date: 2023-11-06T06:08:37Z pdf:PDFVersion: 1.7 pdf:docinfo:title: Characterization of Waste from the Dicalcium Phosphate Industry as a Potential Secondary Source of Rare Earth Elements "2279 xmp:CreatorTool: LaTeX with hyperref Keywords: fluorite sludge; REE; recycling access_permission:modify_annotations: true access_permission:can_print_degraded: true subject: Fluorite-rich sludge is the main waste from dicalcium phosphate (DCP) production. This sludge consists of 40?60% of CaF2, which precipitates during the reaction between fluorapatite (the main component of raw phosphorite material) and HCl. In addition, the sludge contains elevated amounts of critical elements such as REEs. In this study, two industrial sites producing DCP in Spain were studied to assess the potential valorization of these sludges. Currently, almost 2 Mt of waste remains landfilled in these sites. The concentrations of Y, La, Nd, Dy, and Gd found within the residues are about 1100 ppm, 450 ppm, 300 ppm, 80 ppm, and 75 ppm, respectively. Fluorite, being the host mineral of the REEs, occurs as very fine-grained spherules (<5 m) that are smaller than other minerals in the waste (quartz, gypsum), favoring the options of hydrometallurgical separation. REEs extraction from the fluorite could be an advantageous option, if separated from uranium, which is the main environmental concern of the future valorization of this kind of waste. dc:creator: Marcin P?achciak, Fidel Grandia, Vladimir Roddatis and Marcin Daniel Syczewski dcterms:created: 2023-11-06T04:18:19Z Last-Modified: 2023-11-06T06:08:37Z dcterms:modified: 2023-11-06T06:08:37Z dc:format: application/pdf; version=1.7 title: Characterization of Waste from the Dicalcium Phosphate Industry as a Potential Secondary Source of Rare Earth Elements "2279 Last-Save-Date: 2023-11-06T06:08:37Z pdf:docinfo:creator_tool: LaTeX with hyperref access_permission:fill_in_form: true pdf:docinfo:keywords: fluorite sludge; REE; recycling pdf:docinfo:modified: 2023-11-06T06:08:37Z meta:save-date: 2023-11-06T06:08:37Z pdf:encrypted: false dc:title: Characterization of Waste from the Dicalcium Phosphate Industry as a Potential Secondary Source of Rare Earth Elements "2279 modified: 2023-11-06T06:08:37Z cp:subject: Fluorite-rich sludge is the main waste from dicalcium phosphate (DCP) production. This sludge consists of 40?60% of CaF2, which precipitates during the reaction between fluorapatite (the main component of raw phosphorite material) and HCl. In addition, the sludge contains elevated amounts of critical elements such as REEs. In this study, two industrial sites producing DCP in Spain were studied to assess the potential valorization of these sludges. Currently, almost 2 Mt of waste remains landfilled in these sites. The concentrations of Y, La, Nd, Dy, and Gd found within the residues are about 1100 ppm, 450 ppm, 300 ppm, 80 ppm, and 75 ppm, respectively. Fluorite, being the host mineral of the REEs, occurs as very fine-grained spherules (<5 m) that are smaller than other minerals in the waste (quartz, gypsum), favoring the options of hydrometallurgical separation. REEs extraction from the fluorite could be an advantageous option, if separated from uranium, which is the main environmental concern of the future valorization of this kind of waste. pdf:docinfo:subject: Fluorite-rich sludge is the main waste from dicalcium phosphate (DCP) production. This sludge consists of 40?60% of CaF2, which precipitates during the reaction between fluorapatite (the main component of raw phosphorite material) and HCl. In addition, the sludge contains elevated amounts of critical elements such as REEs. In this study, two industrial sites producing DCP in Spain were studied to assess the potential valorization of these sludges. Currently, almost 2 Mt of waste remains landfilled in these sites. The concentrations of Y, La, Nd, Dy, and Gd found within the residues are about 1100 ppm, 450 ppm, 300 ppm, 80 ppm, and 75 ppm, respectively. Fluorite, being the host mineral of the REEs, occurs as very fine-grained spherules (<5 m) that are smaller than other minerals in the waste (quartz, gypsum), favoring the options of hydrometallurgical separation. REEs extraction from the fluorite could be an advantageous option, if separated from uranium, which is the main environmental concern of the future valorization of this kind of waste. Content-Type: application/pdf pdf:docinfo:creator: Marcin P?achciak, Fidel Grandia, Vladimir Roddatis and Marcin Daniel Syczewski X-Parsed-By: org.apache.tika.parser.DefaultParser creator: Marcin P?achciak, Fidel Grandia, Vladimir Roddatis and Marcin Daniel Syczewski meta:author: Marcin P?achciak, Fidel Grandia, Vladimir Roddatis and Marcin Daniel Syczewski dc:subject: fluorite sludge; REE; recycling meta:creation-date: 2023-11-06T04:18:19Z created: Mon Nov 06 05:18:19 CET 2023 access_permission:extract_for_accessibility: true access_permission:assemble_document: true xmpTPg:NPages: 13 Creation-Date: 2023-11-06T04:18:19Z access_permission:extract_content: true access_permission:can_print: true meta:keyword: fluorite sludge; REE; recycling Author: Marcin P?achciak, Fidel Grandia, Vladimir Roddatis and Marcin Daniel Syczewski producer: pdfTeX-1.40.21 access_permission:can_modify: true pdf:docinfo:producer: pdfTeX-1.40.21 pdf:docinfo:created: 2023-11-06T04:18:19Z