Bitumen Extraction Process Agent for Oil Sands Recovery
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Solution Overview
Problem
Current bitumen extraction methods from oil sands face inefficiencies due to emulsification issues and prolonged tailings settling times, leading to reduced recovery efficiency and environmental concerns.
Innovation Solution
A method involving a process agent comprising sodium silicate, aluminate, or dodecyl sulfate, or their combinations, is used to enhance bitumen recovery by forming a bitumen-containing slurry, improving froth quality and reducing tailings pH, thereby increasing bitumen extraction efficiency and facilitating better water recirculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional additives such as caustic soda and/or soda ash are added to increase pH and water-soluble fraction of bitumen, then bitumen recovery is enhanced, but emulsification occurs during froth treatment and tailings settling time increases
Solution Approach 1:
The patent changes the chemical parameters by using sodium silicate with specific SiO2 to Na2O ratios (2:1 to 3:1) instead of traditional caustic soda or soda ash. This parameter change achieves the desired pH increase (to between 9 and 11) and bitumen recovery enhancement without causing emulsification or prolonged settling times, as the silicate chemistry differs fundamentally from hydroxide or carbonate additives.
Solution Approach 2:
The invention uses composite chemical formulations combining sodium silicate with specific ratios of SiO2 to Na2O, along with optional additives like dodecyl sulfate and aluminate. This composite approach creates a process agent that simultaneously achieves multiple functions: increasing pH, enhancing bitumen solubility, preventing emulsification, and maintaining rapid settling, which cannot be achieved by single-component traditional additives.
2Productivity
If pH is increased to enhance bitumen recovery, then water-solubility of bitumen increases, but natural surfactants are extracted and metal carbonates are formed causing emulsification
Solution Approach 1:
The patent changes the chemical approach by using sodium silicate instead of strong bases like caustic soda. The silicate system achieves pH elevation through a different chemical mechanism that does not aggressively strip natural surfactants or form emulsifying metal carbonates, thereby maintaining froth stability while still enhancing bitumen recovery.
Solution Approach 2:
Sodium silicate acts as an intermediary chemical agent that mediates between the need for pH increase and the need to avoid emulsification. It provides a buffering effect and creates a chemical environment that enhances bitumen solubility without the harmful side effects of traditional pH increasers, effectively decoupling these two conflicting requirements.
3Productivity
If emulsification occurs during froth treatment, then bitumen extraction efficiency is reduced, but water clarity and settling time are affected
Solution Approach 1:
The patent applies preliminary anti-action by using sodium silicate to prevent emulsification from occurring in the first place. The silicate chemistry creates conditions that inhibit the formation of stable emulsions during froth treatment, thereby maintaining high bitumen extraction efficiency and clear water without requiring subsequent demulsification steps.
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 method increases bitumen recovery, improves froth quality, and maintains a short settling time for tailings, resulting in higher processing capacities and reduced environmental impact.
Implementation Method 1
increase the pH of the slurry to increase the water-solubility of the bitumen
Implementation Method 2
an aluminate, a dodecyl sulfate, or a combination thereof
Implementation Method 3
The surfactant formation can cause emulsification during froth treatment
Implementation Method 4
an increased tailings settling time can lead to a reduction in land reclamation and water recirculation
Data Source
AI summary
The present invention generally relates to methods and process agents for bitumen extraction from ore. More specifically, the method comprises contacting a process agent to the ore and adding water to form a bitumen-containing slurry. The process agent comprises sodium silicate, an aluminate, a dodecyl sulfate, or a combination thereof.