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Method for preparing lithium carbonate in lithionite

A technology of lepidolite and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, can solve the problems of low safety factor, low comprehensive utilization of by-products, low conversion rate, etc., to reduce energy consumption and equipment Investment, reducing the generation of filter residues, and the effect of mild process conditions

Inactive Publication Date: 2018-06-19
江西浩海锂能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The limestone calcination method adopts a high-temperature fluidized furnace calcination method, the temperature is generally around 1000°C, the conversion rate is low, the energy consumption is high, the equipment requirements are high, and the environmental pollution is large
[0007] To sum up, the existing production process of lepidolite has high cost, low comprehensive utilization of by-products, low safety factor, severe corrosion of equipment, and severe environmental pollution, especially waste residue and waste gas.

Method used

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  • Method for preparing lithium carbonate in lithionite
  • Method for preparing lithium carbonate in lithionite
  • Method for preparing lithium carbonate in lithionite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] A kind of method producing lithium carbonate from lepidolite, comprises the steps:

[0076] (1) Leaching: mix lepidolite with hydrochloric acid with a concentration of 30%, heat to 120° C., stir to make it fully react for 2 hours, filter after completion of the reaction to obtain mother liquor A; wherein the molar ratio of lepidolite to hydrochloric acid with a concentration of 30% is 1:4;

[0077] (2) Extraction: add t-BAMBP to mother liquor A under stirring, temperature 30°C, stir for 30 minutes, static layering, and filter to obtain mother liquor B; wherein the concentration of t-BAMBP is 1.5mol / L, and the alkalinity is 1.5 mmol / L;

[0078] (3) Impurity removal: Slowly add a sodium hydroxide solution with a concentration of 4mol / L in the mother liquor B, adjust the pH to 8, react for 20min, continue to add a calcium hydroxide solution with a concentration of 5mol / L in the mother liquor B, adjust The pH of the solution was 13, and the slag was removed by filtration ...

Embodiment 2

[0082] A kind of method producing lithium carbonate from lepidolite, comprises the steps:

[0083] (1) Leaching: mix lepidolite with hydrochloric acid with a concentration of 15%, heat to 105°C, stir to make it fully react for 1.5h, filter after the reaction is completed, and obtain mother liquor A; wherein the molar ratio of lepidolite to hydrochloric acid with a concentration of 15% is 1:2.8;

[0084] (2) Extraction: add t-BAMBP to the mother liquor A under stirring, temperature 5°C, stir for 30 minutes, static layering, and filter to obtain mother liquor B; wherein the concentration of t-BAMBP is 0.5mol / L, and the alkalinity is 0.5 mmol / L;

[0085] (3) Impurity removal: Slowly add a sodium hydroxide solution with a concentration of 3mol / L in the mother liquor B, adjust the pH to 6.5, react for 15min, continue to add a calcium hydroxide solution with a concentration of 3mol / L in the mother liquor B, adjust The pH of the solution was 11, and the slag was removed by filtrati...

Embodiment 3

[0089] A kind of method producing lithium carbonate from lepidolite, comprises the steps:

[0090] (1) Leaching: mix lepidolite with hydrochloric acid with a concentration of 20%, heat to 110°C, stir to make it fully react for 2h, filter after completion of the reaction to obtain mother liquor A; wherein the molar ratio of lepidolite to hydrochloric acid with a concentration of 30% is 1:4;

[0091] (2) Extraction: Add t-BAMBP to mother liquor A under stirring, temperature 10°C, stir for 30 minutes, static layering, and filter to obtain mother liquor B; wherein the concentration of t-BAMBP is 1.5mol / L, and the alkalinity is 1.5 mmol / L;

[0092] (3) Impurity removal: Slowly add a sodium hydroxide solution with a concentration of 3mol / L in the mother liquor B, adjust the pH to 7, react for 20min, continue to add a calcium hydroxide solution with a concentration of 5mol / L in the mother liquor B, adjust The pH of the solution was 12, and the slag was removed by filtration to obta...

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Abstract

The invention provides a method for preparing lithium carbonate in lithionite. The method comprises the following steps: 1) leaching: mixing lithionite and hydrochloric acid to obtain mother liquor A;2) extracting: adding an extractant in the mother liquor A under a stirring state, and performing static layering to obtain mother liquor B; 3) impurities removal: adding alkali in the mother liquorB, adjusting a pH value, and filtering the material to obtain mother liquor C; 4) calcium removal: adding a saturated sodium carbonate solution in the mother liquor C, and filtering the material to obtain mother liquor D; and 5) condensation and extraction: heating the mother liquor D for condensation, adding the saturated sodium carbonate solution to obtain lithium carbonate. The method uses hydrochloric acid to substitute a traditional sulfuric acid method, reduces the reaction temperature, simplifies the technology flow, solves the problems of high temperature, high pressure and high corrosion of various technologies in the prior art, reduces energy consumption and equipment investment, has the advantages of high resource utilization rate and less environmental pollution, increases thepurity and yield of lithium carbonate, and is in favor of realizing industrial production.

Description

technical field [0001] The invention relates to the field of lithium battery preparation, in particular to a method for preparing lithium carbonate from lepidolite. Background technique [0002] Lepidolite, also known as "scale mica", is mainly composed of KLi 1.5 al 1.5 [AlSi 3 o 10 ](F,OH) 2 , containing Li 2 O is about 1.23-5.90%, containing Al 2 o 3 It is about 23-26% oxides, and also contains other rare metals such as rubidium and cesium. Among them, Yichun City stores the world's largest lepidolite ore, and the mineable amount of lithium oxide accounts for 31% of the country and 8.2% of the world. Lepidolite is the most common lithium mineral. It is an important mineral for extracting lithium to produce lithium carbonate. Its comprehensive development and utilization has very important economic and strategic value. [0003] my country's lithium ore resources are mainly salt lake brine in Qinghai and Tibet, spodumene in Sichuan, and lepidolite in Yichun, Jiangxi...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 葛亮明彭桂永刘志松范汉义李先发
Owner 江西浩海锂能科技股份有限公司