Method for extracting potassium from brine
A brine and water technology, applied in the field of potassium extraction, can solve problems such as difficult to obtain potassium chloride and difficult to separate potassium compounds
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Embodiment 1
[0079] Example 1: Adjustment of sediment by water evaporation
[0080] Prepare the following table 1 containing Na, K, SO 4 , Cl and other solutions.
[0081] [Table 1]
[0082] project
Na
K
SO 4
Cl
Concentration(g / L)
119.3
39.30
35.25
157.03
[0083] Evaporate and concentrate the above-prepared solution containing Na, K, SO 4 , Cl, etc., and detect the mineral phase and composition ratio of the precipitate precipitated according to the evaporation of water, and the results are shown in Table 2 below.
[0084] [Table 2]
[0085]
[0086]
[0087] As shown in Table 2 above, with the evaporation of brine, NaCl, KCl and NaK 3 (SO 4 ) 2 All precipitated. But it can be seen that with the amount of evaporation, potassium salts KCl, NaK 3 (SO 4 ) 2 The composition ratio has changed.
[0088] At the water evaporation up to 48.6%, in all precipitates, KCl is 11.31-13.63% by weight, NaK 3 (SO 4 ) 2 37.86~37.75% by wei...
Embodiment 2
[0092] Embodiment 2: reclaim potassium chloride from precipitate
[0093] Precipitates at 48.6% to 54.0% and 64.8 to 67.5% of evaporation were mixed and put into a solution prepared by dissolving and saturating NaCl and KCl to prepare a 5% slurry. Wherein, in the above-mentioned evaporation volume section, the KCl presents as the vast majority of potassium-containing salts.
[0094] Put 2 L of the slurry into a flotation device (flotator), add 2 mL of an aqueous surfactant solution, and perform flotation after conditioning for two minutes. The flotation time was three minutes.
[0095] The weight ratio of surfactant used to precipitated slurry was 0.2:100.
[0096] The surfactant used was sodium dodecylsulfate (SDS, sodium dodecylsulfate).
[0097] figure 2 Mineral phase representing a mixture of sodium chloride and potassium chloride and material suspended by flotation. Through the above process, the recovery rate of potassium chloride is 82%, and the suspended matter i...
Embodiment 3
[0098] Embodiment 3: potassium salt (NaK 3 (SO 4 ) 2 ) and direct precipitation of sodium chloride
[0099] Prepared the following table 3 containing Na, K, SO 4 , Cl and other solutions.
[0100] [table 3]
[0101]
[0102] Concentrate the prepared above containing Na, K, SO 4 , Cl and other solutions.
[0103] image 3 Indicates the mineral phase of the substance that is precipitated at a water evaporation rate of 37.8% when concentrated brine containing a large amount of sulfate ions, and the main mineral phases are NaCl and NaK 3 (SO 4 ) 2 , and contains a small amount of KCl.
[0104] That is to say, when making SO 4 When the brine with high content evaporates, almost no potassium chloride is precipitated, and the precipitate containing potassium is mainly NaK containing sulfate ions. 3 (SO 4 ) 2 . In weight %, the mineral composition of the precipitate is 66.03% NaCl, 4.5% KCl and 29.47% NaK 3 (SO 4 ) 2 .
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