High-Gradient Magnetic Separation of Weakly Magnetic Rare-Earth Ions

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Solution Overview

Problem

Existing separation techniques are ineffective for capturing rare-earth metal ions, which are smaller and less magnetic than superparamagnetic particles, focusing instead on microparticles.

Innovation Solution

A magnetic separation method using either a non-uniform magnetic field for a batch process or a uniform magnetic field for a flow-through process to separate paramagnetic rare-earth metal ions from diamagnetic ions, employing a magnetic or ferromagnetic mesh and an electromagnet to capture specific ions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing separation techniques are used, then microparticles that are superparamagnetic can be separated, but rare-earth metal ions cannot be captured because they are smaller and much less magnetic

Engineering Contradiction:

Improveseparation effectivenessVSAvoidapplicability to rare-earth metal ions

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The invention changes the magnetic field parameters by using high magnetic field gradients (greater than 10 T/m) that are sufficient to act on the weakly magnetic rare-earth metal ions. This parameter change enables the separation technique to work with ions that have much weaker magnetic properties than superparamagnetic particles.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces a porous magnetic material as an intermediary that enhances the magnetic field interaction with rare-earth metal ions. The porous structure provides a large surface area and magnetic field concentration points that enable capture of the weakly magnetic ions, bridging the gap between the magnetic field source and the target ions.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If traditional separation methods are used, then separation can be achieved, but the process is slow and energy-intensive

Engineering Contradiction:

Improveseparation efficiencyVSAvoidseparation time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The invention replaces traditional mechanical separation methods with a magnetic field-based separation system. This substitution eliminates the need for complex mechanical operations and reduces processing time while maintaining high separation efficiency through direct magnetic interaction with the rare-earth metal ions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention employs periodic or pulsed magnetic field application in certain embodiments, which enhances separation efficiency by creating dynamic magnetic gradients that continuously drive ion migration toward collection points, reducing overall processing time compared to static field methods.

Inventive Principle:

Principle #19Periodic action

3Reliability

If traditional separation methods are used, then separation can be performed, but environmental impact is negative due to chemical reagents

Engineering Contradiction:

Improveseparation capabilityVSAvoidenvironmental impact

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The invention replaces chemical reagent-based separation with a physical magnetic field-based system. This substitution eliminates the need for harmful chemical reagents and their associated environmental disposal issues, while maintaining effective separation capability through magnetic interaction with the rare-earth metal ions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The magnetic separation system uses the intrinsic magnetic properties of rare-earth metal ions for separation without requiring external chemical reagents. The system leverages the natural magnetic characteristics of the target ions themselves, making the process environmentally benign and eliminating reagent-related harmful factors.

Inventive Principle:

Principle #25Self-service

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

Achieves efficient separation of rare-earth metal ions with high concentration enhancement and minimal energy consumption, outperforming traditional methods in speed and environmental impact.

Implementation Method 1

generating a uniform magnetic field with a magnetic field source; generating a non-uniform magnetic field with a magnetic field source

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Implementation Method 2

The first metal ions can be paramagnetic

Methodology Applied

Scientific EffectParamagnetism: Magnetism

Implementation Method 3

the second metal ions can be diamagnetic

Methodology Applied

Scientific EffectDiamagnetism: Diamagnetism

Implementation Method 4

The mesh can be steel, such as stainless steel with ferromagnetic properties (i.e., magnetic stainless steel (or ferromagnetic stainless steel))

Methodology Applied

Scientific EffectFerromagnetism: Ferromagnetism

Data Source

PatentUS20250289004A1Magnetic based separation of rare earth metals using magnetic fields

Publication Date: 2025.09.18 FLORIDA STATE UNIV RES FOUND INC

AI summary

Systems and methods are provided for magnetically assisted separation of metal ions, such as rare-earth metal ions (e.g., dysprosium (Dy) and yttrium (Y)). A batch (or closed) process or a flow through process can be used to separate first metal ions from second metal ions in a magnetic field. The batch process can use a non-uniform magnetic field, and the flow through process can use a uniform magnetic field.