A kind of method utilizing anhydrous lithium hydroxide to prepare high-purity lithium oxide

A technology of anhydrous lithium hydroxide and lithium oxide, applied in the chemical field, can solve problems such as potential safety hazards, environmental pollution, and increased production costs, and achieve the effects of low production costs, reduced environmental pollution, and reduced production costs

Active Publication Date: 2016-08-17
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A large amount of ethanol is used, on the one hand, it increases the production cost, on the other hand, it pollutes the environment and has potential safety hazards

Method used

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  • A kind of method utilizing anhydrous lithium hydroxide to prepare high-purity lithium oxide
  • A kind of method utilizing anhydrous lithium hydroxide to prepare high-purity lithium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Distillation under reduced pressure: 5.0kg of hydrogen peroxide with a concentration of 50% was added to the airtight reaction vessel A, and under a relative vacuum of -0.01MPa, the hydrogen peroxide was distilled under reduced pressure for 2 hours, and the distillation temperature was 40°C to obtain a concentration of 95% hydrogen peroxide. concentrated hydrogen peroxide;

[0033] 2) Preliminary oxidation: Press 2.5kg of high-concentration hydrogen peroxide obtained in step 1) into another closed reaction vessel B containing 3.4kg of anhydrous lithium hydroxide, then vacuumize to -0.01MPa, and adjust the temperature to 40°C , stirred for 1h, the purity of lithium hydroxide is 99.95%, particle size D 50 5 μm;

[0034] 3) Deep oxidation: raise the temperature of the material in the reaction vessel B to 60°C, keep the vacuum degree in the vessel at -0.01MPa, and heat for 1 hour to obtain lithium peroxide;

[0035] 4) Thermal decomposition: heat up the lithium peroxid...

Embodiment 2

[0038] 1) Distillation under reduced pressure: Add 8.0 kg of hydrogen peroxide with a concentration of 70% into the airtight reaction vessel A, and distill under reduced pressure for 4 hours at a relative vacuum of -0.09 MPa at a distillation temperature of 50°C to obtain hydrogen peroxide with a concentration of 97%. ;

[0039] 2) Preliminary oxidation: Press 5.5kg of high-concentration hydrogen peroxide obtained in step 1) into another closed reaction vessel B containing 7.0kg of anhydrous lithium hydroxide, then vacuumize to -0.09MPa, and adjust the temperature to 50°C , stirred and reacted for 5h, the purity of lithium hydroxide was 99.93%, and the particle size was D 50 20μm;

[0040] 3) Deep oxidation: raise the temperature of the material in the reaction vessel B to 100°C, keep the vacuum degree in the vessel at -0.09MPa, and heat for 5 hours to obtain lithium peroxide;

[0041] 4) Thermal decomposition: heat up the lithium peroxide obtained in step 3) to 500° C., keep ...

Embodiment 3

[0044] 1) Distillation under reduced pressure: Add 20kg of hydrogen peroxide with a concentration of 30% into the airtight reaction vessel A, and distill under reduced pressure for 2.5 hours at a relative vacuum of -0.05MPa, the distillation temperature is 45°C, and the concentration is 96%. hydrogen peroxide;

[0045] 2) Preliminary oxidation: Press 6.0kg of high-concentration hydrogen peroxide obtained in step 1) into another closed reaction vessel B containing 7.8kg of anhydrous lithium hydroxide, then vacuumize to -0.05MPa, and adjust the temperature to 45°C , stirred for 3h, the purity of lithium hydroxide is 99.95%, particle size D 50 13μm;

[0046] 3) Deep oxidation: raise the temperature of the material in the reaction vessel B to 80°C, keep the vacuum degree in the vessel at -0.05MPa, and heat for 3 hours to obtain lithium peroxide;

[0047] 4) Thermal decomposition: heat up the lithium peroxide obtained in step 3) to 450° C., keep the relative vacuum of the reactio...

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Abstract

The invention relates to a method for preparing high-purity lithium oxide by using anhydrous lithium hydroxide, comprising the following process steps: 1) vacuum distillation; 2) preliminary oxidation; 3) deep oxidation; 4) thermal decomposition; 5) grinding and sieving, etc. step. The method for preparing high-purity lithium oxide by using lithium hydroxide of the present invention has the advantages of simple and practical process, low production cost, less equipment investment, high product purity, and environmental protection.

Description

technical field [0001] The invention belongs to the field of chemistry, and in particular relates to a method for preparing high-purity lithium oxide by using anhydrous lithium hydroxide. Background technique [0002] At present, there are four main methods for preparing lithium oxide at home and abroad: (1) direct oxidation of lithium metal to prepare lithium oxide; (2) heating lithium carbonate at 700 ° C for 50 h to prepare lithium oxide; (3) anhydrous lithium hydroxide Decomposition method; (4) react lithium peroxide with monohydrate lithium hydroxide and hydrogen peroxide to generate lithium peroxide, then heat and decompose lithium peroxide under vacuum conditions to prepare lithium oxide. The first method has low yield and high cost, and due to the high activity of lithium metal, there is a potential safety hazard in the reaction; the second method has high energy consumption, low output per unit time and low labor generation rate, poor economic benefits, and the puri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/02
Inventor 李良彬白有仙彭爱平李芳芳邓云华肖勇章小明马木林
Owner GANFENG LITHIUM CO LTD
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