| 摘要 |
FIELD: industrial inorganic chemicals. SUBSTANCE: brine is set free from alkali metals, magnesium, and alkali-earth metals by way of passing through brine layer lithium selective inorganic sorbent. Sorbed lithium chloride is washed away with water and simultaneously concentrated 10-20-fold (residual content of alkali and alkali-earth metals do not exceed 0.05 g/l). Resultant lithium chloride solution is converted in electrodialysis apparatus at current density 0.5-2.3 A/sq.dm into lithium hydroxide solution. The latter is concentrated in electrodialysis apparatus and partially evaporated to give LiOH•HO (or LiCO) crystals. Summary impurity content in dry product does not exceed 0.113%. Method is applicable to any chloride solutions with high sodium, magnesium, and calcium content. EFFECT: achieved simplicity and versatility of procedure. |
