Spray Drying Tailings for Rapid Consolidation
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Solution Overview
Problem
Oil sands mining operations face challenges in consolidating tailings ponds due to low permeability and high water saturation, leading to slow natural consolidation, which hinders the reclamation of these areas back to their original state.
Innovation Solution
A spray process that emits tailings material as droplets into the air, which impact a solid substrate, separating water and forming thin, quickly drying pancakes, allowing for the buildup of consolidated layers with the aid of additives like gases, salts, and polymers to enhance water rejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tailings are deposited in ponds for natural consolidation, then the tailings material can settle and separate, but the process takes tens to thousands of years due to low permeability and high water saturation
Solution Approach 1:
The patent changes the physical parameters of tailings by spraying them as droplets to create thin layers (1-10 mm thickness) on landfills. This parameter change from bulk deposition to thin-layer spraying dramatically reduces consolidation time from thousands of years to months or years, while maintaining consolidation completeness through the thin layer configuration that enables faster water removal.
Solution Approach 2:
The patent segments the tailings material into fine droplets (1-10 mm diameter) that are sprayed onto the landfill surface. This segmentation creates numerous thin layers instead of one thick deposit, allowing each layer to consolidate independently and rapidly. The segmented approach transforms the consolidation process from a slow, bulk operation to a fast, distributed process.
2Loss of time
If tailings are sprayed as thin layers, then drying time is reduced to minutes or hours, but the spray system complexity increases
Solution Approach 1:
The patent employs self-service principles by utilizing natural environmental factors for drying—the thin sprayed layers (1-10 mm) dry passively through natural evaporation and airflow without requiring active heating or mechanical drying systems. This self-service approach reduces drying time to minutes or hours while avoiding the complexity of active drying equipment.
3Productivity
If additives like gases, salts, and polymers are used to enhance water rejection, then consolidation efficiency improves, but the process complexity and cost increase
Solution Approach 1:
The patent utilizes parameter changes in the physical state of water through phase transition during drying. The thin layers are sprayed and then allowed to dry naturally, transforming liquid water to vapor through evaporation. This parameter change (liquid to gas phase transition) enhances water rejection efficiency without requiring complex chemical additives or equipment.
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 method accelerates the consolidation and drying of tailings, reducing the time required to convert tailings ponds back to their original state from decades to a few years, enabling the support of soil and vegetation.
Implementation Method 1
the spray from the devices described herein emit micrometer to millimeter to centimeter scale droplets of tailings into the air which then fall and accelerate under gravity to a solid substrate
Implementation Method 2
The inertial impact of the spray droplet on the ground (or other solid substrate) separates the water and compresses the tailings droplet into a flat and thin pancake-like form
Implementation Method 3
the pancake dries relatively quickly within minutes to hours. In this manner, the pancakes form a layer of dried tailings on the ground
Data Source
AI summary
A process to treat fines tailings generated from mining operations, wherein tailings material is sprayed onto a solid substrate as a thin layer and allowed to dry. The spray may be re-applied on top of the dried tailings film leading to multiple layers of dried tailings solids. The method may yield a solid, dry, and consolidated tailings material.