Multi-Way Valve Brine Adsorption for Higher Lithium Adsorbent Use
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Solution Overview
Problem
Existing lithium extraction methods from salt lake brine suffer from low adsorbent utilization rates, high production costs, and inefficient processes, particularly due to the need for deep magnesium removal and complex equipment maintenance.
Innovation Solution
A continuous adsorption system utilizing a multi-way valve system is combined with lithium adsorbents, allowing for simultaneous operations in adsorption, desorption, and solution pushing, enhancing adsorbent utilization and reducing costs through a simple and efficient process flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed bed adsorption system is used for lithium extraction, then the process is simple, but the adsorbent utilization rate is low and production cost is high
Solution Approach 1:
The patent transforms the static fixed bed system into a dynamic moving bed system where adsorbent particles continuously move through different zones (adsorption zone, desorption zone, pushing zone). This dynamic configuration allows fresh adsorbent to constantly contact fresh brine, maximizing utilization and eliminating the waste of exhausted adsorbent in fixed systems.
Solution Approach 2:
The extraction system is divided into multiple functional zones: adsorption zone where lithium is captured, desorption zone where lithium is recovered, and pushing zone that moves the solution front. This segmentation allows each zone to operate optimally and continuously, improving overall adsorbent utilization compared to a single fixed bed.
2Manufacturing precision
If deep magnesium removal process is introduced, then lithium extraction selectivity improves, but process steps increase and production cost increases
Solution Approach 1:
The patent changes the chemical parameters of the brine (pH, composition) and the adsorbent properties to enhance selective lithium adsorption. By optimizing these parameters, the system achieves deep magnesium removal in a single integrated process rather than requiring multiple separate treatment steps.
Solution Approach 2:
The patent employs composite adsorbent materials that combine multiple functional components, enabling simultaneous magnesium removal and lithium adsorption in one process. This composite approach integrates what would traditionally require separate deep magnesium removal and lithium extraction steps into a unified operation.
3Productivity
If continuous adsorption system with multi-way valve is used, then adsorbent utilization increases, but equipment complexity increases
Solution Approach 1:
The moving bed system serves multiple functions simultaneously: it performs adsorption, desorption, and solution pushing in a continuous flow. The same moving adsorbent particles execute multiple tasks as they traverse different zones, reducing the need for separate equipment for each function and offsetting the complexity with operational efficiency.
Solution Approach 2:
The system maintains continuous useful action by ensuring that as one zone completes its function (e.g., adsorption), the adsorbent immediately transitions to the next zone (desorption). This continuous circulation eliminates idle time and maximizes the productive use of equipment, justifying the initial complexity through sustained high efficiency.
4Productivity
If adsorbent utilization efficiency is improved, then production cost decreases, but process complexity may increase
Solution Approach 1:
The system employs periodic cycling of adsorbent through different functional zones. The moving bed undergoes regular cycles of adsorption, desorption, and pushing phases. This periodic action pattern creates a rhythm that maximizes adsorbent utilization while maintaining a manageable and repeatable process flow that can be controlled with standard equipment.
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 increases lithium adsorbent utilization by over 20% and efficiency by 40%, while reducing production costs by 30-50% compared to fixed bed systems, with improved stability and year-round operation.
Implementation Method 1
The resin adsorption method is to use lithium ion exchange adsorbents such as titanium dioxide, metal phosphates, composite antimonates, aluminum salt type adsorbents and organic ion exchange resins to selectively treat salt lake brine with high magnesium-to-lithium ratio. The selective adsorbent is used to adsorb lithium ions
Implementation Method 2
the lithium ions are eluted to achieve the purpose of separating lithium ions from other impurity ions
Data Source
AI summary
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 (2), a desorption liquid feeding pipe (4), a low-magnesium water top desorption liquid feeding pipe (3), and an adsorption tail liquid top desorption liquid feeding pipe (11), respectively, which are located above and below a rotary disc of a multi-way valve system (1); and after respectively entering corresponding adsorption columns (6) by means of a duct and channel within the multi-way valve system (1), the entire process procedure is completed from an adsorption tail liquid discharge pipe (7), a qualified desorption liquid discharge pipe (10), a lithium-containing old brine discharge pipe (8), and an adsorption tail liquid top desorption liquid discharge pipe (5); and the adsorption columns (6) are connected in series or in parallel by means of channels located in the multi-way valve system (1). 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.