Method for extracting lithium from salt lake brine

Abstract

A new method for extracting lithium from salt lake brine, comprising the following steps: a salt lake old brine raw material, desorption liquid, low-magnesium water, and adsorption tail liquid pass through an old brine feeding pipe (), a desorption liquid feeding pipe (), a low-magnesium water top desorption liquid feeding pipe (), and an adsorption tail liquid top desorption liquid feeding pipe (), respectively, which are located above and below a rotary disc of a multi-way valve system (); and after respectively entering corresponding adsorption columns () by means of a duct and channel within the multi-way valve system (), the entire process procedure is completed from an adsorption tail liquid discharge pipe (), a qualified desorption liquid discharge pipe (), a lithium-containing old brine discharge pipe (), and an adsorption tail liquid top desorption liquid discharge pipe (); and the adsorption columns () are connected in series or in parallel by means of channels located in the multi-way valve system (). The feature in which a multi-way valve device is simple and easy to operate is utilized, and in comparison with a fixed bed operating system, the utilization rate of lithium adsorbent may be increased by over 20%, the utilization efficiency of the lithium adsorbent may be increased by over 40%, and production costs may be reduced by 30-50%. Therefore, the stability of a qualified desorption liquid is improved, stable production is guaranteed, and year-round constant operation may be achieved.