Flotation Sparger Shear Mechanism for Low Energy Gas Dispersion
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Solution Overview
Problem
Conventional flotation separation systems in the minerals industry require significant energy to maintain slurry in suspension and create gas dispersion, leading to high operational costs and energy consumption.
Innovation Solution
The proposed flotation separation system incorporates a sparger unit with a sparging mechanism that shears gas into a bubble dispersion within the slurry, allowing hydrophobic species to adhere to bubbles, reducing the need for high energy input by maintaining a low pressure drop across the sparging mechanism and allowing slurry flow without restriction, thus minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flotation separation systems use high energy input to maintain slurry in suspension and create gas dispersion, then effective separation of hydrophobic species is achieved, but energy consumption increases significantly
Solution Approach 1:
The patent extracts the gas dispersion creation function from the main flotation cell and relocates it to a separate sparger unit. This sparger unit pre-mixes gas with slurry to form bubbles before the mixture enters the flotation cell, eliminating the need for high energy input devices (like impellers or compressors) within the main separation system while maintaining effective bubble-particle contact for hydrophobic species separation
Solution Approach 2:
The sparger unit performs preliminary gas dispersion and bubble formation before the slurry enters the flotation separation cell. By pre-creating the bubble dispersion in a low-pressure sparger, the system eliminates the need for high-energy gas injection and slurry suspension mechanisms in the main cell, significantly reducing overall energy consumption while ensuring effective separation
2Quantity of substance
If high pressure is applied to create gas dispersion in slurry, then bubble formation is enhanced, but pressure drop and energy loss increase
Solution Approach 1:
The sparger unit utilizes pneumatic principles by introducing gas through controlled pressure into the slurry flow. The gas pressure is sufficient to create fine bubble dispersion but is maintained at low levels (avoiding high pressure drops). The hydraulic design of the sparger allows efficient gas-liquid mixing without requiring excessive pressure, achieving high bubble concentration with minimal energy loss
3Reliability
If slurry flow is restricted to increase residence time for separation, then separation efficiency improves, but energy consumption for pumping increases
Solution Approach 1:
The system segments the flotation process into two distinct stages: (1) bubble formation and particle attachment in the low-pressure sparger unit, and (2) separation in the flotation cell. This segmentation allows the slurry to flow freely through the sparger without restriction (minimizing pumping energy) while still achieving effective separation in the second stage where residence time is naturally extended by the cell design
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 significantly reduces energy consumption by enabling efficient bubble-particle contact with a high air fraction and particle concentration, resulting in a smaller separation tank size and lower hydraulic pressure requirements, while maintaining effective recovery of hydrophobic species with reduced operational costs.
Implementation Method 1
A high shear element shears the gas into a bubble dispersion within the slurry for adhesion of the hydrophobic species to the bubble dispersion
Implementation Method 2
Gas bubbles introduced into the slurry attach, through a combination of physical and chemical means, to one or more of the hydrophobic species of the slurry
Implementation Method 3
The bubble-hydrophobic species agglomerates are sufficiently buoyant to lift away from the remaining constituents and are removed from the top of the separation system
Data Source
AI summary
A flotation separation system for partitioning a slurry comprises a flotation separation cell that comprises a sparger unit and a separation tank. The sparger unit comprises a slurry inlet for receiving a slurry and a gas inlet for introducing a gas into the slurry. The sparging mechanism disperses the gas bubbles within the slurry. A high shear element comprising a rotating shaft and a rotating high shear element mounted to it located within the sparging mechanism shears the gas into a bubble dispersion within the slurry. A slurry outlet discharges the slurry containing the bubble dispersion into the separation tank. An adjustable distributor plate at the slurry outlet restricts the flow of slurry through the slurry outlet. The distributor plate is mounted to the rotating shaft and rotates with the high shear element.