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US 11,661,638 B2Granted
Recovery of nickel and cobalt from Li-ion batteries or their waste
AssigneeUmicore AG & Co. KG
InventorsRyohei Yagi, Lennart Scheunis
Life of this patent
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Abstract
The present invention lies in the field of pyrometallurgy and discloses a process and a slag suitable for the recovery of Ni and Co from Li-ion batteries or their waste. The slag composition is defined according to: 10%<MnO<40%; (CaO+1.5*Li2O)/Al2O3>0.3; CaO+0.8*MnO+0.8*Li2O<60%; (CaO+2*Li2O+0.4*MnO)/SiO2≥2.0; Li2≥1%; and, Al2O3+SiO2+CaO+Li2O+MnO+FeO+MgO>85%. This composition is particularly adapted to limit or avoid the corrosion of furnaces lined with magnesia-bearing refractory bricks.
Claims13
Process for the recovery of Ni and Co from Li-ion batteries or their waste, comprising the steps:
- providing a furnace lined with magnesia-bearing refractory bricks;
- providing a charge comprising slag formers, and Li-ion batteries or their waste;
- and,
- smelting the charge in reducing conditions, thereby obtaining an alloy containing the major part of the Ni and Co, and a slag;
- characterized in that the slag has a percent composition by weight according to:
- 10%<MnO<40%;
- (CaO+1.5*Li2O)/Al2O3>0.3;
- CaO+0.8*MnO+0.8*Li2O<60%;
- (CaO+2*Li2O+0.4*MnO)/SiO2>2.0;
- Li2O>1%;
- and,
- Al2O3+SiO2+CaO+Li2O+MnO+FeO+MgO>85%.
9 more elements
Dependencies are inferred from the claim text.