	US 12,281,399 B1
	Method for directly preparing trivalent chromium compound by electrochemical oxidation of ferrochrome
Bo Li, Xining (CN); Haitao Feng, Xining (CN); Yaping Dong, Xining (CN); Zhengrong Niu, Xining (CN); and Wu Li, Xining (CN)
Assigned to QINGHAI INSTITUTE OF SALT LAKES, CHINESE ACADEMY OF SCIENCES, Xining (CN)
Appl. No. 18/723,895
Filed by QINGHAI INSTITUTE OF SALT LAKES, CHINESE ACADEMY OF SCIENCES, Xining (CN)
PCT Filed Apr. 23, 2023, PCT No. PCT/CN2023/090140 § 371(c)(1), (2) Date Jun. 25, 2024, PCT Pub. No. WO2024/130917, PCT Pub. Date Jun. 27, 2024.
Claims priority of application No. 202211671767.8 (CN), filed on Dec. 23, 2022.
Int. Cl. C25B 3/13 (2021.01); C01G 37/02 (2006.01); C01G 49/06 (2006.01); C25B 1/00 (2021.01); C25B 3/23 (2021.01); C25B 11/046 (2021.01)

CPC C25B 3/13 (2021.01) [C01G 37/02 (2013.01); C01G 49/06 (2013.01); C25B 1/00 (2013.01); C25B 3/23 (2021.01); C25B 11/046 (2021.01); C01P 2002/72 (2013.01); C01P 2004/03 (2013.01); C01P 2006/80 (2013.01)]

14 Claims

1. A method for directly preparing a trivalent chromium compound by an electrochemical oxidation of ferrochrome, comprising: putting the ferrochrome as an anode, and placing the anode into an electrolyte solution comprising a complexing agent together with a cathode, then turning on a power supply for an electrolysis reaction to directly convert chromium and iron in the ferrochrome into free Cr³⁺ and free Fe³⁺ respectively, allowing one of the free Cr³⁺ and the free Fe³⁺ to form a stable soluble metal complex with the complexing agent, and allowing remaining one of the free Cr³⁺ and the free Fe³⁺ to form a metal hydroxide solid with OH⁻ generated by the electrolysis reaction to obtain an electrolysis completion slurry.