Method and system for supercritical fluid extraction of metal

A supercritical fluid, metal technology, applied in the process of supercritical conditions, solid solvent extraction, preparation/processing of rare earth metal compounds, etc., can solve problems such as difficulty in dissolution

Inactive Publication Date: 2020-12-11
THE GOVERNING COUNCIL OF THE UNIV OF TORONTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

red phosphor (i.e. Y 2 o 3 :Eu 3+ ) is easily dissolved by dilute acid, but other phosphors, mainly green phosphors (ie LaPO 4 : Ce 3+ , Tb 3+ (LAP), (Gd,Mg)B 5 o 12 : Ce 3+ , Tb 3+ (CBT), (Ce,Tb)MgAl 11 o 19 (CAT)) are very difficult to dissolve because of their high acid resistance

Method used

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  • Method and system for supercritical fluid extraction of metal
  • Method and system for supercritical fluid extraction of metal
  • Method and system for supercritical fluid extraction of metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0087] Preferred Embodiment 1: Extraction of Rare Earth Elements from Hybrid Electric Vehicle Batteries

[0088] The present invention relates to the development of an efficient and sustainable process for the urban mining of rare earth elements from waste electrical and electronic equipment, such as nickel metal hydride batteries. In a preferred embodiment, the developed process relies on the utilization of CO 2 Supercritical fluid extraction as a solvent that is inert, safe and abundant. The process is efficient in the sense that it operates safely, at low temperatures, produces no hazardous waste, and preferably recovers up to about 90% of the rare earth elements.

[0089] Furthermore, the present invention provides a mechanism for supercritical fluid extraction of rare earth elements in which the trivalent rare earth element state bonded to three tri-n-butyl phosphate (TBP) molecules and three nitrates is considered for the extracted Model of the rare earth tri-n-butyl...

Embodiment approach 2

[0148] Preferred embodiment 2: Extraction of rare earth elements from permanent magnets

[0149] As mentioned above, the present invention relates to efficient and sustainable development for urban mining of REE from WEEE. Besides NiMH batteries, another potential source of REEs are permanent magnets that can be found in, for example, computer hard drives and wind turbines. Accordingly, another preferred embodiment of the present invention involves supercritical fluid extraction of metals, such as rare earth elements, from permanent magnets.

[0150] Experimental part of preferred embodiment 2

[0151] Chemicals and materials. The following reagents were used: Tri-n-butyl phosphate (TBP, ≥98% – from VWR TM ), concentrated nitric acid (15.7M, 70wt%–VWR TM ), concentrated hydrochloric acid (12.2M, 37wt%–VWR TM ), concentrated sodium hydroxide (19.4M, 50wt%–VWR TM ), phenolphthalein indicator solution (1% alcohol solution – VWR TM ), neodymium oxide (Nd 2 o 3 , 99.9 wt%...

Embodiment approach 3

[0216] Preferred Embodiment 3: Extraction of Rare Earth Elements from Phosphors

[0217] In yet another preferred embodiment, the source is a phosphor and the target metal is one or more rare earth elements.

[0218] Experimental part of preferred embodiment 3

[0219] The feasibility of supercritical fluid extraction of rare earth elements (strontium (Sr) and antimony (Sb)) was evaluated in a series of extraction experiments. The feedstock used for these experiments was pre-separated fluorescent bulb (FL) luminescent material from a fluorescent lamp recycling facility.

[0220] Characterization of FL luminescent materials. The physical and chemical properties of the starting luminescent materials were characterized prior to extraction experiments. The starting material is a powder corresponding to the inner coating of scrap FL. Particle size distribution determined by laser particle size analysis, such as Figure 19 shown in . A trimodal distribution corresponding to t...

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Abstract

A method for supercritical fluid extraction of metal from a source, the method comprising: providing a reactor chamber; providing a source comprising a target metal; optionally, providing a chelatingagent; providing a solvent; adding the source comprising the target metal, the chelating agent and the solvent into the reactor chamber; adjusting the temperature and pressure in the reactor chamber so that the solvent is heated and compressed above its critical temperature and pressure; optionally, providing mechanical agitation to the reactor chamber; and recovering a chelate comprising the target metal.

Description

technical field [0001] The present invention relates to the extraction of metals, and more particularly to supercritical fluid extraction-aeriometallurgy of metals from a wide range of sources. Background technique [0002] supercritical fluid extraction [0003] Supercritical fluid extraction (SCFE) processes focus on the energy industry, including direct liquefaction of coal and enhanced oil recovery from petroleum reservoirs. SCFE processes are also involved in the chemical industry, including food and pharmaceuticals. Examples include coffee decaffeination, wood and vegetable oil production, and extraction of organics such as alcohols from aqueous solutions. [0004] In recent years, SCFE has been used to recover various metals. This is a rapidly growing field due to the desirable properties of supercritical fluids (SCFs) as solvents. A fluid is described as supercritical once it has been heated and compressed above its critical temperature and pressure. SCF has lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/02B01J19/18C01D15/00C01F17/10C01F17/17C01F17/235C01F17/224C01G51/00C01G53/00C01G7/00C22B3/46H01M10/54C22B11/00C22B59/00C01F17/276
CPCB01D11/02B01J19/18C01D15/00C01G7/00C01G51/00C01G53/00C22B3/46C22B11/00C22B59/00H01M10/54Y02W30/84Y02P20/54C01F17/276C01F17/224B01D11/0203B01J3/002B01J3/008C22B7/007C22B11/046C22B23/0438C22B26/12C22B30/02
Inventor G·阿齐米Y·B·姚张家恺J·J·阿纳瓦蒂
Owner THE GOVERNING COUNCIL OF THE UNIV OF TORONTO
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