Method for efficiently extracting lithium from clay type lithium ore by utilizing pulse voltage
A technology of pulse voltage and lithium extraction, applied in the field of lithium extraction, can solve the problems of large amount of slag, high cost and large pollution in the lithium extraction process, and achieve the effects of easy handling, improved performance and high efficiency
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Embodiment 1
[0065] using as image 3 The electrolytic cell shown, the Li 2 Lithium-containing clay ore with O content of 0.52% was filled into the mineral area of the electrolytic cell, both ends were sealed with sponges, and 1 L containing 0.5 mol / L Na was injected into the anode chamber. 2 CO 3 1L aqueous solution containing 0.5mol / L NaCl was injected into the cathode chamber as the supporting electrolyte solution, and the anode and cathode chambers were inserted into graphite anode and stainless steel cathode, respectively.
[0066] A unidirectional pulse voltage was applied between the anode and the cathode, the pulse amplitude was 50V (the corresponding electric field intensity was 2.5V / cm), and the duty ratio was 30%.
[0067] Na was added to leaching agent and supporting electrolyte solution respectively during electrolysis 2 CO 3 and HCl, so that the pH of both is controlled within the range of 6 to 13.
[0068] After 72 hours of continuous electrolysis, the lithium concent...
Embodiment 2
[0070] using as image 3 The electrolytic cell shown, the Li 2 Lithium-bearing clay ores with 0.33% O content and calcite (CaCO 3 ) uniformly mixed in a mass ratio of 100:1 and moistened with water, and then filled the pretreated lithium-containing clay ore into the mineral area of the electrolytic cell, plugged with sponges at both ends, and injected 1L containing 0.1mol / LCaCl 2 and 0.5mol / L CaCO 3 The suspension is used as a leaching agent, and 1L containing 0.05mol / LK is injected into the cathode chamber. 2 SO 4 +0.05mol / L KHCO 3The aqueous solution was used as the supporting electrolyte solution, and the anode and cathode compartments were inserted into the carbon fiber cloth anode and the nickel-based coated cathode, respectively.
[0071] A unidirectional pulse voltage was applied between the anode and the cathode, the pulse amplitude was 8V (the corresponding electric field intensity was 0.4V / cm), and the duty ratio was 60%.
[0072] After 100 hours of continu...
Embodiment 3
[0074] using as image 3 The electrolytic cell shown, the Li 2 Lithium-containing clay ore with O content of 0.45% was filled into the mineral area of the electrolytic cell, both ends were sealed with sponges, and 1 L of 0.01 mol / L MgSO was injected into the anode chamber. 4 and 0.5mol / L Mg(OH) 2 The suspension is used as a leaching agent, and 1L containing 0.01mol / LNa is injected into the cathode chamber. 2 CO 3 +0.05mol / L NaHCO 3 The aqueous solution was used as the supporting electrolyte solution, and the anode compartment and cathode compartment were inserted into the ruthenium-coated titanium plate anode and the graphite cathode, respectively.
[0075] A unidirectional pulse voltage is applied between the above-mentioned anode and cathode. In one cycle, the pulse amplitude I is 100V (the corresponding electric field strength is 5.0V / cm), and the pulse width I is 1ms; the pulse amplitude II is 6V (the corresponding electric field strength is 0.3V / cm), the pulse widt...
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