Prospective recovery of rare earth elements from waste

The problem of the complex use of mineral raw materials is significant in the context of many industries. In the rare earth industry, in the context of limited traditional domestic reserves and dependence on imports of lanthanides, an unambiguous and comprehensive solution has not yet been developed. Promising areas include the involvement of technogenic raw materials in the industrial turnover. The present study examines the kinetics of the dissolution process of poorly soluble lanthanide compounds when changing the parameters of the system. The results obtained reflect the dependence of the degree of extraction of lanthanide on the following variable parameters of the system: temperature, concentration of the complexing agent, and intensity of mixing. On the basis of the experiment, the values of the activation energy and the reaction orders were calculated. The activation energy of the carbonate dissolution process, in kJ/mol, was as follows: 61.6 for cerium, 39.9 for neodymium, 45.4 for ytterbium. The apparent reaction orders of the carbonates are equal to one. The prospect of using the research results lies in the potential to create a mathematical model of the process of extracting a rare earth metal by the carbonate alkaline method.

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“…Part of the study is performed in Ref. [33]. Precipitation dissolution is carried out in chemically pure potassium carbonate.…”

Section: Methodsmentioning

confidence: 99%

The Kinetic Aspects of the Dissolution of Slightly Soluble Lanthanoid Carbonates

Литвинова

Kashurin

Zhadovskiy

et al. 2021

Metals

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“…The extraction of rare earth elements from phosphogypsum is worth mentioning separately. In works [18][19][20] methods of rare earth elements (REE) extraction from anthropogenic raw materials, including phosphogypsum, are considered. This kind of processing could solve the problem with environmental load and REE production.…”

Section: Introductionmentioning

confidence: 99%

Influence of Impurities on the Process of Obtaining Calcium Carbonate during the Processing of Phosphogypsum

et al. 2022

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The article is devoted to the study of the influence of residual sulfuric and phosphoric acids on the process of processing large-tonnage phosphogypsum (PG) waste into calcium carbonate. In the Russian Federation, about 10 percent of existing phosphogypsum waste is processed into construction materials. Acidic impurities (phosphoric and sulfuric acids) in their composition are an obstacle to the use of phosphogypsum for the production of binders. This study finds that impurities also reduce the chemical activity of phosphogypsum. At the same time, the paper focuses on the potential of phosphogypsum for the production of calcium carbonate. This article investigated the amount of impurities in phosphogypsum. The results show that during automatic washing of phosphogypsum, losses are approximately 30–35 wt. %. It was also found that phosphogypsum by 22% consists of impurities of phosphoric and sulfuric acid. These acids are characteristic waste products of extraction phosphoric acid (EPA) production. By ASTM C471M-20ae1, the content of calcium sulfate dehydrate and hemihydrate before and after washing was determined. A thermodynamic calculation of the proposed interaction of phosphogypsum with carbonates showed that the characteristic reaction is possible. The conversion process of phosphogypsum to get the corresponding calcium carbonate was carried out at 70 °C. Data on the chemical composition of the reaction products, obtained by X-ray fluorescence analysis on a Shimadzu EDX-7000 spectrometer, showed that some reactions proceed incompletely and need the selection of optimal conditions. The potential commercial benefits of processing phosphogypsum by carbonization were defined for products such as calcium carbonate or its derivatives.

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Prospective recovery of rare earth elements from waste

Cited by 2 publications

References 7 publications

The Kinetic Aspects of the Dissolution of Slightly Soluble Lanthanoid Carbonates

The Kinetic Aspects of the Dissolution of Slightly Soluble Lanthanoid Carbonates

Influence of Impurities on the Process of Obtaining Calcium Carbonate during the Processing of Phosphogypsum

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