Polyurethane Screen Basket for CIL Slurry Separation
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Solution Overview
Problem
Conventional screen baskets used in metal recovery processes, such as CIP and CIL, suffer from low open screening area, leading to inefficient screening and clogging, which increases wear and reduces the lifespan of the screens due to the use of wedge wire screens.
Innovation Solution
A screen basket with a high open-area polyurethane screen sidewall, featuring a flexible molded polyurethane body with reinforcement members and a corrugated design, is affixed to a cylindrical frame, providing increased surface area and resistance to wear and clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If wedge wire screens are used in conventional screen baskets, then structural strength is maintained, but open screening area is reduced leading to clogging and inefficient screening
Solution Approach 1:
The patent replaces rigid wedge wire screens with flexible polyurethane screen elements that can be molded into corrugated configurations. These thin film structures provide high open area while maintaining sufficient flexibility to prevent clogging, directly resolving the contradiction between open screening area and screening efficiency
Solution Approach 2:
The patent introduces corrugations that add a third dimension to the screen surface, transforming flat screens into three-dimensional corrugated structures. This increases the effective screening surface area and improves flow dynamics, thereby enhancing screening efficiency while maintaining high open area
2Duration of action of stationary object
If wedge wire screens are used in conventional screen baskets, then initial durability is provided, but wear increases over time reducing lifespan
Solution Approach 1:
The patent uses polyurethane as a composite material that combines flexibility, wear resistance, and chemical inertness. This material property combination provides superior durability compared to traditional wedge wire screens while reducing wear and clogging, thereby extending screen lifespan
Solution Approach 2:
The flexible nature of the polyurethane screen elements allows them to resist clogging by flexing to prevent particle accumulation, while the material's inherent wear resistance properties extend the operational lifespan of the screens
3Device complexity
If conventional screen baskets are used, then simple structure is maintained, but screening performance is insufficient due to low open area
Solution Approach 1:
The patent incorporates corrugations that add dimensional complexity to the screen surface, transforming simple flat screens into three-dimensional corrugated structures. This increases the effective screening area and improves flow characteristics, thereby enhancing screening efficiency while adding controlled structural complexity
Data Source
AI summary
Embodiments of the present disclosure include a screen basket apparatus includes a substantially vertical cylindrical frame and a synthetic screening surface secured to the frame. The synthetic screening surface may be configured to separate carbon or resin from a slurry of a carbon-in-leach, carbon-in-pulp, resin-in-leach, or resin-in-pulp material as fluid flows from outside to inside the screen basket apparatus such that carbon or resin is retained on an external surface of the synthetic screening surface. The cylindrical frame may be a grid frame and the synthetic screening surface may include a plurality of replaceable screen assemblies attached to the grid frame. The grid frame may include a plurality of openings and each of the plurality of openings is configured to receive a respective one of the plurality of replaceable screen assemblies. The synthetic screening surface may include injected molded thermoplastics, thermoset polyurethanes, and/or other polymeric materials.