Method for recycling lithium battery positive electrode material by using fluorinated zeolite

Method for recycling lithium battery positive electrode material by using fluorinated zeolite

  • CN 107,959,078 B
  • Filed: 11/16/2017
  • Issued: 09/18/2020
  • Est. Priority Date: 11/16/2017
  • Status: Active Grant
First Claim
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1. A method for recovering lithium battery anode materials by using fluorinated zeolite comprises the following specific steps:

  • (1) after the waste lithium batteries are discharged, taking out the anode materials of the lithium ion batteries from the waste lithium ion batteries, cleaning and drying the anode materials, putting the lithium ion batteries into a ball mill for crushing, and stopping when the particle size of the powder subjected to ball milling is 800 meshes below 500, so as to obtain pretreated anode powder;

    the rotating speed of the ball mill is controlled at 500-1200rpm, the ball milling time is controlled at 0.5-1 hour, and a ball milling medium is corundum balls or agate balls;

    (2) immersing the pretreated positive electrode powder into ammonia water, wherein the mass ratio of the positive electrode powder to the ammonia water is 1;

    1-5, and after 2-5h of treatment, filtering out current collector precipitate in a solution through first-stage filtration to obtain alkaline filtrate;

    (3) heating the alkaline filtrate in a water bath environment at 55-60 ℃

    , keeping the temperature of the water bath environment, adding 120-mesh 140-mesh fluoridated zeolite powder into the alkaline filtrate, continuously stirring to adsorb lithium ions, performing secondary filtration, and cleaning filter residues by dilute acid to obtain a lithium-containing solution and acid-washed fluoridated zeolite;

    the mass ratio of the fluoridated zeolite to the anode powder is 1;

    1-3.5;

    (4) mixing the lithium-containing solution with a solution of NaOH and Na2CO3, treating for 0.5-1.5h, and after the reaction is completed, carrying out third-stage filtration and drying to obtain high-purity lithium carbonate/lithium hydroxide powder;

    the first-stage filtration adopts a 600-800-mesh screen;

    the second stage of filtration adopts a 1200-mesh screen to remove residual powder; and

    the third stage of filtration adopts a PVC filter element for filtration.

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