UC936 Lithium Extractant

1. Product Introduction

UC936 Lithium Extractant Mainly used for extraction under alkaline conditions Li ⁺ , in order to achieve Li/Na、Li/K separation and concentration Li ⁺ to realize efficient and low-carbon comprehensive utilization of lithium resources.

2. Basic Physicochemical Properties

   Appearance	Colorless to pale yellow liquid
   Density ( 25℃ )	0.83 – 0.86 g/cm³ 3
   Viscosity ( 25℃ )	10 – 15 mPa·s
   Solubility in Water	21 μg/mL (pH = 3.0) 36 μg/mL (pH = 12.0)
   Boiling Point ( 760 mmHg )	> 190℃
   Flash Point (Closed Cup)	> 80℃

3. Extraction Performance

   1. Extraction Rate -pH Curve

3. 2. Basic Extraction Parameters

      Lithium Saturation Capacity	Approximately 2.8 g/L
      Optimal Operating Temperature	25 – 40℃
      Extraction pH Range	11.0 – 13.5
      Extraction Phase Separation Time	< 120 s
      Stripping Agent	H₂SO₄、HCl、HNO₃、H₃PO₄、H₂CO₃
      Stripping Phase Separation Time	< 120 s
      Extraction Equipment	Centrifugal extraction tank or mixed clarifying tank

       

       
   3. Outstanding Advantages of Youcui 936的突出优点
      1. High chemical stability, low water solubility;
      2. High efficiency: Youcui 936 has fast phase separation speed during lithium extraction and stripping processes, with funnel test phase separation time within 1 min ;
      3. Adjustable saturation capacity: according to the characteristics of the feed solution, Youcui's 936 saturation capacity ranges from 1.5 – 2.8 g/L adjustable range;
      4. Li/Na High separation factor: Youcui 936 has high selectivity for Li ⁺ , and through extraction, washing, and stripping processes, the concentration of Li ⁺ in the stripping solution can reach 20 g/L or above, Li/Na with a concentration ratio greater than 10。
4. Application Fields
   1. Lithium recovery from lithium sediment mother liquor: the mother liquor for lithium carbonate production contains about 1.5 – 2.0 g/L of lithium and a large amount of Na ⁺ (generally higher than 80 g/L ), with very low content of other metal ions. Therefore, lithium sediment mother liquor is a high-quality secondary lithium resource with important recovery value. Traditional methods for treating lithium sediment mother liquor include neutralization - evaporation concentration (chloride system) or neutralization - evaporation concentration - and freeze crystallization (sulfate system). Due to the low lithium concentration in the lithium sediment mother liquor, the evaporation concentration process consumes high energy and has a long production cycle, and sodium ions cannot be separated, resulting in very high sodium ion content, which causes great difficulty for further lithium utilization. Freeze crystallization can precipitate some sodium sulfate, reducing the sodium proportion in the mother liquor, but it also consumes high energy and the precipitated sodium sulfate contains a considerable amount of lithium, resulting in low lithium recovery rate. UC936 lithium extractant has a high extraction rate for Li ⁺ under alkaline conditions, but a low extraction rate for Na ⁺ . Using extraction, washing, and stripping processes, efficient separation of Li/Na and concentration of lithium can be achieved, obtaining a lithium salt solution with higher concentration, which can be further used for lithium carbonate production, providing good economic benefits.
   2. Lithium extraction from carbonate-type brine: Tibet region has unique carbonate-type lithium salt lakes such as Zabuye, Dangxiongcuo, Bangecu, and Jiezecaka, characterized by low magnesium to lithium ratio or almost no magnesium ions. After concentration, lithium content is about 1.0 – 2.0 g/L In this solution, a small amount of sodium carbonate and sodium hydroxide is added to remove Ca ²⁺ 、 Mg ²⁺ Afterwards, the solution is alkaline and UC936 lithium extractant can be used Through extraction, washing, and back-extraction processes, achieve Li ⁺ extraction and concentration of Li ⁺ and Na ⁺、 K ⁺ separation.
   3. Lithium extraction from lithium-ion battery recycling tail liquid: With the continuous popularization of new energy batteries, the amount of waste lithium-ion batteries is increasing year by year. Waste lithium-ion batteries contain a large amount of valuable metals and are high-grade secondary metal resources. Their recycling has huge economic and environmental benefits. Currently, the most widely used are ternary lithium-ion batteries (with cathode materials of nickel-cobalt-manganese lithium) and lithium iron phosphate batteries. The recycling process of ternary lithium-ion batteries mainly includes: disassembly - roasting - acid leaching - chemical impurity removal - extraction impurity removal - Extraction recovers major metal ions (such as nickel, cobalt, manganese), and the final tail liquid is a mixture of lithium sulfate and sodium sulfate, with lithium approximately 2.0 – 4.5 g/L which has important economic value. The recycling process of lithium iron phosphate batteries mainly includes: disassembly - roasting - acid leaching - chemical impurity removal - synthesis of iron phosphate, and the final tail liquid is also a mixture of lithium sulfate and sodium sulfate. Efficient recovery and separation of lithium from tail liquid containing lithium sulfate and sodium sulfate has always been a challenge. Traditional methods involve evaporative concentration followed by freeze crystallization, which consumes a lot of energy, has poor lithium-sodium separation, and low recovery rates. / Using Youcui 936 lithium extractant, through extraction, washing, and back-extraction processes, efficient lithium extraction and lithium-sodium separation can be achieved at room temperature, concentrating lithium to obtain a lithium sulfate solution with higher concentration and purity, which can be further used for producing lithium carbonate, lithium hydroxide, or metallic lithium products. / Electrolytic aluminum lithium-containing waste electrolyte lithium extraction: In aluminum electrolysis production, adding lithium fluoride and other salt additives to the electrolyte can improve electrolyte properties, increase current efficiency, and reduce energy consumption; moreover, with the rapid development of the aluminum electrolysis industry, high-grade bauxite resources are gradually depleted, and low-grade bauxite must be used extensively. Low-grade bauxite usually contains lithium, which accumulates in the electrolyte along with alumina raw materials in the electrolysis cell, resulting in high lithium content in the electrolyte. These two reasons cause the lithium content in waste electrolytes from aluminum electrolysis plants to be very high, far exceeding that in spodumene ore. The lithium recovery process from waste electrolytic aluminum electrolyte mainly involves dissolving it with sulfuric acid, then precipitating aluminum with sodium hydroxide, preparing the obtained aluminum hydroxide into cryolite, and the lithium content in the alkaline solution after aluminum precipitation can reach
   4. 1.5 – 4.0 g/L which is a high-quality lithium resource. Using Youcui sodium separation, and lithium concentration can be achieved, obtaining a lithium sulfate solution with higher concentration and purity, which can be further used for producing lithium carbonate, lithium fluoride, lithium hydroxide, or metallic lithium products. 936 lithium extractant, through extraction, washing, and back-extraction processes, efficient lithium extraction and lithium-sodium separation can be achieved at room temperature, concentrating lithium to obtain a lithium sulfate solution with higher concentration and purity, which can be further used for producing lithium carbonate, lithium hydroxide, or metallic lithium products. / Other lithium-containing solutions.
   5. 其他含锂溶液。