Molten Salt Electro-Reduction Reactor for Coke-Free Metal Production
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Solution Overview
Problem
The existing blast furnace ironmaking process in China is energy-intensive, resource-consuming, and environmentally harmful due to the use of coke and the production of CO2 and toxic gases, with significant slag generation.
Innovation Solution
A device and method for metal preparation by electro-reduction of molten salt using a reactor with a conductive base plate and insulated peripheral wall, where the reactant and molten salt are layered, and an electrical conductor is inserted for electro-reduction, with a protective gas charging and exhaust gas removal mechanism, enabling a directional current flow and reducing the need for coke and non-renewable resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If blast furnace ironmaking process is used, then metal production is achieved, but energy consumption and resource consumption increase significantly
Solution Approach 1:
The patent replaces the thermal-chemical reduction system (blast furnace with coke) with an electrochemical reduction system (electrolytic cell with electric current). The electro-reduction process uses electrical energy to directly reduce metal oxides in molten salt, eliminating the need for coke combustion and high-temperature thermal processes, thereby significantly reducing energy consumption and resource usage.
Solution Approach 2:
The patent changes the operating parameters from high-temperature thermal reduction (above melting point of iron) to controlled electrochemical reduction at lower temperatures. By using molten salt electrolysis, the process operates at optimized temperature and voltage levels, improving energy efficiency while maintaining high metal production rates.
2Productivity
If blast furnace ironmaking process is used, then metal production is achieved, but harmful emissions including CO2 and toxic gases are produced
Solution Approach 1:
The patent substitutes the combustion-based reduction system with an electrochemical system. Instead of burning coke to produce CO and CO2 for reduction, the electro-reduction process uses direct electron transfer to reduce metal oxides, completely eliminating CO2 emissions and toxic gas generation while maintaining efficient metal production.
Solution Approach 2:
The patent converts the harmful thermal-chemical reduction process into a beneficial electrochemical process. The electricity, which can be sourced from renewable energy, replaces fossil fuel combustion, transforming a harmful emission source into a clean production method that generates no harmful emissions.
3Productivity
If blast furnace ironmaking process is used, then metal production is achieved, but slag is produced causing pollution and occupying space
Solution Approach 1:
The patent replaces the blast furnace smelting process that produces slag with an electro-reduction process in molten salt. The electrochemical reduction occurs in a controlled environment where metal oxides are reduced to pure metal, and the molten salt serves as a reusable electrolyte, eliminating slag formation and associated pollution and space occupation issues.
4Object-generated harmful factors
If electro-reduction of molten salt is used, then energy consumption and pollution are reduced, but process complexity increases
Solution Approach 1:
The patent employs a reactor design where the reactor body itself serves multiple functions: it contains the molten salt electrolyte, provides the cathode surface for metal deposition, and facilitates electrical conduction. This multi-functionality simplifies the overall process by eliminating the need for separate containment vessels, electrode support structures, and cooling systems, thereby reducing operational complexity despite the advanced chemistry involved.
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 enhances current efficiency, reduces energy consumption, minimizes environmental pollution, and lowers costs by eliminating the need for coke and slag production, while operating at lower temperatures.
Implementation Method 1
switching on the power supply to perform a molten salt electro-reduction reaction
Implementation Method 2
heating the reactor until the molten salt substance melt
Implementation Method 3
the gas charging and discharging mechanism is configured to continuously charge a protective gas into the reactor while removing an exhaust gas
Data Source
AI summary
A device and a method for metal preparation by electro-reduction of a molten salt are provided. The device includes a reactor, an electrical conductor, a power supply, a gas charging and discharging mechanism, and a closure mechanism; the reactor is a barrel body with a conductive base plate and an insulated peripheral wall and opens at one end, a barrel cavity of the reactor is configured to lay down a reactant and a molten salt substance; the electrical conductor is configured to be inserted into the molten salt substance; the reactor and the electrical conductor are disposed inside the closure mechanism; a positive pole of the power supply is electrically connected to the electrical conductor, and a negative pole is electrically connected to the conductive base plate; the gas charging and discharging mechanism is configured to continuously charge a protective gas into the reactor while removing an exhaust gas.