Powdered Metal Oxide Electrolysis With Solid Oxygen-Ion Electrolyte
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Solution Overview
Problem
Existing electrolysis methods for extracting metal and oxygen from powdered metal oxides face challenges in achieving complete reduction and easy separation of metal powder, often requiring high temperatures that can cause sintering, melting, or evaporation, and involve complex separation steps with molten salt electrolytes.
Innovation Solution
A method using a solid oxygen-ion conducting electrolyte powder with nanoparticles surrounding metal oxide particles in an electrolytic cell, allowing for electrochemical reduction at moderate temperatures and enabling easy separation of metal powder from the electrolyte without altering its grain size distribution, facilitated by a conducting path for oxygen ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If molten salt electrolytes are used in existing electrolysis devices, then electrochemical reduction of metal oxides can be achieved, but the metal powder becomes embedded in the salt electrolyte requiring complex separation steps
Solution Approach 1:
The patent extracts the metal powder from the electrolyte system by using a solid electrolyte that does not dissolve metal powders, allowing simple gravity-based separation. The solid electrolyte powder remains in the reactor while the metal powder can be easily removed through filtration or decantation, eliminating the complex separation steps required when using molten salt electrolytes.
Solution Approach 2:
The patent changes the physical state of the electrolyte from liquid (molten salt) to solid (solid electrolyte powder), which fundamentally alters the interaction between the electrolyte and metal powder. This parameter change prevents the metal powder from being embedded in the electrolyte, enabling simple separation while maintaining electrochemical reduction efficiency.
2Productivity
If high temperatures (700-1400°C) are used in electrolysis devices, then electrochemical reduction can proceed, but technologically interesting metals may sinter, melt, or evaporate
Solution Approach 1:
The patent changes the operating temperature parameter from high temperature (700-1400°C) to moderate temperature range, which prevents sintering, melting, or evaporation of the metal powder while maintaining sufficient electrochemical reduction rates. This parameter change preserves the grain size distribution and physical properties of the metal powder product.
Solution Approach 2:
The patent uses a composite system consisting of solid electrolyte powder mixed with metal oxide feedstock. This composite structure enables the electrochemical reduction to proceed at moderate temperatures by providing adequate ionic conductivity and reaction pathways, eliminating the need for high temperatures that would compromise metal powder quality.
3Reliability
If solid oxygen-ion conducting electrolyte powder is used, then complete reduction and easy separation are achieved, but the electrolyte powder may be consumed or require replacement
Solution Approach 1:
The solid electrolyte powder is designed to be reusable and not consumed during the electrolysis process. It maintains its structural integrity and ionic conductivity over multiple cycles, serving the electrolyte function without requiring replacement. This self-service characteristic eliminates continuous electrolyte consumption while maintaining process robustness.
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 produces high-purity metal powder and oxygen simultaneously, with improved reaction rates and reduced complexity in separation, enhancing the robustness and efficiency of the electrolytic process.
Implementation Method 1
providing a solid oxygen ion conducting electrolyte powder into a container... the cathode being in communication with the electrolyte powder and the anode being in communication with the membrane in communication with the electrolyte powder
Implementation Method 2
applying an electric potential across the cathode and the anode... such that at least one respective metallic species of the at least one metal oxide is reduced at the cathode and oxygen ions are oxidized at the anode to form molecular oxygen
Data Source
AI summary
A method for extracting metal and oxygen from powdered metal oxides in electrolytic cell is proposed, the electrolytic cell comprising a container, a cathode, an anode and an oxygen-ion-conducting membrane, the method comprising providing a solid oxygen ion conducting electrolyte powder into a container, providing a feedstock comprising at least one metal oxide in powdered form into the container, applying an electric potential across the cathode and the anode, the cathode being in communication with the electrolyte powder and the anode being in communication with the membrane in communication with the electrolyte powder, such that at least one respective metallic species of the at least one metal oxide is reduced at the cathode and oxygen is oxidized at the anode to form molecular oxygen, wherein the potential across the cathode and the anode is greater than the dissociation potential of the at least one metal oxide and less than the dissociation potential of the solid electrolyte powder and the membrane.