Reflux Classifier Segmentation for Low-Grade Mineral Separation
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Solution Overview
Problem
Reflux classifiers face difficulties in forming an effective fluidised bed for low-grade minerals, leading to prolonged processing times and increased costs due to low mineral concentrations, which complicates separation and reduces efficiency.
Innovation Solution
A classifier design featuring a mixing chamber with a conical mixing fluidisation floor and a smaller, centrally located concentration chamber with a conical concentration fluidisation floor, where the concentration chamber is fluidically connected to the mixing chamber, allowing for the formation of a concentrating fluidised bed and efficient separation of materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Reflux classifier is used for low-grade minerals, then gravity separation can be achieved, but the classifier cannot form an effective fluidised bed due to low mineral concentrations
Solution Approach 1:
The classifier is divided into two distinct chambers: a mixing chamber for receiving and initial fluidising the slurry, and a concentration chamber for forming the effective fluidised bed. This segmentation allows each chamber to perform its specific function optimally, with the concentration chamber being smaller and better suited for bed formation even with low mineral concentrations.
Solution Approach 2:
The concentration chamber is positioned below the mixing chamber, creating a vertical arrangement where slurry flows downward from the mixing chamber to the concentration chamber. This spatial dimensionality change allows the system to maintain continuous flow while creating distinct functional zones for mixing and concentration.
2Reliability
If many hours are spent forming a fluidised bed, then separation can occur, but productivity is reduced due to lost time
Solution Approach 1:
The mixing chamber performs preliminary fluidisation and mixing of the slurry before it enters the concentration chamber. This preliminary action prepares the slurry in advance, allowing the concentration chamber to form an effective fluidised bed much more quickly than if starting from scratch, thereby reducing overall processing time and increasing productivity.
Solution Approach 2:
The system maintains continuous slurry flow from the mixing chamber to the concentration chamber, ensuring that the fluidisation process is ongoing without interruption. The classifier can continuously receive feed material and produce separated products, eliminating idle time and maintaining constant productivity.
3Manufacturing precision
If multiple processing passes are used for low mineral concentrations, then desired output can be achieved, but capital and running costs increase
Solution Approach 1:
The concentration chamber is designed with specific local characteristics - smaller volume and positioned below the mixing chamber - to create optimal conditions for concentration. This localized design enhancement allows a single pass to achieve high-grade separation that would otherwise require multiple passes through larger, more complex processing systems.
4Quantity of substance
If a larger chamber is used for concentration, then more material can be processed, but bed formation becomes slower and less efficient
Solution Approach 1:
By separating the mixing function from the concentration function into two distinct chambers, the system allows the concentration chamber to be optimally sized for rapid bed formation. The mixing chamber handles the bulk material preparation, while the smaller concentration chamber focuses on efficient separation, achieving both capacity and speed.
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 design enables quick formation of a concentrating fluidised bed, reducing processing time and increasing productivity while achieving high-grade output with minimal further processing, thereby lowering operational and capital costs.
Implementation Method 1
a mixing chamber having a mixing fluidisation floor; and a concentration chamber having a concentration fluidisation floor
Implementation Method 2
which use gravity to separate solid particles from the liquid
Data Source
AI summary
A classifier and a method of separating material using such a classifier are disclosed. The classifier comprises a mixing chamber having a mixing fluidization floor and a concentration chamber having a concentration fluidization floor. The concentration fluidization floor and at least a portion of the concentration chamber is located below the mixing fluidization floor. The method of separating material using such a classifier comprises delivering material to be separated into a mixing chamber of the classifier, fluidizing the material in the mixing chamber; transferring some of the material to a concentration chamber of the classifier in fluid communication with the mixing chamber, fluidizing the material in the concentration chamber, forming a concentrating fluidized bed in the concentration chamber, separating the material with at least the concentrating fluidized bed and drawing heavier portions of the separated material from the concentration chamber.