IP Library › Granted Patent US 12,577,633
Granted Patent B2
US 12,577,633 · App. 16/063,993 · Granted Mar 17, 2026

Agent for selective metal recovery, metal recovery method, and metal elution method

Inventor: Ayumi Minoda (Tokyo, JP)
Assignee: Galdieria Co., Ltd.
C22B3/18B01J20/22B01J20/24B01J20/345B01J45/00C02F3/322C12N1/12C22B3/14C22B3/1666C22B3/44C22B7/00C22B11/00C22B59/00B01J2220/4843C02F2101/20Y02P10/20
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Quick Facts
Patent No.
US 12,577,633
App. No.
16/063,993
Granted
Mar 17, 2026
Kind
B2
Abstract

The agent for selective metal recovery of the present invention includes a material derived from an alga belonging to the order Cyanidiales, which is dead cells or a cell surface layer of an alga belonging to the order Cyanidiales, or an artificial material produced by simulating the cell surface layer, or includes a porphyrin. The metal recovery method of the present invention includes an addition step of adding a material derived from an alga belonging to the order Cyanidiales, which is dead cells or a cell surface layer of an alga belonging to the order Cyanidiales, or an artificial material produced by simulating the cell surface layer, or adding a porphyrin, to a metal solution; and a recovery step of recovering a metal from the metal solution by the material derived from an alga belonging to the order Cyanidiales or the porphyrin.

Claims (15)

1 . A method of recovering gold or palladium, the method comprising:

adding a material to a noble metal solution containing gold or palladium, wherein the material comprises freeze-thawed dead cells of algae belonging to Galdieria sulphuraria , wherein the material does not contain living cells of the algae;

adsorbing noble metal ions from the noble metal solution to the material at a pH of about 5;

optionally, reducing the noble metal ions to form nanoparticles; and

recovering the nanoparticles and/or the material with adsorbed noble metal ions from the noble metal solution,

wherein the method improves recovery of the noble metal when compared to using living cells, and

wherein the adsorbing comprises adsorbing at least 4 ppm of gold ion from the noble metal solution, or

at least 4 ppm of palladium ion.

2 . The metal recovery method according to claim 1 , wherein the material further comprises a porphyrin, and the porphyrin comprises coproporphyrin.

3 . The metal recovery method according to claim 1 , wherein the material further comprises a porphyrin, and the porphyrin comprises a protonated compound.

4 . The metal recovery method according to claim 1 , wherein the material comprises the algae's cell surface layer, and the adsorbing comprises adsorbing a noble metal ion complex by an electrostatic interaction or ion exchange.

5 . The metal recovery method according to claim 1 , wherein the material further comprises a porphyrin, and the porphyrin forms the nanoparticles by reducing a noble metal.

6 . The metal recovery method according to claim 1 , comprising forming the nanoparticles by reducing a noble metal ion.

7 . The metal recovery method according to claim 1 , wherein the material further comprises porphyrin.

8 . The metal recovery method according to claim 1 , wherein the material further comprises a cell surface layer of the algae.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 28, 2022
From: MINODA, AYUMI
To: GALDIERIA CO., LTD.
Reel/Frame 059762/0723 →
Priority Claims (1)
JP 2015-249567 · Dec 22, 2015 · national
Continuity (1)
Related Publication 20190024209A1 · Jan 24, 2019
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