Continuous Lithium-Sodium Separation With Multi-Column Resin Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium-sodium separation processes in lithium carbonate production suffer from incomplete separation of lithium and sodium, low recovery rates, and high operational costs, with recovery rates typically below 50% and significant losses in the production process.
Innovation Solution
A continuous lithium-sodium separation method using a multi-way switching valve system with series or parallel connected resin columns, incorporating adsorption, first washing, desorption, and second washing steps, allowing for simultaneous operation and efficient lithium recovery through a combination of different washing and desorption solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional evaporation and precipitation methods are used for lithium-sodium separation, then the process is simple to operate, but the recovery rate is low (only 50%) and lithium loss is significant
Solution Approach 1:
The continuous ion exchange device is divided into multiple resin columns (first resin column, second resin column, third resin column, etc.) that operate in sequence through different stages (adsorption, washing, desorption, regeneration). This segmentation allows simultaneous operation of multiple columns, achieving continuous processing while maintaining high lithium recovery rates exceeding 95%.
Solution Approach 2:
The device implements continuous lithium-sodium separation through coordinated operation of multiple resin columns at different processing stages. While one column performs adsorption, another performs washing, another desorption, and another regeneration, ensuring uninterrupted lithium recovery operations and eliminating idle time between batches.
2Loss of substance
If multiple washing and desorption steps are implemented to improve separation efficiency, then lithium recovery rate increases to over 95%, but device complexity increases due to multi-way switching valve system
Solution Approach 1:
The multi-way switching valve system serves multiple functions simultaneously: it directs feed solution to appropriate resin columns, routes washing solutions through correct columns, controls desorption solution flow, and manages barren liquid discharge. This multi-functionality consolidates what would otherwise require separate valve systems into a single integrated control mechanism.
Solution Approach 2:
The system employs periodic switching of the multi-way switching valve to sequentially direct different solutions (feed solution, washing solution, desorption solution) through different resin columns at timed intervals. This periodic action coordinates the cyclic operation of adsorption, washing, desorption, and regeneration stages across multiple columns.
3Productivity
If resin columns are operated in continuous cycles with multiple stages, then productivity increases through no-stop operation, but operational control complexity increases
Solution Approach 1:
The system incorporates automatic control mechanisms that monitor the operational state of each resin column and adjust the multi-way switching valve accordingly. This feedback control ensures that each column transitions through adsorption, washing, desorption, and regeneration stages at the appropriate times, maintaining continuous operation while simplifying control through automated decision-making based on system state.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves lithium recovery rates exceeding 95%, improves resin utilization by 20% or more, enhances resin efficiency by 40% or more, and reduces production costs by 30-50%, while enabling year-round no-stop operation and minimizing water consumption and waste discharge.
Implementation Method 1
a new method for lithium-sodium separation, in particular to a continuous ion exchange device that absorbs lithium ions from a sodium chloride-containing solution
Implementation Method 2
continuous ion exchange device that absorbs lithium ions from a sodium chloride-containing solution
Implementation Method 3
the steps of adsorption, first washing, desorption, second washing and pushing back water by adsorption barren liquid are run simultaneously through automatic control
Implementation Method 4
the steps of adsorption, first washing, desorption, second washing and pushing back water by adsorption barren liquid are run simultaneously
Data Source
AI summary
Disclosed is a new continuous lithium-sodium separation method. A lithium-sodium separation mother solution, a first leacheate, a desorption solution, a second leacheate and a lithium-sodium separation adsorption tail solution respectively pass through a lithium-sodium separation mother solution feeding pipe (2), a first leacheate feeding pipe (3), a desorption solution feeding pipe (4), a second leacheate feeding pipe (5) and an adsorption tail solution top desorption solution feeding pipe (6) that are located above and below a rotary disc of a multi-way change-over valve system (1), respectively enter corresponding resin columns (7) by means of pore channels and channels in the multi-way change-over valve system (1), and then are discharged from an adsorption tail solution discharging pipe (8), a first leacheate discharging pipe (9), a qualified liquid discharging pipe (10), a second leacheate discharging pipe (11) and an adsorption tail solution top desorption solution discharging pipe (12), so as to complete the whole technological process, wherein the resin columns (7) are connected in series or in parallel by means of the channels located in the multi-way change-over valve system (1). The method is simple and easy to operate, the resin utilization rate is improved by 20% or more, the efficiency is improved by 40% or more, and the production cost can be reduced by 30-50%. The production reliability is improved, and all-year continuous operation can be realized.