Process line for multi-recycling, low-energy and high-purity extraction of lithium

A process line for multi-recycling, low-energy and high-purity extraction of lithium, comprising steps:

• Step 1:
• Raw material solutions are pretreated for productions of precursor solutions with lithium ions, desorption agents and foreign ions;
• Step 2:
• Precursor solutions with lithium ions are processed for the first impurity separation through which first extractive liquids and second extractive liquids are produced wherein the concentrations of foreign ions in the first extractive liquids range from 0.1 to 30 ppm and the concentrations of foreign ions in the second extractive liquids range from 60 to 6,000 ppm;
• Step 3:
• The first extractive liquids are processed for separations of desorption agents through which third extractive liquids and fourth extractive liquids are produced wherein the concentrations of lithium ions in the third extractive liquids range from 1 to 150 ppm and the concentrations of lithium ions in the fourth extractive liquids range from 250 to 2,500 ppm;
• Step 4:
• The fourth extractive liquids are concentrated for productions of fifth extractive liquids and sixth extractive liquids wherein the concentrations of lithium ions in the fifth extractive liquids range from 1 to 150 ppm and the concentrations of lithium ions in the sixth extractive liquids range from 2,500 to 20,000 ppm;
• Step 5:
• The sixth extractive liquids are processed for the second impurity separation through which seventh extractive liquids and eighth extractive liquids are produced wherein the concentrations of lithium ions in the seventh extractive liquids range from 2,500 to 20,000 ppm (for solutions with high-concentration high-purity lithium ions) and the concentrations of foreign ions in the eighth extractive liquids range from 60 to 6,000 ppm.