Automated Mineral Sample Preparation Using Rapid-Setting Epoxy
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Solution Overview
Problem
Current sample preparation methods for Automated Mineralogy systems, such as QEMSCAN and MLA, are time-consuming, typically taking around 8 hours to produce representative samples, which is inadequate for rapid decision-making in the drilling industry where quick feedback on drill cutting composition is needed.
Innovation Solution
A method and apparatus using rapid-setting epoxy and automated mixing to prepare mineral samples, eliminating the need for grinding and polishing, and incorporating an integral mold for efficient sectioning, significantly reducing sample preparation time to less than an hour.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional sample preparation methods (crushing, mixing with epoxy, curing, grinding, polishing) are used, then representative samples are produced, but the preparation time is excessively long (around 8 hours)
Solution Approach 1:
The sample is mixed with uncured epoxy and cured in advance within the mold before sectioning. This preliminary curing action allows the sample to be prepared and stabilized before the actual sectioning process, eliminating the need for post-sectioning grinding and polishing to achieve a smooth surface, thereby significantly reducing total preparation time while maintaining sample representativeness
Solution Approach 2:
The invention extracts and eliminates the time-consuming grinding and polishing steps from the traditional sample preparation workflow. By using cured epoxy that provides inherent surface smoothness after sectioning, these unnecessary operations are removed, reducing preparation time from 8 hours to under 1 hour without compromising sample quality
2Loss of time
If rapid-setting epoxy is used with automated mixing, then sample preparation time is reduced to less than an hour, but the complexity of the preparation system increases
Solution Approach 1:
The system uses automated mixing and curing mechanisms that operate autonomously without requiring extensive manual intervention. The epoxy resin itself provides the curing function, and the mold design facilitates automatic sectioning, reducing the need for complex external equipment and manual operations while achieving rapid preparation
Solution Approach 2:
The invention changes the chemical parameters of the epoxy resin by using rapid-setting formulations with optimized cure rates. This parameter change allows the material to cure quickly at controlled temperatures, enabling fast sample preparation without requiring overly complex equipment, as the chemical properties of the materials do the heavy lifting
3Loss of time
If grinding and polishing steps are eliminated, then preparation time is significantly reduced, but surface smoothness may be insufficient for accurate analysis
Solution Approach 1:
The epoxy is cured before sectioning, creating a stable matrix that maintains sample integrity. This preliminary curing ensures that the sample structure is locked in place, allowing the sectioned surface to be sufficiently smooth for analysis without requiring subsequent grinding or polishing operations
Solution Approach 2:
The use of cured epoxy resin as a matrix material provides inherent surface smoothness and structural stability. The composite nature of the cured epoxy-sample mixture creates a unified structure where the epoxy fills gaps and binds particles, producing a naturally smooth surface after sectioning that eliminates the need for mechanical smoothing operations
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 approach enables the rapid production of representative samples suitable for EDS analysis, reducing preparation time by 75% and facilitating automation, while ensuring accurate and precise mineral composition analysis without the need for extensive surface smoothing.
Implementation Method 1
adding together the aliquot and the two components of a rapid-setting two-part fixing agent in a sample mold, the fixing agent rubberizing within 3 min
Implementation Method 2
allowing the fixing agent to cure to form a cured sample block within the mold
Implementation Method 3
coating the sample face with a layer of a conductive material to produce a sample for analysis... The surface is coated with a carbon film to form a conductive coating to prevent electrical charging by the electron beam
Data Source
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AI summary
Mineral samples for use in analytical instruments are created by a system that greatly reduces the sample preparation time and facilitates automation. For example, in some implementations, rather than grinding to expose the interior of mineral particles in sample plug containing mineral particles in an epoxy compound, the sample plug is sliced with a saw, which more rapidly provides in many applications a sufficiently smooth surface on the exposed particle surfaces for observation. Rather than slowly mixing a slow curing epoxy to avoid introducing bubbles into the sample plug, some implementations use a fast settle fixative and a mechanical mixture that avoid bubbles.