Oblique Guiding Plates for Flotation Cell Slurry Flow

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Solution Overview

Problem

Current flotation cells face challenges in achieving high recovery of coarse particles greater than 150 μm, as they often fail to effectively guide slurry feed and break latent downward velocities, leading to reduced residence time and overall recovery.

Innovation Solution

A guiding arrangement comprising obliquely arranged guiding plates within the flotation tank, which directs slurry feed towards the overflow lip, breaking downward velocities and increasing residence time, thereby enhancing the upward flow of bubbles and overall recovery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If slurry feed is discharged directly into the flotation tank without guiding arrangement, then the feeding device structure is simple, but the residence time of particles is reduced and downward velocity is not broken

Engineering Contradiction:

Improveresidence time of particlesVSAvoidguiding arrangement structure

Core Design Contradiction:

Duration of action of moving objectVSDevice complexity

Solution Approach 1:

The guiding arrangement is segmented into multiple guiding plates arranged at different horizontal planes, with each plate performing the function of redirecting slurry flow. This segmentation allows the system to effectively break downward velocity and extend residence time while maintaining structural simplicity through modular plate components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The guiding plates are arranged obliquely in relation to the horizontal, introducing a dimensional angle component to the flow guidance. This oblique arrangement effectively converts vertical downward velocity into horizontal flow toward the overflow lip, extending particle residence time in the froth layer without requiring complex mechanical structures.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Force

If guiding plates are arranged horizontally, then the structure is simple, but the downward velocity of feed flow is not effectively broken

Engineering Contradiction:

Improvedownward velocity breakingVSAvoidguiding plates arrangement

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The guiding plates are arranged asymmetrically with respect to the horizontal plane, creating oblique surfaces that effectively intercept and redirect downward-moving slurry. This asymmetric oblique arrangement generates force components that counteract downward velocity while directing flow horizontally toward the overflow lip, achieving effective velocity breaking with simple plate structures.

Inventive Principle:

Principle #4Asymmetry

3Productivity

If guiding arrangement directs slurry toward overflow lip, then the recovery of coarse particles is improved, but the flow path becomes longer

Engineering Contradiction:

Improverecovery of coarse particlesVSAvoidflow path length

Core Design Contradiction:

ProductivityVSLength of moving object

Solution Approach 1:

The guiding plates are arranged to create a curved or sweeping flow path that gradually directs slurry toward the overflow lip, rather than a sharp angular redirection. This curved arrangement smooths the flow transition, reduces turbulence, and allows particles to follow the flow path more effectively, improving coarse particle recovery while managing the extended flow path length.

Inventive Principle:

Principle #14Spheroidality (Curvature)

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

The guiding arrangement significantly increases the recovery of coarse particles by ensuring effective guidance of slurry feed and extending residence time within the froth layer, resulting in improved flotation cell performance.

Implementation Method 1

the guiding arrangement comprises at least one guiding plate arranged obliquely in relation to the horizontal... moves the feed flow forward towards the overflow lip, breaks any latent downward velocity that the feed flow has after exiting the feeding device, and increases the residence time of the particles

Methodology Applied

Scientific EffectFluid flow guidance:

Implementation Method 2

helps direct upward flow of bubbles towards the overflow lip thereby increasing the overall recovery

Methodology Applied

Scientific EffectBubble rise: Archimedes' Principle (Buoyancy)

Data Source

PatentUS20250018405A1Guiding arrangement, flotation cell and flotation method

Publication Date: 2025.01.16 METSO OUTOTEC FINLAND OY

AI summary

A guiding arrangement configured to guide a slurry feed in a flotation tank of a flotation cell, a flotation cell and a flotation method. The guiding arrangement comprises at least one guiding plate arranged at the flotation cell. The at least one guiding plate is arranged obliquely in relation to the horizontal.