Low-Temperature Carbothermal Reduction of TiO2-Slag
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Solution Overview
Problem
Conventional methods for producing titanium are costly and energy-intensive due to their indirect nature and reliance on high-temperature chlorination processes, making titanium production economically unviable for many industries.
Innovation Solution
A method involving alkaline roasting of TiO2-slag to remove impurities, followed by reduction with a metallic reducing agent in a hydrogen atmosphere to produce titanium hydride or elemental titanium, and subsequent deep-deoxidation to purify the product, eliminating the need for high-temperature chlorination and reducing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional high-temperature chlorination processes (Kroll/Hunter methods) are used to produce titanium, then high purity titanium metal can be obtained, but production costs increase twenty times compared to steel and energy consumption becomes excessively high
Solution Approach 1:
The patent fundamentally changes the temperature parameter from conventional high-temperature (800-1000°C) chlorination processes to low-temperature (25-100°C) carbothermal reduction. This parameter change enables direct conversion of TiO2 to Ti metal without requiring energy-intensive heating, thereby reducing energy consumption while maintaining titanium purity through controlled reaction conditions and selective impurity removal
Solution Approach 2:
The patent extracts and removes impurities (Fe, Al, Si, Ca, Mg, Mn, P, S) from the TiO2 feedstock before the reduction process. By pre-concentrating and removing these impurities through chemical treatment and classification, the subsequent low-temperature reduction produces high-purity titanium metal without requiring the high temperatures and complex purification steps of conventional methods
2Quantity of substance
If conventional high-temperature chlorination processes are used, then titanium metal can be produced, but production time becomes excessively long and process complexity increases
Solution Approach 1:
The patent segments the titanium production process into distinct operational stages: (1) impurity removal and concentration, (2) low-temperature carbothermal reduction, and (3) product classification. This segmentation allows each stage to be optimized independently and performed under mild conditions, dramatically reducing total production time compared to the continuous high-temperature processing required by conventional methods
Solution Approach 2:
The patent introduces carbon (coke or charcoal) as an intermediary reducing agent that enables titanium extraction at low temperatures. Instead of using high-temperature chlorination, the carbon mediator facilitates direct reduction of TiO2 to Ti metal through carbothermal reactions, allowing the process to proceed at 25-100°C and significantly reducing production time
3Quantity of substance
If indirect production methods with multiple processing stages are used, then titanium can be manufactured, but device complexity and process steps increase significantly
Solution Approach 1:
The patent merges multiple conventional process stages into a unified low-temperature carbothermal reduction process. By combining impurity removal, titanium extraction, and metal formation into a single integrated reaction system operating at 25-100°C, the patent eliminates the need for separate high-temperature chlorination, reduction, and purification equipment, thereby reducing device complexity while maintaining titanium production efficiency
Solution Approach 2:
The low-temperature carbothermal reduction process serves multiple functions simultaneously: it removes impurities, reduces TiO2 to Ti metal, and produces a separable product mixture. This multi-functional approach eliminates the need for specialized equipment for each process stage, simplifying the overall device complexity while achieving high-purity titanium production
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 significantly reduces production costs and energy consumption by directly producing titanium from TiO2-slag, improving the economic viability of titanium metal production while maintaining high purity and mechanical properties.
Implementation Method 1
reducing the intermediate products using a metallic reducing agent at a temperature and a pressure under a hydrogen atmosphere to produce a reaction product comprising a physical mixture of TiH2 or Ti metal and various impurities
Implementation Method 2
reducing the intermediate products using a metallic reducing agent at a temperature and a pressure under a hydrogen atmosphere to produce a reaction product comprising a physical mixture of TiH2 or Ti metal
Data Source
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AI summary
A method (400) for producing a titanium product is disclosed. The method (400) can include obtaining TiO2-slag (401), and producing a titanium product from the TiO2-slag using a metallic reducing agent (402) at a moderate temperature and a pressure to directly produce a titanium product chemically separated from metal impurities in the TiO2slag (403). The titanium product can comprise TiH2 and optionally elemental titanium. Impurities in the titanium product can then removed (404) by leaching, purifying and separation to form a purified titanium product.