Bitumen Recovery via Column Flotation Cell

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Solution Overview

Problem

Conventional bitumen recovery processes from oil sand are energy inefficient and require mechanical agitation, which increases maintenance costs and reduces the efficiency of the separation process.

Innovation Solution

A bitumen recovery process that involves subjecting bitumen froth produced in a primary separation process to froth flotation in a column flotation cell, which aerates the feed material without mechanical agitation, allowing for the separation of bitumen from fine mineral matter.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional hot water process with mechanical agitation is used, then bitumen can be liberated from oil sand, but energy consumption increases and maintenance costs increase

Engineering Contradiction:

Improvebitumen recovery efficiencyVSAvoidenergy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The patent replaces mechanical agitation systems with a flotation-based separation process. Instead of using mechanical means to liberate and separate bitumen, the invention uses air bubbles to float bitumen droplets to the surface, eliminating the need for high-energy mechanical mixing while achieving effective bitumen recovery from oil sand

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If mechanical agitation is used in separation process, then bitumen separation can be achieved, but maintenance costs increase

Engineering Contradiction:

Improveseparation efficiencyVSAvoidmaintenance costs

Core Design Contradiction:

ProductivityVSEase of repair

Solution Approach 1:

The invention eliminates mechanical agitation equipment by using a flotation cell where air bubbles naturally rise through the slurry, carrying bitumen droplets to the surface. This non-mechanical approach removes moving parts that require maintenance, reducing operational costs while maintaining effective separation

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If conventional froth flotation with mechanical agitation is used, then bitumen can be separated from fine mineral matter, but energy efficiency decreases

Engineering Contradiction:

Improveseparation selectivityVSAvoidenergy efficiency

Core Design Contradiction:

Manufacturing precisionVSLoss of energy

Solution Approach 1:

The patent replaces energy-intensive mechanical agitation in flotation cells with a passive flotation mechanism where air bubbles rise through gravity and buoyancy forces, naturally separating bitumen from fine mineral matter based on density differences without requiring continuous mechanical input

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Productivity

If aggressive thermal action is used to liberate bitumen, then bitumen recovery can be improved, but energy consumption increases

Engineering Contradiction:

Improvebitumen liberation efficiencyVSAvoidthermal energy input

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The invention replaces aggressive thermal processing with a mechanical-flotation hybrid approach where mild heating (if any) is combined with air bubble flotation. The separation relies on the physical property differences between bitumen and mineral matter rather than high thermal energy input, significantly reducing energy consumption

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 process enhances the selectivity and energy efficiency of bitumen recovery, reducing maintenance costs and improving the quality of the bitumen product by concentrating bitumen to between 10% and 65% weight, while minimizing the presence of fine mineral matter.

Implementation Method 1

subjecting the feed material to froth flotation in a column flotation cell

Methodology Applied

Scientific EffectFroth flotation: Froth Floatation

Implementation Method 2

aerates the feed material without mechanical agitation

Methodology Applied

Scientific EffectAeration: Aeration

Data Source

PatentUS7727384B2Bitumen recovery process for oil sand

Publication Date: 2010.06.01 BITMIN RESOURCES

AI summary

A bitumen recovery process is provided which includes the step of providing a bitumen froth or a component derived from the bitumen froth as a feed material, wherein the bitumen froth is produced in a primary separation process from a slurry comprising oil sand and water. Further, the process includes the step of subjecting the feed material to froth flotation in a column flotation cell in order to recover a bitumen product from the feed material. Preferably, the froth flotation cell includes an underwash zone, wherein a bitumen-rich fraction of the feed material is passed through the underwash zone as the bitumen-rich fraction rises within the column flotation cell.