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Method for preparing lithium hydroxide by industrial-grade lithium carbonate solid

A technology of lithium hydroxide and lithium carbonate, applied in electrolysis process, electrolysis components, etc., can solve the problem of not being able to obtain battery-grade lithium hydroxide

Active Publication Date: 2019-04-26
BEIJING TINGRUN MEMBRANE TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The preparation of lithium hydroxide by lithium carbonate in the prior art requires that lithium carbonate must be pure, otherwise battery-grade lithium hydroxide cannot be obtained

Method used

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  • Method for preparing lithium hydroxide by industrial-grade lithium carbonate solid
  • Method for preparing lithium hydroxide by industrial-grade lithium carbonate solid
  • Method for preparing lithium hydroxide by industrial-grade lithium carbonate solid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Batching concentration 1.3mol / L; Batching volume 1.5m 3 ; then contains Li 2 SO 4 The amount is 1.3mol / L×1.5m 3 =1950mol;

[0055] Then the amount of required industrial grade lithium carbonate is:

[0056]

[0057] Lithium carbonate molar mass is 74g / mol; The molar mass of sulfuric acid is 98g / mol; The raw material uses technical grade Lithium carbonate main content in 99%; Sulfuric acid concentration used is 98%, and excess coefficient is 1.05; Then required raw material quality is:

[0058] (1) Li 2 CO 3 : 1950×74÷99%=145758g≈145.8kg;

[0059] (2)H 2 SO 4 : 1950×98÷98%×1.05=204750g≈204.8kg;

[0060] Industrial grade Lithium carbonate solid is mixed with sulfuric acid to carry out metathesis reaction, obtain metathesis reaction product, metathesis reaction product is adjusted pH value to 7.5 through lithium hydroxide successively, plate and frame filtration (the pressure of plate and frame filtration is 1.6 MPa, filter frame aperture is 3 microns), multi-...

Embodiment 2

[0063] Batching concentration 1.4mol / L; Batching volume 1.5m 3 ; then contains Li 2 SO 4 The amount is 1.4mol / L×1.5m 3 =2100mol;

[0064] Then the amount of required industrial grade lithium carbonate is:

[0065]

[0066] Lithium carbonate molar mass is 74g / mol; The molar mass of sulfuric acid is 98g / mol; The raw material uses technical grade Lithium carbonate main content in 99%; Sulfuric acid concentration used is 98%, and excess coefficient is 1.05; Then required raw material quality is:

[0067] (1) Li 2 CO 3 : 2100×74÷99%=156970g≈156.9kg;

[0068] (2)H 2 SO 4 : 2100×98÷98%×1.05=220500g≈220.5kg;

[0069] The metathesis reaction product is successively adjusted to pH 10 by lithium hydroxide, plate and frame filtration (the pressure of plate and frame filtration is 3 MPa, and the aperture of the filter frame is 8 microns), multi-media filtration (activated carbon, quartz sand and porous ceramics, etc.), After ultrafiltration (pore size is 0.05 micron) and chela...

Embodiment 3

[0072] Batching concentration 1.5mol / L; Batching volume 1.5m 3 ; then contains Li 2 SO 4 The amount is 1.3mol / L×1.5m 3 =2250mol;

[0073] Then the amount of required industrial grade lithium carbonate is:

[0074]

[0075] Lithium carbonate molar mass is 74g / mol; The molar mass of sulfuric acid is 98g / mol; The raw material uses technical grade Lithium carbonate main content in 99%; Sulfuric acid concentration used is 98%, and excess coefficient is 1.05; Then required raw material quality is:

[0076] (1) Li 2 CO 3 : 2250×74÷99%=168181g≈168.2kg;

[0077] (2)H 2 SO 4 : 2250×98÷98%×1.05=236250g≈236.3kg;

[0078] The metathesis reaction product is successively adjusted to a pH value of 13 by lithium hydroxide, plate and frame filtration (the pressure of the plate and frame filtration is 2 MPa, and the pore size of the filter frame is 10 microns), multi-media filtration (activated carbon, quartz sand, porous ceramics, etc.) , after ultrafiltration (pore size is 0.02 mi...

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Abstract

The invention provides a method for preparing lithium hydroxide by an industrial-grade lithium carbonate solid and belongs to the field of preparation of lithium hydroxide. The lithium hydroxide is prepared by taking the industrial-grade lithium carbonate solid as a raw material; solid impurities, sodium, calcium, magnesium, aluminum, iron and other ions in the industrial-grade lithium carbonate solid are removed through pH value regulation, plate and frame filtration, multi-medium filtration, ultra-filtration and chelate resin adsorption treatment; the plate and frame filtration can separatesolid from liquid; the multi-medium filtration is used for removing suspended matters, colloids, organic matters and the like; the ultra-filtration can further reduce the contents of residual COD, thesuspended matters and macromolecular dissolved matters to realize the purification and the separation of the liquid; chelate resin enables the content of high-valent ions in the liquid to meet the bipolar membrane water ingress requirements; sulfate radicals in a pre-electrolyte migrate to an acid chamber and are combined with hydrogen ions decomposed by the surface of a bipolar membrane to formsulfuric acids; lithium ions in the pre-electrolyte migrate to an alkaline chamber and are combined with hydroxyl ions decomposed by the surface of the bipolar membrane to generate the lithium hydroxide.

Description

technical field [0001] The invention belongs to the technical field of lithium hydroxide preparation, in particular to a method for preparing lithium hydroxide from industrial-grade lithium carbonate solid. Background technique [0002] In the traditional process, there are mainly the following two methods for preparing lithium hydroxide from lithium carbonate solid as raw material: [0003] 1. Lime production of lithium hydroxide [0004] 1) Li 2 CO 3 +Ca(OH) 2 =2LiOH+CaCO 3 , heating temperature ≥ 90 ℃, keep warm for two hours; [0005] 2) Separation: the CaCO 3 Solid separation outlet, LiOH stays in the liquid; [0006] 3) Concentrate the liquid to obtain LiOH·H 2 O. [0007] 2. Production of lithium hydroxide by sulfuric acid method [0008] 1) Li 2 CO 3 +H 2 SO 4 = Li 2 SO 4 +H 2 O+CO 2 ; [0009] 2) Li 2 SO 4 +2NaOH=2LiOH+Na 2 SO 4 ; [0010] 3) LiOH and Na 2 SO 4 The mixture of Na at -5 °C 2 SO 4 crystallization separation; [0011] 4) The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/16
CPCC25B1/16
Inventor 谭渊清陈思伟张丽丽郭铭潇李辉李强
Owner BEIJING TINGRUN MEMBRANE TECH DEV
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