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  • Lithium-specific Solvent

Lithium-specific Solvent

The principle of solvent use is primarily to accurately capture Li+ from solutions containing a variety of anions and cations, and then exchange Li+ with H+ through ion exchange, stripping it back into a solution free of other metal ions, ultimately obtaining a high-concentration lithium-rich solution. When the solvent (R) is thoroughly mixed and contacted with lithium-containing solutions, the hydrogen ions in the solvent (R) exchange with Li+ in the mother liquor as follows: R-H + Li+ → R-Li + H+. The solvent's extraction capacity for Li+ can reach over 2000mg/L. After the extraction process and oil-water separation, the raffinate in the aqueous phase is treated through oil separation, adsorption, buffering, and other stages before being discharged to meet standards. The oil phase loaded with Li+ is then stripped with a stripping agent under acidic conditions as follows: R-Li + H+ → R-H + Li+. Stripping agents can include hydrochloric acid, sulfuric acid, carbon dioxide, and water. The lithium-rich solution in the stripping liquid is then processed through crystallization, centrifugation, washing, drying, and pulverization to ultimately obtain lithium carbonate products, while the unloaded solvent returns to the front extraction stage for repeated use.
Specifications
Solvent Effective Components(%)Flash Point(℃)Density(g/cm3)Viscosity(mpa·s)Solvent Water Solubility(mg/L)Working Capacity g/LOperating Temperature ℃
>95≥80≤ 0.90≤ 4.5≤ 10>2.0>-10℃

Features of the Lithium-specific solvent:

High Selectivity:It has a high degree of selectivity for lithium ions, effectively capturing lithium ions from complex solutions (such as brine from salt lakes, lithium-containing leachates, etc.) while having relatively weak extraction capabilities for other common ions (such as sodium, potassium, magnesium, iron, calcium, etc.), thereby increasing the purity of lithium extraction.

High Extraction Efficiency:It can efficiently extract lithium ions, achieving high extraction rates under suitable conditions. For instance, the extraction rate of the lithium solvent can be over 90%.

Broad Applicability:It is suitable for various lithium-containing solution systems, including brine from salt lakes, underground brine, as well as solutions from leaching of ores, battery recycling, and other sources of lithium, meeting the needs of different types of lithium resource extraction.

Good Chemical Stability:It maintains its structure and performance stable during the extraction process, not prone to decomposition, deterioration, or other chemical reactions. It has strong reusability and a long service life. Moreover, it has minimal hydrolytic activity under strong acidic, neutral, and alkaline conditions, allowing for lithium ion extraction in various pH environments.

Easy to Strip: After extracting lithium ions into the organic phase, lithium ions can be relatively easily stripped from the organic phase into a high-concentration lithium ion aqueous solution under specific stripping conditions (such as using specific stripping agents, adjusting pH values, etc.), with a stripping rate of over 95%.

Structural Design ability: Its chemical structure can be designed and adjusted by selecting different functional groups and compositions to adapt to different lithium extraction needs and solution environments, thereby achieving optimized extraction effects. For example, different functional groups can be tailored for solvents to target specific characteristics of lithium-containing aqueous solutions.

Environmentally Friendly: The lithium solvent does not contain substances harmful to the environment, or it has minimal environmental pollution during use, in line with green chemistry and sustainable development requirements.

Rapid Oil-Water Separation: During the extraction and stripping processes, the organic and aqueous phases can separate quickly, which is beneficial for improving production efficiency and operational convenience.

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