Lithium Hydroxide Extraction via Sequential Two-Base Precipitation
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Solution Overview
Problem
Existing methods for extracting lithium hydroxide from lithium-containing materials, such as black mass from recycled batteries, are energy-intensive, environmentally harmful, and result in contaminated products with reduced market value due to high impurity levels.
Innovation Solution
A two-step precipitation process using different bases to isolate insoluble metals and the conjugate base of the acid, followed by lithium hydroxide recovery, reduces impurities and enhances the purity and resale value of the recovered materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-step precipitation method using metal hydroxides is used to recover lithium, then the process is simplified and productivity is improved, but the product purity deteriorates due to contamination with barium or calcium sulfate precipitates
Solution Approach 1:
The single-step precipitation process is divided into two sequential steps: first precipitating insoluble metals (nickel, cobalt, manganese) using sodium hydroxide, then separately precipitating sulfate compounds using barium hydroxide or calcium hydroxide. This segmentation allows each precipitation step to target specific impurities, preventing contamination of the lithium hydroxide product while maintaining process efficiency.
2Ease of manufacture
If traditional leaching-precipitation method with sodium hydroxide is used, then the process is well-established and ease of manufacture is improved, but loss of substance worsens due to sodium remaining in solution with lithium requiring additional removal steps
Solution Approach 1:
The method extracts and removes sodium from the solution before the final lithium hydroxide precipitation step. By removing sodium early in the process, the subsequent addition of barium hydroxide or calcium hydroxide does not introduce additional alkali metal contamination, resulting in higher purity lithium hydroxide product without requiring complex removal steps.
3Manufacturing precision
If energy-intensive electrolytic methods are used to produce lithium hydroxide, then product purity is improved, but use of energy worsens significantly
Solution Approach 1:
The method changes the chemical parameters of the solution through controlled precipitation steps, adjusting pH and ion concentrations to selectively precipitate impurities while keeping lithium in solution. This chemical approach replaces energy-intensive electrolytic methods, achieving high purity lithium hydroxide through thermodynamically favorable precipitation reactions rather than energy-consuming electrochemical processes.
4Quantity of substance
If lithium is extracted from mined ores or brine, then supply demand is met, but object-affected harmful factors worsen due to environmental impact including water consumption and landscape scarring
Solution Approach 1:
The method recovers lithium from discarded lithium-ion batteries through chemical leaching and precipitation, transforming waste material into valuable lithium hydroxide product. This recycling approach eliminates the need for environmentally damaging mining and brine extraction operations, meeting lithium supply demands while avoiding landscape scarring, water consumption, and ecosystem disruption associated with primary extraction methods.
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 higher purity lithium hydroxide production with reduced environmental impact and lower reagent costs by isolating valuable metals in separate streams, making the process more economical and environmentally friendly.
Implementation Method 1
a dissolution step comprising treating the lithium-containing solid with an acid to obtain to obtain a dissolution step liquor
Implementation Method 2
a first precipitation step comprising adding a first base to said dissolution step liquor to precipitate metal products as a first precipitate
Implementation Method 3
a second precipitation step comprising adding a second base to the first precipitation step liquor to precipitate compounds containing the conjugate base of the acid as a second precipitate
Implementation Method 4
The resultant lithium hydroxide solution can then be dried or subjected to a further precipitation to recover lithium hydroxide solution
Implementation Method 5
The resultant lithium hydroxide solution can then be dried or subjected to a further precipitation to recover lithium hydroxide solution
Data Source
AI summary
A method of extracting lithium hydroxide from a lithium containing solid such as lithium ore or lithium batteries. The problem addressed by the invention is the provision of an extraction method where non-lithium components are removed sequentially rather than concomitantly. The method of the invention includes the sequential steps of: dissolving the lithium-containing solid in an acid, precipitating non-lithium metal products using a first base, precipitating the conjugate base of said acid using a second base, and isolating lithium hydroxide from the resultant solution.