Spherical Lithium Adsorbent Granulation for High-Capacity Column Filling
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Solution Overview
Problem
Existing lithium ion adsorbents in powder form face issues with increased column pressure, difficulty in recovery, reduced adsorption capacity due to compacted pore channels, and high costs associated with polymer-based granulation methods, which affect their performance and stability.
Innovation Solution
A method involving dry mixing of adsorbent and forming agent with a solvent, adding a thickening and pore-forming agent, and spraying the mixture into an incompatible solvent to form spherical lithium adsorbents via phase conversion, optimizing particle size and specific surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct extrusion molding is used to granulate adsorbent powders, then granulation efficiency is improved and particles are formed, but particle compactness becomes too high which compresses pore channels and reduces adsorption capacity
Solution Approach 1:
The invention changes the granulation parameters by using spray granulation instead of extrusion molding, controlling particle size distribution (0.1-1.0 mm) and forming a porous structure with specific pore volume (0.2-0.5 mL/g) that maintains both granulation efficiency and adsorption capacity
Solution Approach 2:
The invention creates a porous granulated adsorbent structure with controlled pore volume and specific surface area, where the porous structure is formed through spray drying process that creates internal voids and channels, preventing pore channel compression while maintaining particle integrity
2Manufacturing precision
If polymerization granulation is used to wrap adsorbent powders, then particle size and pore structure can be controlled, but the proportion of polymer skeleton material becomes too high which reduces the adsorption performance
Solution Approach 1:
The invention extracts the polymer binding function from the granulation process itself, using spray granulation where liquid binder is applied during particle formation rather than relying on polymer matrix, thereby reducing polymer content to minimal necessary amounts while maintaining particle integrity
Solution Approach 2:
The invention creates a composite structure where inorganic adsorbent particles are combined with minimal organic binder in a specific ratio, forming a composite granulated adsorbent that maintains high inorganic content (90-99 wt%) for adsorption performance while providing sufficient binding strength
3Manufacturing precision
If electrostatic spray granulation is used to prepare spherical adsorbents, then particle size is controllable and spherical shape is achieved, but the device required is complicated and cost is expensive
Solution Approach 1:
The invention replaces the complex electrostatic field system with a simpler mechanical spray drying system, using conventional spray granulation equipment that uses mechanical atomization and airflow drying instead of electrostatic charging and collection mechanisms
Solution Approach 2:
The invention uses a multi-functional spray granulation device that can control particle size through spray parameters (nozzle type, pressure, temperature) and form spherical particles simultaneously, achieving multiple functions (atomization, drying, spherical formation, size control) in a single simple process
4Ease of manufacture
If inorganic compound powders are directly used for ion exchange column filling, then no granulation process is needed, but column pressure increases and the powders are difficult to recover
Solution Approach 1:
The invention segments the fine inorganic powder particles into larger granulated particles with controlled size distribution (0.1-1.0 mm), where the segmentation process groups fine particles into larger aggregates that maintain porosity and reduce packing density, thereby reducing column pressure while improving recoverability
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 produces spherical adsorbents with adjustable sizes suitable for industrial use, high adsorption capacity, and resistance to acids and bases, reducing production costs and enhancing stability.
Implementation Method 1
spraying out the mixed system from a nozzle of a spray device and receiving sprayed drips using a second solvent that is incompatible with the forming agent as a receiving solvent so that a solid-phase spherical lithium adsorbent is obtained via phase conversion
Data Source
AI summary
A spherical lithium adsorbent, as well as a preparation method and use thereof are provided. The preparation method includes: dry mixing an adsorbent and a forming agent followed by evenly mixing with a first solvent to form a mixed solution, and adding a thickening and pore forming agent to obtain a mixed system; spraying out the mixed system from a nozzle of a spray device and receiving sprayed drips using a second solvent that is incompatible with the forming agent as a receiving solvent so that the drips become particles to obtain a spherical adsorbent with good performance and even granularity. Spray granulation is performed utilizing airflow so that the particles have a larger specific area and are more suitable for industrial absorption column filling. Furthermore, adsorbent powders in the particles are tightly wrapped and difficult to fall off during cyclic use.