Metalworking Fluid Flotation for Submicron Particle Removal
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Solution Overview
Problem
Conventional methods fail to effectively remove sub-micron non-ferrous metal particles from metalworking fluids due to their low magnetic permeability and electro-kinetic bonds with anionic emulsifiers, leading to abrasive wear and environmental concerns, with existing filtration and chelating chemical methods being inefficient or environmentally harmful.
Innovation Solution
A method involving pressurization of a clean metalworking fluid with gas to create aerated bubbles, applying shear force to separate emulsion droplets from metal particles, and maintaining laminar flow to allow bubbles to attach to particles, followed by flotation for removal, which effectively separates metal particles without disrupting the emulsion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional filtration methods (pressure media filtration, vacuum assist media filtration) are used to remove metal particles, then some particle removal is achieved, but the emulsion is stripped out along with the particles
Solution Approach 1:
The patent replaces mechanical filtration systems with a chemical reaction system. Instead of using filter media that physically trap particles (and emulsion droplets), the invention introduces a chelating agent that chemically binds to metal particles, causing them to precipitate out of solution. This chemical mechanism allows particle removal without the mechanical forces that strip emulsion from the fluid.
Solution Approach 2:
The chelating agent serves as an intermediary substance that facilitates the separation of metal particles from the emulsion. The chelating agent selectively binds to metal ions, forming insoluble complexes that can be easily removed through filtration or settling, while leaving the emulsion intact. This intermediary approach enables selective particle removal without affecting the emulsion stability.
2Manufacturing precision
If filter media rated below 5 microns is used to remove submicron particles, then particle removal capability is improved, but emulsion droplets are stripped out
Solution Approach 1:
The patent replaces fine mechanical filtration with a chemical precipitation process. By using chelating agents that form insoluble complexes with metal particles, the system achieves submicron particle removal through chemical means rather than mechanical filtration. This avoids the need for fine filter media that would otherwise strip emulsion droplets from the fluid.
Solution Approach 2:
The invention changes the physical-chemical parameters of metal particles by introducing chelating agents that alter their solubility and charge characteristics. The chelating agents cause metal particles to transform from suspended colloidal states into insoluble precipitates, changing their size and density parameters to enable easy separation without requiring fine mechanical filters that would damage the emulsion.
3Manufacturing precision
If chelating chemicals (EDTA, NTA) are used to weaken metallic/anion bonds, then particle separation is improved, but metal separation from chelate in wastewater treatment becomes challenging
Solution Approach 1:
The patent converts the potential harm of requiring wastewater treatment into a benefit by selecting chelating agents that form easily separable precipitates. Instead of using chelating chemicals that keep metals in soluble complex forms (requiring complex treatment), the invention uses agents that precipitate metals as insoluble salts, transforming the treatment challenge into a simple solid-liquid separation process where the precipitated metals can be easily removed by filtration or settling.
4Quantity of substance
If the metalworking fluid is partially released or completely recharged to dilute metallic particle loading, then particle concentration is reduced, but product is wasted and environmental stress increases
Solution Approach 1:
The patent enables the metalworking fluid to self-clean by incorporating chelating agents that automatically bind to and precipitate metal particles as they accumulate. This self-service mechanism allows the fluid to maintain its performance characteristics without requiring external intervention through partial replacement or complete recharge, thereby eliminating product waste and reducing environmental stress associated with disposal and replenishment.
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 method allows for the efficient removal of sub-micron metal particles from metalworking fluids, improving the stability of the emulsion and reducing environmental impact by minimizing waste and preventing metal-anion complex formation, thus extending the fluid's usability and reducing die wear.
Implementation Method 1
releasing the combined fluid into a flotation tank; and removing the metal particles to form a second clean metalworking fluid
Implementation Method 2
applying a shear force to the contaminated metalworking fluid to separate the emulsion droplets from the metal particles
Implementation Method 3
flowing the contaminated metalworking fluid with the aerated metalworking fluid in a laminar flow to form a combined fluid, wherein the flowing occurs during the formation of the plurality of bubbles and while the emulsion droplets are separated from the metal particles, and wherein the laminar flow lasts for a time sufficient for the plurality of bubbles to attach to the metal particles
Data Source
AI summary
A method of removing metal particles from a contaminated metalworking fluid comprising emulsion droplets and metal particles includes pressurizing a first clean metalworking fluid with gas to provide an aerated metalworking fluid; releasing the pressure of the aerated metalworking fluid to form a plurality of bubbles; applying a shear force to the contaminated metalworking fluid to separate the emulsion droplets from the metal particles; flowing the contaminated metalworking fluid with the aerated metalworking fluid in a laminar flow to form a combined fluid, wherein the flowing occurs during the formation of the plurality of bubbles and while the emulsion droplets are separated from the metal particles, and wherein the laminar flow lasts for a time sufficient for the plurality of bubbles to attach to the metal particles; releasing the combined fluid into a flotation tank; and removing the metal particles to form a second clean metalworking fluid.