Ultrafast flash joule heating synthesis methods and systems for performing same

Patent metadata

Field	Value
Publication number	US-2023357885-A1
Application number	US-202118246451-A
Country	US
Kind code	A1
Filing date	Sep 24, 2021
Priority date	Sep 24, 2020
Publication date	Nov 9, 2023
Grant date	—

Abstract

Ultrafast flash Joule heating synthesis methods and systems, and more particularly, ultrafast synthesis methods to recover precious metals recovery and other metals from electronic waste (e-waste).

First claim

1 . A method of recovering metal, wherein the method comprises:
(a) mixing a material with a conductive additive to form a mixture, wherein
(i) the material is prepared from electronic waste (e-waste), and
(ii) the e-waste is a waste material from one or more devices selected from a group consisting of computers, smartphones, electrical devices, electronic devices, displays, printed circuit boards, and combinations thereof;
(b) applying a voltage across the mixture to recover metal from the material utilizing a flash Joule heating process, wherein
(i) the voltage is applied in one or more voltage pulses, and
(ii) duration of each of the one or more voltage pulses is for a duration period; and
(c) collecting the recovered metal.

2 - 5 . (canceled)

6 . The method of claim 1 , wherein the material is prepared by performing a mechanical process to transform the material into a fine powder.

7 . The method of claim 6 , wherein the mechanical process is selected from a group consisting of cutting the material into small pieces, crushing the material, grinding the material, milling the material, and combinations thereof.

8 . The method of claim 6 , wherein the fine powder is a microscale fine powder.

9 . The method of claim 1 , wherein the conductive additive is selected from a group consisting of elemental carbon, carbon black, graphene, flash graphene, coal, anthracite, coke, metallurgical coke, calcined coke, activated charcoal, biochar, natural gas carbon that had been stripped of its hydrogen atoms, activated charcoal, shungite, plastic waste, plastic waste-derived carbon char, food waste, food waste-derived carbon char, biomass, biomass-derived carbon char, hydrocarbon gas, and mixtures therefrom.

10 - 11 . (canceled)

12 . The method of claim 1 , wherein the conductive additive is selected from the group consisting of metals, metal salts, metal oxides, metalloids, metal complexes, conductive phosphorus, and non-metal conductive materials.

13 - 15 . (canceled)

16 . The method of claim 12 , wherein the material and the conductive additive are mixed at a weight ratio in a range of 1:2 and 25:1.

17 - 34 . (canceled)

35 . The method of claim 1 , wherein the metal comprises a rare earth element.

36 . The method of claim 1 , wherein the metal comprises a precious metal.

37 . The method of claim 1 , wherein the metal comprises a toxic heavy metal.

38 . The method of claim 1 , wherein
(a) the materials comprises a metal oxide; and (b) the step of applying a voltage across the mixture results in a carbothermic reaction of the metal oxide to recover the metal.

39 . The method of claim 1 , wherein
(a) the applying of the voltage across the mixture to recover the metal from the material is performed at a pressure between 0.001 and 25 atmospheres; (b) the method is performed using a pressurized cell; (c) the applying of the voltage across the mixture to recover the metal from the material results in a majority of the metal remaining with graphene created by the flash Joule heating process; and (d) the collecting of the recovered metal comprises separating the metal from the graphene.

40 - 48 . (canceled)

49 . The method of claim 39 , wherein the separating of the metal from the graphene comprises oxidizing the graphene away chemically.

50 - 52 . (canceled)

53 . The method of claim 39 , wherein the separating of the metal from graphene comprises calcinating the graphene away to leave a metal species selected from a group consisting of metal, metal oxide, metal carbide, metal salt, and combinations thereof.

54 . The method of claim 1 , wherein the mixture of the material and the conductive additive further comprises a halogen containing compound.

55 - 56 . (canceled)

57 . The method of claim 1 , wherein the step of collecting comprises collecting a gas stream comprising volatized products produced by the application of the voltage across the mixture.

58 - 59 . (canceled)

60 . The method of claim 1 , wherein
(a) the step of applying a voltage across the mixture heats and evaporates metals from the mixture forming a metal vapor; and (b) the step of collecting the recovered materials comprises
(i) transporting the metal vapors under low pressure, and
(ii) utilizing a condenser or trap to condense the metal vapor for collection.

61 . The method of claim 60 , wherein the metal vapor comprises metal halides.

62 . The method of claim 60 , wherein the transporting of the metal vapors is under a vacuum.

63 . The method of claim 1 , wherein the step of collecting further comprises performing a leaching process after applying the voltage across the mixture.

64 . (canceled)

65 . The method of claim 63 , wherein the leaching process is performed using a diluted acid.

66 - 68 . (canceled)

69 . A system for performing the method of recovering metal utilizing method of claim 1 , wherein the system comprises:
(a) a source of the mixture comprising the material and conductive additive, wherein
(i) the material comprises electronic waste (e-waste), and
(ii) the e-waste is a waste material from one or more devices selected from a group consisting of computers, smartphones, electrical devices, electronic devices, displays, printed circuit boards, and combinations thereof;
(b) a cell operably connected to the source such that the mixture can be flowed into the cell and held under compression; (c) electrodes operatively connected to the cell; and (d) a flash power supply for applying a voltage across the mixture to recover the metal from the material.

70 - 74 . (canceled)

75 . The system of claim 69 , wherein the recovered metal comprises one or metals selected from the group consisting of (A) metals comprising a rare earth element, (B) precious metals, (C) toxic heavy metals, and (D) combinations thereof.

76 . The method of claim 1 , wherein the recovered metal comprises one or metals selected from the group consisting of (A) metals comprising a rare earth element, (B) precious metals, (C) toxic heavy metals, and (D) combinations thereof.

77 . The method of claim 35 , wherein the rare earth element is selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y.

78 . The method of claim 36 , wherein the precious metal is selected from the group consisting of Rh, Pd, Ag, Ir, Ru, Pt, and Au.

79 . The method of claim 37 , wherein the toxic metal is selected from the group consisting of Cr, As, Cd, Hg, and Pb.

80 . The method of claim 1 , wherein
(a) the recovered metal comprises Au, and (b) the Au collected in the collection step is in a recovery yield that is greater than 60% of the Au that was in the material prepared from the e-waste.

81 . The method of claim 1 , wherein
(a) the recovered metal comprises at least one of Rh, Pd, Ag, Ir, Ru, and Pt, and (b) the at least one of Rh, Pd, Ag, Ir, Ru, and Pt collected in the collection step is in a recovery yield that is greater than 80% of the at least one of Rh, Pd, Ag, Ir, Ru, and Pt that was in the material prepared from the e-waste.

Assignees

• Univ Rice William M

Inventors

• Tour James M
• Deng Bing

Classifications

• C22B7/001 Primary

  Dry processes · CPC title

• C22B1/245

  with carbonaceous material for the production of coked agglomerates · CPC title

• C22B7/007

  by acid leaching · CPC title

• C22B11/046

  from manufactured products, e.g. from printed circuit boards, from photographic films, paper or baths · CPC title

• C22B11/025

  from manufactured products, e.g. from printed circuit boards, from photographic films, paper, or baths · CPC title