Vertical Froth Flotation Column with Fluidized Bed
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Solution Overview
Problem
Current froth flotation technologies face challenges in efficiently recovering coarse mineral ore particles, leading to high energy consumption and water usage, and are limited by the size of particles that can be processed, with existing systems struggling to effectively handle particles above the optimum range.
Innovation Solution
A froth flotation system that includes a froth flotation vessel with a fluidised bed and multiple outlets to separate and classify particles, allowing for the collection of bubble-particle aggregates that do not enter the froth layer, enabling the production of two flotation concentrates and a high-solids tailings stream, which can be directly discharged without additional dewatering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional froth flotation technologies are used to recover coarse mineral ore particles, then the recovery efficiency of coarse particles is poor, but energy consumption and water usage increase
Solution Approach 1:
The flotation cell is divided into distinct zones: a fluidized bed zone at the bottom for particle-bubble contact, a separation zone in the middle for bubble-particle aggregate formation, and a froth zone at the top for concentrate collection. This segmentation allows different functions to occur in optimized environments, improving coarse particle recovery while reducing energy requirements in each zone.
Solution Approach 2:
The invention transitions from traditional horizontal or inclined flotation cells to a vertical column configuration with upward gas flow. This dimensional change creates a fluidized bed environment that enhances particle-bubble contact efficiency for coarse particles while reducing the need for high-energy mechanical agitation.
2Adaptability or versatility
If conventional froth flotation systems process particles above the optimum size range, then the system struggles to effectively handle coarse particles, but additional processing equipment is required
Solution Approach 1:
The flotation column is designed to handle a wide range of particle sizes within a single device. The fluidized bed zone effectively processes coarse particles (up to several millimeters) while also handling finer particles, eliminating the need for separate processing lines for different size fractions and reducing overall plant complexity.
Solution Approach 2:
The system changes key operational parameters including upward gas velocity, liquid flow rate, and reagent dosing to optimize performance for coarse particles. By adjusting these parameters, the same equipment can adapt to different particle size distributions and mineral types, enhancing versatility without adding complexity.
3Manufacturing precision
If multiple outlets are used to collect bubble-particle aggregates and produce high-solids tailings stream, then the production of high-grade flotation products is enhanced, but the system complexity increases
Solution Approach 1:
The column incorporates multiple strategically positioned outlets: a froth product outlet at the top for high-grade concentrate collection, a middlings outlet in the separation zone for recovering partially floated particles, and a tailings outlet at the bottom for high-solids waste discharge. This segmentation of product streams allows optimized recovery at different stages while maintaining manageable system complexity through logical zonation.
4Productivity
If high-solids tailings stream is produced for direct discharge, then additional dewatering equipment is eliminated, but the separation and classification requirements become more challenging
Solution Approach 1:
The system performs preliminary separation and classification actions within the flotation column itself through the fluidized bed and separation zones. Particles are pre-classified by density and hydrophobicity before discharge, allowing the tailings stream to achieve high solids content while maintaining acceptable separation quality, eliminating the need for additional dewatering equipment.
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 the recovery of coarse particles, reduces energy and water consumption, and allows for the production of high-grade flotation products, thereby optimizing the froth flotation process and minimizing downstream processing costs.
Implementation Method 1
the mixture of particles and fluid are subjected to an upward flow of an introduced gas to form a froth layer which rises above an interface formed between the froth layer and the mixture of particles and fluid, such that a quantity of the selected particles is conveyed out of the vessel by the froth layer
Implementation Method 2
the mixture of particles and fluid are subjected to an upward flow of an introduced gas to form a froth layer which rises above an interface formed between the froth layer and the mixture of particles and fluid
Data Source
AI summary
A separation system is disclosed for separating selected particles from a mixture of particles in a fluid. The system includes a froth flotation vessel into which in use the mixture of particles and fluid are subjected to an upward flow of an introduced gas to form a froth layer which rises above an interface formed between the froth layer and the mixture of particles and fluid, such that a quantity of the selected particles is conveyed out of the vessel by the froth layer to become a first product of the system. The vessel also has a first outlet arranged in use for receiving a flow of some of the mixture of particles and fluid from the vessel, an entry to the first outlet being located in a region proximate to, but below, the interface. The vessel also has a second outlet arranged in use for receiving a flow of some of the mixture of particles and fluid from a region of the vessel which is located below the first outlet. In use the first outlet receives a quantity of the selected particles which were not conveyed out of the vessel by the froth layer, and the second outlet receives a quantity of the selected particles in a first by-product of the system. The first by-product comprises a relatively higher percentage of solids compared to the flow of particles and fluid in the first outlet. The flow of the mixture of particles and fluid from the vessel via the first outlet passes to a classification device, which separates the flow into two or more fractions on the basis of their size or density or a combination of the two.