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US 2025/0011181 A1Published application
Method for preparing lithium hydroxide by using lithium carbonate and barium compound
AssigneeIndustry Foundation of Chonnam National University
InventorMYONG JUN KIM
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Abstract
In a method of preparing lithium hydroxide, a mixture of low-purity lithium carbonate and barium hydroxide is heat-treated, the resulting product obtained through the heat treatment is leached by adding water to form a first slurry including an aqueous lithium hydroxide solution and an insoluble by-product, the first slurry is filtered to separate the lithium hydroxide solution and the insoluble by-product, and the lithium hydroxide solution separated through the filtering of the first slurry is evaporated, thereby obtaining lithium hydroxide.
Claims29
1:
- A method of preparing lithium hydroxide, the method comprising:
- performing heat treatment on a mixture of low-purity lithium carbonate and barium hydroxide;
- leaching the resulting product obtained through the heat treatment by adding water to form a first slurry comprising an aqueous lithium hydroxide solution and an insoluble by-product;
- filtering the first slurry to separate the lithium hydroxide solution and the insoluble by-product;
- and
- evaporating the lithium hydroxide solution separated through the filtering of the first slurry, thereby obtaining lithium hydroxide.
3 more elements
2:
- A method of preparing lithium hydroxide, the method comprising:
- performing heat treatment on a mixture of low-purity lithium carbonate and barium oxide;
- leaching the resulting product obtained through the heat treatment by adding water to form a first slurry comprising an insoluble by-product and a soluble component solution in which a soluble component is dissolved;
- converting lithium carbonate comprised in the soluble component to lithium hydroxide by adding a barium hydroxide solution to the first slurry, thereby forming a second slurry;
- filtering the second slurry to separate a lithium hydroxide solution and the insoluble by-product;
- and
- evaporating the lithium hydroxide solution separated through the filtering of the second slurry, thereby obtaining lithium hydroxide.
4 more elements
3:
- A method of preparing lithium hydroxide, the method comprising:
- performing heat treatment on a mixture of low-purity lithium carbonate, barium hydroxide, and barium oxide;
- leaching the resulting product obtained through the heat treatment by adding water to form a first slurry comprising an insoluble by-product and a soluble component solution in which a soluble component is dissolved;
- converting lithium carbonate comprised in the soluble component to lithium hydroxide by adding a barium hydroxide solution to the first slurry, thereby forming a second slurry;
- filtering the second slurry to separate a lithium hydroxide solution and the insoluble by-product;
- and
- evaporating the lithium hydroxide solution separated through the filtering of the second slurry, thereby obtaining lithium hydroxide.
4 more elements
4:
- The method of claim 1, wherein in the performing of the heat treatment, one or more reactions represented by Chemical Equations 1 and 2 occur.
- Li2CO3(s)+Ba(OH)2(s)→2LiOH(s)+BaCO3(s) [Chemical Equation 1]
- Li2CO3(s)+BaO(s)→Li2O(s)+BaCO3(s) [Chemical Equation 2]
5:
- The method of claim 2, wherein in the leaching of the resulting product, reactions represented by Chemical Equations 3 and 4 occur.
- Li2O(s)+H2O→2LiOH(aq) [Chemical Equation 3]
- Li2CO3(s)→Li2CO3(aq) [Chemical Equation 4]
6:
- The method of claim 5, wherein in the converting of lithium carbonate, a reaction represented by Chemical Equation 5 occurs.
- Li2CO3(aq.)+Ba(OH)2(aq.)→2LiOH(aq.)+BaCO3(s) [Chemical Equation 5]
7:
- The method of claim 1, wherein in the evaporating of the lithium hydroxide solution, a reaction represented by Chemical Equation 6 occurs.
- LiOH+xH2O→LiOH·H2O [Chemical Equation 6]
8:
- The method of claim 1, further comprising performing reduction heat treatment on a mixture of a carbon raw material and the insoluble by-product obtained through the filtering of the first or second slurry in a reducing atmosphere.
9:
- The method of claim 8, wherein in the performing of the reduction heat treatment, a reaction represented by Chemical Equation 7 occurs.
- BaCO3(s) (99.5%)+C(s)→BaO(s)+2CO(g):
- 2CO+O2→2CO2 [Chemical Equation 7]
10:
- The method of claim 9, wherein BaO(s) obtained from a reaction represented by Chemical Equation 7 is reused as barium oxide required in the performing of the heat treatment.
11:
- The method of claim 8, further comprising:
- leaching the resulting product obtained through the reduction heat treatment by adding water to form a third slurry comprising an aqueous barium hydroxide solution and impurities;
- filtering the third slurry to separate the barium hydroxide solution and the impurities;
- and
- evaporating the barium hydroxide solution separated through the filtering of the third slurry to obtain barium hydroxide.
2 more elements
12:
- The method of claim 11, wherein in the leaching of the resulting product, a reaction represented by Chemical Equation 8 occurs, and
- in the evaporating of the barium hydroxide solution, a reaction represented by Chemical Equation 9 occurs.
- BaO(s)+H2O(l)→Ba(OH)2(aq.) [Chemical Equation 8]
- Ba(OH)2(aq.)+xH2O→Ba(OH)2(s) [Chemical Equation 9]
1 more element
13:
- The method of claim 12, wherein BaO(s) obtained from the reaction represented by Chemical Equation 9 is reused as barium hydroxide required in the performing of the heat treatment.
14:
- The method of claim 1, wherein the heat treatment is performed at a temperature in a range of 150° C. to 250° C. in an inert atmosphere.
15:
- The method of claim 8, wherein the reduction heat treatment is performed at a temperature in a range of 850° C. to 1,100° C. in an inert atmosphere.
16:
- The method of claim 8, wherein the carbon raw material comprises any one or more selected from the group consisting of graphite, activated carbon, carbon black, amorphous carbon, and a combination thereof.
17:
- The method of claim 8, wherein barium carbonate comprised in the insoluble by-product and the carbon raw material are mixed such that a molar ratio thereof is in a range of 1:0.95 to 1:2.
18:
- The method of claim 1, wherein in the performing of the heat treatment, a molar ratio of lithium carbonate to barium hydroxide or barium oxide comprised is in a range of 1:0.5 to 1:1.5.
19:
- The method of claim 3, wherein in the performing of the heat treatment, lithium carbonate, barium hydroxide, and barium oxide are comprised such that the total amount of barium hydroxide and barium oxide is in a range of 0.5 to 1.5 moles per 1 mole of lithium carbonate.
20:
- The method of claim 2, wherein in the performing of the heat treatment, a molar ratio of lithium carbonate to barium hydroxide or barium oxide comprised is in a range of 1:0.5 to 1:1.5.
21:
- The method of claim 2, further comprising performing reduction heat treatment on a mixture of a carbon raw material and the insoluble by-product obtained through the filtering of the first or second slurry in a reducing atmosphere.
22:
- The method of claim 21, wherein in the performing of the reduction heat treatment, a reaction represented by Chemical Equation 7 occurs.
- BaCO3(s) (99.5%)+C(s)→BaO(s)+2CO(g):
- 2CO+O2→2CO2 [Chemical Equation 7]
23:
- The method of claim 22, wherein BaO(s) obtained from a reaction represented by Chemical Equation 7 is reused as barium oxide required in the performing of the heat treatment.
24:
- The method of claim 21, further comprising:
- leaching the resulting product obtained through the reduction heat treatment by adding water to form a third slurry comprising an aqueous barium hydroxide solution and impurities;
- filtering the third slurry to separate the barium hydroxide solution and the impurities;
- and
- evaporating the barium hydroxide solution separated through the filtering of the third slurry to obtain barium hydroxide.
2 more elements
25:
- The method of claim 24, wherein in the leaching of the resulting product, a reaction represented by Chemical Equation 8 occurs, and
- in the evaporating of the barium hydroxide solution, a reaction represented by Chemical Equation 9 occurs.
- BaO(s)+H2O(l)→Ba(OH)2(aq.) [Chemical Equation 8]
- Ba(OH)2(aq.)+xH2O→Ba(OH)2(s) [Chemical Equation 9]
1 more element
26:
- The method of claim 25, wherein BaO(s) obtained from the reaction represented by Chemical Equation 9 is reused as barium hydroxide required in the performing of the heat treatment.
27:
- The method of claim 2, wherein the heat treatment is performed at a temperature in a range of 150° C. to 250° C. in an inert atmosphere.
28:
- The method of claim 21, wherein the reduction heat treatment is performed at a temperature in a range of 850° C. to 1,100° C. in an inert atmosphere.
29:
- The method of claim 21, wherein the carbon raw material comprises any one or more selected from the group consisting of graphite, activated carbon, carbon black, amorphous carbon, and a combination thereof.