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Method for preparing high-purity lithium carbonate from salt lake brine

A technology of high-purity lithium carbonate and salt lake brine, applied in lithium carbonate;/acid carbonate and other directions, can solve the problems of difficult industrial production, poor operability, and high product cost, achieve low cost and reduce production cost , the effect of easy industrial production

Active Publication Date: 2013-03-13
TIBET JINHAO INVESTMENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The methods for extracting lithium salt from salt lake brine mainly include precipitation method, extraction method, electrolysis method, ion exchange method, etc. Among them, the methods for preparing the basic lithium salt lithium carbonate are the most, but the above methods must first prepare coarse salt, and then It is further purified, and it is difficult to form industrialized production. The main reason is that the process is poor in operability, the process is long, and the product cost is high

Method used

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  • Method for preparing high-purity lithium carbonate from salt lake brine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Introduce Tibetan Zabuye brine into the solar pond for grading and natural evaporation to obtain highly concentrated brine liquid, then introduce the brine liquid into a crystallizer equipped with an ultrasonic oscillator with a frequency of 33kHz, a power of 250W, and 4L, and seed it , using ultrasonic-assisted crystallization, cooling to room temperature after evaporation, and obtaining crude lithium carbonate crystals with a purity of 68-76%;

[0033] 2) the thick lithium carbonate crystal is dissolved in the hydrochloric acid of 20wt% of stoichiometric ratio, namely with Li + Equivalent of hydrochloric acid to dissolve Li in crude lithium carbonate crystals + , then adjust the pH of the solution to 1-2, and filter to remove insoluble matter containing boron, sediment and other substances;

[0034] 3) Add ammonia water to the filtrate obtained in step 2), adjust the pH of the solution to 4.1 and 5.2 respectively, and reach the end point of iron and aluminum preci...

Embodiment 2

[0041] 1) Introduce Tibetan Zabuye brine into the solar pond for grading and natural evaporation to obtain highly concentrated brine liquid, then introduce the brine liquid into a crystallizer equipped with an ultrasonic oscillation device with a frequency of 20kHz, a power of 250W, and 4L, and seed it , using ultrasonic-assisted crystallization, cooling to room temperature after evaporation, performing rapid crystallization, and obtaining crude lithium carbonate crystals;

[0042] 2) the thick lithium carbonate crystal is dissolved in the hydrochloric acid of 20wt% of stoichiometric ratio, namely with Li + equivalent of hydrochloric acid to dissolve Li + , then adjust the pH of the solution to 1-2, and filter to remove insoluble matter containing boron, sediment and other substances;

[0043] 3) Add sodium hydroxide to the filtrate obtained in step 2), adjust the pH of the solution to 4.5, stir and filter, and remove impurities such as iron and aluminum;

[0044] 4) Continu...

Embodiment 3

[0049] The ultrasonic oscillation frequency of the crystallizer is 40kHz; nitric acid is used for the acid solution, ammonia water is used for the alkali solution, and saturated carbon dioxide is used for the precipitating agent; the pH is adjusted to 5.2 in step 3; the pH is adjusted to 7 in step 4; the pH is adjusted to 12 in step 5. Other steps are with embodiment 2.

[0050] The recovery rate of lithium was 77.45%, and the purity of lithium carbonate was 99.9078%.

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Abstract

The invention discloses a method for preparing high-purity lithium carbonate from salt lake brine. The method comprises the following basic processes in sequence: concentrating the salt lake brine to quickly separate crude lithium carbonate; gradually alkalizing at different grades; precisely controlling the precipitating point; and carbonating to obtain high-purity lithium carbonate, wherein if the metal ion is completely precipitated, the prepared lithium carbonate has the purity up to 99.9% and can be directly applied to the production of lithium batteries; and the recovery rate of Li<+> is also up to about 80%. The method is simple in technology and process, lower in cost, and easy for industrial production; few chemical agents are used in the technology; especially, new metal ion impurity cannot be introduced while ammonia water serves as the alkali liquor; and the technological process is carried out in closed loop, so that ammonia exhausted in firing can be immediately recovered and then returned to the production line to be continuously utilized, except for the precipitated slag, and substances are not discharged to the outside any more, and as a result, no disadvantage influence is brought to the outside environment.

Description

technical field [0001] The invention belongs to the technical field of preparing lithium carbonate, in particular to a method for preparing high-purity lithium carbonate from salt lake brine with a low magnesium-lithium ratio. Background technique [0002] At present, the production of lithium salt raw materials in the world is divided into two types: solid ore and liquid ore. Lithium extraction from minerals has been gradually reduced due to reasons such as high energy consumption and high pollution. However, the use of salt lake brine as raw material to extract lithium salt is less polluted, so the share is increasing year by year. Increase. The methods for extracting lithium salt from salt lake brine mainly include precipitation method, extraction method, electrolysis method, ion exchange method, etc. Among them, the methods for preparing the basic lithium salt lithium carbonate are the most, but the above methods must first prepare coarse salt, and then It is further pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 易丹青王斌邓姝皓
Owner TIBET JINHAO INVESTMENT
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