的提取与生产

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Rare earth elements (REE) required in modern technological products are found in shale rocks above and below coal seams. Often during the process of mining coal, shale rock adjacent to the seam inadvertently is removed then diverted to landfill sites. Ecologically sound and potentially economic methods of extracting the REEs from these landfills are proposed. Methods include utilizing geomemembrane barrier beneath the landfill site, ion exchanging with moderate pH, slightly acidic, sodium chloride solutions. Sodium hydroxide is utilized to precipitate the REE-hydroxides subsequently converted to REE-chlorides with suitable amount of hydrochloric acid. All acid and base streams are co-produced with efficient membrane/electrolysis technology. Concentrated-REE chlorides are transported to centralized solvent extraction facilities for isolation and purification. Solvent extraction processes also employ the methodology of using co-produced acid/base streams. This paper details minimization of environmental impacts and maximizing economics to produce valuable REEs while increasing the economics of coal mining.
机译：现代技术产品所需的稀土元素（REE）在煤层上方和下方的页岩岩石中发现。通常在采矿煤的过程中，除去与接缝相邻的页岩岩体被移除，然后转移到垃圾填埋场。提出了从这些垃圾填埋场中提取REES的生态声音和潜在的经济方法。方法包括利用垃圾填埋场下面的地质膜屏障，以中等pH，微酸性，氯化钠溶液离子交换。利用氢氧化钠沉淀出随后转化为具有合适量的盐酸的REE-氯化物的REE氢氧化物。所有酸和碱流都是用有效膜/电解技术共制的。浓缩氯化物被运输到集中溶剂萃取设施，以分离和纯化。溶剂萃取过程还采用使用共产生的酸/碱物流的方法。本文详细说明了环境影响最小化，最大化经济学在增加煤炭开采经济的同时生产有价值的重新。

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