Metallurgical Slag Treatment Vessel Segmentation
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Solution Overview
Problem
Existing methods for treating metallurgical slags, particularly LD slags from steel production, require high capital and operating costs due to the need for alternating reducing and oxidizing atmospheres, leading to inefficient processes and increased logistics efforts.
Innovation Solution
A method utilizing a divided vessel with separate neutral forehearth, reducing, and oxidizing chambers, allowing independent material transfer and energy management, where high-calorific waste gases from the reduction stage are used for heating in the oxidation phase, and solid LD slag and oxidizers are added for dephosphorization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If alternating reducing and oxidizing treatments are carried out in one and the same vessel, then iron oxide recovery is achieved, but the process complexity and operating costs increase due to constant atmosphere changes
Solution Approach 1:
The treatment vessel is divided into two separate chambers: a reducing chamber for iron oxide reduction and an oxidizing chamber for dephosphorization. This segmentation allows each chamber to maintain a stable, dedicated atmosphere (reducing or oxidizing) without requiring constant switching, thereby reducing process complexity while achieving the same iron oxide recovery goal.
Solution Approach 2:
The oxidizing treatment step is extracted from the reducing chamber and performed separately in a dedicated oxidizing chamber. This separation eliminates the need for atmosphere switching in the reducing chamber, simplifying the overall process control while maintaining iron oxide recovery efficiency.
2Loss of substance
If the metal bath is transported from reducing treatment to oxidizing treatment in a separate ladle, then dephosphorization is achieved, but logistics efforts and operating costs increase
Solution Approach 1:
The reducing chamber and oxidizing chamber are merged into a single integrated vessel structure with shared heating and control systems. The metal bath remains in the same vessel throughout both treatment steps, eliminating the need for ladle transportation and associated logistics while achieving dephosphorization.
Solution Approach 2:
The treatment process continues without interruption as the metal bath transitions directly from reducing to oxidizing atmosphere within the same vessel. This continuous action eliminates downtime associated with ladle transport and repositioning, reducing logistics effort and operating costs.
3Reliability
If separate treatment plants are used for reducing and oxidizing treatments, then specialized processing is achieved, but investment costs and logistics increase
Solution Approach 1:
A single treatment vessel is designed to perform both reducing and oxidizing functions through controlled atmosphere changes. The vessel serves multiple purposes (reduction and dephosphorization) without requiring separate specialized plants, reducing investment costs while maintaining reliable specialized processing in each chamber.
4Ease of manufacture
If high-calorific waste gases from reduction stage are not utilized, then process simplicity is maintained, but energy efficiency and operating costs worsen
Solution Approach 1:
The high-calorific waste gases produced during the reducing treatment are captured and redirected to fuel the oxidizing chamber. This converts what would be harmful waste emissions into a useful energy source, improving energy efficiency and reducing operating costs while maintaining process simplicity through integrated gas routing.
Solution Approach 2:
Instead of discarding the waste gases from the reduction stage, they are recovered and utilized as fuel for the oxidizing chamber. This recovery process improves energy efficiency by eliminating the need for external fuel sources in the oxidizing stage while maintaining operational simplicity.
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 minimizes investment and operating costs while maintaining high output efficiency, enabling continuous operation and efficient use of waste gases, reducing the need for separate treatment plants and logistics.
Implementation Method 1
high-calorific waste gases from the reduction stage are used for heating in the oxidation phase
Implementation Method 2
efficient use of waste gases, reducing the need for separate treatment plants and logistics
Implementation Method 3
the iron oxide contained in the LD slag is reduced to a metal bath
Implementation Method 4
a carbon-containing reducing agent is blown in over a longer period of time
Implementation Method 5
this metal bath is then oxidized Treatment dephosphorized
Implementation Method 6
a device for the reducing treatment of metallurgical slag is shown, in which the slag is fed from a tiltable feed vessel into a reduction vessel heated by an electric arc
Implementation Method 7
the mixture being electrically heated
Data Source
Figure 1
AI summary
The invention relates to a method for treating metallurgical slags, and in particular slags from steel production, wherein a device (1) is used which is divided into a forehearth (2), a reduction chamber (3), and an oxidation chamber (4), wherein liquid slag, as well as possibly solid agglomerates and residual metal, are filled into the forehearth (2) and kept there at a predetermined temperature, or brought to and kept at this temperature, and the slag and residual steel are left in the forehearth (2) until the reduction chamber (3) is ready to receive material, and subsequently slag and possiblyResidual steel is transferred to the reduction chamber (3) and a reduction is carried out in the reduction chamber (3), whereby the slag is treated with a reducing agent so that metal oxides are reduced and collect at the bottom of a melting plate (9) as molten metal, and the reduced slag is tapped off after reduction and fed to further processing as a hydraulic binder, and the resulting molten metal is fed to the oxidation chamber (4) and is mixed with oxidizing agents and oxidized in the oxidation chamber (4) in order to remove accompanying metals from the molten metal and bind them in a slag present in the oxidation chamber (4), as well as a device for this purpose.