Fibrillated Cellulose Consolidation for Ultrafine Particulates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for effective methods to stabilize unconsolidated particulate materials, particularly those containing mineralogically distinct components in various sizes, which often exhibit low shear strength and high water content, posing challenges in geotechnical engineering and construction.
Innovation Solution
The use of cellulose nanofibrils with high aspect ratios and water-holding capabilities is employed to entangle and stabilize particulates, achieving significant shear strength improvements by matching fibril dimensions with particle sizes, even in the presence of ultrafine-grained materials like clays and silica.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional stabilization methods are used on ultrafine-grained particulate materials, then some stabilization effect is achieved, but the process becomes extremely time-consuming and difficult
Solution Approach 1:
The patent changes the key parameter of fibril dimensions to match the particle size range of the particulate material. By using fibrils with lengths and widths specifically sized to correspond to the 0.075mm to 0.001mm particle range, the treatment achieves rapid stabilization without the time-consuming processes conventional methods require
Solution Approach 2:
The patent creates a composite system by combining specifically dimensioned fibrillated cellulose with ultrafine-grained particulate materials. This composite approach, where the fibril dimensions are matched to particle sizes, produces synergistic effects that enable rapid stabilization and significant shear strength improvement that neither component achieves alone
2Stability of the object's composition
If clay particles are present in the particulate material, then the material has inherent plasticity, but this causes repulsion between particles and attracts water, leading to consolidation challenges
Solution Approach 1:
The patent introduces fibrillated cellulose as an intermediary substance between clay particles. These fibrils act as a bridging medium that counteracts the repulsive forces between negatively charged clay particles and reduces their water attraction, thereby improving consolidation without requiring changes to the clay particles themselves
Solution Approach 2:
The patent changes the dimensional parameters of the added stabilizer to match the particle size range. By using fibrils with specific length and width dimensions that correspond to the ultrafine-grained particle sizes, the treatment effectively interacts with and stabilizes the clay particles, overcoming their inherent plasticity and water attraction issues
3Adaptability or versatility
If a wide variety of refining processes are applied to extract cellulose fibres, then various cellulose-derived materials are produced, but the complexity of processes increases
Solution Approach 1:
The patent focuses on changing specific parameters of a single refining process - namely the consistency and intensity - to produce fibrils with the required dimensional characteristics. This targeted parameter adjustment approach avoids the need for multiple complex refining processes while still achieving the desired fibril dimensions for matching with particulate materials
Solution Approach 2:
The patent demonstrates that a single refining process, when adjusted for consistency and intensity, can produce fibrills with dimensions suitable for stabilizing ultrafine-grained particulate materials. This multi-functional application of one process reduces overall system complexity compared to using multiple specialized processes
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 process enhances shear strength by up to 80% and improves unconfined compressive strength and bearing capacity, allowing rapid stabilization even with high water content, facilitating the handling and drying of materials like fluid fine tailings and soils.
Implementation Method 1
cellulose nanofibrils acting to consolidate mineralized particulates
Implementation Method 2
The dimensions of the fibrils may in turn confer distinct rheological properties on composite products comprising the fibrils
Implementation Method 3
cellulose nanofibrils with high aspect ratios and water-holding capabilities
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Processes are provided for stabilization of particulate materials, including processes that make use of cellulose fibrils that are dimensioned to provide a degree of stabilization for particulates that include particles in a selected size range. In select embodiments, a relatively small volume of nanofibrillated cellulose provide fibres of an appropriate length to effect a significant degree of stabilization for a range of unconsolidated particulate materials that comprise mineralizations on a micron to millimetre scale.