Method for extracting lithium and nickel cobalt from waste lithium ion battery step by step

Abstract

The invention discloses a method for extracting lithium and nickel cobalt from a waste lithium ion battery step by step, and belongs to the technical field of comprehensive recovery of lithium ion battery materials. The method comprises the following steps of splitting, crushing and screening a waste lithium ion battery to obtain a positive electrode material powder, carrying out reduction roasting on the positive electrode material powder with a carbon-containing reducing agent, size mixing the obtained calcine with water, adding a proper amount of calcium chloride or lime milk solution for reaction transformation, selecting lithium carbonate in the calcine to be extracted into the solution, thereby realizing separation with nickel, cobalt, manganese, iron, aluminum and phosphorus. The method can realize the preferential selective extraction of lithium, the obtained lithium solution is high in purity and lithium concentration, the extraction and impurity removal, evaporation and concentration processes are not needed, the recovery of lithium and the product preparation process are simple, the recovery rate is high, the energy consumption is low, and the environmental problem of high-concentration sodium salt wastewater is not present```.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery material recovery, and relates to a step-by-step recovery method for lithium and nickel-cobalt from waste lithium-ion battery materials, in particular to a method for recovering waste lithium-ion battery anode materials with salt substances after reduction roasting Transformational and preferential lithium extraction methods. Background technique [0002] Lithium is the core raw material of lithium-ion batteries. With the rapid growth of the output of new energy materials represented by lithium-ion batteries, the global demand for lithium is also growing rapidly. Lithium ore resources can be divided into two types: ore lithium and brine lithium. It mainly occurs in salt lake brine and granite pegmatite deposits, among which salt lake brine lithium accounts for 66% of the world's lithium reserves and more than 80% of the reserve base, and has become the main source of lithium in the wo...

AI Technical Summary

Problems solved by technology

[0012] Regardless of direct reduction acid leaching or acid leaching after pretreatment, the lithium in the positive electrode material and the iron, cobalt, manganese, nickel, aluminum and other metals in the positive electrode material are leached at the same time. Purification processes such as nickel, cobalt, copper and manganese, and then carbonate precipitation to recover lithium, resulting in a long lithium recovery process and low recovery rate; and because almost all metals in the positive electrode material are dissolved, resulting in low lithium ion concentration in the leaching solution. A large amount of evaporation and concentration is required to meet the requirements of carbonate precipitation lithium; due to the use of extraction to remove nickel, cobalt and copper, etc., the concentration of sodium ions in the purified lithium solution is high, affecting the purity of lithium salt products, and there are high-salt wastewater environmental problems

In addition, the positive electrode powder after reduction and roasting is leached with water and carbonation leaching with carbon dioxide, which is still a weak acid leaching, and it is difficult to completely remove impurities such as nickel, cobalt, iron, manganese, aluminum, and affected by the dissolution rate of carbon dioxide water. The problem of slow leaching speed and low leaching rate

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