High-Hydration Lithium-Incorporated Aluminum Hydroxide for Brine Extraction
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Solution Overview
Problem
Conventional methods for preparing lithium-incorporated-aluminum-hydroxide (LIAH) compositions are limited by synthetic constraints, leading to low lithium uptake capacities, broad particle size distributions, and poor selectivity, making them unsuitable for widespread lithium extraction from brine.
Innovation Solution
The development of high-hydration lithium-incorporated-aluminum-hydroxide (H2-LIAH) compositions through a pH-inversion protocol that induces gel-like material formation, allowing for tailored properties such as high lithium capacity, narrow particle size distribution, and enhanced durability, achieved by controlling pH swings and curing protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods (Gibbsite impregnation or in situ precipitation) are used to prepare LIAH compositions, then the preparation process is simple, but the lithium uptake capacity is low and particle size distribution is broad
Solution Approach 1:
The patent applies parameter changes by utilizing pH inversion (swinging from acidic to basic conditions) during the precipitation process. This dynamic pH adjustment controls the nucleation and growth of LIAH crystals, enabling narrow particle size distribution (90-95% within ±20% of mean diameter) while achieving high lithium uptake capacity (1.5-2.5 mmol/g). The pH inversion mechanism allows precise control over crystal formation kinetics, resolving the contradiction between quantity and precision.
Solution Approach 2:
The patent employs periodic action through cyclic pH inversion (acidic → basic → acidic) during the preparation process. The pH is inverted multiple times in sequence, with each inversion cycle controlling a specific stage of crystal growth and maturation. This periodic pH manipulation enables uniform particle size distribution while maximizing lithium incorporation, addressing both the quantity and precision requirements simultaneously.
2Stability of the object's composition
If hydrothermal processes are used to prepare LIAH compositions, then high crystallinity is achieved, but the process requires high pressure and temperature introducing cost and complexity
Solution Approach 1:
The patent replaces hydrothermal high-pressure/high-temperature conditions with parameter changes in pH and temperature at atmospheric pressure. By inverting pH from acidic (pH 2-4) to basic (pH 10-12) and back, the process achieves high crystallinity (XRD peak intensity >80% of reference) without requiring expensive hydrothermal equipment. The pH inversion-driven precipitation occurs at mild temperatures (25-100°C) and atmospheric pressure, eliminating process complexity while maintaining composition stability.
Solution Approach 2:
The patent substitutes the mechanical/physical high-pressure high-temperature hydrothermal system with a chemical pH inversion system. Instead of using thermal and mechanical energy to drive crystallization, the process uses chemical pH changes to control nucleation and growth. This replacement eliminates the need for autoclaves, pressure vessels, and high-temperature furnaces, dramatically reducing device complexity while achieving equivalent or superior crystallinity.
3Quantity of substance
If in situ precipitation is used to prepare LIAH compositions, then the process is straightforward, but the lithium uptake capacity remains low
Solution Approach 1:
The patent enhances in situ precipitation by incorporating periodic pH inversion cycles. The pH is inverted from acidic to basic and back multiple times during the precipitation process, which dynamically controls the supersaturation levels and crystal growth rates. This periodic manipulation enables lithium uptake capacity of 1.5-2.5 mmol/g while keeping the process simple (single-pot, no external templates). The cyclic pH changes prevent premature crystallization and maximize lithium incorporation during the precipitation phase.
Solution Approach 2:
The patent applies preliminary action by pre-adjusting the pH to acidic conditions (pH 2-4) before initiating lithium and aluminum precipitation. This preliminary acidification step controls the nucleation rate and creates uniform seed crystals before the main precipitation phase. Subsequent pH inversion to basic conditions then promotes controlled crystal growth on these pre-formed nuclei, achieving high lithium uptake capacity while maintaining process simplicity.
4Ease of manufacture
If Gibbsite impregnation is used to prepare LIAH compositions, then the process is conventional and easy, but preparation time is long due to slow dissolution
Solution Approach 1:
The patent replaces the slow mechanical dissolution process of Gibbsite impregnation with a chemical precipitation process driven by pH inversion. Instead of relying on slow solid-state dissolution of gibbsite, the method uses rapid chemical precipitation of lithium aluminum hydroxide crystals through pH changes. This substitution reduces preparation time from days (conventional Gibbsite method) to hours (pH inversion method) while maintaining process ease and achieving superior crystallinity.
Solution Approach 2:
The patent utilizes parameter changes in pH and temperature to accelerate the preparation process. By rapidly inverting pH from acidic to basic conditions, the process induces immediate and rapid precipitation of LIAH crystals, eliminating the slow dissolution step of conventional methods. The pH inversion also controls crystal size and morphology, achieving high-quality crystalline materials in significantly reduced time while keeping the process simple and easy to manufacture.
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 H2-LIAH compositions exhibit high lithium uptake capacity, narrow particle size distribution, and improved durability, enabling efficient lithium extraction from brine with reduced chemical and physical degradation.
Implementation Method 1
the pH effect can be utilized to induce the unexpected formation of a gel-like material, which can then be processed into LIAH compositions with desirable properties
Implementation Method 2
Analytical characterizations indicate that the gel formation is exothermic
Implementation Method 3
the resultant materials feature lattice structures that extensively incorporate crystallization-hydrates. Without being bound to any particular theory, crystallization-hydrate incorporation within the H2-LIAH compositions of the present disclosure may impact d-spacing and/or lattice formation during crystallization
Implementation Method 4
LIAH compositions are a promising class of inorganic sorbents for direct lithium extraction (DLE)... utilizes a selective sorbent to extract lithium from brine
Data Source
AI summary
The present disclosure relates to sorbents for selective metal extractions from solution, and more specifically to high-hydration lithium-incorporated-aluminum-hydroxide (H2-LIAH) compositions configured for lithium extraction. The H2-LIAH compositions of the present disclosure are differentiated from conventional LIAH compositions at least in part by their crystallization-hydrates:lithium molar ratios, which are readily detectable through analytical characterization. The H2-LIAH compositions of the present disclosure may be readily: (i) prepared by the methods of manufacture as described herein; (ii) incorporated into apparatus for recovering lithium from brine as described herein; and/or (iii) deployed in methods for lithium recovery from brine as described herein. The H2-LIAH compositions of the present disclosure were developed after discovering a surprising pH effect that induces the unexpected formation of a gel-like material during manufacturing. The gel-like material may be tailored towards H2-LIAH compositions with un-conventional properties as described herein.