Separation of rare-earth metals and titanium in complex apatite concentrate processing

2020 ◽  
pp. 30-34
Author(s):  
O. V. Cheremisina ◽  
◽  
V. V. Sergeev ◽  
A. T. Fedorov ◽  
D. A. Alferova ◽  
...  
Keyword(s):  
Rare Earth ◽  
Organic Phase ◽  
Raw Materials ◽  
Rare Earth Metals ◽  
Economic Value ◽  
Russian Science ◽  
Mixing Rate ◽  
Apatite Concentrate ◽  
Process Solutions ◽  
Promising Source

Intermediate processing products of apatite raw materials, such as the process solutions of phosphoric acid (PA) containing the in-demand rare-earth elements (REE) of heavy and medium-light groups, are a promising source of rare-earth metals. Apatite concentrate typically has low rare-earth metals grades (up to 1 %); therefore, sufficient economic value may only be achieved with those technologies that yield individual rare-earth metals without modifications in the underlying apatite raw materials process. Extraction methods have significant technological advantages, mainly due to the simplicity of implementation and the possibility of accelerated industrial-scale adaptation. Rare-earth metals recovery from PA process solutions into the organic phase based on di-2-ethylhexylphosphoric acid (D2EHPA) is associated with the simultaneous extraction of titanium (IV). Additional separation processes are, therefore, required in view of the presence of titanium in the REE extract. It has been found that effective titanium recovery from the organic phase is achieved by using oxalic acid with the concentration of 0.25 mol/l at the phase ratio of 0.5 and the mixing rate of 400 min–1. The content of impurity elements in the concentrates of individual REM compounds obtained of does not exceed 10–4 %. The complex processing operations performed for obtaining individual rare-earth metals represent a complete technology for the integrated processing of apatite raw materials. The work was carried out with the financial support of the Russian Science Foundation (project No. 19-19-00377).

Secondary Resources of Rare Еarth Мetals

2020 ◽  
Vol 24 (9) ◽  
pp. 44-50
Author(s):  
S.A. Chernyi
Keyword(s):  
Rare Earth ◽  
Rare Earths ◽  
Industrial Waste ◽  
Rare Earth Metals ◽  
Nickel Metal ◽  
Nickel Metal Hydride ◽  
Processing Technologies ◽  
Apatite Concentrate ◽  
Fluorescent Lamps ◽  
High Processing

The article provides an overview of the main existing methods for recycling rare earth metals from various types of waste. It was noted that the demand for rare-earth metals is increasing annually due to the growth of advanced technologies, mainly in the sectors of electronics, power engineering and photonics. It has been established that in countries producing final products of high processing, the chemical-technological processes of processing goods that have worked out their life cycle, and, first of all, fluorescent lamps, NdFeB magnets from electronic devices, and nickel-metal hydride (NiMeH) batteries containing rare earths are most quickly created. The most profitable and recycling option is the reuse of products containing rare-earth metals, however, such technologies are applicable for a narrow range of waste. Another important area of REM recycling is the processing of industrial waste. For countries with developed mining and chemical industries, mining processing technologies are attractive. It is shown that for Russia, more appropriate are schemes for the disposal of industrial waste, primarily waste from the production of apatite concentrate. The main problems of the development of REM recycling are identified: low content and dispersion of rare earths in waste; the presence of impurities that impede the extraction of valuable components and the toxicity of the used recycling schemes.

scholarly journals Analysis of the use of rare earth metals in ferrous metallurgy of Russia and world

2020 ◽  
Vol 63 (6) ◽  
pp. 405-418
Author(s):  
A. I. Volkov ◽  
P. E. Stulov ◽  
L. I. Leont’ev ◽  
V. A. Uglov
Keyword(s):  
Rare Earth ◽  
Cast Iron ◽  
Ferrous Metallurgy ◽  
Raw Materials ◽  
Rare Earth Metals ◽  
Calculated Data ◽  
Iron And Steel ◽  
The World ◽  
Steel Alloying ◽  
Former Ussr

The analysis of the current state of production of rare earth metals (REM) in Russia and in the world was made. Information about REM production in different countries of the world and about new foreign projects for REM production and processing is provided. The article presents the balance of production, export and import of raw materials and products with REM, including scandium and yttrium, in Russia. The maximum volume of REM consumption in Russia was calculated taking into account imported products with REM. This data was compared with other countries, including the former USSR. Much attention is paid to the use of REM in metallurgy. Data on the influence of REM on the properties of cast iron and steel are presented. Information is given about the forms of REM used for their use in the Russian ferrous metallurgy. We have studied the structure of REM consumption in ferrous and non-ferrous metallurgy. On the example of two enterprises (one of them specializes in mass production, and the second – on production of special steels), the structure of REM consumption for steel alloying was studied by type and scope of its application. The development peculiarities of REM consumption in Russian ferrous metallurgy were investigated. The volume of consumption was calculated; data on imports of raw materials with REM for metallurgy and the producers of ferroalloys with REM in Russia is given. We have analyzed the spectrum of steel products with REM. A comparison of the consumption of REM in the metallurgy of Russia and foreign countries is presented. The reasons for insufficient consumption of REM in the Russian metallurgy are considered, an assessment is given on the change in production volumes of certain types of steel and cast iron, and recommendations are made on the growth of REM consumption in metallurgy.

scholarly journals Development of methods for the recovery оf rare-earth elements from the mineral resources of the Arctic

2021 ◽  
Author(s):  
E. P. Lokshin ◽  
◽  
O. A. Tareeva ◽  
◽  
◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Raw Materials ◽  
Mineral Resources ◽  
The Arctic ◽  
Resource Saving ◽  
Apatite Concentrate ◽  
Naturally Occurring ◽  
Wide Range ◽  
Rare Earth Mineral

This paper summarizes the findings of the research aimed at the development of a new method for the integrated processing of naturally occurring and anthropogenic rare-earth raw materials based on the decomposition of rare-earth element (REE) concentrates in the presence of sulfocationite. Sorption and desorption of REE cations on a strongly acidic ion exchanger, sorbent regeneration, and REE recovery from eluates are discussed. A virtually zero-waste integrated process for apatite concentrate is proposed. The generalization of the research findings is aimed at demonstrating the prospects and universality of the proposed resource-saving and environmentally safe approach to the processing of various types of naturally occurring and anthropogenic rare-earth mineral feeds. The new methodology made it possible to develop a number of new hydrochemical processes united by a single approach, providing a qualitative increase in the processing performance of various types of rare-earth mineral feeds. The theoretical foundations of a unified approach to the processing of a wide range of minerals can significantly accelerate and cheapen the implementation of specific process circuits, significantly reduce reagent consumption and waste generation, simplify the separation of rare earth elements and impurities, and the separation of rare earth elements from naturally occurring radionuclides, fluorine, and phosphorus. The study was funded by the Kolarctic CBC 2014-2020 program, Project KO1030 SEESIMA — Supporting Environmental Economic and Social Impacts of Mining Activity.

Raw material composition at Rusal Achinsk and its impact on the production indicators

2020 ◽  
pp. 27-34
Author(s):  
D. G. Chistyakov ◽  
◽  
V. O. Golubev ◽  
V. M. Sizyakov ◽  
V. N. Brichkin ◽  
...  
Keyword(s):  
Production Process ◽  
Raw Materials ◽  
Main Tool ◽  
Operating Conditions ◽  
Material Composition ◽  
Potassium Sulfate ◽  
Raw Material ◽  
Russian Science ◽  
Feed Material ◽  
Process Solutions

It is well known that an unstable composition of ore and auxiliary materials creates the need to manage material flows and their composition in order to ensure the required productivity and achieve the desired qualitative and quantitative characteristics of the final products. The above problem was decided to find a solution for through analysis and mathematical processing of the RUSAL Achinsk database containing data on the incoming nepheline ore and limestone. Thus, one could analyze variations in the ore composition and carry out a statistical analysis by calculating the root-mean-square (standard) deviation and the variation coefficient. A digital model of the alumina and soda product production process employed by RUSAL Achinsk was used as the main tool for calculating production indicators as a function of the raw material composition. The model was built by RUSAL ETC on the basis of lumped parameters modelling. It is shown that the chemical composition of the raw materials supplied to RUSAL Achinsk and their variability in the current operating conditions of the Kiya-Shaltyr nepheline mine and Mazoul limestone mine have a significant impact on the alumina and by-product production process and some adjustment of the process flows is required. It was estimated how the output and the consumption of soda-sulfate mixture and potash are likely to change depending on the concentration of Al2O3, K2O, Na2O and SO3 in the feed material. Based on the obtained results, one can identify the most innovative process solutions that would enable to raise the output of by-products while maintaining the output of alumina due to the introduction of appropriate corrective ingredients. In this case, the output of potassium sulfate is expected to rise from 1.22 to 5.78%, and that of soda ash — from 1.27 to 6.5%, which determines a significant increase in profit for these two products. This research study was funded by the Russian Science Foundation under the Grant Agreement No. 18-19-00577 dated 26th April 2018 on fundamental scien tific research and exploratory scientific research.

scholarly journals The Recovery of Yttrium and Europium Compounds from Waste Materials

2013 ◽  
Vol 39 (3) ◽  
pp. 107-114 ◽  
Author(s):  
Stefan Góralczyk ◽  
Elżbieta Uzunow
Keyword(s):  
Rare Earth ◽  
Raw Materials ◽  
Electronic Waste ◽  
Rare Earth Metals ◽  
High Technology ◽  
Hazardous Substances ◽  
Waste Materials ◽  
Test Results ◽  
Secondary Materials ◽  
Critical Raw Materials

Abstract Rare earth metals including yttrium and europium are one of several critical raw materials, the use of which ensures the development of the so-called high technology. The possibility of their recovery in Europe is limited practically only to secondary materials such as phosphogypsum and electronic waste. The article presents the results of our research concerning the development of recovery technology of yttrium and europium from luminophore CRT used lamps. It describes the principle of separation of elements and the test results of cleaning the concentrate. It was shown that the costs of preparing the concentrate according to the proposed technology are lower than the phosphogypsum processing technology and the composition of the resulting product does not contain hazardous substances.

scholarly journals Concentration and Separation of Heavy Rare-Earth Metals at Stripping Stage

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1317
Author(s):  
Olga Cheremisina ◽  
Vasiliy Sergeev ◽  
Alexander Fedorov ◽  
Daria Alferova
Keyword(s):  
Rare Earth ◽  
Oxalic Acid ◽  
Organic Phase ◽  
Tributyl Phosphate ◽  
Rare Earth Metals ◽  
Earth Metal ◽  
Acid Solutions ◽  
Extractant Concentration ◽  
Heavy Rare Earth ◽  
Separation Factors

The separation and concentration processes of heavy rare-earth metals—yttrium, ytterbium, erbium, and dysprosium—during stripping from the organic phase based on di-2-ethylhexylphosphoric acid (D2EHPA, or DEHPA) solutions were investigated in this work. Optimal conditions providing high separation factors of rare-earth metals (REM) and their extraction degree to the aqueous phase were determined. The usage of sulfuric acid solutions with a concentration of 2–6 mol/L, depending on the type of extracted rare-earth element, was proposed as a stripping agent for rare-earth metals (REM), and the usage of oxalic acid solution was proposed as an iron stripping solution from the organic phase. To increase the REM stripping efficiency, the antagonistic effect of tributyl phosphate in the di-2-ethylhexylphosphoric acid-kerosene-tributyl phosphate system was considered. The possibility of increasing the capacity of the organic solvent by cleaning the organic phase from iron ions using oxalic acid solutions was revealed. The influence of temperature, aqueous and organic phase ratio, stirring rate, and re-extractant concentration on the distribution and separation factors of adjacent heavy rare-earth-metal (HREM) pairs during the re-extraction process were determined. A schematic diagram of the laboratory-tested separation process of heavy rare-earth metals into individual components with the obtaining of yttrium and ytterbium concentrates containing more than 99% of the target components was proposed.

Associated recovery of heavy rare-earth metals in the processing of phosphate raw materials

2019 ◽  
pp. 29-35
Author(s):  
O. V. Cheremisina ◽  
◽  
V. V. Sergeev ◽  
A. T. Fedorov ◽  
E. S. Lukyantseva ◽  
...  
Keyword(s):  
Rare Earth ◽  
Raw Materials ◽  
Rare Earth Metals ◽  
Heavy Rare Earth

Rare earth metals sorption recovery from uranium in situ leaching process solutions

Rare Metals ◽  
2014 ◽  
Vol 34 (3) ◽  
pp. 195-201 ◽  
Author(s):  
N. M. Shokobayev ◽  
C. Bouffier ◽  
T. S. Dauletbakov
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Leaching Process ◽  
Uranium In Situ Leaching ◽  
Sorption Recovery ◽  
Process Solutions

The role of curvature effects in liquid–liquid extraction: assessing organic phase mesoscopic properties from MD simulations

Soft Matter ◽  
2017 ◽  
Vol 13 (33) ◽  
pp. 5518-5526 ◽  
Author(s):  
Magali Duvail ◽  
Steven van Damme ◽  
Philippe Guilbaud ◽  
Yushu Chen ◽  
Thomas Zemb ◽  
...  
Keyword(s):  
Rare Earth ◽  
Organic Phase ◽  
Reverse Micelles ◽  
Rare Earth Metals ◽  
Md Simulations ◽  
Liquid Extraction ◽  
Molecular Approach ◽  
Curvature Effects ◽  
Liquid Liquid Extraction

A molecular approach for investigating the role of chain configurations of reverse micelles containing rare-earth metals involved in liquid–liquid extraction.

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