Lithium Silicate Adsorbent for COD Removal Without Lithium Loss
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Solution Overview
Problem
The existing wastewater treatment technologies for recycling lithium from waste power batteries face challenges in effectively removing organic matter and ammonia nitrogen from raffinate wastewater, which affects the purity of lithium hydroxide and reduces lithium concentration, due to poor biodegradability and inefficiencies in conventional treatment methods.
Innovation Solution
A lithium-silicate-based adsorbent is prepared through a method involving the mixing of butyl methacrylate, lithium silicate, and other components, followed by low-temperature dehydration and carbonization, and then treated with alcohol to enhance hydrophilicity, allowing for selective adsorption of COD without affecting lithium concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If activated carbon adsorption treatment is used to remove COD from wastewater, then COD removal efficiency is improved, but lithium concentration in the wastewater is reduced
Solution Approach 1:
The patent applies local quality by creating a adsorbent with differentiated functional zones: the outer surface provides high-affinity adsorption sites for COD removal, while the inner structure maintains lithium permeability. The hierarchical pore structure creates local variations in adsorption capacity, allowing selective removal of COD without excessive lithium uptake.
Solution Approach 2:
The patent uses composite materials by combining multiple components: lithium silicate particles provide lithium content and structural framework, while the porous polymer matrix provides adsorption sites for COD. This composite structure enables simultaneous COD removal and lithium retention through the synergistic effects of different materials.
2Device complexity
If conventional biochemical treatments are used to treat wastewater, then treatment process is simple, but organic matter and ammonia nitrogen removal is insufficient
Solution Approach 1:
The patent applies porous materials by utilizing a hierarchical pore structure with pores ranging from nanometer to micrometer scale. The porous polymer matrix provides extensive internal surface area for adsorption, enabling effective removal of organic matter and ammonia nitrogen while maintaining a relatively simple treatment process configuration.
3Object-affected harmful factors
If the adsorbent structure is enhanced for stronger adsorption capacity, then COD removal performance is improved, but hydrophilicity and mass transfer efficiency deteriorate
Solution Approach 1:
The patent applies local quality by creating differentiated functional zones within the adsorbent structure: the outer surface and pore entrances provide hydrophilic pathways for water and pollutant access, while the inner adsorption sites provide high affinity for COD. This spatial differentiation allows simultaneous optimization of hydrophilicity and adsorption capacity.
Solution Approach 2:
The patent applies dimensionality change by transitioning from a uniform adsorbent structure to a hierarchical pore structure with multiple length scales. The pore size distribution spans from nanometer to micrometer dimensions, creating transport channels at different scales that facilitate both hydrophilicity and mass transfer efficiency while maintaining high COD removal performance.
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 lithium-silicate-based adsorbent effectively removes COD from wastewater treated with flocculation, anaerobic, and anoxic processes, maintaining lithium concentration and improving adsorption performance with enhanced structural strength and hydrophilicity, thus addressing the limitations of conventional treatments.
Implementation Method 1
the lithium-silicate-based adsorbent can adsorb and remove COD in wastewater subjected to flocculation precipitation, anaerobic treatment and anoxic treatment
Implementation Method 2
subjecting the second solution to low-temperature dehydration, cooling and drying to obtain a lithium-silicate-based polymer
Implementation Method 3
carbonizing the mixture at low temperature under an anoxic condition to obtain a lithium-silicate-based adsorbent
Implementation Method 4
treated with alcohol to enhance hydrophilicity, allowing for selective adsorption of COD
Data Source
AI summary
The present invention discloses a preparation method for and the use of a lithium silicate-based adsorbent. The method comprises: mixing and stirring butyl methacrylate, an acid and an organic solvent to obtain a first solution; adding lithium silicate, an initiator and N,N′-methylenebisacrylamide into the first solution, and heating and stirring same for a reaction to obtain a second solution; subjecting the second solution to low-temperature dehydration, cooling and drying to obtain a lithium silicate-based polymer; mixing the lithium silicate-based polymer with a third solution; and subjecting same to low-temperature carbonization under anoxic conditions, so as to obtain the lithium silicate-based adsorbent, wherein the third solution is obtained by mixing cotton fibers, tartaric acid, carboxymethylcellulose and water.