Molten Salt Electrolysis for Titanium Metal Production
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Solution Overview
Problem
Current methods for producing titanium metal, such as the magnesiothermic reduction process and molten salt electrolysis, face challenges like high energy consumption, long production periods, and high manufacturing costs due to the need for vacuum and high-temperature processes, as well as the use of expensive materials like titanium dioxide.
Innovation Solution
A method involving mixing titanium-containing materials like high titanium slag or rutile with a carbonaceous reducing agent, followed by pre-electrolysis and electrolysis in an inert atmosphere using alkali or alkaline earth metal chloride molten salts, to produce titanium metal powder with controlled current densities and ratios of oxygen to carbon, reducing energy consumption and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum and high-temperature processes are used to prepare solid solution anode, then titanium metal can be produced through electrolysis, but energy consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-mixing titanium-containing material with carbonaceous reducing agent and conducting thermal reduction before electrolysis. This preliminary thermal treatment converts TiO2 into a reduced state that can directly participate in electrolysis without requiring vacuum conditions, thereby reducing energy consumption while maintaining titanium metal purity
Solution Approach 2:
The patent changes the physical and chemical parameters of the anode material by using carbonaceous reducing agents to reduce TiO2 in situ. This parameter change allows the electrolysis process to proceed at lower temperatures and without vacuum conditions, resolving the contradiction between manufacturing precision and energy consumption
2Manufacturing precision
If titanium dioxide is used as raw material with carbon and high-temperature vacuum reaction, then solid solution anode TiO.mTiC is obtained, but production cost increases
Solution Approach 1:
The patent uses carbonaceous reducing agents (coal powder, coke powder, activated carbon, graphite, carbon black, or petroleum coke) as disposable materials that react with TiO2 during the process. These inexpensive carbon materials replace expensive vacuum equipment and high-temperature furnaces, significantly reducing production cost while maintaining anode quality
Solution Approach 2:
The patent replaces the mechanical vacuum system with a chemical reduction system using carbonaceous agents. Instead of using vacuum equipment to create the reaction environment, the patent uses chemical reactions between carbon and TiO2 to achieve the same effect, thereby reducing equipment cost and simplifying the manufacturing process
3Productivity
If composite anode TiCxOy is prepared by thermal reduction under vacuum and high temperature, then molten salt electrolysis can be performed, but energy consumption remains high
Solution Approach 1:
The patent merges the thermal reduction step with the electrolysis process by conducting both operations in the same molten salt electrolyte system. The carbonaceous reducing agent is mixed with titanium-containing material before electrolysis, and the reduction and electrolysis occur simultaneously or sequentially in the same apparatus, eliminating the need for separate vacuum thermal reduction equipment and reducing energy consumption
Solution Approach 2:
The patent uses composite anode material formed by mixing titanium-containing material with carbonaceous reducing agent in specific ratios. This composite structure allows in-situ reduction during electrolysis, eliminating the need for pre-preparation under vacuum and high temperature, thereby maintaining electrolysis efficiency while reducing energy consumption
4Manufacturing precision
If magnesiothermic reduction process is used with multiple steps including vacuum distillation, then sponge titanium is produced, but production period becomes long
Solution Approach 1:
The patent applies preliminary action by pre-mixing titanium-containing material with carbonaceous reducing agent in specific ratios before electrolysis. This preliminary preparation eliminates the need for multiple subsequent steps including vacuum distillation, directly producing titanium metal powder in a single electrolysis process and significantly shortening the production period while maintaining titanium purity
Solution Approach 2:
The patent achieves continuity of useful action by conducting thermal reduction and electrolysis in a continuous manner within the same molten salt system. The carbonaceous reducing agent continuously reduces TiO2 during electrolysis, and titanium metal continuously deposits on the cathode, eliminating intermittent steps and reducing production time
5Manufacturing precision
If multiple processing steps including mixing, pressing, molding, and vacuum treatment are performed, then titanium metal can be produced, but processing complexity increases
Solution Approach 1:
The patent merges multiple processing steps into a single electrolysis process. The mixing of titanium-containing material with carbonaceous reducing agent, the thermal reduction, and the electrolysis are all conducted in the same molten salt electrolyte system, eliminating separate vacuum treatment and molding steps, thereby reducing processing complexity while maintaining titanium metal quality
Solution Approach 2:
The patent makes the molten salt electrolyte system multi-functional by using it for both thermal reduction and electrolysis. The same electrolyte serves as the reaction medium for carbon reduction of TiO2 and as the conductive medium for electrolytic titanium deposition, eliminating the need for separate equipment and simplifying the overall process
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 method achieves low energy consumption and production costs while minimizing titanium loss, resulting in high-purity titanium metal powder with reduced processing complexity.
Implementation Method 1
performing pre-electrolysis in inert atmosphere to obtain a residual anode; after the residual anode is washed, molded and dried, using the residual anode as a second anode, using a metal or an alloy as a second cathode, using an alkali metal chloride molten salt and/or an alkaline earth metal chloride molten salt as a second electrolyte to constitute a second electrolysis system, performing electrolysis in inert atmosphere to obtain titanium metal powder
Implementation Method 2
using an alkali metal chloride molten salt and/or an alkaline earth metal chloride molten salt as a first electrolyte to constitute a first electrolysis system
Data Source
AI summary
A method of producing titanium metal with titanium-containing material which includes mixing, pressing and drying the titanium-containing material with a carbonaceous reducing agent to obtain a resultant as a first anode. Using a metal or an alloy as a first cathode, and using an alkali metal chloride molten salt and/or an alkaline earth metal chloride molten salt as a first electrolyte to constitute a first electrolysis system, to perform pre-electrolysis in an inert atmosphere to obtain a residual anode. After the residual anode is washed, molded and dried, using the residual anode as a second anode, using a metal or an alloy as a second cathode, using an alkali metal chloride molten salt and/or an alkaline earth metal chloride molten salt as a second electrolyte to constitute a second electrolysis system, to perform electrolysis in an inert atmosphere to obtain titanium metal powder.