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Method for producing cell-grade lithium carbonate from lithium concentrate

A lithium carbonate and lithium concentrate technology, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of high impurity content of lithium carbonate, long process flow and high energy consumption, and achieve low impurity content and metal The effect of high recovery rate and low energy consumption

Active Publication Date: 2014-04-09
CINF ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the process flow is long, the energy consumption is high, and the impurity content of lithium carbonate produced is high, and battery-grade lithium carbonate cannot be obtained directly.

Method used

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  • Method for producing cell-grade lithium carbonate from lithium concentrate
  • Method for producing cell-grade lithium carbonate from lithium concentrate
  • Method for producing cell-grade lithium carbonate from lithium concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Concentrate carbonate-type brine and sulfate-type brine according to n(CO 3 2- +HCO 3 - ):n(Ca 2+ +Mg 2+ )=1.1:1 carries out bittern, the bittern after the solid-liquid separation adds sodium carbonate and separates out lithium carbonate, and the chemical composition of the bittern lithium concentrate that separation obtains is as table 2:

[0029] Table 2

[0030]

[0031] (1) Grinding: Add the brine lithium concentrate and industrial water at a ratio of 1:1 to the wet ball mill for ball milling. After ball milling, the particle size of the lithium concentrate is about 200 mesh, which is convenient for subsequent slag washing and bicarbonation.

[0032] (2) Pulp heating: The ball-milled pulp is steam-heated to 90°C in a jacketed reaction tank, stirred and kept for more than 30 minutes, and more than 99% of the soluble salt impurities in the lithium concentrate enter the solution. A vacuum belt filter with rinsing function is used to filter the pulp, and the wa...

Embodiment 2

[0044] Carry out by the method for embodiment 1. Concentrate carbonate-type brine and sulfate-type brine according to n(CO 3 2- +HCO 3 - ):n(Ca 2+ +Mg 2+ )=1.2:1 carries out bittern,, the bittern after solid-liquid separation adds sodium carbonate and separates out the chemical composition of the bittern lithium concentrate that obtains as table 4:

[0045] Table 4

[0046]

[0047] (1) Grinding: Add the brine lithium concentrate and industrial water at a ratio of 1:2 to the wet ball mill for ball milling. After ball milling, the particle size of the lithium concentrate is about 300 mesh.

[0048] (2) Pulp heating: The ball-milled pulp is steam-heated to 98°C in a jacketed reaction tank, stirred and kept for more than 30 minutes, and more than 99% of the soluble salt impurities in the lithium concentrate enter the solution. A vacuum belt filter with rinsing function is used to filter the pulp, and the water content of the filtered lithium concentrate filter cake is a...

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Abstract

The invention relates to a method for producing cell-grade lithium carbonate from lithium concentrate. The method comprises the steps of heating ball-milled lithium concentrate pulp to be at more than 90 DEG C and filtering; carrying out carbonic acid hydrogenation in a carbonating tower; adding thioacetamide, oxalic acid and 8-hydroxyquinoline to remove impurities in lithium hydrogencarbonate liquid such as calcium, magnesium, barium, iron, zinc, copper, lead, aluminum, manganese and nickel; performing pyrolysis, adding EDTA (ethylene diamine tetraacetic acid) to complex impurity ions of calcium, magnesium, barium, iron, zinc, copper, lead, aluminum, manganese and nickel, and refining; and drying and crushing. The method has short flow path, low energy consumption and high metal recovery rate, the produced cell-grade lithium carbonate has low impurity content, and the quality of the cell-grade lithium carbonate meets the requirements of the national standard.

Description

technical field [0001] The invention belongs to the technical field of lithium battery material extraction, and in particular relates to a method for producing battery-grade lithium carbonate from lithium concentrate. Background technique [0002] Tibet's salt lakes are rich in lithium resources, and there are mainly two types of water chemistry: carbonate type and sulfate type. When lithium is extracted from magnesium sulfate subtype salt lake brine, the separation of magnesium and lithium is difficult due to the high content of magnesium in the brine. During the development and utilization of lithium in carbonate-type salt lake brine, lithium ions cannot be highly enriched due to the concentration of carbonate radicals. At present, the main method of producing battery-grade lithium carbonate is the lime causticization method. Lithium concentrate and lime milk react to form lithium hydroxide and calcium carbonate. After the lithium hydroxide solution is purified, the refin...

Claims

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Application Information

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IPC IPC(8): C01D15/08
Inventor 李伟达袁爱武周桂月张军梅
Owner CINF ENG CO LTD
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