MUMBAI, India, June 30 -- Intellectual Property India has published a patent application (202641074584 A) filed by Minimines Cleantech Solutions Private Limited on June 16, 2026, for A Process For Selective Recovery Of Lithium Carbonate From Spent Lithium Iron Phosphate Batteries.
Inventors include Anupam Kumar; and Arvind Bhardwaj.
The application for the patent was published on June 26, 2026, under issue no. 26/2026.
Abstract: ABSTRACT A PROCESS FOR SELECTIVE RECOVERY OF LITHIUM CARBONATE FROM SPENT LITHIUM IRON PHOSPHATE BATTERIES The invention relates to hydrometallurgical recycling of lithium iron phosphate battery waste, and particularly to a process for selective recovery of lithium carbonate from lithium iron phosphate battery black mass. A spent lithium iron phosphate battery is discharged, dismantled to isolate a cathode sheet, and processed to obtain black mass containing LiFePO4, carbon, and binder. The black mass is leached with an aqueous dual-sulfate medium containing sulfuric acid and sodium sulfate under controlled solid-to-liquid ratio, temperature, time, and agitation to preferentially dissolve lithium while suppressing iron dissolution by increased sulfate ion concentration and ionic strength. After solid-liquid separation, dissolved iron species are removed from the pregnant leach filtrate by sodium hydroxide addition under pH control, optionally with oxidation of Fe2+ to Fe3+. The purified lithium-rich filtrate is reacted with sodium carbonate at elevated temperature and pH to precipitate lithium carbonate, which is recovered by filtration, washing, and drying, with purity of at least about 99%.
Disclaimer: Curated by HT Syndication.
