In selected condition, apatite was dissolved in 20% (v/v) nitric acid solution at 60–70 °C while agitating. The most suitable acidity for extraction is 0.4 M HNO 3. More than 98% of rare earths in apatite can be recovered using countercurrent extraction process with six stages when phase ratio = 0.5, and
Raw sewage sludge from East Rand Water Care Association (ERWAT) had high phosphorus (P) content, approximately 15.2% (w/w) P 2 O 5, which indicates a potential resource for the limiting nutrient.Leaching sewage sludge with 1 M sulphuric acid at 5% solid loading for 2 h resulted in an 82% phosphorus extraction.However, the …
Since apatite concentrate and hence industrial phosphoric acid solutions are characte- rized by extremely low amounts of REE, the extraction is the main method for their …
Extraction of 85% light REEs and over 89% heavy REEs was achieved when the extraction was performed with a 1.2 mol/dm 3 D2EHPA (di-2-ethylhexylphosphoric acid) solution from the solution obtained by dissolving apatite in a 1 mol/dm 3 sulfuric acid solution. For re-extraction, a 3 mol/dm 3 sulfuric acid solution …
The extraction of Blue Apatite involves both small-scale and larger industrial operations. Methods include open-pit mining and underground mining, depending on the depth and concentration of the deposits. In Madagascar, for instance, many miners still use traditional methods, which can be labor-intensive. ...
Apatite is mined extensively for many uses, but approximately 90% of mined apatite is used to produce fertilizers and animal feed; the P extracted from apatite is essential for …
Nitric, sulfuric, and hydrochloric acids have been used as leaching agents for the extraction of rare earth elements from apatite. When apatite is leached with HNO 3, all the rare earths substituted in the apatite lattice for calcium ions are dissolved, and several processes are available to recover them from the pregnant leach liquor ( Li et ...
In this study, the various organic extractants, namely D2EHPA, PC-88A, TBP, TBPP, TOA, and TOPO, were examined to extract REEs from sulphuric acid leach liquor of apatite ore. Extraction ...
In addition, a small amount of limonite was wrapped with apatite. To strengthen the iron mineral extraction, a multi-stage grinding process is very necessary. Increasing further iron mineral and phosphorus mineral liberation degrees is the key to improving separation effects. Download : Download high-res image (666KB)
extraction process in the range from 1.0-11.0 M with 1.18 M CYANEX 923 at O/A = 2/1 and 25 °C was investigated. The results show that the extraction increased with increasing
This paper presents the results of laboratory studies for the recovery of rare earth elements from an apatite ore sample by using sulphuric acid leaching, solvent …
Apatite ore samples obtained from Mushgia Khudag, Mongolia were used in this study. Reagent grade sulphuric, nitric and hydrochloric acids were used to dissolve REEs from the apatite ore sample. ... The extraction of valuable elements from the residue has a great impact on the sustainable utilization of rare-earth resources. In this study, a ...
Abstract The industrially important rare-earth elements (REE) are contained in pronounced quantities (up to 1 wt %) in the apatite of the Kola Peninsula, which dictates interest in their extraction. The extraction of rare-earth elements with tributyl phosphate from solutions obtained by dissolving the phosphate concentrate of REE …
A new process is proposed to recover rare earths from apatite without interfering with the normal route for fertilizer production using solvent extraction with P 350. Mixed rare earth oxides (REO) of which purity is more than 95% with yield over 98% can …
The extraction efficiency of uranium with 0.01 mol dm −3 HPMTFP at pH 2 decreased remarkably in accordance with the increase of apatite. The extraction efficiency of uranium is not satisfactory with 0.05 mol dm −3 HPMTFP. Consequently, uranium was extracted three times. The extraction of thorium was quantitative with 0.05 mol dm −3 …
Bones were cooked in water for two to three hours to facilitate the extraction of bone marrow and tendons [35][36][37].To denature the protein, the bone fragments were dried in an oven at 80 • C ...
Apatite is the most common phosphate mineral, and is the main source of the phosphorus required by plants. The bones and teeth of most animals, including humans, are composed of calcium phosphate, which is the same material as Apatite. (These biological Apatites are almost exclusively the Hydroxylapatite type.) Chemical Formula.
The many facets of apatite JOHN M. HUGHES Department of Geology, University of Vermont, Burlington, VT 05405, U.S.A. Abstract In the past 150 years, with the discovery of petroleum and the invention of the gasoline-powered internal combustion engine, the rate of extraction of minerals from the Earth has made
Solvent extraction of rare earths from nitrate leach liquor of apatite using mixtures of tributyl phosphate (TBP) and di-(2-ethylhexyl) phosphoric acid (D2EHPA) was studied. The effects of nitrate and hydrogen ion concentration of the aqueous phase as well as the composition and concentration of extractants in the organic phase on the ...
Solvent extraction of rare earths from nitrate leach liquor of apatite using mixtures of tributyl phosphate (TBP) and di-(2-ethylhexyl) phosphoric acid (D2EHPA) was studied. The effects of nitrate and hydrogen ion concentration of the aqueous phase as well as the composition and concentration of extractants in the organic phase on the …
1. Puri cation of Crude Phosphoric Acid and Leached Apatite by Solvent Extraction ... Abstract. CYANEX 923 (a mixtur e of four trialkylphosphine oxides) in. kerosene has been used for the ...
The apatite iron ores in the Kiruna area are dominated by either Magnetite or Ha ematite and contain. varying amounts of apatite giving them a content of Fe and P, which varies between 30-70 % and ...
In this paper, a new process is proposed to recover rare earths from nitric acid leaching of apatite without interfering with the normal route for fertilizer production …
The present study is devoted to the extraction of rare-earth metals (REMs) from a high-silica ore found in one of the deposits in Kazakhstan. The total content of rare-earth elements (REE) in the ...
Deposits of apatite iron ores are the major source for iron in the European Union and are exploited by LKAB in several mines in the Kiruna area in northern Sweden, which is an …
@article{Battsengel2018RecoveryOL, title={Recovery of light and heavy rare earth elements from apatite ore using sulphuric acid leaching, solvent extraction and precipitation}, author={Ariuntuya Battsengel and Altansukh Batnasan and Ariunbolor Narankhuu and Kazutoshi Haga and Yasushi Watanabe and Atsushi Shibayama}, …
The effect of the extraction process and bio-waste source on the physicochemical characteristics of the nHAp such as Ca/P ratio, functional groups, crystallinity and phase change, and surface ...
In this paper, a new process is proposed to recover rare earths from nitric acid leaching of apatite without interfering with the normal route for fertilizer production using solvent extraction with dimethyl heptyl methyl phosphonate CH 3 P(O)(OC 8 H 17) 2 (P 350, B).In the present work, the leaching conditions are studied.
According to the results of the sequential extraction method, most of the apatite (70%) in the HBEF soil parent material is located along grain boundaries or mineral fractures and is thus available to weathering solutions. The remaining 30% of apatite in HBEF soil parent material is armored by weathering-resistant minerals and appears to …
The purpose of this study was to evaluate the feasibility of using apatite blocks fabricated by a dissolution⁻precipitation reaction of preset gypsum, with or without statin, to enhance bone formation during socket healing after tooth extraction. Preset gypsum blocks were immersed in a Na₃PO₄ aqueou …
1. Introduction. Biological apatite is an inorganic calcium phosphate salt (CaPs) in apatite form with a biological derivation. As the main inorganic component of both bones and teeth, it is distributed in the organic constituents with certain sequence and direction [].By serving as the fillers in such biological tissues, biological apatite is critical …
Rare earth metals (REM) after sulfuric acid treatment of apatite ore are partly (15–20%) transferred into extraction phosphoric acid (EPA) solution. Solvent extraction …
A Review of Rare-Earth Elements Extraction with Emphasis ... Tailings, Apatite, and Phosphate Byproducts Meisam Peiravi1 & Fahimeh Dehghani2 & Louis Ackah3 & Azam Baharlouei1,4 & Justin Godbold5 & Jia Liu1 & Manoj Mohanty6 & Tathagata Ghosh2 Received: 11 March 2020/Accepted: 11 September 2020 # Society for Mining, …
