Cyclonic Flotation Column Segmentation for Fine and Coarse Particle Recovery
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Solution Overview
Problem
The copper mining industry faces challenges in efficiently recovering copper from low-grade ores due to declining ore grades, leading to increased energy consumption and costs, as conventional flotation methods are inefficient for fine and coarse particles, resulting in low separation efficiencies and significant energy expenditure.
Innovation Solution
The implementation of a method that involves rendering fine and coarse particulate materials hydrophobic using surface treatments and separating them using small air bubbles or recyclable hydrophobic liquids in cyclonic flotation systems, combined with a first-principle mathematical model to optimize flotation plant performance and extend the effective particle size range for recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional flotation methods are used for fine and coarse particles, then the separation process can be performed, but the separation efficiency is low and energy consumption is high
Solution Approach 1:
The patent segments the flotation process into distinct zones: a first flotation zone for fine particles using small bubbles, and a second flotation zone for coarse particles using larger bubbles. This segmentation allows each zone to be optimized for its specific particle size range, improving overall separation efficiency while reducing energy consumption by avoiding the need to use a single high-energy system for all particle sizes.
Solution Approach 2:
The patent applies local quality by providing different flotation conditions in different zones of the flotation column. The first zone has conditions optimized for fine particles (small bubbles, specific upward velocity), while the second zone has conditions optimized for coarse particles (larger bubbles, different velocity profile). This localized optimization resolves the contradiction by allowing efficient separation of both fine and coarse particles without compromising overall energy efficiency.
2Reliability
If ore grinding is made finer to improve liberation, then mineral liberation characteristics improve, but energy consumption increases
Solution Approach 1:
The patent changes the parameter of bubble size distribution in the flotation column to match different particle size ranges. By using small bubbles in the first zone for fine particles and larger bubbles in the second zone for coarse particles, the system achieves effective liberation and separation without requiring excessive fine grinding, thus reducing the energy consumption associated with ore preparation while maintaining mineral liberation quality.
3Adaptability or versatility
If a single flotation system is used for all particle sizes, then the device complexity is low, but the effective particle size range for recovery is limited
Solution Approach 1:
The patent divides the flotation column into multiple zones with different bubble size characteristics, allowing the system to handle a wide particle size range from fine to coarse particles. This segmentation increases adaptability while keeping the overall device structure relatively simple by using a single column rather than multiple separate flotation units.
Solution Approach 2:
The flotation column is designed to perform multiple functions within a single device: it can simultaneously or sequentially process fine particles in the first zone and coarse particles in the second zone. This multi-functionality expands the effective particle size range without requiring separate specialized equipment for each particle size category, thus balancing versatility with device complexity.
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 enhances copper recovery and throughput while minimizing energy consumption, allowing for the production of high-grade concentrates with reduced capital expenditure and operational costs, effectively addressing the limitations of conventional flotation methods.
Implementation Method 1
the one type of fine particulate material is hydrophobized and the one type of fine particulate material is selectively collected by the air bubbles
Implementation Method 2
allowing the air bubbles loaded with the one type of fine particulate material to rise in the aqueous phase
Implementation Method 3
separating them using small air bubbles or recyclable hydrophobic liquids in cyclonic flotation systems
Data Source
AI summary
Various examples are provided in relation to improved recovery and throughput of both fine and coarse particulate materials. In one example, a method includes injecting an aqueous suspension of a cloud of small air bubbles into an aqueous phase including fine particulate materials, wherein the fine particulate material is selectively hydrophobized and collected by small air bubbles; allowing the bubbles to rise in the aqueous phase; and collecting the air bubbles to obtain a concentrate of the fine particulate materials. In another example, a method includes adding a hydrophobizing agent to an aqueous phase to render coarse particulate material selectively hydrophobic; allowing air bubbles to attach to the coarse particulate material and changing the apparent specific gravity of the coarse particulate materials so a layer of one type of coarse particle is formed on top; allowing the one type of coarse particles to float and enter the forth phase.