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Method for obtaining concentrated brine of minimum impurity content from brine found in natural salt flats and salt marshes, said method having minimum environmental impact and maximum lithium recovery

A technology of impurity content and natural salt, applied in chemical instruments and methods, lithium carbonate;/acid carbonate, lithium compounds, etc., can solve problems such as impossible recovery, many substances of interest, and increased ratio

Pending Publication Date: 2020-07-24
丹尼尔恩内斯托加利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this reduction can be limited by using low-lithium-concentration brine from the early stages of the solar evaporative concentration process to leach salt harvested from evaporation ponds where lithium-carnallite is precipitated, the leaching process has the following disadvantages: (i) practical It is impossible to recover all the lithium contained in lithium-carnallite; (ii) the leaching should then be done while draining and washing the precipitated salt in the pool where the lithium-carnallite was deposited (meaning it takes longer to to reach the maximum production that the pool system can deliver); and (iii) a significant increase in operating costs
However, this method has the following disadvantages: (i) larger amounts of reagents must be used; (ii) the amount of solid effluent after treatment is also higher, which means that more species of interest are lost in the solid effluent; and (iii) ) salt crystallized and precipitated in different pools does not contain concentrated natural brine as a wetting solution, but treated and concentrated brine
On the other hand, the return of doped brines with low lithium content will definitely increase the magnesium / lithium ratio, sulfate / lithium ratio and boron / lithium ratio
These ratio increases result in lower recoveries over time through increased reagent usage and solid effluent generation
[0050] Finally, as a summary, the approaches employed in the prior art do not prioritize what is necessary to ensure that activities are sustainable over time
None of these methods take advantage of all the advantages offered by alpine weather conditions
Furthermore, many of these methods do not prioritize maximizing recovery, and some of them are only aimed at obtaining lithium compounds without considering the integrated use of natural brine extracted from aquifers contained in salt bodies. importance

Method used

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  • Method for obtaining concentrated brine of minimum impurity content from brine found in natural salt flats and salt marshes, said method having minimum environmental impact and maximum lithium recovery
  • Method for obtaining concentrated brine of minimum impurity content from brine found in natural salt flats and salt marshes, said method having minimum environmental impact and maximum lithium recovery
  • Method for obtaining concentrated brine of minimum impurity content from brine found in natural salt flats and salt marshes, said method having minimum environmental impact and maximum lithium recovery

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0232] Example 1: Natural brine from the salt flats of Diablelos

[0233] The salt flat is a salt mine located in the Puna region of Argentina with an altitude of more than 3,900m.

[0234] Field and laboratory tests

[0235] Phase I: Initial pre-concentration

[0236] On the first day, at an altitude of 4,050m, natural salt water (marked 1 FL(i)) to start the solar evaporation and fractional crystallization process.

[0237] 1 FL(i): the initial liquid phase of stage Ⅰ

[0238]

[0239] 1 V: Volume

[0240] 2 A: Area

[0241] 3 h: height

[0242] 4 STD: total dissolved solids

[0243] 5 ρ: density

[0244] 6 T: temperature

[0245] The chemical composition of the initial liquid phase (FL(i)):

[0246]

[0247]

[0248]

[0249]

[0250] Sub-stage I.1

[0251] The salt water (FL(I)) placed in three ponds was exposed to solar evaporation at an altitude of 4,050m for 10 days. On the 19th day, the precipitated crystals were separated from the liquid phase, and the following results were obtained:...

example 2

[0653] Example 2: Natural brine from Perzueros salt flats

[0654] The salt flat is a salt mine located in the Puna region of Argentina at an altitude of more than 3800 meters.

[0655] Field and laboratory tests

[0656] The lithium content in the natural brine that performs ECL is 0.380g / dm 3 , The limited volume to start the test is 842dm 3 .

[0657] On the first day, 890dm was extracted from the Perzueros salt flat pump 3 Natural brine. The brine (denoted as FL(i)) was transported to the center outside the laboratory in the Tres Moros region, Jujuy Province, Argentina, and the brine was injected into an area of ​​approximately 1.5m the next day 2 The three are similar to the pool. The average height of FL(i) in the pool is approximately equal to 0.197m.

[0658] Natural salt water (FL(i)):

[0659] Weight of FL(i)1,022 kg 1 ρ(FL(i))

1.19kg / dm 3

2 V(FL(i))

890dm 3

3 STD(FL(i))

319g / dm 3

[0660] 1 ρ(FL(i)): liquid phase density of phase I

[0661] 2 V(FL(i)): liquid ph...

example 3

[1047] Example 3: Natural brine from the Rio Grande salt flats

[1048] The salt flat is a salt mine located in the Puna region of Argentina with an altitude of more than 3,800m.

[1049] Field and laboratory tests

[1050] The lithium content in the natural brine that performs ECL is 0.340g / dm 3 , The limited volume to start the test is 835dm 3 .

[1051] On day 1, 840 dm3 of natural brine was extracted by pumping from an existing well in the Rio Grande Salt Marsh. The depth of the well is about 30m. The coordinates that define the location of the well are:

[1052] Latitude: 25°5’27.2”-Longitude: 68°8’23.6”

[1053] The natural brine (denoted as FL(i)) was transported to the center outside the laboratory in the Tres Moros region, Jujuy Province, Argentina, and the natural brine was injected about 1.5m on the second day 2 The three are similar to the pool. The average height in the pool is about 0.186m.

[1054] Natural salt water (FL(i))

[1055] FL(i) quality1,022 kg 1 ρ(FL(i)) ...

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Abstract

The invention relates to a method for obtaining concentrated brine of minimum impurity content from brine found in natural salt flats and salt marshes, said method having minimum environmental impactand maximum lithium recovery. The method is characterised in that it comprises the steps of: a) constructing ponds for fractional crystallisation based on solar evaporation; b) filling the ponds withnatural brine; c) initially pre-concentrating the natural brine until the maximum possible lithium concentration in the liquid phase is obtained, without lithium-containing salts being precipitated; d) cooling the pre-concentrated brine obtained in step (c), ensuring the maximum precipitation of salts containing sulphate anion; e) chemically pre-treating the liquid phase of the brine separated from the salts precipitated by means of cooling in order to minimise sulphate anions in the liquid phase after cooling; f) finally pre-concentrating the pre-treated liquid phase until the maximum possible lithium concentration in the liquid phase is obtained, without lithium-containing salts being precipitated; g) chemically treating the liquid phase of the brine separated from the salts precipitatedin step (f) in order to minimise the concentration of magnesium, calcium, boron and sulphate in the liquid phase; and h) concentrating the liquid phase obtained in step (g).

Description

Technical field [0001] The present invention relates to the extraction and processing of natural brine saturated with evaporative deposits of chemical and detrital origin, which is formed in salt bodies such as Puna, Argentina, the Bolivian plateau and the Atacama desert Of different types of aquifers. Specifically, the present invention refers to obtaining a lithium ion concentration of about 80g / dm with minimal environmental impact 3 , The maximum recovery method of brine with the lowest impurity content (making it chemically suitable for obtaining high-purity lithium compounds). More specifically, the present invention also includes a recovery method for obtaining other interesting salts used in agriculture, animal husbandry and industry with minimal environmental impact. Background technique [0002] Specifically, the salt flats and salt marshes of Puna, Argentina, the Bolivian Plateau, and the Atacama Desert are salt mines located in an inflow basin that serves as a contain...

Claims

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Application Information

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IPC IPC(8): C01D15/08C22B26/12
CPCC01D15/08C22B26/12Y02P10/20C01D3/06C01D15/02C01D15/00C01F11/46C01F11/462C01F5/24C01F5/22C22B3/20
Inventor 丹尼尔·恩内斯托·加利
Owner 丹尼尔恩内斯托加利
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