Three-Stage Cyclone Separation for Anthracite Recovery
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Solution Overview
Problem
Existing coal separation processes, such as magnetite-enriched heavy medium cyclonic separation, are economically inefficient and environmentally costly due to significant magnetite losses and high water consumption, failing to effectively separate high-quality Anthracite from mine tailings.
Innovation Solution
A three-stage cyclone separation process that uses recycled water to differentiate between low and high-quality carbon, minimizing equipment and energy requirements, and eliminating the need for additives, by employing cyclone separators to separate inert rock, low-quality carbon, and high-quality Anthracite, with specific gravity control maintaining efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If magnetite-enriched heavy medium cyclonic separation is used to separate coal from refuse, then separation efficiency is improved, but operational cost increases due to substantial magnetite losses and high water consumption
Solution Approach 1:
The patent extracts and removes magnetite from the system by using magnetic separators to recover magnetite from the slurry before it enters the cyclone separators. This eliminates the need for continuous magnetite replenishment and reduces operational costs associated with magnetite losses.
Solution Approach 2:
The patent implements a water recycling system where process water is collected, treated, and reused in the slurry preparation. This recovery approach significantly reduces fresh water consumption and operational costs while maintaining separation efficiency.
2Manufacturing precision
If magnetite-enriched heavy medium cyclonic separation is used to separate coal from refuse, then separation efficiency is improved, but water consumption increases substantially
Solution Approach 1:
The patent implements a water recycling system where process water is collected from various stages, treated to remove solids and contaminants, and reused in the slurry preparation process. This closed-loop approach significantly reduces fresh water consumption while maintaining the required slurry properties for effective separation.
Solution Approach 2:
The system uses its own process water for making up slurry density adjustments rather than relying entirely on fresh water inputs. The recycled water serves the system's own needs, reducing external resource requirements.
3Loss of substance
If magnetic separators are added to recover magnetite from underflow slurry, then magnetite loss is reduced, but capital investment and device complexity increase significantly
Solution Approach 1:
The patent introduces magnetic separators at strategic points in the process to extract and remove magnetite from the slurry stream before it enters the cyclone separators. This extraction approach prevents magnetite loss while using relatively simple equipment that can be integrated into existing systems.
Solution Approach 2:
The patent uses magnetic fields as an intermediary mechanism to separate magnetite particles from the slurry without requiring complex mechanical separation equipment. This approach provides an efficient and cost-effective method for magnetite recovery.
4Manufacturing precision
If heavy medium cyclonic separation is used to separate coal from refuse, then separation capability is improved, but the process cannot effectively differentiate between low and high quality Anthracite
Solution Approach 1:
The patent divides the separation process into multiple stages using multiple cyclone separators with different operating parameters. The first cyclone performs initial separation, while subsequent cyclones further differentiate between low quality carbon and high quality Anthracite based on density and size variations, enabling effective quality differentiation.
Solution Approach 2:
The patent employs variable vane cyclone separators that allow dynamic adjustment of separation parameters during operation. This enables the system to adapt to different feed conditions and optimize separation for different quality levels of Anthracite, enhancing versatility and adaptability.
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 process recovers high-quality Anthracite efficiently, reduces operational costs, minimizes environmental impact, and conserves resources by using recycled water, while reducing the need for ancillary equipment and manpower, achieving economical and environmentally friendly coal separation.
Implementation Method 1
a first cyclone separator to divide the feedstock slurry into a refuse rich underflow stream and a carbonaceous rich overflow stream
Implementation Method 2
The separator produces an overflow which is carbon-rich and an underflow which is rich in refuse
Implementation Method 3
The underflow stream is dewatered through a vibrating screen
Data Source
AI summary
A process for separating Anthracite and low quality carbon from refuse. Crushed refuse is admixed with water from a water storage source. The admixture is transferred to a first cyclone separator to divide the admixture into a refuse rich slurry stream and a carbonaceous rich slurry stream. The refuse rich slurry stream is dewatered through a vibrating screen and the water collected sent to the raw feed sump source. The carbonaceous rich slurry is directed to a second cyclone separator to separate low quality carbon from high quality carbon, the high quality carbon is transferred to a third cyclone separator used to separate the media water therefrom. The separated media water is returned via a siphon leg to the raw feed sump, and the dewatered high quality Anthracite is available for markets requiring higher quality carbon.