Method for preparing battery-stage anhydrous lithium chloride

Method for preparing battery-stage anhydrous lithium chloride

  • CN 101,125,667 A
  • Filed: 09/18/2007
  • Published: 02/20/2008
  • Est. Priority Date: 09/18/2007
  • Status: Active Application
First Claim
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1. the preparation method of battery-stage anhydrous lithium chloride comprises the following steps:

  • (1), at lithium concentrate acid grog leaching liquid---add calcium chloride in the lithium sulfate solution, and add NaOH accent pH, obtain CaSO after the reaction except that Fe, Mg 42H 2O, Fe (OH) 3, Mg (OH) 2Precipitation and lithium chloride solution;

    (2), with products therefrom in the step (1) after filtration, washing, remove CaSO 42H 2O, Fe (OH) 3, Mg (OH) 2Precipitation gets LiCl solution, i.e. conversion fluid;

    (3), in conversion fluid, add BaCO 3, remove SO with washing after filtration after the reaction 42-, Ca 2+, get LiCl refined liquid 1;

    (4), in LiCl refined liquid 1, add to boil behind the HCl and remove CO 32-, adding NaOH liquid readjustment pH then, evaporation concentration after crystallisation by cooling, the separation, is removed NaCl then, gets LiCl refined liquid 2;

    (5), in LiCl refined liquid 2, add finishing agent, remove Na with washing after filtration after the reaction, LiCl finish liquid, reconcentration dry battery-grade anhydrous LiCl product.

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