Nickel Solvent Extraction Under Lithium Salt Solubility Limits
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Solution Overview
Problem
The generation of precipitates during the extraction of nickel ions from a metal-containing solution containing nickel and lithium ions using solvent extraction methods interferes with the smooth operation, often requiring interruption.
Innovation Solution
The method involves adjusting the lithium ion concentration in the metal-containing solution and pH adjusting agent to ensure the total concentration remains below the solubility limit of lithium salts, preventing local excess and precipitate formation during nickel ion extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If solvent extraction method is used to extract nickel ions from metal-containing solution, then nickel ions can be separated from other metal ions, but precipitates are generated that inhibit smooth operation
Solution Approach 1:
The patent applies parameter changes by controlling the lithium ion concentration in the metal-containing solution and pH adjusting agent to ensure their total concentration remains below the solubility limit of lithium salts. This parameter control prevents local excess lithium concentration that would cause precipitate formation, thereby maintaining operation continuity while achieving nickel ion separation through solvent extraction
2Productivity
If pH adjusting agent containing lithium ions is added to adjust equilibrium pH during nickel extraction, then nickel ion extraction efficiency is improved, but local excess lithium concentration causes precipitate formation
Solution Approach 1:
The patent controls the concentration parameters of lithium ions in both the metal-containing solution and pH adjusting agent. By ensuring their total concentration stays below the solubility limit of lithium salts, the method maintains efficient nickel ion extraction while preventing the harmful effect of precipitate formation that would otherwise occur from local lithium excess
Solution Approach 2:
The patent uses the solubility limit of lithium salts as an intermediary threshold to mediate between the need for lithium-containing pH adjusting agents (for efficient nickel extraction) and the need to avoid precipitates. By monitoring and controlling lithium concentration against this threshold, the method achieves both extraction efficiency and precipitate-free operation
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
This approach effectively suppresses the generation of precipitates, allowing for a stable and continuous extraction process by maintaining the lithium ion concentration below the solubility threshold, thereby ensuring operational continuity.
Implementation Method 1
the metal-containing solution is brought into contact with a solvent, and a predetermined metal ion among multiple types of metal ions in the metal-containing solution is extracted from the metal-containing solution into the solvent
Implementation Method 2
adjusting an equilibrium pH using a pH adjusting agent containing lithium ions
Data Source
AI summary
A method for recovering metals from a metal-containing solution containing nickel ions, lithium ions, and anions of an inorganic acid, the method including: a nickel extraction step including extraction that mixes the metal-containing solution with a solvent while adjusting an equilibrium pH using a pH adjusting agent containing lithium ions, transfers the nickel ions in the metal-containing solution to the solvent, and separates the solvent containing the nickel ions from an extracted solution, wherein in the nickel extraction step, the extraction is carried out under conditions where the total of a lithium ion concentration of the metal-containing solution and a lithium ion concentration of the pH adjusting agent is less than or equal to a lithium ion concentration of a saturated solution of a lithium salt made of the anions of the inorganic acid and the lithium ions contained in the metal-containing solution.