Mechanical Separation of Iron from Sludge Without Thermal Energy
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Solution Overview
Problem
Existing methods for separating secondary raw materials from iron-containing sludges are inefficient, often requiring harmful surfactants, high thermal energy, and prone to equipment damage, with a high water-to-solid ratio and complex post-treatment processes, while also not being able to handle non-pumpable materials effectively.
Innovation Solution
A mechanical process involving a feed hopper with a rake/grate, a mixing screw for conditioning, a drum sieve for classification, a separation container with air and water injection for clarification, and a chamber filter press for dewatering, which separates iron components from non-ferrous materials without using solvents or surfactants, allowing for direct reuse in iron smelting processes without further treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surfactants and dispersants are used for cleaning granular materials from fatty substances, then the cleaning effect is improved, but environmental harm increases and complex recovery/disposal processes are required
Solution Approach 1:
The patent replaces chemical cleaning methods (surfactants and dispersants) with a mechanical cleaning system consisting of a drum sieve with lifting elements that mechanically remove fatty substances from granular materials through lifting and dropping actions, eliminating environmental harm while maintaining cleaning effectiveness
Solution Approach 2:
The patent uses a water jet system to hydraulically remove fine adhering fatty substances from the cleaned granular material after mechanical cleaning, providing a environmentally friendly alternative to chemical cleaners while achieving thorough cleaning results
2Productivity
If thermal energy is used for treating mill scale and sludge, then separation efficiency is improved, but energy consumption increases
Solution Approach 1:
The patent replaces thermal energy-based separation methods with a mechanical separation system using a drum sieve with lifting elements that physically separate iron-containing granular material from fatty substances and water through mechanical lifting and dropping, achieving high separation efficiency without thermal energy consumption
Solution Approach 2:
The patent divides the separation process into distinct mechanical stages: initial mechanical cleaning in the drum sieve, followed by hydraulic rinsing with water jets, and final separation in a second drum sieve, achieving comprehensive separation efficiency without relying on thermal energy
3Productivity
If cyclones and magnetic separators are used for separation, then separation capability is improved, but device complexity and failure-prone components increase
Solution Approach 1:
The patent combines multiple separation functions into a single integrated drum sieve system that performs mechanical cleaning, size classification, and separation of fatty substances and water in one continuous process, eliminating the need for separate cyclones and magnetic separators while maintaining comprehensive separation capability
Solution Approach 2:
The drum sieve with lifting elements serves multiple functions simultaneously: it cleans granular material from fatty substances, separates materials by size, and removes water through its perforated structure, providing universal separation capability without requiring multiple specialized devices
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
The process achieves efficient separation of secondary raw materials with minimal environmental impact, high throughput, and reduced operational costs by using mechanical energy only, eliminating the need for thermal energy and surfactants, and enabling 100% of the separated materials to be fed directly into blast furnaces without further processing.
Implementation Method 1
transporting the mixture to a drum sieve (3) for the purpose of classifying and injecting water into the drum sieve (3), from where the iron components >3 mm are removed via a sieve overflow as secondary raw material (A)
Implementation Method 2
passing the remaining suspension into a separation container (4), into which air is injected in the bottom area via air nozzles (11) and water is also injected via nozzles (10) and which is provided with fins for clarification, non-ferrous components and fine iron sludge are guided via an overflow into a sedimentation basin
Implementation Method 3
fed to a chamber filter press (8), where dewatering and formation of a filter cake (C) takes place
Implementation Method 4
non-ferrous components and fine iron sludge are guided via an overflow into a sedimentation basin with a rotary valve (7)
Implementation Method 5
conditioning of the sludge in a mixing screw (2), in which the sludge is transferred into a flowable Consistency water is injected
Data Source
Figure 1
Figure 1A
Figure 2~3
AI summary
A process and apparatus for separating secondary raw materials from iron-containing sludges, such as mill scale sludge, are described, where the starting material may contain blocking agents and be non-pumpable. The process operates without the addition of detergents, solvents, or surfactants and requires no thermal energy input. It is environmentally friendly and self-sufficient; the required water can be recirculated. Iron-containing sludge is fed via a feed hopper with a screen (1). After conditioning in a mixing screw (2), the mixture is classified in a drum screen (3). Iron particles > 3 mm are recovered as secondary raw material (A), iron particles up to 3 mm as secondary raw material (B), and non-ferrous and fine iron particles as filter cake (C). The separated secondary raw materials are used directly for the coal injection of the coal mill (C) or...Used for direct feeding to iron smelting via a sintering plant.