Autogenous Precoat Filter Medium for Nanoparticle Separation
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Solution Overview
Problem
Polishing filters face rapid clogging due to nanosize particles, leading to reduced filtering efficiency and increased costs, as the solids content in process liquids is not effectively managed, causing a layer impermeable to liquid to form on the filter medium, which blocks the pores and reduces the filtration efficiency.
Innovation Solution
The use of an autogenous precoat formed from the underflow with a larger particle size than the overflow, which serves as a filter aid medium on the surface of the filter medium, preventing clogging and enhancing the separation of nanoparticle-size solids without blocking the filter medium, and can be reused in the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polishing filtration is used to separate nanosize particles, then filtering efficiency is improved, but the filter medium becomes blocked rapidly
Solution Approach 1:
The invention introduces an autogenous precoat layer as an intermediary between the nanosize particles and the filter medium. This precoat layer, formed from process underflow with larger particles, acts as a mediator that captures the nanosize particles before they can block the filter medium pores, thereby maintaining filtering efficiency while extending filter medium service life
Solution Approach 2:
The invention applies preliminary action by forming a precoat layer on the filter medium surface before the actual polishing filtration begins. This precoat is prepared in advance using process underflow, creating a protective barrier that prevents nanosize particles from directly blocking the filter medium during the filtration process
2Manufacturing precision
If the filter medium pores are blocked by nanosize particles, then particle separation is improved, but liquid flow is reduced
Solution Approach 1:
The autogenous precoat layer serves as an intermediary structure that provides the necessary pore size for capturing nanosize particles while maintaining adequate liquid flow. The precoat's porous structure allows liquid to pass through while trapping particles, resolving the contradiction between separation efficiency and flow rate
3Duration of action of stationary object
If filter aid medium is added to prevent clogging, then filter medium service life is improved, but process complexity and costs increase
Solution Approach 1:
The invention applies self-service by using process underflow (a byproduct already present in the system) to form the autogenous precoat layer. This eliminates the need to import external filter aid materials, reducing process complexity and costs while still preventing filter medium clogging and extending service life
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 improves filtering efficiency, reduces waste and byproduct volumes, and minimizes costs by using the autogenous precoat to filter and precipitate/adsorb/crystallize nanoparticle-size solids, maintaining the process's stability and efficiency.
Implementation Method 1
the precoat serves as a filter aid medium in polishing filtration of the overflow
Implementation Method 2
the solids fed at a low feed rate are filtered, possibly also precipitated, adsorbed or crystallized
Implementation Method 3
the solids fed at a low feed rate are filtered, possibly also precipitated, adsorbed or crystallized
Implementation Method 4
the solids fed at a low feed rate are filtered, possibly also precipitated, adsorbed or crystallized
Data Source
AI summary
Methods and equipment for preparing a precoat on the surface of a filter medium of a polishing filter. A feature in the invention is that in the polishing filter, the precoat is formed either exclusively or jointly from the underflow created in the separation process.