Method for extracting lithium ions from brine and use of mixed titanium adsorbent for extracting lithium from brine

Abstract

A method for extracting lithium ions from brine and use of mixed titanium adsorbent for extracting lithium from brine are provided. The method for extracting lithium ions from brine comprises providing brine; providing a mixed titanium-based adsorbent, wherein the mixed titanium-based adsorbent comprises a titanium-based adsorbent mixed with a substance selected from metal cations, non-metal anions and non-metallic substances; contacting the brine with the mixed titanium-based adsorbent to form a lithium adsorbed mixed titanium-based adsorbent; and contacting the lithium adsorbed mixed titanium-based adsorbent with an acid desorption solution to form a lithium ion extraction solution.

Claims

1. A method for extracting lithium ions from brine, comprising: providing a brine, wherein the ratio of magnesium to lithium in the brine is greater than 50, the lithium concentration is less than 20 ppm, and the pH is between 8.0 and 9.0; providing a mixed-type titanium adsorbent, wherein the mixed-type titanium adsorbent comprises a titanium adsorbent mixed with a substance selected from metal cations, non-metal anions, and non-metals; contacting the brine with the mixed-type titanium adsorbent to form a lithium-adsorbed mixed-type titanium adsorbent; and contacting the lithium-adsorbed mixed-type titanium adsorbent with an acid desorption solution to form a lithium ion extraction solution.

2. The method of claim 1, wherein the magnesium-to-lithium ratio is 67:1, the magnesium concentration is 1000 ppm, the lithium concentration is 15 ppm, and the pH is 8.

5.

3. The method of claim 1, wherein the step of providing the mixed titanium adsorbent comprises: preparing the mixed titanium adsorbent into a particulate adsorbent with a particle size of 0.3 to 1.2 mm using an inorganic binder; packing the particulate adsorbent into a columnar container to a bulk density of 1.2 kg / L; and activating the columnar container with an acid solution of 10 to 30 wt% concentration and pH 1.5 to 2.0 at a flow rate of 1 to 5 times the adsorption column volume (BV) for 6 to 12 hours to obtain an adsorption column.

4. The method of claim 3, wherein the acid-activating acid solution is selected from hydrochloric acid and sulfuric acid.

5. The method of claim 3, wherein the step of forming the lithium-doped titanium adsorbent comprises passing the brine through the adsorption column at a flow rate of 5-10 BV / h, performing a single adsorption treatment and adsorption for at least 6 hours to form the lithium-doped titanium adsorbent.

6. The method of claim 1, wherein the step of forming the lithium-ion extract comprises using an acid solution with a concentration of less than 20 wt% as the acid desorption solution, and contacting it with the lithium-adsorbed mixed titanium adsorbent at a flow rate of more than 30 BV / h for at least 3 hours to form the lithium-ion extract.

7. The method of claim 6, wherein the acid desorption solution comprises hydrochloric acid.

8. A mixed-type titanium adsorbent for the extraction of lithium from brine, wherein the brine has a magnesium-to-lithium ratio of 50 or higher, a lithium concentration of less than 20 ppm, and a pH between 8.0 and 9.0, wherein the mixed-type titanium adsorbent comprises a titanium adsorbent mixed with a substance selected from metal cations, non-metal anions, and non-metals.

9. As claimed in claim 8, wherein the mixed-type titanium adsorbent comprises a mixed magnesium-titanium adsorbent.

Images