Leaching kinetics study of neodymium from the scrap magnet using acetic acid

Behera, Saroj Sekhar; Parhi, Pankaj Kumar

doi:10.1016/j.seppur.2016.01.014

Cited by 123 publications

(49 citation statements)

References 40 publications

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“…From this figure, it can be concluded that all metals are dissolved in 7 hours except nickel which is stable and can thus be recovered in the solid phase after filtration of the solution. The dissolution rate is consistent with the literature [5][6][7]. It is important to note that this result is under processing of patent.…”

Section: Extraction Of Ree Using Innovative Hydrometallurgical Technisupporting

confidence: 91%

Process Recovery of Nd-Fe-B Permanent Magnets from Hard Disc Drives

Menad¹,

Seron²,

Maat³

2016

J Geogr Nat Disast

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The increasing use of rare earths elements (REE) in a number of recent technological innovations led to a rapid increase (>50% in last decade) in their applications. Besides, Europe is one of the most important regions of consumption of these substances. In this context, in its 'Raw materials' strategy, Europe puts the recycling at the centre of its concerns to secure its supplies in REEs. Recycling of these substances, on an industrial scale, remains somewhat developed while it presents numerous advantages over the exploitation of primary resources. Thus, in order to increase the efficiency of the use of the REEs and to decrease European dependence on these strategic elements, research and development efforts must be achieved in all areas of their life cycle whether it concerns exploitation of ores or end-of-life equipment such as the one. This paper shows the results obtained the work done in the frame of the EXTRADE project on the extraction of the Nd-Fe-B permanent magnets from the WEEE deposit, developing units operation of treatment of WEEE intended to retrieve the contents of the magnet type Nd-Fe-B and to develop thermal, physical and physico-chemical treatments for producing new magnets or fractions enriched in alloys of REEs compatible with a recycling in the hydrometallurgical production of REE.

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Section: Extraction Of Ree Using Innovative Hydrometallurgical Technisupporting

confidence: 91%

Process Recovery of Nd-Fe-B Permanent Magnets from Hard Disc Drives

Menad¹,

Seron²,

Maat³

2016

J Geogr Nat Disast

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“…After calcination, the sample was milled to different particle sizes ranged from 1.0 -0.71; 0.71 -0.5; 0.5 -0.25; 0.25 -0.09 and < 0,09 mm [10] by ball mill and rotary mill machines.…”

Section: Experiments and Methodsmentioning

confidence: 99%

RECOVERING RARE EARTH OXIDE FROM NdFeB MAGNET OF WASTE HDDs BY LEACHING AND SELECTIVE PRECIPITATION METHODS

Huy¹

2018

JST

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Rare earth metal elements have been used widely in many different fields such as in fluorescence, polishing powder, nuclear, laser applications, fiber optics, superconductors, permanent magnets, capacitors and radar technology, etc. In recent years, the development and demand trend led to a large amount of electric and electronic waste (e-waste) generated annually. Faced with issues of shortage on using demand of rare earth metal, many studies have been done in order to recover, recycle and reuse this metal from e-waste. In this research, rare earth elements were recovered from permanent magnet which was dismantled from some kinds of waste hard disk drives HDDs.Result of reseach showed that magnetic flux density of the NdFeB magnet was eliminated completely at 300 ºC in one hour. The leaching efficiency of magnet powder sample reached 99.4 % after 10 min reaction in H 2 SO 4 acid have concentration > 0.3 M under the leaching conditions: stirring speed of 200 rpm, particle size < 0.25 mm, solid/liquid (S/L) ratio 20 g/1l and temperature reaction is 25 ºC. Total rare earth metal elements can be recovered by the using selective crystallization and precipitation method in leaching solution by Na 2 SO 4 and oxalic acid up to 98.36 % was with purity up to 94.32 %. Nd 2 (C 2 O 4 ) transformed into Nd 2 O 3 after being calcinated at 700 C.

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“…Penggunaan jenis asam ini dinilai masih memiliki beberapa kelemahan diantaranya menghasilkan gas berbahaya bagi lingkungan dan limbahnya tidak ramah terhadap lingkungan. Asam asetat digunakan sebagai pelindi dikarenakan sifatnya lebih ramah lingkungan (gas emisi lebih rendah dan lebih mudah terdegradasi oleh alam dibandingkan dengan asam anorganik) dan sudah terbukti dapat digunakan untuk mengekstraksi Nd (Behera dan Parhi, 2016).…”

Section: Pendahuluan *unclassified

“…Nilai konstanta kecepatan reaksi nyata untuk reaksi pelindian (kap) dapat dicari berdasarkan grafik dari Persamaan (5) atau (6) atau (7), yang dipilih dari hasil kecocokan model persamaan dengan data percobaan yang telah dilakukan pada langkah sebelumnya. Energi aktivasi (E) dapat dicari berdasarkan grafik dari Persamaan (9) yang menggambarkan hubungan ln kap dengan (1/T) (Behera dan Parhi, 2016).…”

Section: Pemilihan Model Dan Perhitungan Parameter Kinetikaunclassified

Pelindian Neodymium dari Magnetik Coal Fly Ash menggunakan Asam Asetat sebagai Pelarut

handoyo¹,

Bendiyasa

Prasetya

2019

Eksergi

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ABSTRAK: Neodymium (Nd) telah dikenal sebagai komponen penting dalam industri modern diantaranya sebagai magnet permanen (magnet NdFeB). Beberapa negara kini mulai mencari sumber alternatif Nd yang salah satunya adalah abu terbang batubara, yang merupakan hasil dari pembakaran batubara sebagai sumber energi listrik. Penelitian ini bertujuan untuk mempelajari pelindian Nd dari abu terbang batubara menggunakan asam asetat sebagai pelarut pada kondisi atmosferik. Pada penelitian ini dipelajari pengaruh konsentrasi asam asetat (0,1-1,0 N) dan pengaruh suhu pelindian (26-60 o C). Beberapa kondisi percobaan yang dijaga tetap yaitu kecepatan pengadukan (400 rpm), rasio S/L (3,75 % W/V) dan ukuran partikel (-400 mesh). Hasil pelindian tertinggi (72 %) diperoleh pada konsentrasi asam asetat 0,5 N pada 60 o C. Hasil percobaan menunjukkan pelindian Nd dari magnetik CFA menggunakan asam asetat mengikuti model shringking core yang dikontrol oleh difusi lapisan abu: [t.kap=1-3(1-XB) 2/3 +2(1-XB)], dengan energi aktivasi sebesar 15,38 kJ/mol. Kata Kunci: neodymium; pelindian; magnetik CFA; asam asetat.

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Leaching kinetics study of neodymium from the scrap magnet using acetic acid

Cited by 123 publications

References 40 publications

Process Recovery of Nd-Fe-B Permanent Magnets from Hard Disc Drives

Process Recovery of Nd-Fe-B Permanent Magnets from Hard Disc Drives

RECOVERING RARE EARTH OXIDE FROM NdFeB MAGNET OF WASTE HDDs BY LEACHING AND SELECTIVE PRECIPITATION METHODS

Pelindian Neodymium dari Magnetik Coal Fly Ash menggunakan Asam Asetat sebagai Pelarut

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