Method for extracting lithium from lithium-containing solution
A lithium solution and lithium extraction technology, applied in chemical instruments and methods, extraction water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as difficult recovery of lithium carbonate and extraction of lithium, and achieve high recovery rate , the effect of efficient extraction
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Embodiment 1
[0165] Example 1: Concentration of brine containing carbonate ions and solid-liquid separation of the precipitate
[0166] Prepare Li, Na, K, SO according to the following table 1. 4 , Cl, CO 3 And other solutions.
[0167] [Table 1]
[0168]
[0169] For the prepared above containing Li, Na, K, SO 4 , Cl, CO 3 Etc., using an evaporation concentrator, and evaporating under reduced pressure at a temperature of 40°C.
[0170] figure 1 The data shows the change in the concentration of lithium ions in the filtrate with the amount of water evaporation when the brine is concentrated.
[0171] When the brine is concentrated, as the water evaporates, the lithium concentration in the brine starts to rise from the initial 1.04 g / L, and increases to 1.80 g / L when the water evaporation is 37.8%.
[0172] However, when the evaporation of water is greater than or equal to 37.8%, even if the brine is concentrated, the lithium concentration does not increase because lithium in the brine is precipitated...
Embodiment 2
[0175] Example 2: Extraction of lithium phosphate from concentrated brine
[0176] The following Table 2 shows the dissolved ion concentration in the filtered solution after evaporating 37.8% of the water in the brine containing a large amount of carbonate ions.
[0177] [Table 2]
[0178]
[0179] The lithium concentration of the concentrated filtered solution is 1.8 g / L, and after adding phosphoric acid equivalent to the lithium concentration, the lithium concentration at different times is measured at room temperature.
[0180] figure 2 The data showing the change of lithium concentration in brine with time after phosphoric acid is added.
[0181] Such as figure 2 As shown, the lithium concentration started at 1.8 g / L and gradually decreased with the passage of time, and when the reaction time was 3 hours, the lithium concentration was 0.4 g / L, and the lithium recovery rate was 77.7%.
[0182] image 3 Shows the result of mineral phase analysis of the precipitate after the reaction...
Embodiment 3
[0183] Example 3: Concentrate the filtered solution again and extract lithium phosphate using nuclear particles
[0184] The brine from which the lithium has been extracted is concentrated again to a range where no lithium is precipitated. The main mineral phases of the precipitate are NaCl, KCl and NaK 3 (SO 4 ) 2 .
[0185] The following Table 3 shows the composition of the filtered solution when the amount of water evaporated is 60%.
[0186] [table 3]
[0187] project
Li
Na
K
SO 4
CO 3
Cl
Concentration (g / L)
0.877
143.1
74.6
21.0
67.9
156.5
[0188] In order to extract lithium from the solution, lithium phosphate was added as a core particle (seed) to 1 equivalent of the dissolved lithium without adding water-soluble phosphoric acid at this time, and then the lithium concentration at different times was measured.
[0189] Figure 4 The data shows the change of the lithium concentration in the salt water with time after the nuclear particles are added. After 2 hours of reaction,...
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