▎ 摘　　要

NOVELTY - Production of lithium-ion power battery involves: 1) forming slurry of crude cobalt hydroxide; 2)subjecting slurry to acid leaching, forgming residue and filtrate, washing residue and returning filtrate to leaching step, subjecting residue to toxic testing; 3)oxidizing iron ions, adding ammonium bicarbonate neutralizer to slurry, forming iron-removing slag and iron-removing liquid, returning iron-removing slag to step (2); (4) removing impurities, extracting phosphorus oxide, with cobalt; 5)after preset processing, forming magnesium ammonium sulfate, returning distilled water evaporated from remaining liquid, to step (1), with zero discharge of waste water; 6) using cobalt sulfate solution, performing demagnetization; 7)mixing cobalt sulfate solution with evaporated mother liquor, crystallizing; 8) crystallizing cobalt sulfate concentrate, centrifuging, returning mother liquor to crystallization step, continuing evaporation and crystallization, with cobalt sulfate. USE - Method is used for producing high performance lithium -ion power battery using cobalt sulfate. ADVANTAGE - The method enables to produce high-performance lithium ion power battery, by adopting improved leaching and extraction procedures. The method involves using less amount of raw materials and enables producing ammonium magnesium sulfate byproduct during production process. DETAILED DESCRIPTION - Production of high-performance lithium-ion power battery using cobalt sulfate, involves: 1) mixing distilled water, industrial water and crude cobalt hydroxide, in a slurry tank, to form slurry; 2) pouring the slurry into the leaching tank, adding sulfuric acid and controlling the pH, performing acid leaching reaction, then adding hydrogen peroxide for reduction leaching, adding a small amount of sodium sulfite, if the leaching reaction is incomplete, pressing the filter after leaching, to obtain leaching residue and the leaching filtrate, subjecting the leaching residue to three countercurrent washings, and returning the washed filtrate to the leaching step, and subjecting the washed filter residue to toxic testing; 3) analyzing the pH of the leachate and the concentration of iron ions (Fe2+), adding oxidant hydrogen peroxide, sodium hypochlorite and sodium chlorate to oxidize Fe2+ ions to Fe3+ ions, based on concentration of Fe2+, then adding ammonium bicarbonate neutralizer, to crude cobalt hydroxide slurry prepared in step (1), adjusting pH and precipitating and pressure filtering, to form iron-removing slag and iron-removing liquid, returning iron-removing slag to leaching step (2); 4)adjusiting pH of the formed liquid, extracting and removing impurities through phosphorus tetroxide (P204), saponifying P204 with aqueous ammonia and extracting P204 raffinate separated from nickel and magnesium, by extracting cobalt with P507, saponifying P507 with aqueous ammonia, and back-extracting P507-loaded organic phase with sulfuric acid, to form cobalt sulfate solution; 5) subjecting P507 raffinate to ion exchange impurity removal, secondary reverse osmosis membrane separation and evaporative crystallization to form magnesium ammonium sulfate, then returning distilled water evaporated from remaining liquid, to the pulping section of step (1), with zero discharge of waste water; 6) using cobalt sulfate solution for graphene degreasing, performing demagnetization through a demagnetizer; 7) mixing the cobalt sulfate solution with evaporated mother liquor, to perform mechanical vapour recompression (MVR) evaporative crystallization; 8) pouring the evaporated cobalt sulfate concentrate into the crystallization kettle, for cooling and crystallization, then centrifuging, returning the centrifuged mother liquor to MVR evaporation and crystallization step, after precision filtration and graphene degreasing, and continuing evaporation and crystallization, with cobalt sulfate as centrifugal material.